Commit b2c9d43e authored Nov 02, 2014 by Nadav Amit Committed by Paolo Bonzini Nov 08, 2014

KVM: x86: Return UNHANDLABLE on unsupported SYSENTER



Now that KVM injects #UD on "unhandlable" error, it makes better sense to
return such error on sysenter instead of directly injecting #UD to the guest.
This allows to track more easily the unhandlable cases the emulator does not
support.

Signed-off-by: Nadav Amit <namit@cs.technion.ac.il>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

parent db324fe6

arch/x86/kvm/emulate.c

+2 −4

Original line number	Diff line number	Diff line
		@@ -2358,11 +2358,9 @@ static int em_sysenter(struct x86_emulate_ctxt *ctxt)
		&& !vendor_intel(ctxt))
		return emulate_ud(ctxt);

		/* XXX sysenter/sysexit have not been tested in 64bit mode.
		* Therefore, we inject an #UD.
		*/
		/* sysenter/sysexit have not been tested in 64bit mode. */
		if (ctxt->mode == X86EMUL_MODE_PROT64)
		return emulate_ud(ctxt);
		return X86EMUL_UNHANDLEABLE;

		setup_syscalls_segments(ctxt, &cs, &ss);