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virtio: support setting memory region based host notifier

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This patch introduces the support for setting memory region
based host notifiers for virtio device. This is helpful when
using a hardware accelerator for a virtio device, because
hardware heavily depends on the notification, this will allow
the guest driver in the VM to notify the hardware directly.

Signed-off-by: Tiwei Bie <tiwei.bie@intel.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
This commit is contained in:
Tiwei Bie 2018-04-12 23:12:30 +08:00 • committed by Michael S. Tsirkin
parent 1f3a4519b1
commit 6f80e6170e
4 changed files with 39 additions and 0 deletions
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2
include/hw/virtio/virtio-bus.h
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@ -52,6 +52,8 @@ typedef struct VirtioBusClass {
bool (*has_extra_state)(DeviceState *d);
bool (*query_guest_notifiers)(DeviceState *d);
int (*set_guest_notifiers)(DeviceState *d, int nvqs, bool assign);
int (*set_host_notifier_mr)(DeviceState *d, int n,
MemoryRegion *mr, bool assign);
void (*vmstate_change)(DeviceState *d, bool running);
/*
* Expose the features the transport layer supports before