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kvm: x86: Wire up MSI support for in-kernel irqchip 

Catch writes to the MSI MMIO region in the KVM APIC and forward them to
the kernel. Provide the kernel support GSI routing, this allows to
enable MSI support also for in-kernel irqchip mode.

Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
This commit is contained in:
Jan Kiszka 2012-05-16 15:41:12 -03:00 committed by Marcelo Tosatti
parent 08a82ac01c
commit ffb8d4296e
1 changed files with 32 additions and 2 deletions
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34
hw/kvm/apic.c
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@ -10,6 +10,7 @@
* See the COPYING file in the top-level directory.
*/
#include "hw/apic_internal.h"
#include "hw/msi.h"
#include "kvm.h"
static inline void kvm_apic_set_reg(struct kvm_lapic_state *kapic,
@ -145,10 +146,39 @@ static void kvm_apic_external_nmi(APICCommonState *s)
run_on_cpu(s->cpu_env, do_inject_external_nmi, s);
}
static uint64_t kvm_apic_mem_read(void *opaque, target_phys_addr_t addr,
unsigned size)
{
return ~(uint64_t)0;
}
static void kvm_apic_mem_write(void *opaque, target_phys_addr_t addr,
uint64_t data, unsigned size)
{
MSIMessage msg = { .address = addr, .data = data };
int ret;
ret = kvm_irqchip_send_msi(kvm_state, msg);
if (ret < 0) {
fprintf(stderr, "KVM: injection failed, MSI lost (%s)\n",
strerror(-ret));
}
}
static const MemoryRegionOps kvm_apic_io_ops = {
.read = kvm_apic_mem_read,
.write = kvm_apic_mem_write,
.endianness = DEVICE_NATIVE_ENDIAN,
};
static void kvm_apic_init(APICCommonState *s)
{
memory_region_init_reservation(&s->io_memory, "kvm-apic-msi",
MSI_SPACE_SIZE);
memory_region_init_io(&s->io_memory, &kvm_apic_io_ops, s, "kvm-apic-msi",
MSI_SPACE_SIZE);
if (kvm_has_gsi_routing()) {
msi_supported = true;
}
}
static void kvm_apic_class_init(ObjectClass *klass, void *data)