[patch 17/26] KVM: VMX: flush TLB with INVEPT on cpu migration

Greg KH
2009-10-09T23:18:03Z

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2.6.31-stable review patch. If anyone has any objections, please let us know.

------------------
From: Marcelo Tosatti <mtosatti@redhat.com>

commit eb5109e311b5152c0614a28d7d615d087f268f19 upstream.

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>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

---
arch/x86/kvm/vmx.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

--- a/arch/x86/kvm/vmx.c
+++ b/arch/x86/kvm/vmx.c
@@ -661,7 +661,7 @@ static void vmx_vcpu_load(struct kvm_vcp
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));