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