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Commit 2e901c4c authored by Gleb Natapov's avatar Gleb Natapov Committed by Avi Kivity
Browse files

KVM: x86 emulator: fix return values of syscall/sysenter/sysexit emulations 



Return X86EMUL_PROPAGATE_FAULT is fault was injected. Also inject #UD
for those instruction when appropriate.

Signed-off-by: default avatarGleb Natapov <gleb@redhat.com>
Signed-off-by: default avatarMarcelo Tosatti <mtosatti@redhat.com>
parent 1e470be5

arch/x86/kvm/emulate.c

+11 −6
Original line number Diff line number Diff line
@@ -1600,8 +1600,11 @@ emulate_syscall(struct x86_emulate_ctxt *ctxt) 
	u64 msr_data;



	/* syscall is not available in real mode */

	if (ctxt->mode == X86EMUL_MODE_REAL || ctxt->mode == X86EMUL_MODE_VM86)

		return X86EMUL_UNHANDLEABLE;

	if (ctxt->mode == X86EMUL_MODE_REAL ||

	    ctxt->mode == X86EMUL_MODE_VM86) {

		kvm_queue_exception(ctxt->vcpu, UD_VECTOR);

		return X86EMUL_PROPAGATE_FAULT;

	}



	setup_syscalls_segments(ctxt, &cs, &ss);
@@ -1651,14 +1654,16 @@ emulate_sysenter(struct x86_emulate_ctxt *ctxt) 
	/* inject #GP if in real mode */

	if (ctxt->mode == X86EMUL_MODE_REAL) {

		kvm_inject_gp(ctxt->vcpu, 0);

		return X86EMUL_UNHANDLEABLE;

		return X86EMUL_PROPAGATE_FAULT;

	}



	/* XXX sysenter/sysexit have not been tested in 64bit mode.

	* Therefore, we inject an #UD.

	*/

	if (ctxt->mode == X86EMUL_MODE_PROT64)

		return X86EMUL_UNHANDLEABLE;

	if (ctxt->mode == X86EMUL_MODE_PROT64) {

		kvm_queue_exception(ctxt->vcpu, UD_VECTOR);

		return X86EMUL_PROPAGATE_FAULT;

	}



	setup_syscalls_segments(ctxt, &cs, &ss);
@@ -1713,7 +1718,7 @@ emulate_sysexit(struct x86_emulate_ctxt *ctxt) 
	if (ctxt->mode == X86EMUL_MODE_REAL ||

	    ctxt->mode == X86EMUL_MODE_VM86) {

		kvm_inject_gp(ctxt->vcpu, 0);

		return X86EMUL_UNHANDLEABLE;

		return X86EMUL_PROPAGATE_FAULT;

	}



	setup_syscalls_segments(ctxt, &cs, &ss);