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KVM: Check for pending events before attempting injection

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Instead of blindly attempting to inject an event before each guest entry,
check for a possible event first in vcpu->requests.  Sites that can trigger
event injection are modified to set KVM_REQ_EVENT:

- interrupt, nmi window opening
- ppr updates
- i8259 output changes
- local apic irr changes
- rflags updates
- gif flag set
- event set on exit

This improves non-injecting entry performance, and sets the stage for
non-atomic injection.

Signed-off-by: Avi Kivity <avi@redhat.com>
This commit is contained in:
Avi Kivity
2010-07-27 12:30:24 +03:00
parent b0bc3ee2b5
commit 3842d135ff
6 changed files with 58 additions and 12 deletions
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6
arch/x86/kvm/vmx.c
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@@ -3327,6 +3327,7 @@ static int handle_wrmsr(struct kvm_vcpu *vcpu)
static int handle_tpr_below_threshold(struct kvm_vcpu *vcpu)
{
kvm_make_request(KVM_REQ_EVENT, vcpu);
return 1;
}
@@ -3339,6 +3340,8 @@ static int handle_interrupt_window(struct kvm_vcpu *vcpu)
cpu_based_vm_exec_control &= ~CPU_BASED_VIRTUAL_INTR_PENDING;
vmcs_write32(CPU_BASED_VM_EXEC_CONTROL, cpu_based_vm_exec_control);
kvm_make_request(KVM_REQ_EVENT, vcpu);
++vcpu->stat.irq_window_exits;
/*
@@ -3595,6 +3598,7 @@ static int handle_nmi_window(struct kvm_vcpu *vcpu)
cpu_based_vm_exec_control &= ~CPU_BASED_VIRTUAL_NMI_PENDING;
vmcs_write32(CPU_BASED_VM_EXEC_CONTROL, cpu_based_vm_exec_control);
++vcpu->stat.nmi_window_exits;
kvm_make_request(KVM_REQ_EVENT, vcpu);
return 1;
}
@@ -3828,6 +3832,8 @@ static void vmx_complete_interrupts(struct vcpu_vmx *vmx)
if (!idtv_info_valid)
return;
kvm_make_request(KVM_REQ_EVENT, &vmx->vcpu);
vector = idt_vectoring_info & VECTORING_INFO_VECTOR_MASK;
type = idt_vectoring_info & VECTORING_INFO_TYPE_MASK;