[PATCH 09/42] KVM: Move irq sharing information to irqchip level

Avi Kivity
2009-11-16T12:21:00Z

From: Gleb Natapov <gleb@redhat.com>

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>
---
arch/x86/include/asm/kvm_host.h | 1 -
arch/x86/kvm/irq.h | 1 +
include/linux/kvm_host.h | 2 +-
virt/kvm/ioapic.h | 1 +
virt/kvm/irq_comm.c | 59 +++++++++++++++++++++++---------------
5 files changed, 39 insertions(+), 25 deletions(-)

diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h
index 0b113f2..35d3236 100644
--- 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
--- 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
--- 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
--- 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
--- 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);
}
--
1.6.5.2