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[Qemu-devel] [PATCH v3 3/3] virtio-mmio: start ioeventfd when status get
From: |
Pavel Fedin |
Subject: |
[Qemu-devel] [PATCH v3 3/3] virtio-mmio: start ioeventfd when status gets DRIVER_OK |
Date: |
Tue, 12 May 2015 11:10:52 +0300 |
From: Ying-Shiuan Pan <address@hidden>
Signed-off-by: Ying-Shiuan Pan <address@hidden>
Signed-off-by: Pavel Fedin <address@hidden>
---
hw/virtio/virtio-mmio.c | 47 +++++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 47 insertions(+)
diff --git a/hw/virtio/virtio-mmio.c b/hw/virtio/virtio-mmio.c
index a4c4d89..c12d3fc 100644
--- a/hw/virtio/virtio-mmio.c
+++ b/hw/virtio/virtio-mmio.c
@@ -22,6 +22,7 @@
#include "hw/sysbus.h"
#include "hw/virtio/virtio.h"
#include "qemu/host-utils.h"
+#include "sysemu/kvm.h"
#include "hw/virtio/virtio-bus.h"
#include "qemu/error-report.h"
@@ -120,6 +121,43 @@ static int
virtio_mmio_set_host_notifier_internal(VirtIOMMIOProxy *proxy,
return r;
}
+static void virtio_mmio_start_ioeventfd(VirtIOMMIOProxy *proxy)
+{
+ VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus);
+ int n, r;
+
+ if (!kvm_eventfds_enabled() ||
+ proxy->ioeventfd_disabled ||
+ proxy->ioeventfd_started) {
+ return;
+ }
+
+ for (n = 0; n < VIRTIO_PCI_QUEUE_MAX; n++) {
+ if (!virtio_queue_get_num(vdev, n)) {
+ continue;
+ }
+
+ r = virtio_mmio_set_host_notifier_internal(proxy, n, true, true);
+ if (r < 0) {
+ goto assign_error;
+ }
+ }
+ proxy->ioeventfd_started = true;
+ return;
+
+assign_error:
+ while (--n >= 0) {
+ if (!virtio_queue_get_num(vdev, n)) {
+ continue;
+ }
+
+ r = virtio_mmio_set_host_notifier_internal(proxy, n, false, false);
+ assert(r >= 0);
+ }
+ proxy->ioeventfd_started = false;
+ error_report("%s: failed. Fallback to a userspace (slower).", __func__);
+}
+
static void virtio_mmio_stop_ioeventfd(VirtIOMMIOProxy *proxy)
{
int r;
@@ -318,7 +356,16 @@ static void virtio_mmio_write(void *opaque, hwaddr offset,
uint64_t value,
virtio_update_irq(vdev);
break;
case VIRTIO_MMIO_STATUS:
+ if (!(value & VIRTIO_CONFIG_S_DRIVER_OK)) {
+ virtio_mmio_stop_ioeventfd(proxy);
+ }
+
virtio_set_status(vdev, value & 0xff);
+
+ if (value & VIRTIO_CONFIG_S_DRIVER_OK) {
+ virtio_mmio_start_ioeventfd(proxy);
+ }
+
if (vdev->status == 0) {
virtio_reset(vdev);
}
--
1.9.5.msysgit.0