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kvm-all.c: add qemu_irq/gsi hash table and utility routines 

VFIO platform device needs to setup irqfd but it does not know the
gsi corresponding to the device qemu_irq. This patch proposes to
store a hash table in kvm_state using the qemu_irq as key and the gsi
as a value.

kvm_irqchip_set_qemuirq_gsi allows to insert such a pair. The interrupt
controller is supposed to use it.

kvm_irqchip_[add, remove]_irqfd_notifier allows to setup/tear down
irqfd directly from the qemu_irq.

Signed-off-by: Eric Auger <eric.auger@linaro.org>
Tested-by: Vikram Sethi <vikrams@codeaurora.org>
Acked-by: Paolo Bonzini <pbonzini@redhat.com>
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
This commit is contained in:
Eric Auger 2015-07-06 12:15:13 -06:00 committed by Alex Williamson
parent 1c9b71a731
commit 197e35249a
2 changed files with 39 additions and 0 deletions
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6
include/sysemu/kvm.h
View File

@ -19,6 +19,7 @@
#include "qemu/queue.h"
#include "qom/cpu.h"
#include "exec/memattrs.h"
#include "hw/irq.h"
#ifdef CONFIG_KVM
#include <linux/kvm.h>
@ -420,6 +421,11 @@ int kvm_irqchip_add_irqfd_notifier_gsi(KVMState *s, EventNotifier *n,
EventNotifier *rn, int virq);
int kvm_irqchip_remove_irqfd_notifier_gsi(KVMState *s, EventNotifier *n,
int virq);
int kvm_irqchip_add_irqfd_notifier(KVMState *s, EventNotifier *n,
EventNotifier *rn, qemu_irq irq);
int kvm_irqchip_remove_irqfd_notifier(KVMState *s, EventNotifier *n,
qemu_irq irq);
void kvm_irqchip_set_qemuirq_gsi(KVMState *s, qemu_irq irq, int gsi);
void kvm_pc_gsi_handler(void *opaque, int n, int level);
void kvm_pc_setup_irq_routing(bool pci_enabled);
void kvm_init_irq_routing(KVMState *s);

33
kvm-all.c
View File

@ -37,6 +37,7 @@
#include "exec/address-spaces.h"
#include "qemu/event_notifier.h"
#include "trace.h"
#include "hw/irq.h"
#include "hw/boards.h"
@ -98,6 +99,7 @@ struct KVMState
* unsigned, and treating them as signed here can break things */
unsigned irq_set_ioctl;
unsigned int sigmask_len;
GHashTable *gsimap;
#ifdef KVM_CAP_IRQ_ROUTING
struct kvm_irq_routing *irq_routes;
int nr_allocated_irq_routes;
@ -1342,6 +1344,35 @@ int kvm_irqchip_remove_irqfd_notifier_gsi(KVMState *s, EventNotifier *n,
false);
}
int kvm_irqchip_add_irqfd_notifier(KVMState *s, EventNotifier *n,
EventNotifier *rn, qemu_irq irq)
{
gpointer key, gsi;
gboolean found = g_hash_table_lookup_extended(s->gsimap, irq, &key, &gsi);
if (!found) {
return -ENXIO;
}
return kvm_irqchip_add_irqfd_notifier_gsi(s, n, rn, GPOINTER_TO_INT(gsi));
}
int kvm_irqchip_remove_irqfd_notifier(KVMState *s, EventNotifier *n,
qemu_irq irq)
{
gpointer key, gsi;
gboolean found = g_hash_table_lookup_extended(s->gsimap, irq, &key, &gsi);
if (!found) {
return -ENXIO;
}
return kvm_irqchip_remove_irqfd_notifier_gsi(s, n, GPOINTER_TO_INT(gsi));
}
void kvm_irqchip_set_qemuirq_gsi(KVMState *s, qemu_irq irq, int gsi)
{
g_hash_table_insert(s->gsimap, irq, GINT_TO_POINTER(gsi));
}
static int kvm_irqchip_create(MachineState *machine, KVMState *s)
{
int ret;
@ -1374,6 +1405,8 @@ static int kvm_irqchip_create(MachineState *machine, KVMState *s)
kvm_init_irq_routing(s);
s->gsimap = g_hash_table_new(g_direct_hash, g_direct_equal);
return 0;
}