From: Avi Kivity <avi@qumranet.com>
Date: Wed, 27 Aug 2008 13:40:51 +0000 (+0300)
Subject: KVM: MMU: Flush tlbs after clearing write permission when accessing dirty log
X-Git-Tag: firefly_0821_release~17377^2~60
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=171d595d3b3254b9a952af8d1f6965d2e85dcbaa;p=firefly-linux-kernel-4.4.55.git

KVM: MMU: Flush tlbs after clearing write permission when accessing dirty log

Otherwise, the cpu may allow writes to the tracked pages, and we lose
some display bits or fail to migrate correctly.

Signed-off-by: Avi Kivity <avi@qumranet.com>
---

diff --git a/arch/x86/kvm/mmu.c b/arch/x86/kvm/mmu.c
index 5052acdc0a77..853a2889b202 100644
--- a/arch/x86/kvm/mmu.c
+++ b/arch/x86/kvm/mmu.c
@@ -2111,6 +2111,7 @@ void kvm_mmu_slot_remove_write_access(struct kvm *kvm, int slot)
 			if (pt[i] & PT_WRITABLE_MASK)
 				pt[i] &= ~PT_WRITABLE_MASK;
 	}
+	kvm_flush_remote_tlbs(kvm);
 	spin_unlock(&kvm->mmu_lock);
 }