linux-kernel - [PATCH 11/11] KVM/MMU: Flush tlb in the kvm_age

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Message-Id: <20190104085405.40356-12-Tianyu.Lan@microsoft.com>
Date:   Fri,  4 Jan 2019 16:54:05 +0800
From:   lantianyu1986@...il.com
To:     unlisted-recipients:; (no To-header on input)
Cc:     Lan Tianyu <Tianyu.Lan@...rosoft.com>, pbonzini@...hat.com,
        rkrcmar@...hat.com, tglx@...utronix.de, mingo@...hat.com,
        bp@...en8.de, hpa@...or.com, x86@...nel.org, kvm@...r.kernel.org,
        linux-kernel@...r.kernel.org, michael.h.kelley@...rosoft.com,
        kys@...rosoft.com, vkuznets@...hat.com, linux@...linux.org.uk
Subject: [PATCH 11/11] KVM/MMU: Flush tlb in the kvm_age_rmapp()

From: Lan Tianyu <Tianyu.Lan@...rosoft.com>

This patch is to flush tlb in the kvm_age_rmapp() when tlb range flush
is available and flush request is true.

Signed-off-by: Lan Tianyu <Tianyu.Lan@...rosoft.com>
---
 arch/x86/kvm/mmu.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/arch/x86/kvm/mmu.c b/arch/x86/kvm/mmu.c
index a5728f51bf7d..bc402a72956a 100644
--- a/arch/x86/kvm/mmu.c
+++ b/arch/x86/kvm/mmu.c
@@ -1958,10 +1958,17 @@ static int kvm_age_rmapp(struct kvm *kvm, struct kvm_rmap_head *rmap_head,
 	u64 *sptep;
 	struct rmap_iterator uninitialized_var(iter);
 	int young = 0;
+	bool flush = (bool)data;
 
 	for_each_rmap_spte(rmap_head, &iter, sptep)
 		young |= mmu_spte_age(sptep);
 
+	if (young && flush) {
+		kvm_flush_remote_tlbs_with_address(kvm, gfn,
+				KVM_PAGES_PER_HPAGE(level));
+		young = 0;
+	}
+
 	trace_kvm_age_page(gfn, level, slot, young);
 	return young;
 }
-- 
2.14.4