linux-kernel - [PATCH 1/5] KVM: x86/mmu: Fix wrong gfn range of tlb flushing in validate_direct

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Message-Id: <66dec44acfd5f4c47451c7f4be516edb8fb326a2.1656039275.git.houwenlong.hwl@antgroup.com>
Date:   Fri, 24 Jun 2022 11:36:57 +0800
From:   "Hou Wenlong" <houwenlong.hwl@...group.com>
To:     kvm@...r.kernel.org
Cc:     Paolo Bonzini <pbonzini@...hat.com>,
        Sean Christopherson <seanjc@...gle.com>,
        Vitaly Kuznetsov <vkuznets@...hat.com>,
        Wanpeng Li <wanpengli@...cent.com>,
        Jim Mattson <jmattson@...gle.com>,
        Joerg Roedel <joro@...tes.org>,
        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 1/5] 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.

Fixes: c3134ce240eed ("KVM: Replace old tlb flush function with new one to flush a specified range.")
Signed-off-by: Hou Wenlong <houwenlong.hwl@...group.com>
---
 arch/x86/kvm/mmu/mmu.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/arch/x86/kvm/mmu/mmu.c b/arch/x86/kvm/mmu/mmu.c
index 79c6a821ea0d..b8a1f5b46b9d 100644
--- a/arch/x86/kvm/mmu/mmu.c
+++ b/arch/x86/kvm/mmu/mmu.c
@@ -2333,7 +2333,8 @@ 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_with_address(vcpu->kvm, child->gfn,
+				KVM_PAGES_PER_HPAGE(child->role.level + 1));
 	}
 }
 
-- 
2.31.1