From: Avi Kivity <avi@redhat.com>
Date: Sun, 12 Jun 2011 15:14:08 +0000 (+0300)
Subject: KVM: MMU: make kvm_mmu_reset_context() flush the guest TLB
X-Git-Tag: accepted/tizen/common/20141203.182822~6719^2~63
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=45bd07b9d5202c910b31c92bd15572b560198c26;p=platform%2Fkernel%2Flinux-arm64.git

KVM: MMU: make kvm_mmu_reset_context() flush the guest TLB

kvm_set_cr0() and kvm_set_cr4(), and possible other functions,
assume that kvm_mmu_reset_context() flushes the guest TLB.  However,
it does not.

Fix by flushing the tlb (and syncing the new root as well).

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

diff --git a/arch/x86/kvm/mmu.c b/arch/x86/kvm/mmu.c
index da0f3b0..9c629b5 100644
--- a/arch/x86/kvm/mmu.c
+++ b/arch/x86/kvm/mmu.c
@@ -3054,8 +3054,18 @@ static void destroy_kvm_mmu(struct kvm_vcpu *vcpu)
 
 int kvm_mmu_reset_context(struct kvm_vcpu *vcpu)
 {
+	int r;
+
 	destroy_kvm_mmu(vcpu);
-	return init_kvm_mmu(vcpu);
+	r = init_kvm_mmu(vcpu);
+
+	if (r)
+		goto err;
+
+	kvm_mmu_sync_roots(vcpu);
+	kvm_mmu_flush_tlb(vcpu);
+err:
+	return r;
 }
 EXPORT_SYMBOL_GPL(kvm_mmu_reset_context);