Ack interrupt on vmexit is required by Posted Interrupt. With it,
when external interrupt caused vmexit, the cpu will acknowledge the
interrupt controller and save the interrupt's vector in vmcs.
There are several approaches to enable it. This patch uses a simply
way: re-generate an interrupt via self ipi.
Signed-off-by: Yang Zhang <yang.z.zhang@xxxxxxxxx>
---
arch/x86/kvm/vmx.c | 11 ++++++++++-
1 files changed, 10 insertions(+), 1 deletions(-)
diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c
index 7949d21..f6ef090 100644
--- a/arch/x86/kvm/vmx.c
+++ b/arch/x86/kvm/vmx.c
@@ -2525,7 +2525,8 @@ static __init int setup_vmcs_config(struct vmcs_config *vmcs_conf)
#ifdef CONFIG_X86_64
min |= VM_EXIT_HOST_ADDR_SPACE_SIZE;
#endif
- opt = VM_EXIT_SAVE_IA32_PAT | VM_EXIT_LOAD_IA32_PAT;
+ opt = VM_EXIT_SAVE_IA32_PAT | VM_EXIT_LOAD_IA32_PAT |
+ VM_EXIT_ACK_INTR_ON_EXIT;
if (adjust_vmx_controls(min, opt, MSR_IA32_VMX_EXIT_CTLS,
&_vmexit_control) < 0)
return -EIO;
@@ -4457,6 +4458,14 @@ static int handle_exception(struct kvm_vcpu *vcpu)
static int handle_external_interrupt(struct kvm_vcpu *vcpu)
{
+ unsigned int vector;
+
+ vector = vmcs_read32(VM_EXIT_INTR_INFO);
+ vector &= INTR_INFO_VECTOR_MASK;
+
+ apic_eoi();
+ apic->send_IPI_self(vector);
+
++vcpu->stat.irq_exits;
return 1;
}
--
1.7.1
--
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