KVM: Move irq sharing information to irqchip level

This removes assumptions that max GSIs is smaller than number of pins.
Sharing is tracked on pin level not GSI level.

[avi: no PIC on ia64]

Signed-off-by: Gleb Natapov <gleb@redhat.com>
Signed-off-by: Avi Kivity <avi@redhat.com>

diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h
index 0b113f2..35d3236 100644 (file)
--- a/arch/x86/include/asm/kvm_host.h
+++ b/arch/x86/include/asm/kvm_host.h
@@ -410,7 +410,6 @@ struct kvm_arch{
        gpa_t ept_identity_map_addr;
 
        unsigned long irq_sources_bitmap;
-       unsigned long irq_states[KVM_IOAPIC_NUM_PINS];
        u64 vm_init_tsc;
 };
 

diff --git a/arch/x86/kvm/irq.h b/arch/x86/kvm/irq.h
index 7d6058a..c025a23 100644 (file)
--- a/arch/x86/kvm/irq.h
+++ b/arch/x86/kvm/irq.h
@@ -71,6 +71,7 @@ struct kvm_pic {
        int output;             /* intr from master PIC */
        struct kvm_io_device dev;
        void (*ack_notifier)(void *opaque, int irq);
+       unsigned long irq_states[16];
 };
 
 struct kvm_pic *kvm_create_pic(struct kvm *kvm);

diff --git a/include/linux/kvm_host.h b/include/linux/kvm_host.h
index b7bbb5d..1c7f8c4 100644 (file)
--- a/include/linux/kvm_host.h
+++ b/include/linux/kvm_host.h
@@ -120,7 +120,7 @@ struct kvm_kernel_irq_routing_entry {
        u32 gsi;
        u32 type;
        int (*set)(struct kvm_kernel_irq_routing_entry *e,
-                   struct kvm *kvm, int level);
+                  struct kvm *kvm, int irq_source_id, int level);
        union {
                struct {
                        unsigned irqchip;

diff --git a/virt/kvm/ioapic.h b/virt/kvm/ioapic.h
index 7080b71..6e461ad 100644 (file)
--- a/virt/kvm/ioapic.h
+++ b/virt/kvm/ioapic.h
@@ -41,6 +41,7 @@ struct kvm_ioapic {
        u32 irr;
        u32 pad;
        union kvm_ioapic_redirect_entry redirtbl[IOAPIC_NUM_PINS];
+       unsigned long irq_states[IOAPIC_NUM_PINS];
        struct kvm_io_device dev;
        struct kvm *kvm;
        void (*ack_notifier)(void *opaque, int irq);

diff --git a/virt/kvm/irq_comm.c b/virt/kvm/irq_comm.c
index 001663f..9783f5c 100644 (file)
--- a/virt/kvm/irq_comm.c
+++ b/virt/kvm/irq_comm.c
@@ -31,20 +31,39 @@
 
 #include "ioapic.h"
 
+static inline int kvm_irq_line_state(unsigned long *irq_state,
+                                    int irq_source_id, int level)
+{
+       /* Logical OR for level trig interrupt */
+       if (level)
+               set_bit(irq_source_id, irq_state);
+       else
+               clear_bit(irq_source_id, irq_state);
+
+       return !!(*irq_state);
+}
+
 static int kvm_set_pic_irq(struct kvm_kernel_irq_routing_entry *e,
-                          struct kvm *kvm, int level)
+                          struct kvm *kvm, int irq_source_id, int level)
 {
 #ifdef CONFIG_X86
-       return kvm_pic_set_irq(pic_irqchip(kvm), e->irqchip.pin, level);
+       struct kvm_pic *pic = pic_irqchip(kvm);
+       level = kvm_irq_line_state(&pic->irq_states[e->irqchip.pin],
+                                  irq_source_id, level);
+       return kvm_pic_set_irq(pic, e->irqchip.pin, level);
 #else
        return -1;
 #endif
 }
 
 static int kvm_set_ioapic_irq(struct kvm_kernel_irq_routing_entry *e,
-                             struct kvm *kvm, int level)
+                             struct kvm *kvm, int irq_source_id, int level)
 {
-       return kvm_ioapic_set_irq(kvm->arch.vioapic, e->irqchip.pin, level);
+       struct kvm_ioapic *ioapic = kvm->arch.vioapic;
+       level = kvm_irq_line_state(&ioapic->irq_states[e->irqchip.pin],
+                                  irq_source_id, level);
+
+       return kvm_ioapic_set_irq(ioapic, e->irqchip.pin, level);
 }
 
 inline static bool kvm_is_dm_lowest_prio(struct kvm_lapic_irq *irq)
@@ -96,10 +115,13 @@ int kvm_irq_delivery_to_apic(struct kvm *kvm, struct kvm_lapic *src,
 }
 
 static int kvm_set_msi(struct kvm_kernel_irq_routing_entry *e,
-                      struct kvm *kvm, int level)
+                      struct kvm *kvm, int irq_source_id, int level)
 {
        struct kvm_lapic_irq irq;
 
+       if (!level)
+               return -1;
+
        trace_kvm_msi_set_irq(e->msi.address_lo, e->msi.data);
 
        irq.dest_id = (e->msi.address_lo &
@@ -125,34 +147,19 @@ static int kvm_set_msi(struct kvm_kernel_irq_routing_entry *e,
 int kvm_set_irq(struct kvm *kvm, int irq_source_id, int irq, int level)
 {
        struct kvm_kernel_irq_routing_entry *e;
-       unsigned long *irq_state, sig_level;
        int ret = -1;
 
        trace_kvm_set_irq(irq, level, irq_source_id);
 
        WARN_ON(!mutex_is_locked(&kvm->irq_lock));
 
-       if (irq < KVM_IOAPIC_NUM_PINS) {
-               irq_state = (unsigned long *)&kvm->arch.irq_states[irq];
-
-               /* Logical OR for level trig interrupt */
-               if (level)
-                       set_bit(irq_source_id, irq_state);
-               else
-                       clear_bit(irq_source_id, irq_state);
-               sig_level = !!(*irq_state);
-       } else if (!level)
-               return ret;
-       else /* Deal with MSI/MSI-X */
-               sig_level = 1;
-
        /* Not possible to detect if the guest uses the PIC or the
         * IOAPIC.  So set the bit in both. The guest will ignore
         * writes to the unused one.
         */
        list_for_each_entry(e, &kvm->irq_routing, link)
                if (e->gsi == irq) {
-                       int r = e->set(e, kvm, sig_level);
+                       int r = e->set(e, kvm, irq_source_id, level);
                        if (r < 0)
                                continue;
 
@@ -232,8 +239,14 @@ void kvm_free_irq_source_id(struct kvm *kvm, int irq_source_id)
                printk(KERN_ERR "kvm: IRQ source ID out of range!\n");
                return;
        }
-       for (i = 0; i < KVM_IOAPIC_NUM_PINS; i++)
-               clear_bit(irq_source_id, &kvm->arch.irq_states[i]);
+       for (i = 0; i < KVM_IOAPIC_NUM_PINS; i++) {
+               clear_bit(irq_source_id, &kvm->arch.vioapic->irq_states[i]);
+               if (i >= 16)
+                       continue;
+#ifdef CONFIG_X86
+               clear_bit(irq_source_id, &pic_irqchip(kvm)->irq_states[i]);
+#endif
+       }
        clear_bit(irq_source_id, &kvm->arch.irq_sources_bitmap);
        mutex_unlock(&kvm->irq_lock);
 }