Binbin Zhou [Sat, 7 Jun 2025 07:35:43 +0000 (15:35 +0800)]
mmc: sdhci-pltfm: Drop the use of sdhci_pltfm_free()
Since the devm_mmc_alloc_host() helper is already in use,
sdhci_pltfm_free() is no longer needed.
To avoid causing drivers that still use sdhci_pltfm_free() to fail to
compile, it has been temporarily set to empty. And it will be removed
when there are no longer any callers.
Binbin Zhou [Sat, 7 Jun 2025 07:33:34 +0000 (15:33 +0800)]
mmc: sdhci: Use devm_mmc_alloc_host() helper
Use new function devm_mmc_alloc_host() to simplify the code.
Although sdhci_free_host() is no longer needed, to avoid drivers that still
use this function from failing to compile, sdhci_free_host() is temporarily
set to empty. Finally, it will be removed when there are no more callers.
Yixun Lan [Fri, 23 May 2025 14:46:32 +0000 (22:46 +0800)]
mmc: sdhci-of-k1: disable HW busy detection
It doesn't make sense to enable HW busy detection in pre_select_hs400(),
while disable it later in post_select_hs400(). And the reason behind this
isn't clear. Therefore, let's disable it for now.
Luke Wang [Wed, 21 May 2025 02:55:02 +0000 (10:55 +0800)]
mmc: sdhci-esdhc-imx: optimize clock loopback selection with dummy pad support
For legacy platforms without dummy pad:
When clock <= 100MHz: Set ESDHC_MIX_CTRL_FBCLK_SEL to 0 (external clock
pad loopback) for better bus clock proximity.
When clock > 100MHz: Set ESDHC_MIX_CTRL_FBCLK_SEL to 1 (internal clock
loopback) to avoid signal reflection noise at high frequency.
For i.MX94/95 with dummy pad support:
Keep ESDHC_MIX_CTRL_FBCLK_SEL at 0 for all speed mode. Hardware
automatically substitutes clock pad loopback with dummy pad loopback
when available, eliminating signal reflections while preserving better
bus clock proximity.
i.MX reference manual specifies that internal clock loopback should be
used for SDR104/HS200/HS400 modes. Move ESDHC_MIX_CTRL_FBCLK_SEL
configuration into the timing selection function to:
1. Explicitly set internal loopback path for SDR104/HS200/HS400 modes
2. Avoid redundant bit manipulation across multiple functions
Preserve ESDHC_MIX_CTRL_FBCLK_SEL during system resume for SDIO devices
with MMC_PM_KEEP_POWER and MMC_PM_WAKE_SDIO_IRQ flag, as the controller
might lose register state during suspend while skipping card
re-initialization.
Haibo Chen [Wed, 21 May 2025 03:31:34 +0000 (11:31 +0800)]
mmc: sdhci-esdhc-imx: Don't change pinctrl in suspend if wakeup source
The pinctrl sleep state may config the pin mux to certain function to save
power in system suspend. Unfortunately this doesn't work if usdhc is used
as a wakeup source, like waking up on SDIO irqs or card-detect irqs. In
these cases, we need pin mux to be configured to usdhc function pad.
The issue is found on imx93-11x11-evk board, where WiFI over SDIO with
in-band irqs fails to wakeup the system, because the DATA[1] pin has been
set to GPIO function.
To fix the problem, don't change the pinctrl state in suspend if there is a
system wakeup enabled.
Linus Torvalds [Sun, 22 Jun 2025 17:50:36 +0000 (10:50 -0700)]
Merge tag 'i2c-for-6.16-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/wsa/linux
Pull i2c fixes from Wolfram Sang:
- subsystem: convert drivers to use recent callbacks of struct
i2c_algorithm A typical after-rc1 cleanup, which I couldn't send in
time for rc2
- tegra: fix YAML conversion of device tree bindings
- k1: re-add a check which got lost during upstreaming
* tag 'i2c-for-6.16-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/wsa/linux:
i2c: k1: check for transfer error
i2c: use inclusive callbacks in struct i2c_algorithm
dt-bindings: i2c: nvidia,tegra20-i2c: Specify the required properties
Linus Torvalds [Sun, 22 Jun 2025 17:30:44 +0000 (10:30 -0700)]
Merge tag 'x86_urgent_for_v6.16_rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
Pull x86 fixes from Borislav Petkov:
- Make sure the array tracking which kernel text positions need to be
alternatives-patched doesn't get mishandled by out-of-order
modifications, leading to it overflowing and causing page faults when
patching
- Avoid an infinite loop when early code does a ranged TLB invalidation
before the broadcast TLB invalidation count of how many pages it can
flush, has been read from CPUID
- Fix a CONFIG_MODULES typo
- Disable broadcast TLB invalidation when PTI is enabled to avoid an
overflow of the bitmap tracking dynamic ASIDs which need to be
flushed when the kernel switches between the user and kernel address
space
- Handle the case of a CPU going offline and thus reporting zeroes when
reading top-level events in the resctrl code
* tag 'x86_urgent_for_v6.16_rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
x86/alternatives: Fix int3 handling failure from broken text_poke array
x86/mm: Fix early boot use of INVPLGB
x86/its: Fix an ifdef typo in its_alloc()
x86/mm: Disable INVLPGB when PTI is enabled
x86,fs/resctrl: Remove inappropriate references to cacheinfo in the resctrl subsystem
Linus Torvalds [Sun, 22 Jun 2025 17:17:51 +0000 (10:17 -0700)]
Merge tag 'irq_urgent_for_v6.16_rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
Pull irq fixes from Borislav Petkov:
- Fix missing prototypes warnings
- Properly initialize work context when allocating it
- Remove a method tracking when managed interrupts are suspended during
hotplug, in favor of the code using a IRQ disable depth tracking now,
and have interrupts get properly enabled again on restore
- Make sure multiple CPUs getting hotplugged don't cause wrong tracking
of the managed IRQ disable depth
* tag 'irq_urgent_for_v6.16_rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
irqchip/ath79-misc: Fix missing prototypes warnings
genirq/irq_sim: Initialize work context pointers properly
genirq/cpuhotplug: Restore affinity even for suspended IRQ
genirq/cpuhotplug: Rebalance managed interrupts across multi-CPU hotplug
Linus Torvalds [Sun, 22 Jun 2025 17:11:45 +0000 (10:11 -0700)]
Merge tag 'perf_urgent_for_v6.16_rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
Pull perf fixes from Borislav Petkov:
- Avoid a crash on a heterogeneous machine where not all cores support
the same hw events features
- Avoid a deadlock when throttling events
- Document the perf event states more
- Make sure a number of perf paths switching off or rescheduling events
call perf_cgroup_event_disable()
- Make sure perf does task sampling before its userspace mapping is
torn down, and not after
* tag 'perf_urgent_for_v6.16_rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
perf/x86/intel: Fix crash in icl_update_topdown_event()
perf: Fix the throttle error of some clock events
perf: Add comment to enum perf_event_state
perf/core: Fix WARN in perf_cgroup_switch()
perf: Fix dangling cgroup pointer in cpuctx
perf: Fix cgroup state vs ERROR
perf: Fix sample vs do_exit()
Linus Torvalds [Sun, 22 Jun 2025 17:09:23 +0000 (10:09 -0700)]
Merge tag 'locking_urgent_for_v6.16_rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
Pull locking fixes from Borislav Petkov:
- Make sure the switch to the global hash is requested always under a
lock so that two threads requesting that simultaneously cannot get to
inconsistent state
- Reject negative NUMA nodes earlier in the futex NUMA interface
handling code
- Selftests fixes
* tag 'locking_urgent_for_v6.16_rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
futex: Verify under the lock if hash can be replaced
futex: Handle invalid node numbers supplied by user
selftests/futex: Set the home_node in futex_numa_mpol
selftests/futex: getopt() requires int as return value.
* tag 'edac_urgent_for_v6.16_rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/ras/ras:
EDAC/igen6: Fix NULL pointer dereference
EDAC/amd64: Correct number of UMCs for family 19h models 70h-7fh
Linus Torvalds [Sun, 22 Jun 2025 16:46:11 +0000 (09:46 -0700)]
Merge tag 'v6.16-rc2-smb3-client-fixes-v2' of git://git.samba.org/sfrench/cifs-2.6
Pull smb client fixes from Steve French:
- Multichannel channel allocation fix for Kerberos mounts
- Two reconnect fixes
- Fix netfs_writepages crash with smbdirect/RDMA
- Directory caching fix
- Three minor cleanup fixes
- Log error when close cached dirs fails
* tag 'v6.16-rc2-smb3-client-fixes-v2' of git://git.samba.org/sfrench/cifs-2.6:
smb: minor fix to use SMB2_NTLMV2_SESSKEY_SIZE for auth_key size
smb: minor fix to use sizeof to initialize flags_string buffer
smb: Use loff_t for directory position in cached_dirents
smb: Log an error when close_all_cached_dirs fails
cifs: Fix prepare_write to negotiate wsize if needed
smb: client: fix max_sge overflow in smb_extract_folioq_to_rdma()
smb: client: fix first command failure during re-negotiation
cifs: Remove duplicate fattr->cf_dtype assignment from wsl_to_fattr() function
smb: fix secondary channel creation issue with kerberos by populating hostname when adding channels
Alex Elder [Mon, 16 Jun 2025 12:51:36 +0000 (07:51 -0500)]
i2c: k1: check for transfer error
If spacemit_i2c_xfer_msg() times out waiting for a message transfer to
complete, or if the hardware reports an error, it returns a negative
error code (-ETIMEDOUT, -EAGAIN, -ENXIO. or -EIO).
The sole caller of spacemit_i2c_xfer_msg() is spacemit_i2c_xfer(),
which is the i2c_algorithm->xfer callback function. It currently
does not save the value returned by spacemit_i2c_xfer_msg().
The result is that transfer errors go unreported, and a caller
has no indication anything is wrong.
When this code was out for review, the return value *was* checked
in early versions. But for some reason, that assignment got dropped
between versions 5 and 6 of the series, perhaps related to reworking
the code to merge spacemit_i2c_xfer_core() into spacemit_i2c_xfer().
Simply assigning the value returned to "ret" fixes the problem.
Fixes: 5ea558473fa31 ("i2c: spacemit: add support for SpacemiT K1 SoC") Signed-off-by: Alex Elder <elder@riscstar.com> Cc: <stable@vger.kernel.org> # v6.15+ Reviewed-by: Troy Mitchell <troymitchell988@gmail.com> Link: https://lore.kernel.org/r/20250616125137.1555453-1-elder@riscstar.com Signed-off-by: Andi Shyti <andi@smida.it> Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Linus Torvalds [Sat, 21 Jun 2025 16:20:15 +0000 (09:20 -0700)]
Merge tag 'nfsd-6.16-1' of git://git.kernel.org/pub/scm/linux/kernel/git/cel/linux
Pull nfsd fixes from Chuck Lever:
- Two fixes for commits in the nfsd-6.16 merge
- One fix for the recently-added NFSD netlink facility
- One fix for a remote SunRPC crasher
* tag 'nfsd-6.16-1' of git://git.kernel.org/pub/scm/linux/kernel/git/cel/linux:
sunrpc: handle SVC_GARBAGE during svc auth processing as auth error
nfsd: use threads array as-is in netlink interface
SUNRPC: Cleanup/fix initial rq_pages allocation
NFSD: Avoid corruption of a referring call list
Bharath SM [Thu, 19 Jun 2025 15:35:34 +0000 (21:05 +0530)]
smb: minor fix to use SMB2_NTLMV2_SESSKEY_SIZE for auth_key size
Replaced hardcoded value 16 with SMB2_NTLMV2_SESSKEY_SIZE
in the auth_key definition and memcpy call.
Reviewed-by: Paulo Alcantara (Red Hat) <pc@manguebit.org> Signed-off-by: Bharath SM <bharathsm@microsoft.com> Signed-off-by: Steve French <stfrench@microsoft.com>
Bharath SM [Thu, 19 Jun 2025 15:35:33 +0000 (21:05 +0530)]
smb: minor fix to use sizeof to initialize flags_string buffer
Replaced hardcoded length with sizeof(flags_string).
Reviewed-by: Paulo Alcantara (Red Hat) <pc@manguebit.org> Signed-off-by: Bharath SM <bharathsm@microsoft.com> Signed-off-by: Steve French <stfrench@microsoft.com>
Bharath SM [Thu, 19 Jun 2025 15:35:32 +0000 (21:05 +0530)]
smb: Use loff_t for directory position in cached_dirents
Change the pos field in struct cached_dirents from int to loff_t
to support large directory offsets. This avoids overflow and
matches kernel conventions for directory positions.
Reviewed-by: Paulo Alcantara (Red Hat) <pc@manguebit.org> Signed-off-by: Bharath SM <bharathsm@microsoft.com> Signed-off-by: Steve French <stfrench@microsoft.com>
Paul Aurich [Wed, 20 Nov 2024 16:01:54 +0000 (08:01 -0800)]
smb: Log an error when close_all_cached_dirs fails
Under low-memory conditions, close_all_cached_dirs() can't move the
dentries to a separate list to dput() them once the locks are dropped.
This will result in a "Dentry still in use" error, so add an error
message that makes it clear this is what happened:
[ 495.281119] CIFS: VFS: \\otters.example.com\share Out of memory while dropping dentries
[ 495.281595] ------------[ cut here ]------------
[ 495.281887] BUG: Dentry ffff888115531138{i=78,n=/} still in use (2) [unmount of cifs cifs]
[ 495.282391] WARNING: CPU: 1 PID: 2329 at fs/dcache.c:1536 umount_check+0xc8/0xf0
Also, bail out of looping through all tcons as soon as a single
allocation fails, since we're already in trouble, and kmalloc() attempts
for subseqeuent tcons are likely to fail just like the first one did.
Signed-off-by: Paul Aurich <paul@darkrain42.org> Acked-by: Bharath SM <bharathsm@microsoft.com> Suggested-by: Ruben Devos <rdevos@oxya.com> Cc: stable@vger.kernel.org Signed-off-by: Steve French <stfrench@microsoft.com>
David Howells [Wed, 18 Jun 2025 15:39:47 +0000 (16:39 +0100)]
cifs: Fix prepare_write to negotiate wsize if needed
Fix cifs_prepare_write() to negotiate the wsize if it is unset.
Reviewed-by: Shyam Prasad N <nspmangalore@gmail.com> Reviewed-by: Bharath SM <bharathsm@microsoft.com> Signed-off-by: David Howells <dhowells@redhat.com>
cc: Paulo Alcantara <pc@manguebit.org>
cc: netfs@lists.linux.dev
cc: linux-fsdevel@vger.kernel.org
cc: linux-cifs@vger.kernel.org Signed-off-by: Steve French <stfrench@microsoft.com>
cc: Tom Talpey <tom@talpey.com>
cc: linux-cifs@vger.kernel.org Reviewed-by: David Howells <dhowells@redhat.com> Reviewed-by: Tom Talpey <tom@talpey.com> Fixes: c45ebd636c32 ("cifs: Provide the capability to extract from ITER_FOLIOQ to RDMA SGEs") Signed-off-by: Stefan Metzmacher <metze@samba.org> Signed-off-by: Steve French <stfrench@microsoft.com>
zhangjian [Thu, 19 Jun 2025 01:18:29 +0000 (09:18 +0800)]
smb: client: fix first command failure during re-negotiation
after fabc4ed200f9, server_unresponsive add a condition to check whether client
need to reconnect depending on server->lstrp. When client failed to reconnect
for some time and abort connection, server->lstrp is updated for the last time.
In the following scene, server->lstrp is too old. This cause next command
failure in re-negotiation rather than waiting for re-negotiation done.
1. mount -t cifs -o username=Everyone,echo_internal=10 //$server_ip/export /mnt
2. ssh $server_ip "echo b > /proc/sysrq-trigger &"
3. ls /mnt
4. sleep 21s
5. ssh $server_ip "service firewalld stop"
6. ls # return EHOSTDOWN
If the interval between 5 and 6 is too small, 6 may trigger sending negotiation
request. Before backgrounding cifsd thread try to receive negotiation response
from server in cifs_readv_from_socket, server_unresponsive may trigger
cifs_reconnect which cause 6 to be failed:
ls thread
----------------
smb2_negotiate
server->tcpStatus = CifsInNegotiate
compound_send_recv
wait_for_compound_request
ls thread
----------------
cifs_sync_mid_result return EAGAIN
smb2_negotiate return EHOSTDOWN
Though server->lstrp means last server response time, it is updated in
cifs_abort_connection and cifs_get_tcp_session. We can also update server->lstrp
before switching into CifsInNegotiate state to avoid failure in 6.
Fixes: 7ccc1465465d ("smb: client: fix hang in wait_for_response() for negproto") Acked-by: Paulo Alcantara (Red Hat) <pc@manguebit.org> Acked-by: Meetakshi Setiya <msetiya@microsoft.com> Signed-off-by: zhangjian <zhangjian496@huawei.com> Signed-off-by: Steve French <stfrench@microsoft.com>
Linus Torvalds [Sat, 21 Jun 2025 15:27:12 +0000 (08:27 -0700)]
Merge tag 'acpi-6.16-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm
Pull ACPI fix from Rafael Wysocki:
"Fix a crash in ACPICA while attempting to evaluate a control method
that expects more arguments than are being passed to it, which was
exposed by a defective firmware update from a prominent OEM on
multiple systems (Rafael Wysocki)"
* tag 'acpi-6.16-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm:
ACPICA: Refuse to evaluate a method if arguments are missing
Linus Torvalds [Sat, 21 Jun 2025 15:21:10 +0000 (08:21 -0700)]
Merge tag 'pci-v6.16-fixes-1' of git://git.kernel.org/pub/scm/linux/kernel/git/pci/pci
Pull PCI fixes from Bjorn Helgaas:
- Set up runtime PM even for devices that lack a PM Capability as we
did before 4d4c10f763d7 ("PCI: Explicitly put devices into D0 when
initializing"), which broke resume in some VFIO scenarios (Mario
Limonciello)
- Ignore pciehp Presence Detect Changed events caused by DPC, even if
they occur after a Data Link Layer State Changed event, to fix a VFIO
GPU passthrough regression in v6.13 (Lukas Wunner)
* tag 'pci-v6.16-fixes-1' of git://git.kernel.org/pub/scm/linux/kernel/git/pci/pci:
PCI: pciehp: Ignore belated Presence Detect Changed caused by DPC
PCI/PM: Set up runtime PM even for devices without PCI PM
Linus Torvalds [Sat, 21 Jun 2025 14:59:45 +0000 (07:59 -0700)]
Merge tag 'perf-tools-fixes-for-v6.16-1-2025-06-20' of git://git.kernel.org/pub/scm/linux/kernel/git/perf/perf-tools
Pull perf tools fixes from Arnaldo Carvalho de Melo:
- Fix some file descriptor leaks that stand out with recent changes to
'perf list'
- Fix prctl include to fix building 'perf bench futex' hash with musl
libc
- Restrict 'perf test' uniquifying entry to machines with 'uncore_imc'
PMUs
- Document new output fields (op, cache, mem, dtlb, snoop) used with
'perf mem'
- Synchronize kernel header copies
* tag 'perf-tools-fixes-for-v6.16-1-2025-06-20' of git://git.kernel.org/pub/scm/linux/kernel/git/perf/perf-tools:
tools headers x86 cpufeatures: Sync with the kernel sources
perf bench futex: Fix prctl include in musl libc
perf test: Directory file descriptor leak
perf evsel: Missed close() when probing hybrid core PMUs
tools headers: Synchronize linux/bits.h with the kernel sources
tools arch amd ibs: Sync ibs.h with the kernel sources
tools arch x86: Sync the msr-index.h copy with the kernel sources
tools headers: Syncronize linux/build_bug.h with the kernel sources
tools headers: Update the copy of x86's mem{cpy,set}_64.S used in 'perf bench'
tools headers UAPI: Sync linux/kvm.h with the kernel sources
tools headers UAPI: Sync the drm/drm.h with the kernel sources
perf beauty: Update copy of linux/socket.h with the kernel sources
tools headers UAPI: Sync kvm header with the kernel sources
tools headers x86 svm: Sync svm headers with the kernel sources
tools headers UAPI: Sync KVM's vmx.h header with the kernel sources
tools kvm headers arm64: Update KVM header from the kernel sources
tools headers UAPI: Sync linux/prctl.h with the kernel sources to pick FUTEX knob
perf mem: Document new output fields (op, cache, mem, dtlb, snoop)
tools headers: Update the fs headers with the kernel sources
perf test: Restrict uniquifying test to machines with 'uncore_imc'
Linus Torvalds [Sat, 21 Jun 2025 05:36:48 +0000 (22:36 -0700)]
Merge tag 'mtd/fixes-for-6.16-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/mtd/linux
Pull mtd fixes from Miquel Raynal:
"The main fix that really needs to get in is the revert of the patch
adding the new mtd_master class, because it entirely fails the
partitioning if a specific Kconfig option is set. We need to think how
to handle that differently, so let's revert it as we need to get back
to the pen and paper situation again.
Otherwise the definition of some Winbond SPI NAND chips are receiving
some fixes (geometry and maximum frequency, mostly).
And finally a small memory leak gets also fixed"
* tag 'mtd/fixes-for-6.16-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/mtd/linux:
mtd: spinand: fix memory leak of ECC engine conf
mtd: spinand: winbond: Prevent unsupported frequencies on dual/quad I/O variants
mtd: spinand: winbond: Increase maximum frequency on an octal operation
mtd: spinand: winbond: Fix W35N number of planes/LUN
Revert "mtd: core: always create master device"
Currently the call_rcu() API does not check whether a callback
pointer is NULL. If NULL is passed, rcu_core() will try to invoke
it, resulting in NULL pointer dereference and a kernel crash.
To prevent this and improve debuggability, this patch adds a check
for NULL and emits a kernel stack trace to help identify a faulty
caller.
Signed-off-by: Uladzislau Rezki (Sony) <urezki@gmail.com> Reviewed-by: Joel Fernandes <joelagnelf@nvidia.com> Signed-off-by: Joel Fernandes <joelagnelf@nvidia.com>
Binbin Wu [Tue, 10 Jun 2025 02:14:21 +0000 (10:14 +0800)]
KVM: TDX: Exit to userspace for GetTdVmCallInfo
Exit to userspace for TDG.VP.VMCALL<GetTdVmCallInfo> via KVM_EXIT_TDX,
to allow userspace to provide information about the support of
TDVMCALLs when r12 is 1 for the TDVMCALLs beyond the GHCI base API.
GHCI spec defines the GHCI base TDVMCALLs: <GetTdVmCallInfo>, <MapGPA>,
<ReportFatalError>, <Instruction.CPUID>, <#VE.RequestMMIO>,
<Instruction.HLT>, <Instruction.IO>, <Instruction.RDMSR> and
<Instruction.WRMSR>. They must be supported by VMM to support TDX guests.
For GetTdVmCallInfo
- When leaf (r12) to enumerate TDVMCALL functionality is set to 0,
successful execution indicates all GHCI base TDVMCALLs listed above are
supported.
Update the KVM TDX document with the set of the GHCI base APIs.
- When leaf (r12) to enumerate TDVMCALL functionality is set to 1, it
indicates the TDX guest is querying the supported TDVMCALLs beyond
the GHCI base TDVMCALLs.
Exit to userspace to let userspace set the TDVMCALL sub-function bit(s)
accordingly to the leaf outputs. KVM could set the TDVMCALL bit(s)
supported by itself when the TDVMCALLs don't need support from userspace
after returning from userspace and before entering guest. Currently, no
such TDVMCALLs implemented, KVM just sets the values returned from
userspace.
Suggested-by: Paolo Bonzini <pbonzini@redhat.com> Signed-off-by: Binbin Wu <binbin.wu@linux.intel.com>
[Adjust userspace API. - Paolo] Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Binbin Wu [Tue, 10 Jun 2025 02:14:20 +0000 (10:14 +0800)]
KVM: TDX: Handle TDG.VP.VMCALL<GetQuote>
Handle TDVMCALL for GetQuote to generate a TD-Quote.
GetQuote is a doorbell-like interface used by TDX guests to request VMM
to generate a TD-Quote signed by a service hosting TD-Quoting Enclave
operating on the host. A TDX guest passes a TD Report (TDREPORT_STRUCT) in
a shared-memory area as parameter. Host VMM can access it and queue the
operation for a service hosting TD-Quoting enclave. When completed, the
Quote is returned via the same shared-memory area.
KVM only checks the GPA from the TDX guest has the shared-bit set and drops
the shared-bit before exiting to userspace to avoid bleeding the shared-bit
into KVM's exit ABI. KVM forwards the request to userspace VMM (e.g. QEMU)
and userspace VMM queues the operation asynchronously. KVM sets the return
code according to the 'ret' field set by userspace to notify the TDX guest
whether the request has been queued successfully or not. When the request
has been queued successfully, the TDX guest can poll the status field in
the shared-memory area to check whether the Quote generation is completed
or not. When completed, the generated Quote is returned via the same
buffer.
Add KVM_EXIT_TDX as a new exit reason to userspace. Userspace is
required to handle the KVM exit reason as the initial support for TDX,
by reentering KVM to ensure that the TDVMCALL is complete. While at it,
add a note that KVM_EXIT_HYPERCALL also requires reentry with KVM_RUN.
Signed-off-by: Binbin Wu <binbin.wu@linux.intel.com> Tested-by: Mikko Ylinen <mikko.ylinen@linux.intel.com> Acked-by: Kai Huang <kai.huang@intel.com>
[Adjust userspace API. - Paolo] Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Binbin Wu [Tue, 10 Jun 2025 02:14:19 +0000 (10:14 +0800)]
KVM: TDX: Add new TDVMCALL status code for unsupported subfuncs
Add the new TDVMCALL status code TDVMCALL_STATUS_SUBFUNC_UNSUPPORTED and
return it for unimplemented TDVMCALL subfunctions.
Returning TDVMCALL_STATUS_INVALID_OPERAND when a subfunction is not
implemented is vague because TDX guests can't tell the error is due to
the subfunction is not supported or an invalid input of the subfunction.
New GHCI spec adds TDVMCALL_STATUS_SUBFUNC_UNSUPPORTED to avoid the
ambiguity. Use it instead of TDVMCALL_STATUS_INVALID_OPERAND.
Before the change, for common guest implementations, when a TDX guest
receives TDVMCALL_STATUS_INVALID_OPERAND, it has two cases:
1. Some operand is invalid. It could change the operand to another value
retry.
2. The subfunction is not supported.
For case 1, an invalid operand usually means the guest implementation bug.
Since the TDX guest can't tell which case is, the best practice for
handling TDVMCALL_STATUS_INVALID_OPERAND is stopping calling such leaf,
treating the failure as fatal if the TDVMCALL is essential or ignoring
it if the TDVMCALL is optional.
With this change, TDVMCALL_STATUS_SUBFUNC_UNSUPPORTED could be sent to
old TDX guest that do not know about it, but it is expected that the
guest will make the same action as TDVMCALL_STATUS_INVALID_OPERAND.
Currently, no known TDX guest checks TDVMCALL_STATUS_INVALID_OPERAND
specifically; for example Linux just checks for success.
Signed-off-by: Binbin Wu <binbin.wu@linux.intel.com>
[Return it for untrapped KVM_HC_MAP_GPA_RANGE. - Paolo] Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
projects / thirdparty / kernel / stable.git / log
