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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

5
hw/misc/ivshmem.c
View file

@ -424,16 +424,19 @@ static void ivshmem_add_kvm_msi_virq(IVShmemState *s, int vector,
Error **errp)
{
PCIDevice *pdev = PCI_DEVICE(s);
KVMRouteChange c;
int ret;
IVSHMEM_DPRINTF("ivshmem_add_kvm_msi_virq vector:%d\n", vector);
assert(!s->msi_vectors[vector].pdev);
ret = kvm_irqchip_add_msi_route(kvm_state, vector, pdev);
c = kvm_irqchip_begin_route_changes(kvm_state);
ret = kvm_irqchip_add_msi_route(&c, vector, pdev);
if (ret < 0) {
error_setg(errp, "kvm_irqchip_add_msi_route failed");
return;
}
kvm_irqchip_commit_route_changes(&c);
s->msi_vectors[vector].virq = ret;
s->msi_vectors[vector].pdev = pdev;

5
hw/vfio/pci.c
View file

@ -412,6 +412,7 @@ static int vfio_enable_vectors(VFIOPCIDevice *vdev, bool msix)
static void vfio_add_kvm_msi_virq(VFIOPCIDevice *vdev, VFIOMSIVector *vector,
int vector_n, bool msix)
{
KVMRouteChange c;
int virq;
if ((msix && vdev->no_kvm_msix) || (!msix && vdev->no_kvm_msi)) {
@ -422,11 +423,13 @@ static void vfio_add_kvm_msi_virq(VFIOPCIDevice *vdev, VFIOMSIVector *vector,
return;
}
virq = kvm_irqchip_add_msi_route(kvm_state, vector_n, &vdev->pdev);
c = kvm_irqchip_begin_route_changes(kvm_state);
virq = kvm_irqchip_add_msi_route(&c, vector_n, &vdev->pdev);
if (virq < 0) {
event_notifier_cleanup(&vector->kvm_interrupt);
return;
}
kvm_irqchip_commit_route_changes(&c);
if (kvm_irqchip_add_irqfd_notifier_gsi(kvm_state, &vector->kvm_interrupt,
NULL, virq) < 0) {

4
hw/virtio/virtio-pci.c
View file

@ -683,10 +683,12 @@ static int kvm_virtio_pci_vq_vector_use(VirtIOPCIProxy *proxy,
int ret;
if (irqfd->users == 0) {
ret = kvm_irqchip_add_msi_route(kvm_state, vector, &proxy->pci_dev);
KVMRouteChange c = kvm_irqchip_begin_route_changes(kvm_state);
ret = kvm_irqchip_add_msi_route(&c, vector, &proxy->pci_dev);
if (ret < 0) {
return ret;
}
kvm_irqchip_commit_route_changes(&c);
irqfd->virq = ret;
}
irqfd->users++;