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[Qemu-devel] [PATCH v4 7/8] kvm: Add support for direct MSI injections
From: |
Jan Kiszka |
Subject: |
[Qemu-devel] [PATCH v4 7/8] kvm: Add support for direct MSI injections |
Date: |
Wed, 16 May 2012 15:41:14 -0300 |
If the kernel supports KVM_SIGNAL_MSI, we can avoid the route-based
MSI injection mechanism.
Signed-off-by: Jan Kiszka <address@hidden>
---
kvm-all.c | 22 +++++++++++++++++++---
1 files changed, 19 insertions(+), 3 deletions(-)
diff --git a/kvm-all.c b/kvm-all.c
index ff0534b..d222012 100644
--- a/kvm-all.c
+++ b/kvm-all.c
@@ -96,6 +96,7 @@ struct KVMState
uint32_t *used_gsi_bitmap;
unsigned int gsi_count;
QTAILQ_HEAD(msi_hashtab, KVMMSIRoute) msi_hashtab[KVM_MSI_HASHTAB_SIZE];
+ bool direct_msi;
#endif
};
@@ -898,8 +899,10 @@ static void kvm_init_irq_routing(KVMState *s)
s->irq_routes = g_malloc0(sizeof(*s->irq_routes));
s->nr_allocated_irq_routes = 0;
- for (i = 0; i < KVM_MSI_HASHTAB_SIZE; i++) {
- QTAILQ_INIT(&s->msi_hashtab[i]);
+ if (!s->direct_msi) {
+ for (i = 0; i < KVM_MSI_HASHTAB_SIZE; i++) {
+ QTAILQ_INIT(&s->msi_hashtab[i]);
+ }
}
kvm_arch_init_irq_routing(s);
@@ -1005,7 +1008,7 @@ again:
return bit - 1 + i * 32;
}
- if (retry) {
+ if (!s->direct_msi && retry) {
retry = false;
kvm_flush_dynamic_msi_routes(s);
goto again;
@@ -1031,8 +1034,19 @@ static KVMMSIRoute *kvm_lookup_msi_route(KVMState *s,
MSIMessage msg)
int kvm_irqchip_send_msi(KVMState *s, MSIMessage msg)
{
+ struct kvm_msi msi;
KVMMSIRoute *route;
+ if (s->direct_msi) {
+ msi.address_lo = (uint32_t)msg.address;
+ msi.address_hi = msg.address >> 32;
+ msi.data = msg.data;
+ msi.flags = 0;
+ memset(msi.pad, 0, sizeof(msi.pad));
+
+ return kvm_vm_ioctl(s, KVM_SIGNAL_MSI, &msi);
+ }
+
route = kvm_lookup_msi_route(s, msg);
if (!route) {
int virq, ret;
@@ -1209,6 +1223,8 @@ int kvm_init(void)
s->pit_state2 = kvm_check_extension(s, KVM_CAP_PIT_STATE2);
#endif
+ s->direct_msi = (kvm_check_extension(s, KVM_CAP_SIGNAL_MSI) > 0);
+
ret = kvm_arch_init(s);
if (ret < 0) {
goto err;
--
1.7.3.4
- [Qemu-devel] [PATCH v4 0/8] uq/master: MSI support for in-kernel irqchip mode, Jan Kiszka, 2012/05/16
- [Qemu-devel] [PATCH v4 1/8] kvm: Refactor KVMState::max_gsi to gsi_count, Jan Kiszka, 2012/05/16
- [Qemu-devel] [PATCH v4 2/8] Introduce MSIMessage structure, Jan Kiszka, 2012/05/16
- [Qemu-devel] [PATCH v4 3/8] kvm: Introduce basic MSI support for in-kernel irqchips, Jan Kiszka, 2012/05/16
- [Qemu-devel] [PATCH v4 4/8] pc: Enable MSI support at APIC level, Jan Kiszka, 2012/05/16
- [Qemu-devel] [PATCH v4 5/8] kvm: x86: Wire up MSI support for in-kernel irqchip, Jan Kiszka, 2012/05/16
- [Qemu-devel] [PATCH v4 7/8] kvm: Add support for direct MSI injections,
Jan Kiszka <=
- [Qemu-devel] [PATCH v4 6/8] kvm: Update kernel headers, Jan Kiszka, 2012/05/16
- [Qemu-devel] [PATCH v4 8/8] kvm: Enable in-kernel irqchip support by default, Jan Kiszka, 2012/05/16