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kvm tools: Use ioeventfd in virtio-9p

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Use ioeventfd to receive virt queue notifications within virtio-9p.
This should prevent exits on 9p commands.

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 16:39:45 +01:00
committed by Will Deacon
parent ea7016a99a
commit 60eb42d572
1 changed files with 23 additions and 0 deletions
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virtio/9p.c
+23
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@@ -8,6 +8,7 @@
#include "kvm/pci.h"
#include "kvm/threadpool.h"
#include "kvm/irq.h"
#include "kvm/ioeventfd.h"
#include <linux/virtio_ring.h>
#include <linux/virtio_9p.h>
@@ -605,12 +606,20 @@ static void virtio_p9_do_io(struct kvm *kvm, void *param)
}
}
static void ioevent_callback(struct kvm *kvm, void *param)
{
struct p9_dev_job *job = param;
thread_pool__do_job(job->job_id);
}
static bool virtio_p9_pci_io_out(struct ioport *ioport, struct kvm *kvm,
u16 port, void *data, int size, u32 count)
{
unsigned long offset;
bool ret = true;
struct p9_dev *p9dev;
struct ioevent ioevent;
p9dev = ioport->priv;
offset = port - p9dev->base_addr;
@@ -637,6 +646,19 @@ static bool virtio_p9_pci_io_out(struct ioport *ioport, struct kvm *kvm,
.p9dev = p9dev,
};
job->job_id = thread_pool__add_job(kvm, virtio_p9_do_io, job);
ioevent = (struct ioevent) {
.io_addr = p9dev->base_addr + VIRTIO_PCI_QUEUE_NOTIFY,
.io_len = sizeof(u16),
.fn = ioevent_callback,
.datamatch = p9dev->queue_selector,
.fn_ptr = &p9dev->jobs[p9dev->queue_selector],
.fn_kvm = kvm,
.fd = eventfd(0, 0),
};
ioeventfd__add_event(&ioevent);
break;
}
case VIRTIO_PCI_QUEUE_SEL:
@@ -644,6 +666,7 @@ static bool virtio_p9_pci_io_out(struct ioport *ioport, struct kvm *kvm,
break;
case VIRTIO_PCI_QUEUE_NOTIFY: {
u16 queue_index;
queue_index = ioport__read16(data);
thread_pool__do_job(p9dev->jobs[queue_index].job_id);
break;