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

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

Signed-off-by: Gleb Natapov <gleb@redhat.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
This commit is contained in:
Gleb Natapov 2010-03-18 15:20:12 +02:00 committed by Avi Kivity
parent 1e470be5a1
commit 2e901c4cf4
1 changed files with 11 additions and 6 deletions
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17
arch/x86/kvm/emulate.c
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@ -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);