linux-kernel - [PATCH v4 5/6] KVM: x86/mmu: Fix wrong gfn range of tlb flushing in validate_direct

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Message-Id: <5f297c566f7d7ff2ea6da3c66d050f69ce1b8ede.1665214747.git.houwenlong.hwl@antgroup.com>
Date:   Mon, 10 Oct 2022 20:19:16 +0800
From:   "Hou Wenlong" <houwenlong.hwl@...group.com>
To:     kvm@...r.kernel.org
Cc:     David Matlack <dmatlack@...gle.com>,
        Sean Christopherson <seanjc@...gle.com>,
        Paolo Bonzini <pbonzini@...hat.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        Dave Hansen <dave.hansen@...ux.intel.com>, x86@...nel.org,
        "H. Peter Anvin" <hpa@...or.com>,
        Lan Tianyu <Tianyu.Lan@...rosoft.com>,
        linux-kernel@...r.kernel.org
Subject: [PATCH v4 5/6] KVM: x86/mmu: Fix wrong gfn range of tlb flushing in validate_direct_spte()

The spte pointing to the children SP is dropped, so the whole gfn range
covered by the children SP should be flushed. Although, Hyper-V may
treat a 1-page flush the same if the address points to a huge page, it
still would be better to use the correct size of huge page.

Fixes: c3134ce240eed ("KVM: Replace old tlb flush function with new one to flush a specified range.")
Suggested-by: Sean Christopherson <seanjc@...gle.com>
Signed-off-by: Hou Wenlong <houwenlong.hwl@...group.com>
---
 arch/x86/kvm/mmu/mmu.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/x86/kvm/mmu/mmu.c b/arch/x86/kvm/mmu/mmu.c
index 1564cb2d4297..6757c921f412 100644
--- a/arch/x86/kvm/mmu/mmu.c
+++ b/arch/x86/kvm/mmu/mmu.c
@@ -2366,7 +2366,7 @@ static void validate_direct_spte(struct kvm_vcpu *vcpu, u64 *sptep,
 			return;
 
 		drop_parent_pte(child, sptep);
-		kvm_flush_remote_tlbs_with_address(vcpu->kvm, child->gfn, 1);
+		kvm_flush_remote_tlbs_sptep(vcpu->kvm, sptep);
 	}
 }
 
-- 
2.31.1