linux-kernel - [PATCH] KVM: x86/mmu: Check every prev_roots in __kvm_mmu_free_obsolete

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Date:   Sun, 22 May 2022 19:09:48 -0600
From:   shaoqin.huang@...el.com
To:     pbonzini@...hat.com
Cc:     Shaoqin Huang <shaoqin.huang@...el.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>, kvm@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH] KVM: x86/mmu: Check every prev_roots in __kvm_mmu_free_obsolete_roots()

From: Shaoqin Huang <shaoqin.huang@...el.com>

Iterate every prev_roots and only zap obsoleted roots.

Signed-off-by: Shaoqin Huang <shaoqin.huang@...el.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 45e1573f8f1d..22803916a609 100644
--- a/arch/x86/kvm/mmu/mmu.c
+++ b/arch/x86/kvm/mmu/mmu.c
@@ -5168,7 +5168,7 @@ static void __kvm_mmu_free_obsolete_roots(struct kvm *kvm, struct kvm_mmu *mmu)
 		roots_to_free |= KVM_MMU_ROOT_CURRENT;
 
 	for (i = 0; i < KVM_MMU_NUM_PREV_ROOTS; i++) {
-		if (is_obsolete_root(kvm, mmu->root.hpa))
+		if (is_obsolete_root(kvm, mmu->prev_roots.hpa))
 			roots_to_free |= KVM_MMU_ROOT_PREVIOUS(i);
 	}
 
-- 
2.30.2