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KVM: Let ioapic know the irq line status

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Userspace may deliver RTC interrupt without query the status. So we
want to track RTC EOI for this case.

Signed-off-by: Yang Zhang <yang.z.zhang@Intel.com>
Reviewed-by: Gleb Natapov <gleb@redhat.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
This commit is contained in:
Yang Zhang
2013-04-11 19:21:40 +08:00
committed by Marcelo Tosatti
parent f3bff6318f
commit aa2fbe6d44
9 changed files with 54 additions and 37 deletions
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18
virt/kvm/ioapic.c
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@@ -50,7 +50,8 @@
#else
#define ioapic_debug(fmt, arg...)
#endif
static int ioapic_deliver(struct kvm_ioapic *vioapic, int irq);
static int ioapic_deliver(struct kvm_ioapic *vioapic, int irq,
bool line_status);
static unsigned long ioapic_read_indirect(struct kvm_ioapic *ioapic,
unsigned long addr,
@@ -146,7 +147,8 @@ static void kvm_rtc_eoi_tracking_restore_all(struct kvm_ioapic *ioapic)
__rtc_irq_eoi_tracking_restore_one(vcpu);
}
static int ioapic_service(struct kvm_ioapic *ioapic, unsigned int idx)
static int ioapic_service(struct kvm_ioapic *ioapic, unsigned int idx,
bool line_status)
{
union kvm_ioapic_redirect_entry *pent;
int injected = -1;
@@ -154,7 +156,7 @@ static int ioapic_service(struct kvm_ioapic *ioapic, unsigned int idx)
pent = &ioapic->redirtbl[idx];
if (!pent->fields.mask) {
injected = ioapic_deliver(ioapic, idx);
injected = ioapic_deliver(ioapic, idx, line_status);
if (injected && pent->fields.trig_mode == IOAPIC_LEVEL_TRIG)
pent->fields.remote_irr = 1;
}
@@ -248,13 +250,13 @@ static void ioapic_write_indirect(struct kvm_ioapic *ioapic, u32 val)
kvm_fire_mask_notifiers(ioapic->kvm, KVM_IRQCHIP_IOAPIC, index, mask_after);
if (e->fields.trig_mode == IOAPIC_LEVEL_TRIG
&& ioapic->irr & (1 << index))
ioapic_service(ioapic, index);
ioapic_service(ioapic, index, false);
kvm_ioapic_make_eoibitmap_request(ioapic->kvm);
break;
}
}
static int ioapic_deliver(struct kvm_ioapic *ioapic, int irq)
static int ioapic_deliver(struct kvm_ioapic *ioapic, int irq, bool line_status)
{
union kvm_ioapic_redirect_entry *entry = &ioapic->redirtbl[irq];
struct kvm_lapic_irq irqe;
@@ -277,7 +279,7 @@ static int ioapic_deliver(struct kvm_ioapic *ioapic, int irq)
}
int kvm_ioapic_set_irq(struct kvm_ioapic *ioapic, int irq, int irq_source_id,
int level)
int level, bool line_status)
{
u32 old_irr;
u32 mask = 1 << irq;
@@ -300,7 +302,7 @@ int kvm_ioapic_set_irq(struct kvm_ioapic *ioapic, int irq, int irq_source_id,
ioapic->irr |= mask;
if ((edge && old_irr != ioapic->irr) ||
(!edge && !entry.fields.remote_irr))
ret = ioapic_service(ioapic, irq);
ret = ioapic_service(ioapic, irq, line_status);
else
ret = 0; /* report coalesced interrupt */
}
@@ -349,7 +351,7 @@ static void __kvm_ioapic_update_eoi(struct kvm_vcpu *vcpu,
ASSERT(ent->fields.trig_mode == IOAPIC_LEVEL_TRIG);
ent->fields.remote_irr = 0;
if (!ent->fields.mask && (ioapic->irr & (1 << i)))
ioapic_service(ioapic, i);
ioapic_service(ioapic, i, false);
}
}