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KVM: Remove irq_pending bitmap

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Only one interrupt vector can be injected from userspace irqchip at
any given time so no need to store it in a bitmap. Put it into interrupt
queue directly.

Signed-off-by: Gleb Natapov <gleb@redhat.com>
Signed-off-by: Avi Kivity <avi@redhat.com>
This commit is contained in:
Gleb Natapov 2009-05-11 13:35:48 +03:00 committed by Avi Kivity
parent fa9726b073
commit 923c61bbc6
4 changed files with 13 additions and 43 deletions
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2
arch/x86/include/asm/kvm_host.h
View File

@ -266,8 +266,6 @@ struct kvm_mmu {
struct kvm_vcpu_arch {
u64 host_tsc;
unsigned long irq_summary; /* bit vector: 1 per word in irq_pending */
DECLARE_BITMAP(irq_pending, KVM_NR_INTERRUPTS);
/*
* rip and regs accesses must go through
* kvm_{register,rip}_{read,write} functions.

4
arch/x86/kvm/irq.c
View File

@ -50,7 +50,7 @@ int kvm_cpu_has_interrupt(struct kvm_vcpu *v)
struct kvm_pic *s;
if (!irqchip_in_kernel(v->kvm))
return v->arch.irq_summary;
return v->arch.interrupt.pending;
if (kvm_apic_has_interrupt(v) == -1) { /* LAPIC */
if (kvm_apic_accept_pic_intr(v)) {
@ -72,7 +72,7 @@ int kvm_cpu_get_interrupt(struct kvm_vcpu *v)
int vector;
if (!irqchip_in_kernel(v->kvm))
return kvm_pop_irq(v);
return v->arch.interrupt.nr;
vector = kvm_get_apic_interrupt(v); /* APIC */
if (vector == -1) {

38
arch/x86/kvm/x86.c
View File

@ -1441,8 +1441,7 @@ static int kvm_vcpu_ioctl_interrupt(struct kvm_vcpu *vcpu,
return -ENXIO;
vcpu_load(vcpu);
set_bit(irq->irq, vcpu->arch.irq_pending);
set_bit(irq->irq / BITS_PER_LONG, &vcpu->arch.irq_summary);
kvm_queue_interrupt(vcpu, irq->irq);
vcpu_put(vcpu);
@ -3583,12 +3582,7 @@ int kvm_arch_vcpu_ioctl_get_sregs(struct kvm_vcpu *vcpu,
sregs->efer = vcpu->arch.shadow_efer;
sregs->apic_base = kvm_get_apic_base(vcpu);
if (irqchip_in_kernel(vcpu->kvm))
memset(sregs->interrupt_bitmap, 0,
sizeof sregs->interrupt_bitmap);
else
memcpy(sregs->interrupt_bitmap, vcpu->arch.irq_pending,
sizeof sregs->interrupt_bitmap);
memset(sregs->interrupt_bitmap, 0, sizeof sregs->interrupt_bitmap);
if (vcpu->arch.interrupt.pending)
set_bit(vcpu->arch.interrupt.nr,
@ -4058,7 +4052,7 @@ int kvm_arch_vcpu_ioctl_set_sregs(struct kvm_vcpu *vcpu,
struct kvm_sregs *sregs)
{
int mmu_reset_needed = 0;
int i, pending_vec, max_bits;
int pending_vec, max_bits;
struct descriptor_table dt;
vcpu_load(vcpu);
@ -4100,24 +4094,14 @@ int kvm_arch_vcpu_ioctl_set_sregs(struct kvm_vcpu *vcpu,
if (mmu_reset_needed)
kvm_mmu_reset_context(vcpu);
if (!irqchip_in_kernel(vcpu->kvm)) {
memcpy(vcpu->arch.irq_pending, sregs->interrupt_bitmap,
sizeof vcpu->arch.irq_pending);
vcpu->arch.irq_summary = 0;
for (i = 0; i < ARRAY_SIZE(vcpu->arch.irq_pending); ++i)
if (vcpu->arch.irq_pending[i])
__set_bit(i, &vcpu->arch.irq_summary);
} else {
max_bits = (sizeof sregs->interrupt_bitmap) << 3;
pending_vec = find_first_bit(
(const unsigned long *)sregs->interrupt_bitmap,
max_bits);
/* Only pending external irq is handled here */
if (pending_vec < max_bits) {
kvm_queue_interrupt(vcpu, pending_vec);
pr_debug("Set back pending irq %d\n", pending_vec);
}
kvm_pic_clear_isr_ack(vcpu->kvm);
max_bits = (sizeof sregs->interrupt_bitmap) << 3;
pending_vec = find_first_bit(
(const unsigned long *)sregs->interrupt_bitmap, max_bits);
if (pending_vec < max_bits) {
kvm_queue_interrupt(vcpu, pending_vec);
pr_debug("Set back pending irq %d\n", pending_vec);
if (irqchip_in_kernel(vcpu->kvm))
kvm_pic_clear_isr_ack(vcpu->kvm);
}
kvm_set_segment(vcpu, &sregs->cs, VCPU_SREG_CS);

12
arch/x86/kvm/x86.h
View File

@ -19,18 +19,6 @@ static inline void kvm_clear_interrupt_queue(struct kvm_vcpu *vcpu)
vcpu->arch.interrupt.pending = false;
}
static inline u8 kvm_pop_irq(struct kvm_vcpu *vcpu)
{
int word_index = __ffs(vcpu->arch.irq_summary);
int bit_index = __ffs(vcpu->arch.irq_pending[word_index]);
int irq = word_index * BITS_PER_LONG + bit_index;
clear_bit(bit_index, &vcpu->arch.irq_pending[word_index]);
if (!vcpu->arch.irq_pending[word_index])
clear_bit(word_index, &vcpu->arch.irq_summary);
return irq;
}
static inline bool kvm_event_needs_reinjection(struct kvm_vcpu *vcpu)
{
return vcpu->arch.exception.pending || vcpu->arch.interrupt.pending ||