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kvm tools: Use ioeventfd in virtio-blk

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Use ioeventfds to receive notifications of IO events in virtio-blk.
Doing so prevents an exit every time we read/write from/to the
virtio disk.

Signed-off-by: Sasha Levin <levinsasha928@gmail.com>
Signed-off-by: Pekka Enberg <penberg@kernel.org>
This commit is contained in:
Sasha Levin
2015-06-01 16:39:44 +01:00
committed by Will Deacon
parent 37f3d50e6a
commit ec75b82fc0
1 changed files with 25 additions and 1 deletions
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virtio/blk.c
+25 -1
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@@ -10,6 +10,7 @@
#include "kvm/kvm.h"
#include "kvm/pci.h"
#include "kvm/threadpool.h"
#include "kvm/ioeventfd.h"
#include <linux/virtio_ring.h>
#include <linux/virtio_blk.h>
@@ -243,11 +244,19 @@ static struct ioport_operations virtio_blk_io_ops = {
.io_out = virtio_blk_pci_io_out,
};
static void ioevent_callback(struct kvm *kvm, void *param)
{
struct blk_dev_job *job = param;
thread_pool__do_job(job->job_id);
}
void virtio_blk__init(struct kvm *kvm, struct disk_image *disk)
{
u16 blk_dev_base_addr;
u8 dev, pin, line;
u8 dev, pin, line, i;
struct blk_dev *bdev;
struct ioevent ioevent;
if (!disk)
return;
@@ -293,6 +302,20 @@ void virtio_blk__init(struct kvm *kvm, struct disk_image *disk)
bdev->pci_hdr.irq_line = line;
pci__register(&bdev->pci_hdr, dev);
for (i = 0; i < NUM_VIRT_QUEUES; i++) {
ioevent = (struct ioevent) {
.io_addr = blk_dev_base_addr + VIRTIO_PCI_QUEUE_NOTIFY,
.io_len = sizeof(u16),
.fn = ioevent_callback,
.datamatch = i,
.fn_ptr = &bdev->jobs[i],
.fn_kvm = kvm,
.fd = eventfd(0, 0),
};
ioeventfd__add_event(&ioevent);
}
}
void virtio_blk__init_all(struct kvm *kvm)
@@ -309,6 +332,7 @@ void virtio_blk__delete_all(struct kvm *kvm)
struct blk_dev *bdev;
bdev = list_first_entry(&bdevs, struct blk_dev, list);
ioeventfd__del_event(bdev->base_addr + VIRTIO_PCI_QUEUE_NOTIFY, 0);
list_del(&bdev->list);
free(bdev);
}