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KVM: nVMX: Ack and write vector info to intr_info if L1 asks us to 

This feature emulates the "Acknowledge interrupt on exit" behavior.
We can safely emulate it for L1 to run L2 even if L0 itself has it
disabled (to run L1).

Signed-off-by: Bandan Das <bsd@redhat.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
hifive-unleashed-5.1
Bandan Das 2014-04-19 18:17:45 -04:00 committed by Marcelo Tosatti
parent 4b85507860
commit 77b0f5d67f
2 changed files with 19 additions and 0 deletions
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1
arch/x86/kvm/irq.c
View File

@ -113,6 +113,7 @@ int kvm_cpu_get_interrupt(struct kvm_vcpu *v)
return kvm_get_apic_interrupt(v); /* APIC */
}
EXPORT_SYMBOL_GPL(kvm_cpu_get_interrupt);
void kvm_inject_pending_timer_irqs(struct kvm_vcpu *vcpu)
{

18
arch/x86/kvm/vmx.c
View File

@ -4526,6 +4526,16 @@ static bool nested_exit_on_intr(struct kvm_vcpu *vcpu)
PIN_BASED_EXT_INTR_MASK;
}
/*
* In nested virtualization, check if L1 has set
* VM_EXIT_ACK_INTR_ON_EXIT
*/
static bool nested_exit_intr_ack_set(struct kvm_vcpu *vcpu)
{
return get_vmcs12(vcpu)->vm_exit_controls &
VM_EXIT_ACK_INTR_ON_EXIT;
}
static bool nested_exit_on_nmi(struct kvm_vcpu *vcpu)
{
return get_vmcs12(vcpu)->pin_based_vm_exec_control &
@ -8563,6 +8573,14 @@ static void nested_vmx_vmexit(struct kvm_vcpu *vcpu, u32 exit_reason,
prepare_vmcs12(vcpu, vmcs12, exit_reason, exit_intr_info,
exit_qualification);
if ((exit_reason == EXIT_REASON_EXTERNAL_INTERRUPT)
&& nested_exit_intr_ack_set(vcpu)) {
int irq = kvm_cpu_get_interrupt(vcpu);
WARN_ON(irq < 0);
vmcs12->vm_exit_intr_info = irq |
INTR_INFO_VALID_MASK | INTR_TYPE_EXT_INTR;
}
trace_kvm_nested_vmexit_inject(vmcs12->vm_exit_reason,
vmcs12->exit_qualification,
vmcs12->idt_vectoring_info_field,