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hw/virtio: enable ioeventfd configuring for mmio 

This patch adds ioeventfd flag for virtio-mmio configuration.
It allows switching ioeventfd on and off.

Signed-off-by: Pavel Dovgalyuk <Pavel.Dovgalyuk@ispras.ru>
Message-Id: <161700379211.1135943.8859209566937991305.stgit@pasha-ThinkPad-X280>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
This commit is contained in:
Pavel Dovgalyuk 2021-03-29 10:43:12 +03:00 committed by Michael S. Tsirkin
parent 05dfb447a4
commit b8893a3c86
2 changed files with 15 additions and 1 deletions
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11
hw/virtio/virtio-mmio.c
View File

@ -36,7 +36,9 @@
static bool virtio_mmio_ioeventfd_enabled(DeviceState *d)
{
return kvm_eventfds_enabled();
VirtIOMMIOProxy *proxy = VIRTIO_MMIO(d);
return (proxy->flags & VIRTIO_IOMMIO_FLAG_USE_IOEVENTFD) != 0;
}
static int virtio_mmio_ioeventfd_assign(DeviceState *d,
@ -720,6 +722,8 @@ static Property virtio_mmio_properties[] = {
DEFINE_PROP_BOOL("format_transport_address", VirtIOMMIOProxy,
format_transport_address, true),
DEFINE_PROP_BOOL("force-legacy", VirtIOMMIOProxy, legacy, true),
DEFINE_PROP_BIT("ioeventfd", VirtIOMMIOProxy, flags,
VIRTIO_IOMMIO_FLAG_USE_IOEVENTFD_BIT, true),
DEFINE_PROP_END_OF_LIST(),
};
@ -731,6 +735,11 @@ static void virtio_mmio_realizefn(DeviceState *d, Error **errp)
qbus_create_inplace(&proxy->bus, sizeof(proxy->bus), TYPE_VIRTIO_MMIO_BUS,
d, NULL);
sysbus_init_irq(sbd, &proxy->irq);
if (!kvm_eventfds_enabled()) {
proxy->flags &= ~VIRTIO_IOMMIO_FLAG_USE_IOEVENTFD;
}
if (proxy->legacy) {
memory_region_init_io(&proxy->iomem, OBJECT(d),
&virtio_legacy_mem_ops, proxy,

5
include/hw/virtio/virtio-mmio.h
View File

@ -49,12 +49,17 @@ typedef struct VirtIOMMIOQueue {
uint32_t used[2];
} VirtIOMMIOQueue;
#define VIRTIO_IOMMIO_FLAG_USE_IOEVENTFD_BIT 1
#define VIRTIO_IOMMIO_FLAG_USE_IOEVENTFD \
(1 << VIRTIO_IOMMIO_FLAG_USE_IOEVENTFD_BIT)
struct VirtIOMMIOProxy {
/* Generic */
SysBusDevice parent_obj;
MemoryRegion iomem;
qemu_irq irq;
bool legacy;
uint32_t flags;
/* Guest accessible state needing migration and reset */
uint32_t host_features_sel;
uint32_t guest_features_sel;