This is a note to let you know that I've just added the patch titled
KVM: x86/mmu: Drop a redundant, broken remote TLB flush
to the 5.15-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
kvm-x86-mmu-drop-a-redundant-broken-remote-tlb-flush.patch
and it can be found in the queue-5.15 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From bc3b3c1002ea684e618ff6d8c387b1b8b319f140 Mon Sep 17 00:00:00 2001
From: Sean Christopherson <seanjc@xxxxxxxxxx>
Date: Thu, 21 Oct 2021 18:00:03 -0700
Subject: KVM: x86/mmu: Drop a redundant, broken remote TLB flush
From: Sean Christopherson <seanjc@xxxxxxxxxx>
commit bc3b3c1002ea684e618ff6d8c387b1b8b319f140 upstream.
A recent commit to fix the calls to kvm_flush_remote_tlbs_with_address()
in kvm_zap_gfn_range() inadvertantly added yet another flush instead of
fixing the existing flush. Drop the redundant flush, and fix the params
for the existing flush.
Cc: stable@xxxxxxxxxxxxxxx
Fixes: 2822da446640 ("KVM: x86/mmu: fix parameters to kvm_flush_remote_tlbs_with_address")
Cc: Maxim Levitsky <mlevitsk@xxxxxxxxxx>
Cc: Maciej S. Szmigiero <maciej.szmigiero@xxxxxxxxxx>
Signed-off-by: Sean Christopherson <seanjc@xxxxxxxxxx>
Message-Id: <20211022010005.1454978-2-seanjc@xxxxxxxxxx>
Signed-off-by: Paolo Bonzini <pbonzini@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
arch/x86/kvm/mmu/mmu.c | 6 ++----
1 file changed, 2 insertions(+), 4 deletions(-)
--- a/arch/x86/kvm/mmu/mmu.c
+++ b/arch/x86/kvm/mmu/mmu.c
@@ -5758,13 +5758,11 @@ void kvm_zap_gfn_range(struct kvm *kvm,
for (i = 0; i < KVM_ADDRESS_SPACE_NUM; i++)
flush = kvm_tdp_mmu_zap_gfn_range(kvm, i, gfn_start,
gfn_end, flush);
- if (flush)
- kvm_flush_remote_tlbs_with_address(kvm, gfn_start,
- gfn_end - gfn_start);
}
if (flush)
- kvm_flush_remote_tlbs_with_address(kvm, gfn_start, gfn_end);
+ kvm_flush_remote_tlbs_with_address(kvm, gfn_start,
+ gfn_end - gfn_start);
kvm_dec_notifier_count(kvm, gfn_start, gfn_end);
Patches currently in stable-queue which might be from seanjc@xxxxxxxxxx are
queue-5.15/x86-irq-ensure-pi-wakeup-handler-is-unregistered-before-module-unload.patch
queue-5.15/kvm-x86-mmu-drop-a-redundant-broken-remote-tlb-flush.patch
