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authorGleb Natapov <gleb@redhat.com>2009-08-24 11:54:19 +0300
committerAvi Kivity <avi@redhat.com>2009-12-03 09:32:06 +0200
commit1a6e4a8c276e122dbeb6f9c610f29735e4236bfd (patch)
treea954fc1865f41cd79e5336c59904de1213e141d5 /virt
parent79c727d4371aa9af47b0cdbcad53742b5a7919ea (diff)
downloadvexpress-lsk-1a6e4a8c276e122dbeb6f9c610f29735e4236bfd.tar.gz
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>
Diffstat (limited to 'virt')
-rw-r--r--virt/kvm/ioapic.h1
-rw-r--r--virt/kvm/irq_comm.c59
2 files changed, 37 insertions, 23 deletions
diff --git a/virt/kvm/ioapic.h b/virt/kvm/ioapic.h
index 7080b713c16..6e461ade636 100644
--- 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 001663ff401..9783f5c43da 100644
--- 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);
}