KVM: nEPT: reset PDPTR register cache on nested vmentry emulation

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 <[email protected]>

arch/x86/kvm/vmx.c +4 -1

index 57b4e12..6f69aac 100644
@@ -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.
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