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Commit e1de91cc authored by Sean Christopherson's avatar Sean Christopherson Committed by Paolo Bonzini
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KVM: VMX: WARN on a MOV CR3 exit w/ unrestricted guest 



CR3 load/store exiting are always off when unrestricted guest
is enabled.  WARN on the associated CR3 VMEXIT to detect code
that would re-introduce CR3 load/store exiting for unrestricted
guest.

Signed-off-by: default avatarSean Christopherson <sean.j.christopherson@intel.com>
Signed-off-by: default avatarRadim Krčmář <rkrcmar@redhat.com>
parent b4d18517

arch/x86/kvm/vmx.c

+2 −0
Original line number Diff line number Diff line
@@ -6377,6 +6377,7 @@ static int handle_cr(struct kvm_vcpu *vcpu) 
			err = handle_set_cr0(vcpu, val);

			return kvm_complete_insn_gp(vcpu, err);

		case 3:

			WARN_ON_ONCE(enable_unrestricted_guest);

			err = kvm_set_cr3(vcpu, val);

			return kvm_complete_insn_gp(vcpu, err);

		case 4:
@@ -6409,6 +6410,7 @@ static int handle_cr(struct kvm_vcpu *vcpu) 
	case 1: /*mov from cr*/

		switch (cr) {

		case 3:

			WARN_ON_ONCE(enable_unrestricted_guest);

			val = kvm_read_cr3(vcpu);

			kvm_register_write(vcpu, reg, val);

			trace_kvm_cr_read(cr, val);