KVM: irq ack notification

Based on a patch from: Ben-Ami Yassour <benami@il.ibm.com>
which was based on a patch from: Amit Shah <amit.shah@qumranet.com>

Notify IRQ acking on PIC/APIC emulation. The previous patch missed two things:

- Edge triggered interrupts on IOAPIC
- PIC reset with IRR/ISR set should be equivalent to ack (LAPIC probably
needs something similar).

Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
CC: Amit Shah <amit.shah@qumranet.com>
CC: Ben-Ami Yassour <benami@il.ibm.com>
Signed-off-by: Avi Kivity <avi@qumranet.com>

6 files changed, 34 insertions, 13 deletions

diff --git a/arch/x86/kvm/i8259.c b/arch/x86/kvm/i8259.c
index 55e179ad98ef..de704995b819 100644
--- a/arch/x86/kvm/i8259.c
+++ b/arch/x86/kvm/i8259.c
@@ -159,9 +159,10 @@ static inline void pic_intack(struct kvm_kpic_state *s, int irq)
                 s->irr &= ~(1 << irq);
 }
 
-int kvm_pic_read_irq(struct kvm_pic *s)
+int kvm_pic_read_irq(struct kvm *kvm)
 {
         int irq, irq2, intno;
+        struct kvm_pic *s = pic_irqchip(kvm);
 
         irq = pic_get_irq(&s->pics[0]);
         if (irq >= 0) {
@@ -187,12 +188,21 @@ int kvm_pic_read_irq(struct kvm_pic *s)
                 intno = s->pics[0].irq_base + irq;
         }
         pic_update_irq(s);
+        kvm_notify_acked_irq(kvm, irq);
 
         return intno;
 }
 
 void kvm_pic_reset(struct kvm_kpic_state *s)
 {
+        int irq;
+        struct kvm *kvm = s->pics_state->irq_request_opaque;
+
+        for (irq = 0; irq < PIC_NUM_PINS; irq++) {
+                if (!(s->imr & (1 << irq)) && (s->irr & (1 << irq) ||
+                    s->isr & (1 << irq)))
+                        kvm_notify_acked_irq(kvm, irq);
+        }
         s->last_irr = 0;
         s->irr = 0;
         s->imr = 0;
diff --git a/arch/x86/kvm/irq.c b/arch/x86/kvm/irq.c
index 90911958d853..3c508afaa285 100644
--- a/arch/x86/kvm/irq.c
+++ b/arch/x86/kvm/irq.c
@@ -72,7 +72,7 @@ int kvm_cpu_get_interrupt(struct kvm_vcpu *v)
                 if (kvm_apic_accept_pic_intr(v)) {
                         s = pic_irqchip(v->kvm);
                         s->output = 0;          /* PIC */
-                        vector = kvm_pic_read_irq(s);
+                        vector = kvm_pic_read_irq(v->kvm);
                 }
         }
         return vector;
diff --git a/arch/x86/kvm/irq.h b/arch/x86/kvm/irq.h
index 95fe718e3abc..479a3d2d5614 100644
--- a/arch/x86/kvm/irq.h
+++ b/arch/x86/kvm/irq.h
@@ -63,11 +63,12 @@ struct kvm_pic {
         void *irq_request_opaque;
         int output;             /* intr from master PIC */
         struct kvm_io_device dev;
+        void (*ack_notifier)(void *opaque, int irq);
 };
 
 struct kvm_pic *kvm_create_pic(struct kvm *kvm);
 void kvm_pic_set_irq(void *opaque, int irq, int level);
-int kvm_pic_read_irq(struct kvm_pic *s);
+int kvm_pic_read_irq(struct kvm *kvm);
 void kvm_pic_update_irq(struct kvm_pic *s);
 
 static inline struct kvm_pic *pic_irqchip(struct kvm *kvm)
diff --git a/arch/x86/kvm/lapic.c b/arch/x86/kvm/lapic.c
index 9fde0ac24268..be94f93a73f6 100644
--- a/arch/x86/kvm/lapic.c
+++ b/arch/x86/kvm/lapic.c
@@ -439,7 +439,7 @@ struct kvm_vcpu *kvm_get_lowest_prio_vcpu(struct kvm *kvm, u8 vector,
 static void apic_set_eoi(struct kvm_lapic *apic)
 {
         int vector = apic_find_highest_isr(apic);
-
+        int trigger_mode;
         /*
          * Not every write EOI will has corresponding ISR,
          * one example is when Kernel check timer on setup_IO_APIC
@@ -451,7 +451,10 @@ static void apic_set_eoi(struct kvm_lapic *apic)
         apic_update_ppr(apic);
 
         if (apic_test_and_clear_vector(vector, apic->regs + APIC_TMR))
-                kvm_ioapic_update_eoi(apic->vcpu->kvm, vector);
+                trigger_mode = IOAPIC_LEVEL_TRIG;
+        else
+                trigger_mode = IOAPIC_EDGE_TRIG;
+        kvm_ioapic_update_eoi(apic->vcpu->kvm, vector, trigger_mode);
 }
 
 static void apic_send_ipi(struct kvm_lapic *apic)
diff --git a/virt/kvm/ioapic.c b/virt/kvm/ioapic.c
index c0d22870ee9c..515cd7ce761c 100644
--- a/virt/kvm/ioapic.c
+++ b/virt/kvm/ioapic.c
@@ -39,6 +39,7 @@
 
 #include "ioapic.h"
 #include "lapic.h"
+#include "irq.h"
 
 #if 0
 #define ioapic_debug(fmt,arg...) printk(KERN_WARNING fmt,##arg)
@@ -285,26 +286,31 @@ void kvm_ioapic_set_irq(struct kvm_ioapic *ioapic, int irq, int level)
         }
 }
 
-static void __kvm_ioapic_update_eoi(struct kvm_ioapic *ioapic, int gsi)
+static void __kvm_ioapic_update_eoi(struct kvm_ioapic *ioapic, int gsi,
+                                    int trigger_mode)
 {
         union ioapic_redir_entry *ent;
 
         ent = &ioapic->redirtbl[gsi];
-        ASSERT(ent->fields.trig_mode == IOAPIC_LEVEL_TRIG);
 
-        ent->fields.remote_irr = 0;
-        if (!ent->fields.mask && (ioapic->irr & (1 << gsi)))
-                ioapic_service(ioapic, gsi);
+        kvm_notify_acked_irq(ioapic->kvm, gsi);
+
+        if (trigger_mode == IOAPIC_LEVEL_TRIG) {
+                ASSERT(ent->fields.trig_mode == IOAPIC_LEVEL_TRIG);
+                ent->fields.remote_irr = 0;
+                if (!ent->fields.mask && (ioapic->irr & (1 << gsi)))
+                        ioapic_service(ioapic, gsi);
+        }
 }
 
-void kvm_ioapic_update_eoi(struct kvm *kvm, int vector)
+void kvm_ioapic_update_eoi(struct kvm *kvm, int vector, int trigger_mode)
 {
         struct kvm_ioapic *ioapic = kvm->arch.vioapic;
         int i;
 
         for (i = 0; i < IOAPIC_NUM_PINS; i++)
                 if (ioapic->redirtbl[i].fields.vector == vector)
-                        __kvm_ioapic_update_eoi(ioapic, i);
+                        __kvm_ioapic_update_eoi(ioapic, i, trigger_mode);
 }
 
 static int ioapic_in_range(struct kvm_io_device *this, gpa_t addr,
diff --git a/virt/kvm/ioapic.h b/virt/kvm/ioapic.h
index 7f16675fe783..b52732f493c1 100644
--- a/virt/kvm/ioapic.h
+++ b/virt/kvm/ioapic.h
@@ -58,6 +58,7 @@ struct kvm_ioapic {
         } redirtbl[IOAPIC_NUM_PINS];
         struct kvm_io_device dev;
         struct kvm *kvm;
+        void (*ack_notifier)(void *opaque, int irq);
 };
 
 #ifdef DEBUG
@@ -87,7 +88,7 @@ static inline int irqchip_in_kernel(struct kvm *kvm)
 
 struct kvm_vcpu *kvm_get_lowest_prio_vcpu(struct kvm *kvm, u8 vector,
                                        unsigned long bitmap);
-void kvm_ioapic_update_eoi(struct kvm *kvm, int vector);
+void kvm_ioapic_update_eoi(struct kvm *kvm, int vector, int trigger_mode);
 int kvm_ioapic_init(struct kvm *kvm);
 void kvm_ioapic_set_irq(struct kvm_ioapic *ioapic, int irq, int level);
 void kvm_ioapic_reset(struct kvm_ioapic *ioapic);