5.10-stable patches

added patches:
	kvm-x86-wait-for-ipis-to-be-delivered-when-handling-hyper-v-tlb-flush-hypercall.patch
	mm-bdi-initialize-bdi_min_ratio-when-bdi-is-unregistered.patch

diff --git a/queue-5.10/kvm-x86-wait-for-ipis-to-be-delivered-when-handling-hyper-v-tlb-flush-hypercall.patch b/queue-5.10/kvm-x86-wait-for-ipis-to-be-delivered-when-handling-hyper-v-tlb-flush-hypercall.patch
new file mode 100644 (file)
index 0000000..ae5c75b
--- /dev/null
+++ b/queue-5.10/kvm-x86-wait-for-ipis-to-be-delivered-when-handling-hyper-v-tlb-flush-hypercall.patch
@@ -0,0 +1,50 @@
+From 1ebfaa11ebb5b603a3c3f54b2e84fcf1030f5a14 Mon Sep 17 00:00:00 2001
+From: Vitaly Kuznetsov <vkuznets@redhat.com>
+Date: Thu, 9 Dec 2021 11:29:37 +0100
+Subject: KVM: x86: Wait for IPIs to be delivered when handling Hyper-V TLB flush hypercall
+
+From: Vitaly Kuznetsov <vkuznets@redhat.com>
+
+commit 1ebfaa11ebb5b603a3c3f54b2e84fcf1030f5a14 upstream.
+
+Prior to commit 0baedd792713 ("KVM: x86: make Hyper-V PV TLB flush use
+tlb_flush_guest()"), kvm_hv_flush_tlb() was using 'KVM_REQ_TLB_FLUSH |
+KVM_REQUEST_NO_WAKEUP' when making a request to flush TLBs on other vCPUs
+and KVM_REQ_TLB_FLUSH is/was defined as:
+
+ (0 | KVM_REQUEST_WAIT | KVM_REQUEST_NO_WAKEUP)
+
+so KVM_REQUEST_WAIT was lost. Hyper-V TLFS, however, requires that
+"This call guarantees that by the time control returns back to the
+caller, the observable effects of all flushes on the specified virtual
+processors have occurred." and without KVM_REQUEST_WAIT there's a small
+chance that the vCPU making the TLB flush will resume running before
+all IPIs get delivered to other vCPUs and a stale mapping can get read
+there.
+
+Fix the issue by adding KVM_REQUEST_WAIT flag to KVM_REQ_TLB_FLUSH_GUEST:
+kvm_hv_flush_tlb() is the sole caller which uses it for
+kvm_make_all_cpus_request()/kvm_make_vcpus_request_mask() where
+KVM_REQUEST_WAIT makes a difference.
+
+Cc: stable@kernel.org
+Fixes: 0baedd792713 ("KVM: x86: make Hyper-V PV TLB flush use tlb_flush_guest()")
+Signed-off-by: Vitaly Kuznetsov <vkuznets@redhat.com>
+Message-Id: <20211209102937.584397-1-vkuznets@redhat.com>
+Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
+Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
+---
+ arch/x86/include/asm/kvm_host.h |    2 +-
+ 1 file changed, 1 insertion(+), 1 deletion(-)
+
+--- a/arch/x86/include/asm/kvm_host.h
++++ b/arch/x86/include/asm/kvm_host.h
+@@ -85,7 +85,7 @@
+       KVM_ARCH_REQ_FLAGS(25, KVM_REQUEST_WAIT | KVM_REQUEST_NO_WAKEUP)
+ #define KVM_REQ_TLB_FLUSH_CURRENT     KVM_ARCH_REQ(26)
+ #define KVM_REQ_TLB_FLUSH_GUEST \
+-      KVM_ARCH_REQ_FLAGS(27, KVM_REQUEST_NO_WAKEUP)
++      KVM_ARCH_REQ_FLAGS(27, KVM_REQUEST_WAIT | KVM_REQUEST_NO_WAKEUP)
+ #define KVM_REQ_APF_READY             KVM_ARCH_REQ(28)
+ #define KVM_REQ_MSR_FILTER_CHANGED    KVM_ARCH_REQ(29)
+ 

diff --git a/queue-5.10/mm-bdi-initialize-bdi_min_ratio-when-bdi-is-unregistered.patch b/queue-5.10/mm-bdi-initialize-bdi_min_ratio-when-bdi-is-unregistered.patch
new file mode 100644 (file)
index 0000000..310abf2
--- /dev/null
+++ b/queue-5.10/mm-bdi-initialize-bdi_min_ratio-when-bdi-is-unregistered.patch
@@ -0,0 +1,61 @@
+From 3c376dfafbf7a8ea0dea212d095ddd83e93280bb Mon Sep 17 00:00:00 2001
+From: Manjong Lee <mj0123.lee@samsung.com>
+Date: Fri, 10 Dec 2021 14:47:11 -0800
+Subject: mm: bdi: initialize bdi_min_ratio when bdi is unregistered
+
+From: Manjong Lee <mj0123.lee@samsung.com>
+
+commit 3c376dfafbf7a8ea0dea212d095ddd83e93280bb upstream.
+
+Initialize min_ratio if it is set during bdi unregistration.  This can
+prevent problems that may occur a when bdi is removed without resetting
+min_ratio.
+
+For example.
+1) insert external sdcard
+2) set external sdcard's min_ratio 70
+3) remove external sdcard without setting min_ratio 0
+4) insert external sdcard
+5) set external sdcard's min_ratio 70 << error occur(can't set)
+
+Because when an sdcard is removed, the present bdi_min_ratio value will
+remain.  Currently, the only way to reset bdi_min_ratio is to reboot.
+
+[akpm@linux-foundation.org: tweak comment and coding style]
+
+Link: https://lkml.kernel.org/r/20211021161942.5983-1-mj0123.lee@samsung.com
+Signed-off-by: Manjong Lee <mj0123.lee@samsung.com>
+Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>
+Cc: Changheun Lee <nanich.lee@samsung.com>
+Cc: Jens Axboe <axboe@kernel.dk>
+Cc: Christoph Hellwig <hch@infradead.org>
+Cc: Matthew Wilcox <willy@infradead.org>
+Cc: <seunghwan.hyun@samsung.com>
+Cc: <sookwan7.kim@samsung.com>
+Cc: <yt0928.kim@samsung.com>
+Cc: <junho89.kim@samsung.com>
+Cc: <jisoo2146.oh@samsung.com>
+Cc: <stable@vger.kernel.org>
+Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
+Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
+Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
+---
+ mm/backing-dev.c |    7 +++++++
+ 1 file changed, 7 insertions(+)
+
+--- a/mm/backing-dev.c
++++ b/mm/backing-dev.c
+@@ -872,6 +872,13 @@ void bdi_unregister(struct backing_dev_i
+       wb_shutdown(&bdi->wb);
+       cgwb_bdi_unregister(bdi);
+ 
++      /*
++       * If this BDI's min ratio has been set, use bdi_set_min_ratio() to
++       * update the global bdi_min_ratio.
++       */
++      if (bdi->min_ratio)
++              bdi_set_min_ratio(bdi, 0);
++
+       if (bdi->dev) {
+               bdi_debug_unregister(bdi);
+               device_unregister(bdi->dev);

diff --git a/queue-5.10/series b/queue-5.10/series
index a0ef09f53bff058f508058761a9ea0998cc2b343..eb9db4a4983ffa7283b6f82594624134b2574769 100644 (file)
--- a/queue-5.10/series
+++ b/queue-5.10/series
@@ -40,3 +40,5 @@ iavf-fix-reporting-when-setting-descriptor-count.patch
 ib-hfi1-correct-guard-on-eager-buffer-deallocation.patch
 devlink-fix-netns-refcount-leak-in-devlink_nl_cmd_reload.patch
 net-sched-fq_pie-prevent-dismantle-issue.patch
+kvm-x86-wait-for-ipis-to-be-delivered-when-handling-hyper-v-tlb-flush-hypercall.patch
+mm-bdi-initialize-bdi_min_ratio-when-bdi-is-unregistered.patch