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KVM: VMX: Add invalid guest state handler

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This adds the invalid guest state handler function which invokes the x86
emulator until getting the guest to a VMX-friendly state.

[avi: leave atomic context if scheduling]
[guillaume: return to atomic context correctly]

Signed-off-by: Laurent Vivier <laurent.vivier@bull.net>
Signed-off-by: Guillaume Thouvenin <guillaume.thouvenin@ext.bull.net>
Signed-off-by: Mohammed Gamal <m.gamal005@gmail.com>
Signed-off-by: Avi Kivity <avi@qumranet.com>
This commit is contained in:
Mohammed Gamal 2008-08-17 16:47:05 +03:00 committed by Avi Kivity
parent 04fa4d3211
commit ea953ef0ca
1 changed files with 37 additions and 0 deletions
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37
arch/x86/kvm/vmx.c
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@ -2892,6 +2892,43 @@ static int handle_nmi_window(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
return 1;
}
static void handle_invalid_guest_state(struct kvm_vcpu *vcpu,
struct kvm_run *kvm_run)
{
struct vcpu_vmx *vmx = to_vmx(vcpu);
int err;
preempt_enable();
local_irq_enable();
while (!guest_state_valid(vcpu)) {
err = emulate_instruction(vcpu, kvm_run, 0, 0, 0);
switch (err) {
case EMULATE_DONE:
break;
case EMULATE_DO_MMIO:
kvm_report_emulation_failure(vcpu, "mmio");
/* TODO: Handle MMIO */
return;
default:
kvm_report_emulation_failure(vcpu, "emulation failure");
return;
}
if (signal_pending(current))
break;
if (need_resched())
schedule();
}
local_irq_disable();
preempt_disable();
/* Guest state should be valid now, no more emulation should be needed */
vmx->emulation_required = 0;
}
/*
* The exit handlers return 1 if the exit was handled fully and guest execution
* may resume. Otherwise they set the kvm_run parameter to indicate what needs