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kvm/msi: do explicit commit when adding msi routes

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We invoke the kvm_irqchip_commit_routes() for each addition to MSI route
table, which is not efficient if we are adding lots of routes in some cases.

This patch lets callers invoke the kvm_irqchip_commit_routes(), so the
callers can decide how to optimize.

[1] https://lists.gnu.org/archive/html/qemu-devel/2021-11/msg00967.html

Signed-off-by: Longpeng <longpeng2@huawei.com>
Message-Id: <20220222141116.2091-3-longpeng2@huawei.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Longpeng(Mike) 2022-02-22 22:11:16 +08:00 • committed by Paolo Bonzini
parent 9568690868
commit def4c5570c
7 changed files with 21 additions and 10 deletions
Download patch file Download diff file Expand all files Collapse all files

7
accel/kvm/kvm-all.c
View file

@ -1961,10 +1961,11 @@ int kvm_irqchip_send_msi(KVMState *s, MSIMessage msg)
return kvm_set_irq(s, route->kroute.gsi, 1);
}
int kvm_irqchip_add_msi_route(KVMState *s, int vector, PCIDevice *dev)
int kvm_irqchip_add_msi_route(KVMRouteChange *c, int vector, PCIDevice *dev)
{
struct kvm_irq_routing_entry kroute = {};
int virq;
KVMState *s = c->s;
MSIMessage msg = {0, 0};
if (pci_available && dev) {
@ -2004,7 +2005,7 @@ int kvm_irqchip_add_msi_route(KVMState *s, int vector, PCIDevice *dev)
kvm_add_routing_entry(s, &kroute);
kvm_arch_add_msi_route_post(&kroute, vector, dev);
kvm_irqchip_commit_routes(s);
c->changes++;
return virq;
}
@ -2162,7 +2163,7 @@ int kvm_irqchip_send_msi(KVMState *s, MSIMessage msg)
abort();
}
int kvm_irqchip_add_msi_route(KVMState *s, int vector, PCIDevice *dev)
int kvm_irqchip_add_msi_route(KVMRouteChange *c, int vector, PCIDevice *dev)
{
return -ENOSYS;
}