From: David Matlack <dmatlack@google.com>
To: Hou Wenlong <houwenlong.hwl@antgroup.com>
Cc: kvm@vger.kernel.org, Sean Christopherson <seanjc@google.com>,
Paolo Bonzini <pbonzini@redhat.com>,
Thomas Gleixner <tglx@linutronix.de>,
Ingo Molnar <mingo@redhat.com>, Borislav Petkov <bp@alien8.de>,
Dave Hansen <dave.hansen@linux.intel.com>,
x86@kernel.org, "H. Peter Anvin" <hpa@zytor.com>,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH v2 3/6] KVM: x86/mmu: Reduce gfn range of tlb flushing in tdp_mmu_map_handle_target_level()
Date: Wed, 7 Sep 2022 10:58:39 -0700 [thread overview]
Message-ID: <Yxjbz4tTnqMLWcU6@google.com> (raw)
In-Reply-To: <85f889ce6eb6b330d86fa74c6e84d22d98ddc2cf.1661331396.git.houwenlong.hwl@antgroup.com>
On Wed, Aug 24, 2022 at 05:29:20PM +0800, Hou Wenlong wrote:
> Since the children SP is zapped, the gfn range of tlb flushing should be
> the range covered by children SP not parent SP. Replace sp->gfn which is
> the base gfn of parent SP with iter->gfn and use the correct size of
> gfn range for children SP to reduce tlb flushing range.
>
Fixes: bb95dfb9e2df ("KVM: x86/mmu: Defer TLB flush to caller when freeing TDP MMU shadow pages")
> Signed-off-by: Hou Wenlong <houwenlong.hwl@antgroup.com>
Reviewed-by: David Matlack <dmatlack@google.com>
> ---
> arch/x86/kvm/mmu/tdp_mmu.c | 4 ++--
> 1 file changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/arch/x86/kvm/mmu/tdp_mmu.c b/arch/x86/kvm/mmu/tdp_mmu.c
> index bf2ccf9debca..08b7932122ec 100644
> --- a/arch/x86/kvm/mmu/tdp_mmu.c
> +++ b/arch/x86/kvm/mmu/tdp_mmu.c
> @@ -1071,8 +1071,8 @@ static int tdp_mmu_map_handle_target_level(struct kvm_vcpu *vcpu,
> return RET_PF_RETRY;
> else if (is_shadow_present_pte(iter->old_spte) &&
> !is_last_spte(iter->old_spte, iter->level))
> - kvm_flush_remote_tlbs_with_address(vcpu->kvm, sp->gfn,
> - KVM_PAGES_PER_HPAGE(iter->level + 1));
> + kvm_flush_remote_tlbs_with_address(vcpu->kvm, iter->gfn,
> + KVM_PAGES_PER_HPAGE(iter->level));
>
> /*
> * If the page fault was caused by a write but the page is write
> --
> 2.31.1
>
next prev parent reply other threads:[~2022-09-07 17:58 UTC|newest]
Thread overview: 25+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-08-24 9:29 [PATCH v2 0/6] KVM: x86/mmu: Fix wrong usages of range-based tlb flushing Hou Wenlong
2022-08-24 9:29 ` [PATCH v2 1/6] KVM: x86/mmu: Fix wrong gfn range of tlb flushing in validate_direct_spte() Hou Wenlong
2022-09-07 17:43 ` David Matlack
2022-09-13 12:07 ` Hou Wenlong
2022-09-15 11:47 ` Liam Ni
2022-09-16 2:49 ` Hou Wenlong
2022-09-20 18:08 ` David Matlack
2022-09-18 13:11 ` Robert Hoo
2022-09-20 18:32 ` David Matlack
2022-09-20 18:44 ` David Matlack
2022-09-27 2:54 ` Robert Hoo
2022-09-27 16:44 ` Sean Christopherson
2022-08-24 9:29 ` [PATCH v2 2/6] KVM: x86/mmu: Fix wrong gfn range of tlb flushing in kvm_set_pte_rmapp() Hou Wenlong
2022-09-07 17:50 ` David Matlack
2022-08-24 9:29 ` [PATCH v2 3/6] KVM: x86/mmu: Reduce gfn range of tlb flushing in tdp_mmu_map_handle_target_level() Hou Wenlong
2022-09-07 17:58 ` David Matlack [this message]
2022-08-24 9:29 ` [PATCH v2 4/6] KVM: x86/mmu: Fix wrong start gfn of tlb flushing with range Hou Wenlong
2022-09-07 18:25 ` David Matlack
2022-09-13 12:50 ` Hou Wenlong
2022-08-24 9:29 ` [PATCH v2 5/6] KVM: x86/mmu: Introduce helper function to do range-based flushing for given page Hou Wenlong
2022-08-24 9:29 ` [PATCH v2 6/6] KVM: x86/mmu: Use 1 as the size of gfn range for tlb flushing in FNAME(invlpg)() Hou Wenlong
2022-09-07 17:40 ` David Matlack
2022-09-13 12:58 ` Hou Wenlong
2022-09-13 13:57 ` David Matlack
2022-09-16 19:33 ` Sean Christopherson
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