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authorGleb Natapov <gleb@redhat.com>2009-05-11 13:35:48 +0300
committerAvi Kivity <avi@redhat.com>2009-06-10 11:48:57 +0300
commit923c61bbc6413e87e5f6b0bae663d202a8de0537 (patch)
treea4ae8262a60f343bedb29f06be8510a21ef11dc8 /arch/x86
parentfa9726b0733461781933ab7180aca45e46d0a891 (diff)
downloadop-kernel-dev-923c61bbc6413e87e5f6b0bae663d202a8de0537.zip
op-kernel-dev-923c61bbc6413e87e5f6b0bae663d202a8de0537.tar.gz
KVM: Remove irq_pending bitmap
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>
Diffstat (limited to 'arch/x86')
-rw-r--r--arch/x86/include/asm/kvm_host.h2
-rw-r--r--arch/x86/kvm/irq.c4
-rw-r--r--arch/x86/kvm/x86.c38
-rw-r--r--arch/x86/kvm/x86.h12
4 files changed, 13 insertions, 43 deletions
diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h
index 16d1481..977a785 100644
--- a/arch/x86/include/asm/kvm_host.h
+++ b/arch/x86/include/asm/kvm_host.h
@@ -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.
diff --git a/arch/x86/kvm/irq.c b/arch/x86/kvm/irq.c
index 11c2757..96dfbb6 100644
--- a/arch/x86/kvm/irq.c
+++ b/arch/x86/kvm/irq.c
@@ -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) {
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index 96413f4..54eec35 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -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);
diff --git a/arch/x86/kvm/x86.h b/arch/x86/kvm/x86.h
index 21203d4..c1f1a8c 100644
--- a/arch/x86/kvm/x86.h
+++ b/arch/x86/kvm/x86.h
@@ -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 ||
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