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From: Gleb Natapov <gleb@redhat.com>
To: kvm@vger.kernel.org
Cc: chao.zhou@intel.com, pbonzini@redhat.com
Subject: [PATCH] KVM: nEPT: reset PDPTR register cache on nested vmentry emulation
Date: Mon, 2 Sep 2013 15:25:28 +0300	[thread overview]
Message-ID: <20130902122527.GS22899@redhat.com> (raw)

After nested vmentry stale cache can be used to reload L2 PDPTR pointers
which will cause L2 guest to fail. Fix it by invalidating cache on nested
vmentry emulation.

https://bugzilla.kernel.org/show_bug.cgi?id=60830

Signed-off-by: Gleb Natapov <gleb@redhat.com>
diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c
index 57b4e12..6f69aac 100644
--- a/arch/x86/kvm/vmx.c
+++ b/arch/x86/kvm/vmx.c
@@ -7765,6 +7765,10 @@ static void prepare_vmcs02(struct kvm_vcpu *vcpu, struct vmcs12 *vmcs12)
 		vmcs_write64(GUEST_PDPTR1, vmcs12->guest_pdptr1);
 		vmcs_write64(GUEST_PDPTR2, vmcs12->guest_pdptr2);
 		vmcs_write64(GUEST_PDPTR3, vmcs12->guest_pdptr3);
+		__clear_bit(VCPU_EXREG_PDPTR,
+				(unsigned long *)&vcpu->arch.regs_avail);
+		__clear_bit(VCPU_EXREG_PDPTR,
+				(unsigned long *)&vcpu->arch.regs_dirty);
 	}
 
 	kvm_register_write(vcpu, VCPU_REGS_RSP, vmcs12->guest_rsp);
--
			Gleb.

             reply	other threads:[~2013-09-02 12:25 UTC|newest]

Thread overview: 2+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2013-09-02 12:25 Gleb Natapov [this message]
2013-09-12 16:33 ` [PATCH] KVM: nEPT: reset PDPTR register cache on nested vmentry emulation Paolo Bonzini

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