linux-kernel - [PATCH 3/7] KVM: X86: Zap the invalid list after remote tlb flushing

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Message-Id: <20210824075524.3354-4-jiangshanlai@gmail.com>
Date:   Tue, 24 Aug 2021 15:55:19 +0800
From:   Lai Jiangshan <jiangshanlai@...il.com>
To:     linux-kernel@...r.kernel.org
Cc:     Paolo Bonzini <pbonzini@...hat.com>,
        Lai Jiangshan <laijs@...ux.alibaba.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>,
        x86@...nel.org, "H. Peter Anvin" <hpa@...or.com>,
        kvm@...r.kernel.org
Subject: [PATCH 3/7] KVM: X86: Zap the invalid list after remote tlb flushing

From: Lai Jiangshan <laijs@...ux.alibaba.com>

In mmu_sync_children(), it can zap the invalid list after remote tlb flushing.
Emptifying the invalid list ASAP might help reduce a remote tlb flushing
in some cases.

Signed-off-by: Lai Jiangshan <laijs@...ux.alibaba.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 987953a901d2..a165eb8713bc 100644
--- a/arch/x86/kvm/mmu/mmu.c
+++ b/arch/x86/kvm/mmu/mmu.c
@@ -2050,7 +2050,7 @@ static bool mmu_sync_children(struct kvm_vcpu *vcpu,
 			protected |= rmap_write_protect(vcpu, sp->gfn);
 
 		if (protected) {
-			kvm_flush_remote_tlbs(vcpu->kvm);
+			kvm_mmu_flush_or_zap(vcpu, &invalid_list, true, flush);
 			flush = false;
 		}
 
-- 
2.19.1.6.gb485710b