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KVM: inject #UD if instruction emulation fails and exit to userspace

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Do not kill VM when instruction emulation fails. Inject #UD and report
failure to userspace instead. Userspace may choose to reenter guest if
vcpu is in userspace (cpl == 3) in which case guest OS will kill
offending process and continue running.

Signed-off-by: Gleb Natapov <gleb@redhat.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
This commit is contained in:
Gleb Natapov
2010-05-10 11:16:56 +03:00
committed by Avi Kivity
parent 57bc24cfd6
commit 6d77dbfc88
5 changed files with 26 additions and 61 deletions
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28
arch/x86/kvm/vmx.c
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@@ -3070,7 +3070,7 @@ static int handle_io(struct kvm_vcpu *vcpu)
++vcpu->stat.io_exits;
if (string || in)
return !(emulate_instruction(vcpu, 0, 0, 0) == EMULATE_DO_MMIO);
return emulate_instruction(vcpu, 0, 0, 0) == EMULATE_DONE;
port = exit_qualification >> 16;
size = (exit_qualification & 7) + 1;
@@ -3327,22 +3327,7 @@ static int handle_wbinvd(struct kvm_vcpu *vcpu)
static int handle_apic_access(struct kvm_vcpu *vcpu)
{
unsigned long exit_qualification;
enum emulation_result er;
unsigned long offset;
exit_qualification = vmcs_readl(EXIT_QUALIFICATION);
offset = exit_qualification & 0xffful;
er = emulate_instruction(vcpu, 0, 0, 0);
if (er != EMULATE_DONE) {
printk(KERN_ERR
"Fail to handle apic access vmexit! Offset is 0x%lx\n",
offset);
return -ENOEXEC;
}
return 1;
return emulate_instruction(vcpu, 0, 0, 0) == EMULATE_DONE;
}
static int handle_task_switch(struct kvm_vcpu *vcpu)
@@ -3554,13 +3539,8 @@ static int handle_invalid_guest_state(struct kvm_vcpu *vcpu)
goto out;
}
if (err != EMULATE_DONE) {
vcpu->run->exit_reason = KVM_EXIT_INTERNAL_ERROR;
vcpu->run->internal.suberror = KVM_INTERNAL_ERROR_EMULATION;
vcpu->run->internal.ndata = 0;
ret = 0;
goto out;
}
if (err != EMULATE_DONE)
return 0;
if (signal_pending(current))
goto out;