From: Marcelo Tosatti <mtosatti@redhat.com>
Date: Thu, 1 Oct 2009 22:16:58 +0000 (-0300)
Subject: KVM: VMX: flush TLB with INVEPT on cpu migration
X-Git-Url: https://www.infradead.org/git/?a=commitdiff_plain;h=083e9e10dd99629b52e2cfad7eeb4fb6d7511d15;p=users%2Fdwmw2%2Flinux.git

KVM: VMX: flush TLB with INVEPT on cpu migration

It is possible that stale EPTP-tagged mappings are used, if a
vcpu migrates to a different pcpu.

Set KVM_REQ_TLB_FLUSH in vmx_vcpu_load, when switching pcpus, which
will invalidate both VPID and EPT mappings on the next vm-entry.

Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
---

diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c
index e86f1a66316c5..97f4265cda385 100644
--- a/arch/x86/kvm/vmx.c
+++ b/arch/x86/kvm/vmx.c
@@ -708,7 +708,7 @@ static void vmx_vcpu_load(struct kvm_vcpu *vcpu, int cpu)
 	if (vcpu->cpu != cpu) {
 		vcpu_clear(vmx);
 		kvm_migrate_timers(vcpu);
-		vpid_sync_vcpu_all(vmx);
+		set_bit(KVM_REQ_TLB_FLUSH, &vcpu->requests);
 		local_irq_disable();
 		list_add(&vmx->local_vcpus_link,
 			 &per_cpu(vcpus_on_cpu, cpu));