KVM: SVM: Don't intercept IRET when injecting NMI and vNMI is enabled
When vNMI is enabled, rely entirely on hardware to correctly handle NMI
blocking, i.e. don't intercept IRET to detect when NMIs are no longer
blocked. KVM already correctly ignores svm->nmi_masked when vNMI is
enabled, so the effect of the bug is essentially an unnecessary VM-Exit.
KVM intercepts IRET for two reasons:
- To track NMI masking to be able to know at any point of time if NMI
is masked.
- To track NMI windows (to inject another NMI after the guest executes
IRET, i.e. unblocks NMIs)
When vNMI is enabled, both cases are handled by hardware:
- NMI masking state resides in int_ctl.V_NMI_BLOCKING and can be read by
KVM at will.
- Hardware automatically "injects" pending virtual NMIs when virtual NMIs
become unblocked.
However, even though pending a virtual NMI for hardware to handle is the
most common way to synthesize a guest NMI, KVM may still directly inject
an NMI via when KVM is handling two "simultaneous" NMIs (see comments in
process_nmi() for details on KVM's simultaneous NMI handling). Per AMD's
APM, hardware sets the BLOCKING flag when software directly injects an NMI
as well, i.e. KVM doesn't need to manually mark vNMIs as blocked:
If Event Injection is used to inject an NMI when NMI Virtualization is
enabled, VMRUN sets V_NMI_MASK in the guest state.
Note, it's still possible that KVM could trigger a spurious IRET VM-Exit.
When running a nested guest, KVM disables vNMI for L2 and thus will enable
IRET interception (in both vmcb01 and vmcb02) while running L2 reason. If
a nested VM-Exit happens before L2 executes IRET, KVM can end up running
L1 with vNMI enable and IRET intercepted. This is also a benign bug, and
even less likely to happen, i.e. can be safely punted to a future fix.
KVM: SVM: Explicitly require FLUSHBYASID to enable SEV support
Add a sanity check that FLUSHBYASID is available if SEV is supported in
hardware, as SEV (and beyond) guests are bound to a single ASID, i.e. KVM
can't "flush" by assigning a new, fresh ASID to the guest. If FLUSHBYASID
isn't supported for some bizarre reason, KVM would completely fail to do
TLB flushes for SEV+ guests (see pre_svm_run() and pre_sev_run()).
Advertise support for FLUSHBYASID when nested SVM is enabled, as KVM can
always emulate flushing TLB entries for a vmcb12 ASID, e.g. by running L2
with a new, fresh ASID in vmcb02. Some modern hypervisors, e.g. VMWare
Workstation 17, require FLUSHBYASID support and will refuse to run if it's
not present.
Punt on proper support, as "Honor L1's request to flush an ASID on nested
VMRUN" is one of the TODO items in the (incomplete) list of issues that
need to be addressed in order for KVM to NOT do a full TLB flush on every
nested SVM transition (see nested_svm_transition_tlb_flush()).
Reported-by: Stefan Sterz <s.sterz@proxmox.com> Closes: https://lkml.kernel.org/r/b9915c9c-4cf6-051a-2d91-44cc6380f455%40proxmox.com Reviewed-by: Maxim Levitsky <mlevitsk@redhat.com> Link: https://lore.kernel.org/r/20231018194104.1896415-3-seanjc@google.com Signed-off-by: Sean Christopherson <seanjc@google.com>
Revert "nSVM: Check for reserved encodings of TLB_CONTROL in nested VMCB"
Revert KVM's made-up consistency check on SVM's TLB control. The APM says
that unsupported encodings are reserved, but the APM doesn't state that
VMRUN checks for a supported encoding. Unless something is called out
in "Canonicalization and Consistency Checks" or listed as MBZ (Must Be
Zero), AMD behavior is typically to let software shoot itself in the foot.
Paolo Bonzini [Tue, 21 Nov 2023 16:24:08 +0000 (11:24 -0500)]
selftests/kvm: fix compilation on non-x86_64 platforms
MEM_REGION_SLOT and MEM_REGION_GPA are not really needed in
test_invalid_memory_region_flags; the VM never runs and there are no
other slots, so it is okay to use slot 0 and place it at address
zero. This fixes compilation on architectures that do not
define them.
Fixes: 5d74316466f4 ("KVM: selftests: Add a memory region subtest to validate invalid flags") Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Paolo Bonzini [Mon, 13 Nov 2023 10:58:30 +0000 (05:58 -0500)]
Merge branch 'kvm-guestmemfd' into HEAD
Introduce several new KVM uAPIs to ultimately create a guest-first memory
subsystem within KVM, a.k.a. guest_memfd. Guest-first memory allows KVM
to provide features, enhancements, and optimizations that are kludgly
or outright impossible to implement in a generic memory subsystem.
The core KVM ioctl() for guest_memfd is KVM_CREATE_GUEST_MEMFD, which
similar to the generic memfd_create(), creates an anonymous file and
returns a file descriptor that refers to it. Again like "regular"
memfd files, guest_memfd files live in RAM, have volatile storage,
and are automatically released when the last reference is dropped.
The key differences between memfd files (and every other memory subystem)
is that guest_memfd files are bound to their owning virtual machine,
cannot be mapped, read, or written by userspace, and cannot be resized.
guest_memfd files do however support PUNCH_HOLE, which can be used to
convert a guest memory area between the shared and guest-private states.
A second KVM ioctl(), KVM_SET_MEMORY_ATTRIBUTES, allows userspace to
specify attributes for a given page of guest memory. In the long term,
it will likely be extended to allow userspace to specify per-gfn RWX
protections, including allowing memory to be writable in the guest
without it also being writable in host userspace.
The immediate and driving use case for guest_memfd are Confidential
(CoCo) VMs, specifically AMD's SEV-SNP, Intel's TDX, and KVM's own pKVM.
For such use cases, being able to map memory into KVM guests without
requiring said memory to be mapped into the host is a hard requirement.
While SEV+ and TDX prevent untrusted software from reading guest private
data by encrypting guest memory, pKVM provides confidentiality and
integrity *without* relying on memory encryption. In addition, with
SEV-SNP and especially TDX, accessing guest private memory can be fatal
to the host, i.e. KVM must be prevent host userspace from accessing
guest memory irrespective of hardware behavior.
Long term, guest_memfd may be useful for use cases beyond CoCo VMs,
for example hardening userspace against unintentional accesses to guest
memory. As mentioned earlier, KVM's ABI uses userspace VMA protections to
define the allow guest protection (with an exception granted to mapping
guest memory executable), and similarly KVM currently requires the guest
mapping size to be a strict subset of the host userspace mapping size.
Decoupling the mappings sizes would allow userspace to precisely map
only what is needed and with the required permissions, without impacting
guest performance.
A guest-first memory subsystem also provides clearer line of sight to
things like a dedicated memory pool (for slice-of-hardware VMs) and
elimination of "struct page" (for offload setups where userspace _never_
needs to DMA from or into guest memory).
guest_memfd is the result of 3+ years of development and exploration;
taking on memory management responsibilities in KVM was not the first,
second, or even third choice for supporting CoCo VMs. But after many
failed attempts to avoid KVM-specific backing memory, and looking at
where things ended up, it is quite clear that of all approaches tried,
guest_memfd is the simplest, most robust, and most extensible, and the
right thing to do for KVM and the kernel at-large.
The "development cycle" for this version is going to be very short;
ideally, next week I will merge it as is in kvm/next, taking this through
the KVM tree for 6.8 immediately after the end of the merge window.
The series is still based on 6.6 (plus KVM changes for 6.7) so it
will require a small fixup for changes to get_file_rcu() introduced in
6.7 by commit 0ede61d8589c ("file: convert to SLAB_TYPESAFE_BY_RCU").
The fixup will be done as part of the merge commit, and most of the text
above will become the commit message for the merge.
Pending post-merge work includes:
- hugepage support
- looking into using the restrictedmem framework for guest memory
- introducing a testing mechanism to poison memory, possibly using
the same memory attributes introduced here
- SNP and TDX support
There are two non-KVM patches buried in the middle of this series:
fs: Rename anon_inode_getfile_secure() and anon_inode_getfd_secure()
mm: Add AS_UNMOVABLE to mark mapping as completely unmovable
The first is small and mostly suggested-by Christian Brauner; the second
a bit less so but it was written by an mm person (Vlastimil Babka).
KVM: selftests: Add a memory region subtest to validate invalid flags
Add a subtest to set_memory_region_test to verify that KVM rejects invalid
flags and combinations with -EINVAL. KVM might or might not fail with
EINVAL anyways, but we can at least try.
Signed-off-by: Sean Christopherson <seanjc@google.com>
Message-Id: <20231031002049.3915752-1-seanjc@google.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Ackerley Tng [Fri, 27 Oct 2023 18:22:17 +0000 (11:22 -0700)]
KVM: selftests: Test KVM exit behavior for private memory/access
"Testing private access when memslot gets deleted" tests the behavior
of KVM when a private memslot gets deleted while the VM is using the
private memslot. When KVM looks up the deleted (slot = NULL) memslot,
KVM should exit to userspace with KVM_EXIT_MEMORY_FAULT.
In the second test, upon a private access to non-private memslot, KVM
should also exit to userspace with KVM_EXIT_MEMORY_FAULT.
Intentionally don't take a requirement on KVM_CAP_GUEST_MEMFD,
KVM_CAP_MEMORY_FAULT_INFO, KVM_MEMORY_ATTRIBUTE_PRIVATE, etc., as it's a
KVM bug to advertise KVM_X86_SW_PROTECTED_VM without its prerequisites.
Signed-off-by: Ackerley Tng <ackerleytng@google.com>
[sean: call out the similarities with set_memory_region_test] Signed-off-by: Sean Christopherson <seanjc@google.com>
Message-Id: <20231027182217.3615211-36-seanjc@google.com> Reviewed-by: Fuad Tabba <tabba@google.com> Tested-by: Fuad Tabba <tabba@google.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Chao Peng [Fri, 27 Oct 2023 18:22:16 +0000 (11:22 -0700)]
KVM: selftests: Add basic selftest for guest_memfd()
Add a selftest to verify the basic functionality of guest_memfd():
+ file descriptor created with the guest_memfd() ioctl does not allow
read/write/mmap operations
+ file size and block size as returned from fstat are as expected
+ fallocate on the fd checks that offset/length on
fallocate(FALLOC_FL_PUNCH_HOLE) should be page aligned
+ invalid inputs (misaligned size, invalid flags) are rejected
+ file size and inode are unique (the innocuous-sounding
anon_inode_getfile() backs all files with a single inode...)
Signed-off-by: Chao Peng <chao.p.peng@linux.intel.com> Co-developed-by: Ackerley Tng <ackerleytng@google.com> Signed-off-by: Ackerley Tng <ackerleytng@google.com> Co-developed-by: Paolo Bonzini <pbonzini@redhat.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> Co-developed-by: Sean Christopherson <seanjc@google.com> Signed-off-by: Sean Christopherson <seanjc@google.com>
Message-Id: <20231027182217.3615211-35-seanjc@google.com> Reviewed-by: Fuad Tabba <tabba@google.com> Tested-by: Fuad Tabba <tabba@google.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Add helpers to invoke KVM_SET_USER_MEMORY_REGION2 directly so that tests
can validate of features that are unique to "version 2" of "set user
memory region", e.g. do negative testing on gmem_fd and gmem_offset.
Provide a raw version as well as an assert-success version to reduce
the amount of boilerplate code need for basic usage.
Vishal Annapurve [Fri, 27 Oct 2023 18:22:13 +0000 (11:22 -0700)]
KVM: selftests: Add x86-only selftest for private memory conversions
Add a selftest to exercise implicit/explicit conversion functionality
within KVM and verify:
- Shared memory is visible to host userspace
- Private memory is not visible to host userspace
- Host userspace and guest can communicate over shared memory
- Data in shared backing is preserved across conversions (test's
host userspace doesn't free the data)
- Private memory is bound to the lifetime of the VM
Ideally, KVM's selftests infrastructure would be reworked to allow backing
a single region of guest memory with multiple memslots for _all_ backing
types and shapes, i.e. ideally the code for using a single backing fd
across multiple memslots would work for "regular" memory as well. But
sadly, support for KVM_CREATE_GUEST_MEMFD has languished for far too long,
and overhauling selftests' memslots infrastructure would likely open a can
of worms, i.e. delay things even further.
In addition to the more obvious tests, verify that PUNCH_HOLE actually
frees memory. Directly verifying that KVM frees memory is impractical, if
it's even possible, so instead indirectly verify memory is freed by
asserting that the guest reads zeroes after a PUNCH_HOLE. E.g. if KVM
zaps SPTEs but doesn't actually punch a hole in the inode, the subsequent
read will still see the previous value. And obviously punching a hole
shouldn't cause explosions.
Let the user specify the number of memslots in the private mem conversion
test, i.e. don't require the number of memslots to be '1' or "nr_vcpus".
Creating more memslots than vCPUs is particularly interesting, e.g. it can
result in a single KVM_SET_MEMORY_ATTRIBUTES spanning multiple memslots.
To keep the math reasonable, align each vCPU's chunk to at least 2MiB (the
size is 2MiB+4KiB), and require the total size to be cleanly divisible by
the number of memslots. The goal is to be able to validate that KVM plays
nice with multiple memslots, being able to create a truly arbitrary number
of memslots doesn't add meaningful value, i.e. isn't worth the cost.
Intentionally don't take a requirement on KVM_CAP_GUEST_MEMFD,
KVM_CAP_MEMORY_FAULT_INFO, KVM_MEMORY_ATTRIBUTE_PRIVATE, etc., as it's a
KVM bug to advertise KVM_X86_SW_PROTECTED_VM without its prerequisites.
Signed-off-by: Vishal Annapurve <vannapurve@google.com> Co-developed-by: Ackerley Tng <ackerleytng@google.com> Signed-off-by: Ackerley Tng <ackerleytng@google.com> Co-developed-by: Sean Christopherson <seanjc@google.com> Signed-off-by: Sean Christopherson <seanjc@google.com>
Message-Id: <20231027182217.3615211-32-seanjc@google.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
KVM: selftests: Introduce VM "shape" to allow tests to specify the VM type
Add a "vm_shape" structure to encapsulate the selftests-defined "mode",
along with the KVM-defined "type" for use when creating a new VM. "mode"
tracks physical and virtual address properties, as well as the preferred
backing memory type, while "type" corresponds to the VM type.
Taking the VM type will allow adding tests for KVM_CREATE_GUEST_MEMFD
without needing an entirely separate set of helpers. At this time,
guest_memfd is effectively usable only by confidential VM types in the
form of guest private memory, and it's expected that x86 will double down
and require unique VM types for TDX and SNP guests.
Signed-off-by: Sean Christopherson <seanjc@google.com>
Message-Id: <20231027182217.3615211-30-seanjc@google.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Vishal Annapurve [Fri, 27 Oct 2023 18:22:10 +0000 (11:22 -0700)]
KVM: selftests: Add helpers to do KVM_HC_MAP_GPA_RANGE hypercalls (x86)
Add helpers for x86 guests to invoke the KVM_HC_MAP_GPA_RANGE hypercall,
which KVM will forward to userspace and thus can be used by tests to
coordinate private<=>shared conversions between host userspace code and
guest code.
Signed-off-by: Vishal Annapurve <vannapurve@google.com>
[sean: drop shared/private helpers (let tests specify flags)] Signed-off-by: Sean Christopherson <seanjc@google.com>
Message-Id: <20231027182217.3615211-29-seanjc@google.com> Reviewed-by: Fuad Tabba <tabba@google.com> Tested-by: Fuad Tabba <tabba@google.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Vishal Annapurve [Fri, 27 Oct 2023 18:22:09 +0000 (11:22 -0700)]
KVM: selftests: Add helpers to convert guest memory b/w private and shared
Add helpers to convert memory between private and shared via KVM's
memory attributes, as well as helpers to free/allocate guest_memfd memory
via fallocate(). Userspace, i.e. tests, is NOT required to do fallocate()
when converting memory, as the attributes are the single source of truth.
Provide allocate() helpers so that tests can mimic a userspace that frees
private memory on conversion, e.g. to prioritize memory usage over
performance.
Signed-off-by: Vishal Annapurve <vannapurve@google.com> Co-developed-by: Sean Christopherson <seanjc@google.com> Signed-off-by: Sean Christopherson <seanjc@google.com>
Message-Id: <20231027182217.3615211-28-seanjc@google.com> Reviewed-by: Fuad Tabba <tabba@google.com> Tested-by: Fuad Tabba <tabba@google.com Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
KVM: selftests: Add support for creating private memslots
Add support for creating "private" memslots via KVM_CREATE_GUEST_MEMFD and
KVM_SET_USER_MEMORY_REGION2. Make vm_userspace_mem_region_add() a wrapper
to its effective replacement, vm_mem_add(), so that private memslots are
fully opt-in, i.e. don't require update all tests that add memory regions.
Pivot on the KVM_MEM_PRIVATE flag instead of the validity of the "gmem"
file descriptor so that simple tests can let vm_mem_add() do the heavy
lifting of creating the guest memfd, but also allow the caller to pass in
an explicit fd+offset so that fancier tests can do things like back
multiple memslots with a single file. If the caller passes in a fd, dup()
the fd so that (a) __vm_mem_region_delete() can close the fd associated
with the memory region without needing yet another flag, and (b) so that
the caller can safely close its copy of the fd without having to first
destroy memslots.
KVM: selftests: Convert lib's mem regions to KVM_SET_USER_MEMORY_REGION2
Use KVM_SET_USER_MEMORY_REGION2 throughout KVM's selftests library so that
support for guest private memory can be added without needing an entirely
separate set of helpers.
Note, this obviously makes selftests backwards-incompatible with older KVM
versions from this point forward.
Signed-off-by: Sean Christopherson <seanjc@google.com>
Message-Id: <20231027182217.3615211-26-seanjc@google.com> Reviewed-by: Fuad Tabba <tabba@google.com> Tested-by: Fuad Tabba <tabba@google.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
KVM: selftests: Drop unused kvm_userspace_memory_region_find() helper
Drop kvm_userspace_memory_region_find(), it's unused and a terrible API
(probably why it's unused). If anything outside of kvm_util.c needs to
get at the memslot, userspace_mem_region_find() can be exposed to give
others full access to all memory region/slot information.
Signed-off-by: Sean Christopherson <seanjc@google.com>
Message-Id: <20231027182217.3615211-25-seanjc@google.com> Reviewed-by: Fuad Tabba <tabba@google.com> Tested-by: Fuad Tabba <tabba@google.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
KVM: x86: Add support for "protected VMs" that can utilize private memory
Add a new x86 VM type, KVM_X86_SW_PROTECTED_VM, to serve as a development
and testing vehicle for Confidential (CoCo) VMs, and potentially to even
become a "real" product in the distant future, e.g. a la pKVM.
The private memory support in KVM x86 is aimed at AMD's SEV-SNP and
Intel's TDX, but those technologies are extremely complex (understatement),
difficult to debug, don't support running as nested guests, and require
hardware that's isn't universally accessible. I.e. relying SEV-SNP or TDX
for maintaining guest private memory isn't a realistic option.
At the very least, KVM_X86_SW_PROTECTED_VM will enable a variety of
selftests for guest_memfd and private memory support without requiring
unique hardware.
Signed-off-by: Sean Christopherson <seanjc@google.com> Reviewed-by: Paolo Bonzini <pbonzini@redhat.com>
Message-Id: <20231027182217.3615211-24-seanjc@google.com> Reviewed-by: Fuad Tabba <tabba@google.com> Tested-by: Fuad Tabba <tabba@google.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
KVM: Allow arch code to track number of memslot address spaces per VM
Let x86 track the number of address spaces on a per-VM basis so that KVM
can disallow SMM memslots for confidential VMs. Confidentials VMs are
fundamentally incompatible with emulating SMM, which as the name suggests
requires being able to read and write guest memory and register state.
Disallowing SMM will simplify support for guest private memory, as KVM
will not need to worry about tracking memory attributes for multiple
address spaces (SMM is the only "non-default" address space across all
architectures).
Signed-off-by: Sean Christopherson <seanjc@google.com> Reviewed-by: Paolo Bonzini <pbonzini@redhat.com> Reviewed-by: Fuad Tabba <tabba@google.com> Tested-by: Fuad Tabba <tabba@google.com>
Message-Id: <20231027182217.3615211-23-seanjc@google.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Chao Peng [Fri, 27 Oct 2023 18:22:02 +0000 (11:22 -0700)]
KVM: x86/mmu: Handle page fault for private memory
Add support for resolving page faults on guest private memory for VMs
that differentiate between "shared" and "private" memory. For such VMs,
KVM_MEM_GUEST_MEMFD memslots can include both fd-based private memory and
hva-based shared memory, and KVM needs to map in the "correct" variant,
i.e. KVM needs to map the gfn shared/private as appropriate based on the
current state of the gfn's KVM_MEMORY_ATTRIBUTE_PRIVATE flag.
For AMD's SEV-SNP and Intel's TDX, the guest effectively gets to request
shared vs. private via a bit in the guest page tables, i.e. what the guest
wants may conflict with the current memory attributes. To support such
"implicit" conversion requests, exit to user with KVM_EXIT_MEMORY_FAULT
to forward the request to userspace. Add a new flag for memory faults,
KVM_MEMORY_EXIT_FLAG_PRIVATE, to communicate whether the guest wants to
map memory as shared vs. private.
Like KVM_MEMORY_ATTRIBUTE_PRIVATE, use bit 3 for flagging private memory
so that KVM can use bits 0-2 for capturing RWX behavior if/when userspace
needs such information, e.g. a likely user of KVM_EXIT_MEMORY_FAULT is to
exit on missing mappings when handling guest page fault VM-Exits. In
that case, userspace will want to know RWX information in order to
correctly/precisely resolve the fault.
Note, private memory *must* be backed by guest_memfd, i.e. shared mappings
always come from the host userspace page tables, and private mappings
always come from a guest_memfd instance.
Chao Peng [Fri, 27 Oct 2023 18:22:01 +0000 (11:22 -0700)]
KVM: x86: Disallow hugepages when memory attributes are mixed
Disallow creating hugepages with mixed memory attributes, e.g. shared
versus private, as mapping a hugepage in this case would allow the guest
to access memory with the wrong attributes, e.g. overlaying private memory
with a shared hugepage.
Tracking whether or not attributes are mixed via the existing
disallow_lpage field, but use the most significant bit in 'disallow_lpage'
to indicate a hugepage has mixed attributes instead using the normal
refcounting. Whether or not attributes are mixed is binary; either they
are or they aren't. Attempting to squeeze that info into the refcount is
unnecessarily complex as it would require knowing the previous state of
the mixed count when updating attributes. Using a flag means KVM just
needs to ensure the current status is reflected in the memslots.
Signed-off-by: Chao Peng <chao.p.peng@linux.intel.com> Co-developed-by: Sean Christopherson <seanjc@google.com> Signed-off-by: Sean Christopherson <seanjc@google.com>
Message-Id: <20231027182217.3615211-20-seanjc@google.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
KVM: x86: "Reset" vcpu->run->exit_reason early in KVM_RUN
Initialize run->exit_reason to KVM_EXIT_UNKNOWN early in KVM_RUN to reduce
the probability of exiting to userspace with a stale run->exit_reason that
*appears* to be valid.
To support fd-based guest memory (guest memory without a corresponding
userspace virtual address), KVM will exit to userspace for various memory
related errors, which userspace *may* be able to resolve, instead of using
e.g. BUS_MCEERR_AR. And in the more distant future, KVM will also likely
utilize the same functionality to let userspace "intercept" and handle
memory faults when the userspace mapping is missing, i.e. when fast gup()
fails.
Because many of KVM's internal APIs related to guest memory use '0' to
indicate "success, continue on" and not "exit to userspace", reporting
memory faults/errors to userspace will set run->exit_reason and
corresponding fields in the run structure fields in conjunction with a
a non-zero, negative return code, e.g. -EFAULT or -EHWPOISON. And because
KVM already returns -EFAULT in many paths, there's a relatively high
probability that KVM could return -EFAULT without setting run->exit_reason,
in which case reporting KVM_EXIT_UNKNOWN is much better than reporting
whatever exit reason happened to be in the run structure.
Note, KVM must wait until after run->immediate_exit is serviced to
sanitize run->exit_reason as KVM's ABI is that run->exit_reason is
preserved across KVM_RUN when run->immediate_exit is true.
KVM: Add KVM_CREATE_GUEST_MEMFD ioctl() for guest-specific backing memory
Introduce an ioctl(), KVM_CREATE_GUEST_MEMFD, to allow creating file-based
memory that is tied to a specific KVM virtual machine and whose primary
purpose is to serve guest memory.
A guest-first memory subsystem allows for optimizations and enhancements
that are kludgy or outright infeasible to implement/support in a generic
memory subsystem. With guest_memfd, guest protections and mapping sizes
are fully decoupled from host userspace mappings. E.g. KVM currently
doesn't support mapping memory as writable in the guest without it also
being writable in host userspace, as KVM's ABI uses VMA protections to
define the allow guest protection. Userspace can fudge this by
establishing two mappings, a writable mapping for the guest and readable
one for itself, but that’s suboptimal on multiple fronts.
Similarly, KVM currently requires the guest mapping size to be a strict
subset of the host userspace mapping size, e.g. KVM doesn’t support
creating a 1GiB guest mapping unless userspace also has a 1GiB guest
mapping. Decoupling the mappings sizes would allow userspace to precisely
map only what is needed without impacting guest performance, e.g. to
harden against unintentional accesses to guest memory.
Decoupling guest and userspace mappings may also allow for a cleaner
alternative to high-granularity mappings for HugeTLB, which has reached a
bit of an impasse and is unlikely to ever be merged.
A guest-first memory subsystem also provides clearer line of sight to
things like a dedicated memory pool (for slice-of-hardware VMs) and
elimination of "struct page" (for offload setups where userspace _never_
needs to mmap() guest memory).
More immediately, being able to map memory into KVM guests without mapping
said memory into the host is critical for Confidential VMs (CoCo VMs), the
initial use case for guest_memfd. While AMD's SEV and Intel's TDX prevent
untrusted software from reading guest private data by encrypting guest
memory with a key that isn't usable by the untrusted host, projects such
as Protected KVM (pKVM) provide confidentiality and integrity *without*
relying on memory encryption. And with SEV-SNP and TDX, accessing guest
private memory can be fatal to the host, i.e. KVM must be prevent host
userspace from accessing guest memory irrespective of hardware behavior.
Attempt #1 to support CoCo VMs was to add a VMA flag to mark memory as
being mappable only by KVM (or a similarly enlightened kernel subsystem).
That approach was abandoned largely due to it needing to play games with
PROT_NONE to prevent userspace from accessing guest memory.
Attempt #2 to was to usurp PG_hwpoison to prevent the host from mapping
guest private memory into userspace, but that approach failed to meet
several requirements for software-based CoCo VMs, e.g. pKVM, as the kernel
wouldn't easily be able to enforce a 1:1 page:guest association, let alone
a 1:1 pfn:gfn mapping. And using PG_hwpoison does not work for memory
that isn't backed by 'struct page', e.g. if devices gain support for
exposing encrypted memory regions to guests.
Attempt #3 was to extend the memfd() syscall and wrap shmem to provide
dedicated file-based guest memory. That approach made it as far as v10
before feedback from Hugh Dickins and Christian Brauner (and others) led
to it demise.
Hugh's objection was that piggybacking shmem made no sense for KVM's use
case as KVM didn't actually *want* the features provided by shmem. I.e.
KVM was using memfd() and shmem to avoid having to manage memory directly,
not because memfd() and shmem were the optimal solution, e.g. things like
read/write/mmap in shmem were dead weight.
Christian pointed out flaws with implementing a partial overlay (wrapping
only _some_ of shmem), e.g. poking at inode_operations or super_operations
would show shmem stuff, but address_space_operations and file_operations
would show KVM's overlay. Paraphrashing heavily, Christian suggested KVM
stop being lazy and create a proper API.
Paolo Bonzini [Fri, 3 Nov 2023 10:47:51 +0000 (06:47 -0400)]
fs: Rename anon_inode_getfile_secure() and anon_inode_getfd_secure()
The call to the inode_init_security_anon() LSM hook is not the sole
reason to use anon_inode_getfile_secure() or anon_inode_getfd_secure().
For example, the functions also allow one to create a file with non-zero
size, without needing a full-blown filesystem. In this case, you don't
need a "secure" version, just unique inodes; the current name of the
functions is confusing and does not explain well the difference with
the more "standard" anon_inode_getfile() and anon_inode_getfd().
Of course, there is another side of the coin; neither io_uring nor
userfaultfd strictly speaking need distinct inodes, and it is not
that clear anymore that anon_inode_create_get{file,fd}() allow the LSM
to intercept and block the inode's creation. If one was so inclined,
anon_inode_getfile_secure() and anon_inode_getfd_secure() could be kept,
using the shared inode or a new one depending on CONFIG_SECURITY.
However, this is probably overkill, and potentially a cause of bugs in
different configurations. Therefore, just add a comment to io_uring
and userfaultfd explaining the choice of the function.
While at it, remove the export for what is now anon_inode_create_getfd().
There is no in-tree module that uses it, and the old name is gone anyway.
If anybody actually needs the symbol, they can ask or they can just use
anon_inode_create_getfile(), which will be exported very soon for use
in KVM.
Suggested-by: Christian Brauner <brauner@kernel.org> Reviewed-by: Christian Brauner <brauner@kernel.org> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
mm: Add AS_UNMOVABLE to mark mapping as completely unmovable
Add an "unmovable" flag for mappings that cannot be migrated under any
circumstance. KVM will use the flag for its upcoming GUEST_MEMFD support,
which will not support compaction/migration, at least not in the
foreseeable future.
Test AS_UNMOVABLE under folio lock as already done for the async
compaction/dirty folio case, as the mapping can be removed by truncation
while compaction is running. To avoid having to lock every folio with a
mapping, assume/require that unmovable mappings are also unevictable, and
have mapping_set_unmovable() also set AS_UNEVICTABLE.
Cc: Matthew Wilcox <willy@infradead.org> Co-developed-by: Vlastimil Babka <vbabka@suse.cz> Signed-off-by: Vlastimil Babka <vbabka@suse.cz> Signed-off-by: Sean Christopherson <seanjc@google.com>
Message-Id: <20231027182217.3615211-15-seanjc@google.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Chao Peng [Fri, 27 Oct 2023 18:21:55 +0000 (11:21 -0700)]
KVM: Introduce per-page memory attributes
In confidential computing usages, whether a page is private or shared is
necessary information for KVM to perform operations like page fault
handling, page zapping etc. There are other potential use cases for
per-page memory attributes, e.g. to make memory read-only (or no-exec,
or exec-only, etc.) without having to modify memslots.
Introduce the KVM_SET_MEMORY_ATTRIBUTES ioctl, advertised by
KVM_CAP_MEMORY_ATTRIBUTES, to allow userspace to set the per-page memory
attributes to a guest memory range.
Use an xarray to store the per-page attributes internally, with a naive,
not fully optimized implementation, i.e. prioritize correctness over
performance for the initial implementation.
Use bit 3 for the PRIVATE attribute so that KVM can use bits 0-2 for RWX
attributes/protections in the future, e.g. to give userspace fine-grained
control over read, write, and execute protections for guest memory.
Provide arch hooks for handling attribute changes before and after common
code sets the new attributes, e.g. x86 will use the "pre" hook to zap all
relevant mappings, and the "post" hook to track whether or not hugepages
can be used to map the range.
To simplify the implementation wrap the entire sequence with
kvm_mmu_invalidate_{begin,end}() even though the operation isn't strictly
guaranteed to be an invalidation. For the initial use case, x86 *will*
always invalidate memory, and preventing arch code from creating new
mappings while the attributes are in flux makes it much easier to reason
about the correctness of consuming attributes.
It's possible that future usages may not require an invalidation, e.g.
if KVM ends up supporting RWX protections and userspace grants _more_
protections, but again opt for simplicity and punt optimizations to
if/when they are needed.
Suggested-by: Sean Christopherson <seanjc@google.com> Link: https://lore.kernel.org/all/Y2WB48kD0J4VGynX@google.com Cc: Fuad Tabba <tabba@google.com> Cc: Xu Yilun <yilun.xu@intel.com> Cc: Mickaël Salaün <mic@digikod.net> Signed-off-by: Chao Peng <chao.p.peng@linux.intel.com> Co-developed-by: Sean Christopherson <seanjc@google.com> Signed-off-by: Sean Christopherson <seanjc@google.com>
Message-Id: <20231027182217.3615211-14-seanjc@google.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Drop the .on_unlock() mmu_notifer hook now that it's no longer used for
notifying arch code that memory has been reclaimed. Adding .on_unlock()
and invoking it *after* dropping mmu_lock was a terrible idea, as doing so
resulted in .on_lock() and .on_unlock() having divergent and asymmetric
behavior, and set future developers up for failure, i.e. all but asked for
bugs where KVM relied on using .on_unlock() to try to run a callback while
holding mmu_lock.
Opportunistically add a lockdep assertion in kvm_mmu_invalidate_end() to
guard against future bugs of this nature.
Reported-by: Isaku Yamahata <isaku.yamahata@intel.com> Link: https://lore.kernel.org/all/20230802203119.GB2021422@ls.amr.corp.intel.com Signed-off-by: Sean Christopherson <seanjc@google.com> Reviewed-by: Paolo Bonzini <pbonzini@redhat.com> Reviewed-by: Fuad Tabba <tabba@google.com> Tested-by: Fuad Tabba <tabba@google.com>
Message-Id: <20231027182217.3615211-12-seanjc@google.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
KVM: Add a dedicated mmu_notifier flag for reclaiming freed memory
Handle AMD SEV's kvm_arch_guest_memory_reclaimed() hook by having
__kvm_handle_hva_range() return whether or not an overlapping memslot
was found, i.e. mmu_lock was acquired. Using the .on_unlock() hook
works, but kvm_arch_guest_memory_reclaimed() needs to run after dropping
mmu_lock, which makes .on_lock() and .on_unlock() asymmetrical.
Use a small struct to return the tuple of the notifier-specific return,
plus whether or not overlap was found. Because the iteration helpers are
__always_inlined, practically speaking, the struct will never actually be
returned from a function call (not to mention the size of the struct will
be two bytes in practice).
Signed-off-by: Sean Christopherson <seanjc@google.com> Reviewed-by: Paolo Bonzini <pbonzini@redhat.com> Reviewed-by: Fuad Tabba <tabba@google.com> Tested-by: Fuad Tabba <tabba@google.com>
Message-Id: <20231027182217.3615211-11-seanjc@google.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Chao Peng [Fri, 27 Oct 2023 18:21:51 +0000 (11:21 -0700)]
KVM: Add KVM_EXIT_MEMORY_FAULT exit to report faults to userspace
Add a new KVM exit type to allow userspace to handle memory faults that
KVM cannot resolve, but that userspace *may* be able to handle (without
terminating the guest).
KVM will initially use KVM_EXIT_MEMORY_FAULT to report implicit
conversions between private and shared memory. With guest private memory,
there will be two kind of memory conversions:
- explicit conversion: happens when the guest explicitly calls into KVM
to map a range (as private or shared)
- implicit conversion: happens when the guest attempts to access a gfn
that is configured in the "wrong" state (private vs. shared)
On x86 (first architecture to support guest private memory), explicit
conversions will be reported via KVM_EXIT_HYPERCALL+KVM_HC_MAP_GPA_RANGE,
but reporting KVM_EXIT_HYPERCALL for implicit conversions is undesriable
as there is (obviously) no hypercall, and there is no guarantee that the
guest actually intends to convert between private and shared, i.e. what
KVM thinks is an implicit conversion "request" could actually be the
result of a guest code bug.
KVM_EXIT_MEMORY_FAULT will be used to report memory faults that appear to
be implicit conversions.
Note! To allow for future possibilities where KVM reports
KVM_EXIT_MEMORY_FAULT and fills run->memory_fault on _any_ unresolved
fault, KVM returns "-EFAULT" (-1 with errno == EFAULT from userspace's
perspective), not '0'! Due to historical baggage within KVM, exiting to
userspace with '0' from deep callstacks, e.g. in emulation paths, is
infeasible as doing so would require a near-complete overhaul of KVM,
whereas KVM already propagates -errno return codes to userspace even when
the -errno originated in a low level helper.
Report the gpa+size instead of a single gfn even though the initial usage
is expected to always report single pages. It's entirely possible, likely
even, that KVM will someday support sub-page granularity faults, e.g.
Intel's sub-page protection feature allows for additional protections at
128-byte granularity.
Link: https://lore.kernel.org/all/20230908222905.1321305-5-amoorthy@google.com Link: https://lore.kernel.org/all/ZQ3AmLO2SYv3DszH@google.com Cc: Anish Moorthy <amoorthy@google.com> Cc: David Matlack <dmatlack@google.com> Suggested-by: Sean Christopherson <seanjc@google.com> Co-developed-by: Yu Zhang <yu.c.zhang@linux.intel.com> Signed-off-by: Yu Zhang <yu.c.zhang@linux.intel.com> Signed-off-by: Chao Peng <chao.p.peng@linux.intel.com> Co-developed-by: Sean Christopherson <seanjc@google.com> Signed-off-by: Sean Christopherson <seanjc@google.com> Reviewed-by: Paolo Bonzini <pbonzini@redhat.com>
Message-Id: <20231027182217.3615211-10-seanjc@google.com> Reviewed-by: Fuad Tabba <tabba@google.com> Tested-by: Fuad Tabba <tabba@google.com> Reviewed-by: Xiaoyao Li <xiaoyao.li@intel.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Introduce a "version 2" of KVM_SET_USER_MEMORY_REGION so that additional
information can be supplied without setting userspace up to fail. The
padding in the new kvm_userspace_memory_region2 structure will be used to
pass a file descriptor in addition to the userspace_addr, i.e. allow
userspace to point at a file descriptor and map memory into a guest that
is NOT mapped into host userspace.
Alternatively, KVM could simply add "struct kvm_userspace_memory_region2"
without a new ioctl(), but as Paolo pointed out, adding a new ioctl()
makes detection of bad flags a bit more robust, e.g. if the new fd field
is guarded only by a flag and not a new ioctl(), then a userspace bug
(setting a "bad" flag) would generate out-of-bounds access instead of an
-EINVAL error.
Cc: Jarkko Sakkinen <jarkko@kernel.org> Reviewed-by: Paolo Bonzini <pbonzini@redhat.com> Reviewed-by: Xiaoyao Li <xiaoyao.li@intel.com> Signed-off-by: Sean Christopherson <seanjc@google.com> Reviewed-by: Fuad Tabba <tabba@google.com> Tested-by: Fuad Tabba <tabba@google.com>
Message-Id: <20231027182217.3615211-9-seanjc@google.com> Acked-by: Kai Huang <kai.huang@intel.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
KVM: Convert KVM_ARCH_WANT_MMU_NOTIFIER to CONFIG_KVM_GENERIC_MMU_NOTIFIER
Convert KVM_ARCH_WANT_MMU_NOTIFIER into a Kconfig and select it where
appropriate to effectively maintain existing behavior. Using a proper
Kconfig will simplify building more functionality on top of KVM's
mmu_notifier infrastructure.
Add a forward declaration of kvm_gfn_range to kvm_types.h so that
including arch/powerpc/include/asm/kvm_ppc.h's with CONFIG_KVM=n doesn't
generate warnings due to kvm_gfn_range being undeclared. PPC defines
hooks for PR vs. HV without guarding them via #ifdeffery, e.g.
KVM: PPC: Return '1' unconditionally for KVM_CAP_SYNC_MMU
Advertise that KVM's MMU is synchronized with the primary MMU for all
flavors of PPC KVM support, i.e. advertise that the MMU is synchronized
when CONFIG_KVM_BOOK3S_HV_POSSIBLE=y but the VM is not using hypervisor
mode (a.k.a. PR VMs). PR VMs, via kvm_unmap_gfn_range_pr(), do the right
thing for mmu_notifier invalidation events, and more tellingly, KVM
returns '1' for KVM_CAP_SYNC_MMU when CONFIG_KVM_BOOK3S_HV_POSSIBLE=n
and CONFIG_KVM_BOOK3S_PR_POSSIBLE=y, i.e. KVM already advertises a
synchronized MMU for PR VMs, just not when CONFIG_KVM_BOOK3S_HV_POSSIBLE=y.
Suggested-by: Paolo Bonzini <pbonzini@redhat.com> Signed-off-by: Sean Christopherson <seanjc@google.com>
Message-Id: <20231027182217.3615211-7-seanjc@google.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
KVM: PPC: Drop dead code related to KVM_ARCH_WANT_MMU_NOTIFIER
Assert that both KVM_ARCH_WANT_MMU_NOTIFIER and CONFIG_MMU_NOTIFIER are
defined when KVM is enabled, and return '1' unconditionally for the
CONFIG_KVM_BOOK3S_HV_POSSIBLE=n path. All flavors of PPC support for KVM
select MMU_NOTIFIER, and KVM_ARCH_WANT_MMU_NOTIFIER is unconditionally
defined by arch/powerpc/include/asm/kvm_host.h.
Effectively dropping use of KVM_ARCH_WANT_MMU_NOTIFIER will simplify a
future cleanup to turn KVM_ARCH_WANT_MMU_NOTIFIER into a Kconfig, i.e.
will allow combining all of the
KVM: WARN if there are dangling MMU invalidations at VM destruction
Add an assertion that there are no in-progress MMU invalidations when a
VM is being destroyed, with the exception of the scenario where KVM
unregisters its MMU notifier between an .invalidate_range_start() call and
the corresponding .invalidate_range_end().
KVM can't detect unpaired calls from the mmu_notifier due to the above
exception waiver, but the assertion can detect KVM bugs, e.g. such as the
bug that *almost* escaped initial guest_memfd development.
Chao Peng [Fri, 27 Oct 2023 18:21:45 +0000 (11:21 -0700)]
KVM: Use gfn instead of hva for mmu_notifier_retry
Currently in mmu_notifier invalidate path, hva range is recorded and then
checked against by mmu_invalidate_retry_hva() in the page fault handling
path. However, for the soon-to-be-introduced private memory, a page fault
may not have a hva associated, checking gfn(gpa) makes more sense.
For existing hva based shared memory, gfn is expected to also work. The
only downside is when aliasing multiple gfns to a single hva, the
current algorithm of checking multiple ranges could result in a much
larger range being rejected. Such aliasing should be uncommon, so the
impact is expected small.
Suggested-by: Sean Christopherson <seanjc@google.com> Cc: Xu Yilun <yilun.xu@intel.com> Signed-off-by: Chao Peng <chao.p.peng@linux.intel.com> Reviewed-by: Fuad Tabba <tabba@google.com> Tested-by: Fuad Tabba <tabba@google.com>
[sean: convert vmx_set_apic_access_page_addr() to gfn-based API] Signed-off-by: Sean Christopherson <seanjc@google.com> Reviewed-by: Paolo Bonzini <pbonzini@redhat.com> Reviewed-by: Xu Yilun <yilun.xu@linux.intel.com>
Message-Id: <20231027182217.3615211-4-seanjc@google.com> Reviewed-by: Kai Huang <kai.huang@intel.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
KVM: Assert that mmu_invalidate_in_progress *never* goes negative
Move the assertion on the in-progress invalidation count from the primary
MMU's notifier path to KVM's common notification path, i.e. assert that
the count doesn't go negative even when the invalidation is coming from
KVM itself.
Opportunistically convert the assertion to a KVM_BUG_ON(), i.e. kill only
the affected VM, not the entire kernel. A corrupted count is fatal to the
VM, e.g. the non-zero (negative) count will cause mmu_invalidate_retry()
to block any and all attempts to install new mappings. But it's far from
guaranteed that an end() without a start() is fatal or even problematic to
anything other than the target VM, e.g. the underlying bug could simply be
a duplicate call to end(). And it's much more likely that a missed
invalidation, i.e. a potential use-after-free, would manifest as no
notification whatsoever, not an end() without a start().
Signed-off-by: Sean Christopherson <seanjc@google.com> Reviewed-by: Paolo Bonzini <pbonzini@redhat.com> Reviewed-by: Fuad Tabba <tabba@google.com> Tested-by: Fuad Tabba <tabba@google.com>
Message-Id: <20231027182217.3615211-3-seanjc@google.com> Reviewed-by: Kai Huang <kai.huang@intel.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
KVM: Tweak kvm_hva_range and hva_handler_t to allow reusing for gfn ranges
Rework and rename "struct kvm_hva_range" into "kvm_mmu_notifier_range" so
that the structure can be used to handle notifications that operate on gfn
context, i.e. that aren't tied to a host virtual address. Rename the
handler typedef too (arguably it should always have been gfn_handler_t).
Practically speaking, this is a nop for 64-bit kernels as the only
meaningful change is to store start+end as u64s instead of unsigned longs.
Reviewed-by: Paolo Bonzini <pbonzini@redhat.com> Reviewed-by: Xiaoyao Li <xiaoyao.li@intel.com> Signed-off-by: Sean Christopherson <seanjc@google.com> Reviewed-by: Fuad Tabba <tabba@google.com> Tested-by: Fuad Tabba <tabba@google.com>
Message-Id: <20231027182217.3615211-2-seanjc@google.com> Reviewed-by: Kai Huang <kai.huang@intel.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Miri Korenblit [Sun, 12 Nov 2023 14:36:20 +0000 (16:36 +0200)]
wifi: iwlwifi: fix system commands group ordering
The commands should be sorted inside the group definition.
Fix the ordering so we won't get following warning:
WARN_ON(iwl_cmd_groups_verify_sorted(trans_cfg))
Linus Torvalds [Sun, 12 Nov 2023 19:05:31 +0000 (11:05 -0800)]
Merge tag 'parisc-for-6.7-rc1-2' of git://git.kernel.org/pub/scm/linux/kernel/git/deller/parisc-linux
Pull parisc architecture fixes from Helge Deller:
- Include the upper 5 address bits when inserting TLB entries on a
64-bit kernel.
On physical machines those are ignored, but in qemu it's nice to have
them included and to be correct.
- Stop the 64-bit kernel and show a warning if someone tries to boot on
a machine with a 32-bit CPU
- Fix a "no previous prototype" warning in parport-gsc
* tag 'parisc-for-6.7-rc1-2' of git://git.kernel.org/pub/scm/linux/kernel/git/deller/parisc-linux:
parisc: Prevent booting 64-bit kernels on PA1.x machines
parport: gsc: mark init function static
parisc/pgtable: Do not drop upper 5 address bits of physical address
Linus Torvalds [Sun, 12 Nov 2023 18:58:08 +0000 (10:58 -0800)]
Merge tag 'loongarch-6.7' of git://git.kernel.org/pub/scm/linux/kernel/git/chenhuacai/linux-loongson
Pull LoongArch updates from Huacai Chen:
- support PREEMPT_DYNAMIC with static keys
- relax memory ordering for atomic operations
- support BPF CPU v4 instructions for LoongArch
- some build and runtime warning fixes
* tag 'loongarch-6.7' of git://git.kernel.org/pub/scm/linux/kernel/git/chenhuacai/linux-loongson:
selftests/bpf: Enable cpu v4 tests for LoongArch
LoongArch: BPF: Support signed mod instructions
LoongArch: BPF: Support signed div instructions
LoongArch: BPF: Support 32-bit offset jmp instructions
LoongArch: BPF: Support unconditional bswap instructions
LoongArch: BPF: Support sign-extension mov instructions
LoongArch: BPF: Support sign-extension load instructions
LoongArch: Add more instruction opcodes and emit_* helpers
LoongArch/smp: Call rcutree_report_cpu_starting() earlier
LoongArch: Relax memory ordering for atomic operations
LoongArch: Mark __percpu functions as always inline
LoongArch: Disable module from accessing external data directly
LoongArch: Support PREEMPT_DYNAMIC with static keys
Linus Torvalds [Sun, 12 Nov 2023 01:17:22 +0000 (17:17 -0800)]
Merge tag '6.7-rc-smb3-client-fixes-part2' of git://git.samba.org/sfrench/cifs-2.6
Pull smb client fixes from Steve French:
- ctime caching fix (for setxattr)
- encryption fix
- DNS resolver mount fix
- debugging improvements
- multichannel fixes including cases where server stops or starts
supporting multichannel after mount
- reconnect fix
- minor cleanups
* tag '6.7-rc-smb3-client-fixes-part2' of git://git.samba.org/sfrench/cifs-2.6:
cifs: update internal module version number for cifs.ko
cifs: handle when server stops supporting multichannel
cifs: handle when server starts supporting multichannel
Missing field not being returned in ioctl CIFS_IOC_GET_MNT_INFO
smb3: allow dumping session and tcon id to improve stats analysis and debugging
smb: client: fix mount when dns_resolver key is not available
smb3: fix caching of ctime on setxattr
smb3: minor cleanup of session handling code
cifs: reconnect work should have reference on server struct
cifs: do not pass cifs_sb when trying to add channels
cifs: account for primary channel in the interface list
cifs: distribute channels across interfaces based on speed
cifs: handle cases where a channel is closed
smb3: more minor cleanups for session handling routines
smb3: minor RDMA cleanup
cifs: Fix encryption of cleared, but unset rq_iter data buffers
Linus Torvalds [Sat, 11 Nov 2023 00:35:04 +0000 (16:35 -0800)]
Merge tag 'probes-fixes-v6.7-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/trace/linux-trace
Pull probes fixes from Masami Hiramatsu:
- Documentation update: Add a note about argument and return value
fetching is the best effort because it depends on the type.
- objpool: Fix to make internal global variables static in
test_objpool.c.
- kprobes: Unify kprobes_exceptions_nofify() prototypes. There are the
same prototypes in asm/kprobes.h for some architectures, but some of
them are missing the prototype and it causes a warning. So move the
prototype into linux/kprobes.h.
- tracing: Fix to check the tracepoint event and return event at
parsing stage. The tracepoint event doesn't support %return but if
$retval exists, it will be converted to %return silently. This finds
that case and rejects it.
- tracing: Fix the order of the descriptions about the parameters of
__kprobe_event_gen_cmd_start() to be consistent with the argument
list of the function.
* tag 'probes-fixes-v6.7-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/trace/linux-trace:
tracing/kprobes: Fix the order of argument descriptions
tracing: fprobe-event: Fix to check tracepoint event and return
kprobes: unify kprobes_exceptions_nofify() prototypes
lib: test_objpool: make global variables static
Documentation: tracing: Add a note about argument and retval access
Linus Torvalds [Fri, 10 Nov 2023 23:07:01 +0000 (15:07 -0800)]
Merge tag 'fbdev-for-6.7-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/deller/linux-fbdev
Pull fbdev fixes and cleanups from Helge Deller:
- fix double free and resource leaks in imsttfb
- lots of remove callback cleanups and section mismatch fixes in
omapfb, amifb and atmel_lcdfb
- error code fix and memparse simplification in omapfb
* tag 'fbdev-for-6.7-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/deller/linux-fbdev: (31 commits)
fbdev: fsl-diu-fb: mark wr_reg_wa() static
fbdev: amifb: Convert to platform remove callback returning void
fbdev: amifb: Mark driver struct with __refdata to prevent section mismatch warning
fbdev: hyperv_fb: fix uninitialized local variable use
fbdev: omapfb/tpd12s015: Convert to platform remove callback returning void
fbdev: omapfb/tfp410: Convert to platform remove callback returning void
fbdev: omapfb/sharp-ls037v7dw01: Convert to platform remove callback returning void
fbdev: omapfb/opa362: Convert to platform remove callback returning void
fbdev: omapfb/hdmi: Convert to platform remove callback returning void
fbdev: omapfb/dvi: Convert to platform remove callback returning void
fbdev: omapfb/dsi-cm: Convert to platform remove callback returning void
fbdev: omapfb/dpi: Convert to platform remove callback returning void
fbdev: omapfb/analog-tv: Convert to platform remove callback returning void
fbdev: atmel_lcdfb: Convert to platform remove callback returning void
fbdev: omapfb/tpd12s015: Don't put .remove() in .exit.text and drop suppress_bind_attrs
fbdev: omapfb/tfp410: Don't put .remove() in .exit.text and drop suppress_bind_attrs
fbdev: omapfb/sharp-ls037v7dw01: Don't put .remove() in .exit.text and drop suppress_bind_attrs
fbdev: omapfb/opa362: Don't put .remove() in .exit.text and drop suppress_bind_attrs
fbdev: omapfb/hdmi: Don't put .remove() in .exit.text and drop suppress_bind_attrs
fbdev: omapfb/dvi: Don't put .remove() in .exit.text and drop suppress_bind_attrs
...
Linus Torvalds [Fri, 10 Nov 2023 22:59:30 +0000 (14:59 -0800)]
Merge tag 'drm-next-2023-11-10' of git://anongit.freedesktop.org/drm/drm
Pull drm fixes from Daniel Vetter:
"Dave's VPN to the big machine died, so it's on me to do fixes pr this
and next week while everyone else is at plumbers.
- big pile of amd fixes, but mostly for hw support newly added in 6.7
- i915 fixes, mostly minor things
- qxl memory leak fix
- vc4 uaf fix in mock helpers
- syncobj fix for DRM_SYNCOBJ_WAIT_FLAGS_WAIT_AVAILABLE"
* tag 'drm-next-2023-11-10' of git://anongit.freedesktop.org/drm/drm: (78 commits)
drm/amdgpu: fix error handling in amdgpu_vm_init
drm/amdgpu: Fix possible null pointer dereference
drm/amdgpu: move UVD and VCE sched entity init after sched init
drm/amdgpu: move kfd_resume before the ip late init
drm/amd: Explicitly check for GFXOFF to be enabled for s0ix
drm/amdgpu: Change WREG32_RLC to WREG32_SOC15_RLC where inst != 0 (v2)
drm/amdgpu: Use correct KIQ MEC engine for gfx9.4.3 (v5)
drm/amdgpu: add smu v13.0.6 pcs xgmi ras error query support
drm/amdgpu: fix software pci_unplug on some chips
drm/amd/display: remove duplicated argument
drm/amdgpu: correct mca debugfs dump reg list
drm/amdgpu: correct acclerator check architecutre dump
drm/amdgpu: add pcs xgmi v6.4.0 ras support
drm/amdgpu: Change extended-scope MTYPE on GC 9.4.3
drm/amdgpu: disable smu v13.0.6 mca debug mode by default
drm/amdgpu: Support multiple error query modes
drm/amdgpu: refine smu v13.0.6 mca dump driver
drm/amdgpu: Do not program PF-only regs in hdp_v4_0.c under SRIOV (v2)
drm/amdgpu: Skip PCTL0_MMHUB_DEEPSLEEP_IB write in jpegv4.0.3 under SRIOV
drm: amd: Resolve Sphinx unexpected indentation warning
...
Linus Torvalds [Fri, 10 Nov 2023 20:22:14 +0000 (12:22 -0800)]
Merge tag 'arm64-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux
Pull arm64 fixes from Catalin Marinas:
"Mostly PMU fixes and a reworking of the pseudo-NMI disabling on broken
MediaTek firmware:
- Move the MediaTek GIC quirk handling from irqchip to core. Before
the merging window commit 44bd78dd2b88 ("irqchip/gic-v3: Disable
pseudo NMIs on MediaTek devices w/ firmware issues") temporarily
addressed this issue. Fixed now at a deeper level in the arch code
- Reject events meant for other PMUs in the CoreSight PMU driver,
otherwise some of the core PMU events would disappear
- Fix the Armv8 PMUv3 driver driver to not truncate 64-bit registers,
causing some events to be invisible
- Remove duplicate declaration of __arm64_sys##name following the
patch to avoid prototype warning for syscalls
- Typos in the elf_hwcap documentation"
* tag 'arm64-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux:
arm64/syscall: Remove duplicate declaration
Revert "arm64: smp: avoid NMI IPIs with broken MediaTek FW"
arm64: Move MediaTek GIC quirk handling from irqchip to core
arm64/arm: arm_pmuv3: perf: Don't truncate 64-bit registers
perf: arm_cspmu: Reject events meant for other PMUs
Documentation/arm64: Fix typos in elf_hwcaps
Linus Torvalds [Fri, 10 Nov 2023 19:57:51 +0000 (11:57 -0800)]
Merge tag 'sound-fix-6.7-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/tiwai/sound
Pull sound fixes from Takashi Iwai:
"A collection of fixes for rc1.
The majority of changes are various ASoC driver-specific small fixes
and usual HD-audio quirks, while there are a couple of core changes: a
fix in ALSA core procfs code to avoid deadlocks at disconnection and
an ASoC core fix for DAPM clock widgets"
* tag 'sound-fix-6.7-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/tiwai/sound:
OSS: dmasound/paula: Convert to platform remove callback returning void
ALSA: hda: ASUS UM5302LA: Added quirks for cs35L41/10431A83 on i2c bus
ALSA: info: Fix potential deadlock at disconnection
ASoC: nau8540: Add self recovery to improve capture quility
ALSA: hda/realtek: Add support dual speaker for Dell
ALSA: hda: Add ASRock X670E Taichi to denylist
ALSA: hda/realtek: Add quirk for ASUS UX7602ZM
ASoC: SOF: sof-client: trivial: fix comment typo
ASoC: dapm: fix clock get name
ASoC: hdmi-codec: register hpd callback on component probe
ASoC: mediatek: mt8186_mt6366_rt1019_rt5682s: trivial: fix error messages
ASoC: da7219: Improve system suspend and resume handling
ASoC: codecs: Modify macro value error
ASoC: codecs: Modify the wrong judgment of re value
ASoC: codecs: Modify the maximum value of calib
ASoC: amd: acp: fix for i2s mode register field update
ASoC: codecs: aw88399: Fix -Wuninitialized in aw_dev_set_vcalb()
ASoC: rt712-sdca: fix speaker route missing issue
ASoC: rockchip: Fix unused rockchip_i2s_tdm_match warning for !CONFIG_OF
ASoC: ti: omap-mcbsp: Fix runtime PM underflow warnings
Linus Torvalds [Fri, 10 Nov 2023 19:44:38 +0000 (11:44 -0800)]
Merge tag 'spi-fix-v6.7-merge-window' of git://git.kernel.org/pub/scm/linux/kernel/git/broonie/spi
Pull spi fixes from Mark Brown:
"A couple of fixes that came in during the merge window: one Kconfig
dependency fix and another fix for a long standing issue where a sync
transfer races with system suspend"
* tag 'spi-fix-v6.7-merge-window' of git://git.kernel.org/pub/scm/linux/kernel/git/broonie/spi:
spi: Fix null dereference on suspend
spi: spi-zynq-qspi: add spi-mem to driver kconfig dependencies
Linus Torvalds [Fri, 10 Nov 2023 19:40:38 +0000 (11:40 -0800)]
Merge tag 'mmc-v6.7-2' of git://git.kernel.org/pub/scm/linux/kernel/git/ulfh/mmc
Pull MMC fixes from Ulf Hansson:
"MMC core:
- Fix broken cache-flush support for Micron eMMCs
- Revert 'mmc: core: Capture correct oemid-bits for eMMC cards'
MMC host:
- sdhci_am654: Fix TAP value parsing for legacy speed mode
- sdhci-pci-gli: Fix support for ASPM mode for GL9755/GL9750
- vub300: Fix an error path in probe"
* tag 'mmc-v6.7-2' of git://git.kernel.org/pub/scm/linux/kernel/git/ulfh/mmc:
mmc: sdhci-pci-gli: GL9750: Mask the replay timer timeout of AER
mmc: sdhci-pci-gli: GL9755: Mask the replay timer timeout of AER
Revert "mmc: core: Capture correct oemid-bits for eMMC cards"
mmc: vub300: fix an error code
mmc: Add quirk MMC_QUIRK_BROKEN_CACHE_FLUSH for Micron eMMC Q2J54A
mmc: sdhci_am654: fix start loop index for TAP value parsing
Linus Torvalds [Fri, 10 Nov 2023 19:34:16 +0000 (11:34 -0800)]
Merge tag 'pwm/for-6.7-rc1-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/thierry.reding/linux-pwm
Pull pwm fixes from Thierry Reding:
"This contains two very small fixes that I failed to include in the
main pull request"
* tag 'pwm/for-6.7-rc1-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/thierry.reding/linux-pwm:
pwm: Fix double shift bug
pwm: samsung: Fix a bit test in pwm_samsung_resume()
Linus Torvalds [Fri, 10 Nov 2023 19:25:58 +0000 (11:25 -0800)]
Merge tag 'io_uring-6.7-2023-11-10' of git://git.kernel.dk/linux
Pull io_uring fixes from Jens Axboe:
"Mostly just a few fixes and cleanups caused by the read multishot
support.
Outside of that, a stable fix for how a connect retry is done"
* tag 'io_uring-6.7-2023-11-10' of git://git.kernel.dk/linux:
io_uring: do not clamp read length for multishot read
io_uring: do not allow multishot read to set addr or len
io_uring: indicate if io_kbuf_recycle did recycle anything
io_uring/rw: add separate prep handler for fixed read/write
io_uring/rw: add separate prep handler for readv/writev
io_uring/net: ensure socket is marked connected on connect retry
io_uring/rw: don't attempt to allocate async data if opcode doesn't need it
- nbd use-after-free fix. May need a followup, but at least it's better
than what it was before (Li)
- Rate limit write on read-only device warnings (Yu)
* tag 'block-6.7-2023-11-10' of git://git.kernel.dk/linux:
nvme: keyring: fix conditional compilation
nvme: common: make keyring and auth separate modules
blk-core: use pr_warn_ratelimited() in bio_check_ro()
nbd: fix uaf in nbd_open
nvme: start keep-alive after admin queue setup
nvme-loop: always quiesce and cancel commands before destroying admin q
nvme-tcp: avoid open-coding nvme_tcp_teardown_admin_queue()
nvme-auth: always set valid seq_num in dhchap reply
nvme-auth: add flag for bi-directional auth
nvme-auth: auth success1 msg always includes resp
nvme: fix error-handling for io_uring nvme-passthrough
nvme: update firmware version after commit
nvme-tcp: Fix a memory leak
nvme-auth: use crypto_shash_tfm_digest()
Linus Torvalds [Fri, 10 Nov 2023 19:15:34 +0000 (11:15 -0800)]
Merge tag 'ata-6.7-rc1-2' of git://git.kernel.org/pub/scm/linux/kernel/git/dlemoal/libata
Pull ata fixes from Damien Le Moal:
- Revert a change in ata_pci_shutdown_one() to suspend disks on
shutdown as this is now done using the manage_shutdown scsi device
flag (me)
- Change the pata_falcon and pata_gayle drivers to stop using
module_platform_driver_probe(). This makes these drivers more inline
with all other drivers (allowing bind/unbind) and suppress a
compilation warning (Uwe)
- Convert the pata_falcon and pata_gayle drivers to the new
.remove_new() void-return callback. These 2 drivers are the last ones
needing this change (Uwe)
* tag 'ata-6.7-rc1-2' of git://git.kernel.org/pub/scm/linux/kernel/git/dlemoal/libata:
ata: pata_gayle: Convert to platform remove callback returning void
ata: pata_falcon: Convert to platform remove callback returning void
ata: pata_gayle: Stop using module_platform_driver_probe()
ata: pata_falcon: Stop using module_platform_driver_probe()
ata: libata-core: Fix ata_pci_shutdown_one()
Linus Torvalds [Fri, 10 Nov 2023 19:09:07 +0000 (11:09 -0800)]
Merge tag 'dma-mapping-6.7-2023-11-10' of git://git.infradead.org/users/hch/dma-mapping
Pull dma-mapping fixes from Christoph Hellwig:
- don't leave pages decrypted for DMA in encrypted memory setups linger
around on failure (Petr Tesarik)
- fix an out of bounds access in the new dynamic swiotlb code (Petr
Tesarik)
- fix dma_addressing_limited for systems with weird physical memory
layouts (Jia He)
* tag 'dma-mapping-6.7-2023-11-10' of git://git.infradead.org/users/hch/dma-mapping:
swiotlb: fix out-of-bounds TLB allocations with CONFIG_SWIOTLB_DYNAMIC
dma-mapping: fix dma_addressing_limited() if dma_range_map can't cover all system RAM
dma-mapping: move dma_addressing_limited() out of line
swiotlb: do not free decrypted pages if dynamic
Linus Torvalds [Fri, 10 Nov 2023 18:58:49 +0000 (10:58 -0800)]
Merge tag 'lsm-pr-20231109' of git://git.kernel.org/pub/scm/linux/kernel/git/pcmoore/lsm
Pull lsm updates from Paul Moore:
"We've got two small patches to correct the default return
value of two LSM hooks: security_vm_enough_memory_mm() and
security_inode_getsecctx()"
* tag 'lsm-pr-20231109' of git://git.kernel.org/pub/scm/linux/kernel/git/pcmoore/lsm:
lsm: fix default return value for inode_getsecctx
lsm: fix default return value for vm_enough_memory
Linus Torvalds [Fri, 10 Nov 2023 18:23:53 +0000 (10:23 -0800)]
Merge tag '6.7-rc-smb3-server-part2' of git://git.samba.org/ksmbd
Pull smb server fixes from Steve French:
- slab out of bounds fix in ACL handling
- fix malformed request oops
- minor doc fix
* tag '6.7-rc-smb3-server-part2' of git://git.samba.org/ksmbd:
ksmbd: handle malformed smb1 message
ksmbd: fix kernel-doc comment of ksmbd_vfs_kern_path_locked()
ksmbd: fix slab out of bounds write in smb_inherit_dacl()
Linus Torvalds [Fri, 10 Nov 2023 17:52:56 +0000 (09:52 -0800)]
Merge tag 'ceph-for-6.7-rc1' of https://github.com/ceph/ceph-client
Pull ceph updates from Ilya Dryomov:
- support for idmapped mounts in CephFS (Christian Brauner, Alexander
Mikhalitsyn).
The series was originally developed by Christian and later picked up
and brought over the finish line by Alexander, who also contributed
an enabler on the MDS side (separate owner_{u,g}id fields on the
wire).
The required exports for mnt_idmap_{get,put}() in VFS have been acked
by Christian and received no objection from Christoph.
- a churny change in CephFS logging to include cluster and client
identifiers in log and debug messages (Xiubo Li).
This would help in scenarios with dozens of CephFS mounts on the same
node which are getting increasingly common, especially in the
Kubernetes world.
* tag 'ceph-for-6.7-rc1' of https://github.com/ceph/ceph-client:
ceph: allow idmapped mounts
ceph: allow idmapped atomic_open inode op
ceph: allow idmapped set_acl inode op
ceph: allow idmapped setattr inode op
ceph: pass idmap to __ceph_setattr
ceph: allow idmapped permission inode op
ceph: allow idmapped getattr inode op
ceph: pass an idmapping to mknod/symlink/mkdir
ceph: add enable_unsafe_idmap module parameter
ceph: handle idmapped mounts in create_request_message()
ceph: stash idmapping in mdsc request
fs: export mnt_idmap_get/mnt_idmap_put
libceph, ceph: move mdsmap.h to fs/ceph
ceph: print cluster fsid and client global_id in all debug logs
ceph: rename _to_client() to _to_fs_client()
ceph: pass the mdsc to several helpers
libceph: add doutc and *_client debug macros support
Linus Torvalds [Fri, 10 Nov 2023 17:23:17 +0000 (09:23 -0800)]
Merge tag 'riscv-for-linus-6.7-mw2' of git://git.kernel.org/pub/scm/linux/kernel/git/riscv/linux
Pull more RISC-V updates from Palmer Dabbelt:
- Support for handling misaligned accesses in S-mode
- Probing for misaligned access support is now properly cached and
handled in parallel
- PTDUMP now reflects the SW reserved bits, as well as the PBMT and
NAPOT extensions
- Performance improvements for TLB flushing
- Support for many new relocations in the module loader
- Various bug fixes and cleanups
* tag 'riscv-for-linus-6.7-mw2' of git://git.kernel.org/pub/scm/linux/kernel/git/riscv/linux: (51 commits)
riscv: Optimize bitops with Zbb extension
riscv: Rearrange hwcap.h and cpufeature.h
drivers: perf: Do not broadcast to other cpus when starting a counter
drivers: perf: Check find_first_bit() return value
of: property: Add fw_devlink support for msi-parent
RISC-V: Don't fail in riscv_of_parent_hartid() for disabled HARTs
riscv: Fix set_memory_XX() and set_direct_map_XX() by splitting huge linear mappings
riscv: Don't use PGD entries for the linear mapping
RISC-V: Probe misaligned access speed in parallel
RISC-V: Remove __init on unaligned_emulation_finish()
RISC-V: Show accurate per-hart isa in /proc/cpuinfo
RISC-V: Don't rely on positional structure initialization
riscv: Add tests for riscv module loading
riscv: Add remaining module relocations
riscv: Avoid unaligned access when relocating modules
riscv: split cache ops out of dma-noncoherent.c
riscv: Improve flush_tlb_kernel_range()
riscv: Make __flush_tlb_range() loop over pte instead of flushing the whole tlb
riscv: Improve flush_tlb_range() for hugetlb pages
riscv: Improve tlb_flush()
...
Linus Torvalds [Fri, 10 Nov 2023 17:19:46 +0000 (09:19 -0800)]
Merge tag 'mips_6.7' of git://git.kernel.org/pub/scm/linux/kernel/git/mips/linux
Pull MIPS updates from Thomas Bogendoerfer:
- removed AR7 platform support
- cleanups and fixes
* tag 'mips_6.7' of git://git.kernel.org/pub/scm/linux/kernel/git/mips/linux:
MIPS: AR7: remove platform
watchdog: ar7_wdt: remove driver to prepare for platform removal
vlynq: remove bus driver
mtd: parsers: ar7: remove support
serial: 8250: remove AR7 support
arch: mips: remove ReiserFS from defconfig
MIPS: lantiq: Remove unnecessary include of <linux/of_irq.h>
MIPS: lantiq: Fix pcibios_plat_dev_init() "no previous prototype" warning
MIPS: KVM: Fix a build warning about variable set but not used
MIPS: Remove dead code in relocate_new_kernel
mips: dts: ralink: mt7621: rename to GnuBee GB-PC1 and GnuBee GB-PC2
mips: dts: ralink: mt7621: define each reset as an item
mips: dts: ingenic: Remove unneeded probe-type properties
MIPS: loongson32: Remove dma.h and nand.h
Christian König [Tue, 31 Oct 2023 14:35:27 +0000 (15:35 +0100)]
drm/amdgpu: fix error handling in amdgpu_vm_init
When clearing the root PD fails we need to properly release it again.
Signed-off-by: Christian König <christian.koenig@amd.com> Acked-by: Alex Deucher <alexander.deucher@amd.com> Signed-off-by: Alex Deucher <alexander.deucher@amd.com> Cc: stable@vger.kernel.org
Felix Kuehling [Tue, 31 Oct 2023 17:30:00 +0000 (13:30 -0400)]
drm/amdgpu: Fix possible null pointer dereference
mem = bo->tbo.resource may be NULL in amdgpu_vm_bo_update.
Fixes: 180253782038 ("drm/ttm: stop allocating dummy resources during BO creation") Signed-off-by: Felix Kuehling <Felix.Kuehling@amd.com> Reviewed-by: Christian König <christian.koenig@amd.com> Signed-off-by: Alex Deucher <alexander.deucher@amd.com> Cc: stable@vger.kernel.org
Alex Deucher [Wed, 8 Nov 2023 14:40:44 +0000 (09:40 -0500)]
drm/amdgpu: move UVD and VCE sched entity init after sched init
We need kernel scheduling entities to deal with handle clean up
if apps are not cleaned up properly. With commit 56e449603f0ac5
("drm/sched: Convert the GPU scheduler to variable number of run-queues")
the scheduler entities have to be created after scheduler init, so
change the ordering to fix this.
v2: Leave logic in UVD and VCE code
Fixes: 56e449603f0a ("drm/sched: Convert the GPU scheduler to variable number of run-queues") Reviewed-by: Christian König <christian.koenig@amd.com> Reviewed-by: Luben Tuikov <ltuikov89@gmail.com> Signed-off-by: Alex Deucher <alexander.deucher@amd.com> Cc: ltuikov89@gmail.com
Tim Huang [Thu, 19 Oct 2023 07:50:43 +0000 (15:50 +0800)]
drm/amdgpu: move kfd_resume before the ip late init
The kfd_resume needs to touch GC registers to enable the interrupts,
it needs to be done before GFXOFF is enabled to ensure that the GFX is
not off and GC registers can be touched. So move kfd_resume before the
amdgpu_device_ip_late_init which enables the CGPG/GFXOFF.
Signed-off-by: Tim Huang <Tim.Huang@amd.com> Reviewed-by: Yifan Zhang <yifan1.zhang@amd.com> Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
drm/amd: Explicitly check for GFXOFF to be enabled for s0ix
If a user has disabled GFXOFF this may cause problems for the suspend
sequence. Ensure that it is enabled in amdgpu_acpi_is_s0ix_active().
The system won't reach the deepest state but it also won't hang.
Signed-off-by: Mario Limonciello <mario.limonciello@amd.com> Reviewed-by: Alex Deucher <alexander.deucher@amd.com> Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Daniel Vetter [Fri, 10 Nov 2023 15:54:41 +0000 (16:54 +0100)]
Merge tag 'drm-misc-fixes-2023-11-08' of git://anongit.freedesktop.org/drm/drm-misc into drm-next
drm-misc-fixes for v6.7-rc1:
qxl:
- qxl memory leak fix.
syncobj:
- Fix waiting for DRM_SYNCOBJ_WAIT_FLAGS_WAIT_AVAILABLE
vc4:
- Fix UAF in mock helpers
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
From: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
[sima: Stitch together both changelogs from Maarten. Also because of
branch history this contains a few more bugfixes which are already in
v6.6, but I didn't feel like this justifies some backmerge since there
wasn't any real conflict.] Link: https://patchwork.freedesktop.org/patch/msgid/bc8598ee-d427-4616-8ebd-64107ab9a2d8@linux.intel.com
Daniel Vetter [Fri, 10 Nov 2023 15:43:44 +0000 (16:43 +0100)]
Merge tag 'drm-intel-next-fixes-2023-11-08' of git://anongit.freedesktop.org/drm/drm-intel into drm-next
drm/i915 fixes for v6.7-rc1:
- Fix null dereference when perf interface is not available
- Fix a -Wstringop-overflow warning
- Fix a -Wformat-truncation warning in intel_tc_port_init
- Flush WC GGTT only on required platforms
- Fix MTL HBR3 rate support on C10 phy and eDP
- Fix MTL notify_guc for multi-GT
- Bump GLK CDCLK frequency when driving multiple pipes
- Fix potential spectre vulnerability
Shyam Prasad N [Fri, 13 Oct 2023 11:40:09 +0000 (11:40 +0000)]
cifs: handle when server stops supporting multichannel
When a server stops supporting multichannel, we will
keep attempting reconnects to the secondary channels today.
Avoid this by freeing extra channels when negotiate
returns no multichannel support.
Signed-off-by: Shyam Prasad N <sprasad@microsoft.com> Signed-off-by: Steve French <stfrench@microsoft.com>
Steve French [Fri, 10 Nov 2023 07:24:16 +0000 (01:24 -0600)]
Missing field not being returned in ioctl CIFS_IOC_GET_MNT_INFO
The tcon_flags field was always being set to zero in the information
about the mount returned by the ioctl CIFS_IOC_GET_MNT_INFO instead
of being set to the value of the Flags field in the tree connection
structure as intended.
Reviewed-by: Shyam Prasad N <sprasad@microsoft.com> Signed-off-by: Steve French <stfrench@microsoft.com>
Helge Deller [Fri, 10 Nov 2023 15:13:15 +0000 (16:13 +0100)]
parisc: Prevent booting 64-bit kernels on PA1.x machines
Bail out early with error message when trying to boot a 64-bit kernel on
32-bit machines. This fixes the previous commit to include the check for
true 64-bit kernels as well.
Mark Hasemeyer [Tue, 7 Nov 2023 21:47:43 +0000 (14:47 -0700)]
spi: Fix null dereference on suspend
A race condition exists where a synchronous (noqueue) transfer can be
active during a system suspend. This can cause a null pointer
dereference exception to occur when the system resumes.
Example order of events leading to the exception:
1. spi_sync() calls __spi_transfer_message_noqueue() which sets
ctlr->cur_msg
2. Spi transfer begins via spi_transfer_one_message()
3. System is suspended interrupting the transfer context
4. System is resumed
6. spi_controller_resume() calls spi_start_queue() which resets cur_msg
to NULL
7. Spi transfer context resumes and spi_finalize_current_message() is
called which dereferences cur_msg (which is now NULL)
Wait for synchronous transfers to complete before suspending by
acquiring the bus mutex and setting/checking a suspend flag.
tracing: fprobe-event: Fix to check tracepoint event and return
Fix to check the tracepoint event is not valid with $retval.
The commit 08c9306fc2e3 ("tracing/fprobe-event: Assume fprobe is
a return event by $retval") introduced automatic return probe
conversion with $retval. But since tracepoint event does not
support return probe, $retval is not acceptable.
Without this fix, ftracetest, tprobe_syntax_errors.tc fails;
[22] Tracepoint probe event parser error log check [FAIL]
----
# tail 22-tprobe_syntax_errors.tc-log.mRKroL
+ ftrace_errlog_check trace_fprobe t kfree ^$retval dynamic_events
+ printf %s t kfree
+ wc -c
+ pos=8
+ printf %s t kfree ^$retval
+ tr -d ^
+ command=t kfree $retval
+ echo Test command: t kfree $retval
Test command: t kfree $retval
+ echo
----
So 't kfree $retval' should fail (tracepoint doesn't support
return probe) but passed it.
Most architectures that support kprobes declare this function in their
own asm/kprobes.h header and provide an override, but some are missing
the prototype, which causes a warning for the __weak stub implementation:
kernel/kprobes.c:1865:12: error: no previous prototype for 'kprobe_exceptions_notify' [-Werror=missing-prototypes]
1865 | int __weak kprobe_exceptions_notify(struct notifier_block *self,
Move the prototype into linux/kprobes.h so it is visible to all
the definitions.
wuqiang.matt [Fri, 10 Nov 2023 10:59:04 +0000 (19:59 +0900)]
lib: test_objpool: make global variables static
Kernel test robot reported build warnings that structures g_ot_sync_ops,
g_ot_async_ops and g_testcases should be static. These definitions are
only used in test_objpool.c, so make them static
Documentation: tracing: Add a note about argument and retval access
Add a note about the argument and return value accecss will be best
effort. Depending on the type, it will be passed via stack or a
pair of the registers, but $argN and $retval only support the
single register access.
Dan Carpenter [Wed, 25 Oct 2023 11:58:18 +0000 (14:58 +0300)]
pwm: Fix double shift bug
These enums are passed to set/test_bit(). The set/test_bit() functions
take a bit number instead of a shifted value. Passing a shifted value
is a double shift bug like doing BIT(BIT(1)). The double shift bug
doesn't cause a problem here because we are only checking 0 and 1 but
if the value was 5 or above then it can lead to a buffer overflow.
Signed-off-by: Dan Carpenter <dan.carpenter@linaro.org> Reviewed-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de> Reviewed-by: Sam Protsenko <semen.protsenko@linaro.org> Signed-off-by: Thierry Reding <thierry.reding@gmail.com>
Dan Carpenter [Wed, 25 Oct 2023 11:57:34 +0000 (14:57 +0300)]
pwm: samsung: Fix a bit test in pwm_samsung_resume()
The PWMF_REQUESTED enum is supposed to be used with test_bit() and not
used as in a bitwise AND. In this specific code the flag will never be
set so the function is effectively a no-op.
Fixes: e3fe982b2e4e ("pwm: samsung: Put per-channel data into driver data") Signed-off-by: Dan Carpenter <dan.carpenter@linaro.org> Reviewed-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de> Reviewed-by: Sam Protsenko <semen.protsenko@linaro.org> Signed-off-by: Thierry Reding <thierry.reding@gmail.com>
fbdev: amifb: Convert to platform remove callback returning void
The .remove() callback for a platform driver returns an int which makes
many driver authors wrongly assume it's possible to do error handling by
returning an error code. However the value returned is ignored (apart
from emitting a warning) and this typically results in resource leaks.
To improve here there is a quest to make the remove callback return
void. In the first step of this quest all drivers are converted to
.remove_new(), which already returns void. Eventually after all drivers
are converted, .remove_new() will be renamed to .remove().
Trivially convert this driver from always returning zero in the remove
callback to the void returning variant.
fbdev: amifb: Mark driver struct with __refdata to prevent section mismatch warning
As described in the added code comment, a reference to .exit.text is ok
for drivers registered via module_platform_driver_probe(). Make this
explicit to prevent a section mismatch warning.
Steve French [Thu, 9 Nov 2023 21:28:12 +0000 (15:28 -0600)]
smb3: allow dumping session and tcon id to improve stats analysis and debugging
When multiple mounts are to the same share from the same client it was not
possible to determine which section of /proc/fs/cifs/Stats (and DebugData)
correspond to that mount. In some recent examples this turned out to be
a significant problem when trying to analyze performance data - since
there are many cases where unless we know the tree id and session id we
can't figure out which stats (e.g. number of SMB3.1.1 requests by type,
the total time they take, which is slowest, how many fail etc.) apply to
which mount. The only existing loosely related ioctl CIFS_IOC_GET_MNT_INFO
does not return the information needed to uniquely identify which tcon
is which mount although it does return various flags and device info.
Add a cifs.ko ioctl CIFS_IOC_GET_TCON_INFO (0x800ccf0c) to return tid,
session id, tree connect count.
Cc: stable@vger.kernel.org Reviewed-by: Shyam Prasad N <sprasad@microsoft.com> Signed-off-by: Steve French <stfrench@microsoft.com>
Arnd Bergmann [Wed, 8 Nov 2023 14:58:13 +0000 (15:58 +0100)]
fbdev: hyperv_fb: fix uninitialized local variable use
When CONFIG_SYSFB is disabled, the hyperv_fb driver can now run into
undefined behavior on a gen2 VM, as indicated by this smatch warning:
drivers/video/fbdev/hyperv_fb.c:1077 hvfb_getmem() error: uninitialized symbol 'base'.
drivers/video/fbdev/hyperv_fb.c:1077 hvfb_getmem() error: uninitialized symbol 'size'.
Since there is no way to know the actual framebuffer in this configuration,
just return an allocation failure here, which should avoid the build
warning and the undefined behavior.
Reported-by: kernel test robot <lkp@intel.com> Reported-by: Dan Carpenter <dan.carpenter@linaro.org> Closes: https://lore.kernel.org/r/202311070802.YCpvehaz-lkp@intel.com/ Fixes: a07b50d80ab6 ("hyperv: avoid dependency on screen_info") Signed-off-by: Arnd Bergmann <arnd@arndb.de> Signed-off-by: Helge Deller <deller@gmx.de>
fbdev: omapfb/tpd12s015: Convert to platform remove callback returning void
The .remove() callback for a platform driver returns an int which makes
many driver authors wrongly assume it's possible to do error handling by
returning an error code. However the value returned is ignored (apart
from emitting a warning) and this typically results in resource leaks.
To improve here there is a quest to make the remove callback return
void. In the first step of this quest all drivers are converted to
.remove_new(), which already returns void. Eventually after all drivers
are converted, .remove_new() will be renamed to .remove().
Trivially convert this driver from always returning zero in the remove
callback to the void returning variant.
fbdev: omapfb/tfp410: Convert to platform remove callback returning void
The .remove() callback for a platform driver returns an int which makes
many driver authors wrongly assume it's possible to do error handling by
returning an error code. However the value returned is ignored (apart
from emitting a warning) and this typically results in resource leaks.
To improve here there is a quest to make the remove callback return
void. In the first step of this quest all drivers are converted to
.remove_new(), which already returns void. Eventually after all drivers
are converted, .remove_new() will be renamed to .remove().
Trivially convert this driver from always returning zero in the remove
callback to the void returning variant.
fbdev: omapfb/sharp-ls037v7dw01: Convert to platform remove callback returning void
The .remove() callback for a platform driver returns an int which makes
many driver authors wrongly assume it's possible to do error handling by
returning an error code. However the value returned is ignored (apart
from emitting a warning) and this typically results in resource leaks.
To improve here there is a quest to make the remove callback return
void. In the first step of this quest all drivers are converted to
.remove_new(), which already returns void. Eventually after all drivers
are converted, .remove_new() will be renamed to .remove().
Trivially convert this driver from always returning zero in the remove
callback to the void returning variant.
fbdev: omapfb/opa362: Convert to platform remove callback returning void
The .remove() callback for a platform driver returns an int which makes
many driver authors wrongly assume it's possible to do error handling by
returning an error code. However the value returned is ignored (apart
from emitting a warning) and this typically results in resource leaks.
To improve here there is a quest to make the remove callback return
void. In the first step of this quest all drivers are converted to
.remove_new(), which already returns void. Eventually after all drivers
are converted, .remove_new() will be renamed to .remove().
Trivially convert this driver from always returning zero in the remove
callback to the void returning variant.
fbdev: omapfb/hdmi: Convert to platform remove callback returning void
The .remove() callback for a platform driver returns an int which makes
many driver authors wrongly assume it's possible to do error handling by
returning an error code. However the value returned is ignored (apart
from emitting a warning) and this typically results in resource leaks.
To improve here there is a quest to make the remove callback return
void. In the first step of this quest all drivers are converted to
.remove_new(), which already returns void. Eventually after all drivers
are converted, .remove_new() will be renamed to .remove().
Trivially convert this driver from always returning zero in the remove
callback to the void returning variant.
fbdev: omapfb/dvi: Convert to platform remove callback returning void
The .remove() callback for a platform driver returns an int which makes
many driver authors wrongly assume it's possible to do error handling by
returning an error code. However the value returned is ignored (apart
from emitting a warning) and this typically results in resource leaks.
To improve here there is a quest to make the remove callback return
void. In the first step of this quest all drivers are converted to
.remove_new(), which already returns void. Eventually after all drivers
are converted, .remove_new() will be renamed to .remove().
Trivially convert this driver from always returning zero in the remove
callback to the void returning variant.
fbdev: omapfb/dsi-cm: Convert to platform remove callback returning void
The .remove() callback for a platform driver returns an int which makes
many driver authors wrongly assume it's possible to do error handling by
returning an error code. However the value returned is ignored (apart
from emitting a warning) and this typically results in resource leaks.
To improve here there is a quest to make the remove callback return
void. In the first step of this quest all drivers are converted to
.remove_new(), which already returns void. Eventually after all drivers
are converted, .remove_new() will be renamed to .remove().
Trivially convert this driver from always returning zero in the remove
callback to the void returning variant.
fbdev: omapfb/dpi: Convert to platform remove callback returning void
The .remove() callback for a platform driver returns an int which makes
many driver authors wrongly assume it's possible to do error handling by
returning an error code. However the value returned is ignored (apart
from emitting a warning) and this typically results in resource leaks.
To improve here there is a quest to make the remove callback return
void. In the first step of this quest all drivers are converted to
.remove_new(), which already returns void. Eventually after all drivers
are converted, .remove_new() will be renamed to .remove().
Trivially convert this driver from always returning zero in the remove
callback to the void returning variant.
fbdev: omapfb/analog-tv: Convert to platform remove callback returning void
The .remove() callback for a platform driver returns an int which makes
many driver authors wrongly assume it's possible to do error handling by
returning an error code. However the value returned is ignored (apart
from emitting a warning) and this typically results in resource leaks.
To improve here there is a quest to make the remove callback return
void. In the first step of this quest all drivers are converted to
.remove_new(), which already returns void. Eventually after all drivers
are converted, .remove_new() will be renamed to .remove().
Trivially convert this driver from always returning zero in the remove
callback to the void returning variant.
fbdev: atmel_lcdfb: Convert to platform remove callback returning void
The .remove() callback for a platform driver returns an int which makes
many driver authors wrongly assume it's possible to do error handling by
returning an error code. However the value returned is ignored (apart
from emitting a warning) and this typically results in resource leaks.
To improve here there is a quest to make the remove callback return
void. In the first step of this quest all drivers are converted to
.remove_new(), which already returns void. Eventually after all drivers
are converted, .remove_new() will be renamed to .remove().
Trivially convert this driver from always returning zero in the remove
callback to the void returning variant.
projects / thirdparty / kernel / stable.git / log
