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hw/xen: Add evtchn operations to allow redirection to internal emulation

Browse source 
The existing implementation calling into the real libxenevtchn moves to
a new file hw/xen/xen-operations.c, and is called via a function table
which in a subsequent commit will also be able to invoke the emulated
event channel support.

Signed-off-by: David Woodhouse <dwmw@amazon.co.uk>
Reviewed-by: Paul Durrant <paul@xen.org>
This commit is contained in:
David Woodhouse 2023-01-01 17:54:41 +00:00
parent 831b0db8ab
commit b6cacfea0b
13 changed files with 242 additions and 57 deletions
Download patch file Download diff file Expand all files Collapse all files

22
hw/xen/xen-bus.c
View file

@ -1095,12 +1095,12 @@ static bool xen_device_poll(void *opaque)
static void xen_device_event(void *opaque)
{
XenEventChannel *channel = opaque;
unsigned long port = xenevtchn_pending(channel->xeh);
unsigned long port = qemu_xen_evtchn_pending(channel->xeh);
if (port == channel->local_port) {
xen_device_poll(channel);
xenevtchn_unmask(channel->xeh, port);
qemu_xen_evtchn_unmask(channel->xeh, port);
}
}
@ -1115,11 +1115,11 @@ void xen_device_set_event_channel_context(XenDevice *xendev,
}
if (channel->ctx)
aio_set_fd_handler(channel->ctx, xenevtchn_fd(channel->xeh), true,
aio_set_fd_handler(channel->ctx, qemu_xen_evtchn_fd(channel->xeh), true,
NULL, NULL, NULL, NULL, NULL);
channel->ctx = ctx;
aio_set_fd_handler(channel->ctx, xenevtchn_fd(channel->xeh), true,
aio_set_fd_handler(channel->ctx, qemu_xen_evtchn_fd(channel->xeh), true,
xen_device_event, NULL, xen_device_poll, NULL, channel);
}
@ -1131,13 +1131,13 @@ XenEventChannel *xen_device_bind_event_channel(XenDevice *xendev,
XenEventChannel *channel = g_new0(XenEventChannel, 1);
xenevtchn_port_or_error_t local_port;
channel->xeh = xenevtchn_open(NULL, 0);
channel->xeh = qemu_xen_evtchn_open();
if (!channel->xeh) {
error_setg_errno(errp, errno, "failed xenevtchn_open");
goto fail;
}
local_port = xenevtchn_bind_interdomain(channel->xeh,
local_port = qemu_xen_evtchn_bind_interdomain(channel->xeh,
xendev->frontend_id,
port);
if (local_port < 0) {
@ -1160,7 +1160,7 @@ XenEventChannel *xen_device_bind_event_channel(XenDevice *xendev,
fail:
if (channel->xeh) {
xenevtchn_close(channel->xeh);
qemu_xen_evtchn_close(channel->xeh);
}
g_free(channel);
@ -1177,7 +1177,7 @@ void xen_device_notify_event_channel(XenDevice *xendev,
return;
}
if (xenevtchn_notify(channel->xeh, channel->local_port) < 0) {
if (qemu_xen_evtchn_notify(channel->xeh, channel->local_port) < 0) {
error_setg_errno(errp, errno, "xenevtchn_notify failed");
}
}
@ -1193,14 +1193,14 @@ void xen_device_unbind_event_channel(XenDevice *xendev,
QLIST_REMOVE(channel, list);
aio_set_fd_handler(channel->ctx, xenevtchn_fd(channel->xeh), true,
aio_set_fd_handler(channel->ctx, qemu_xen_evtchn_fd(channel->xeh), true,
NULL, NULL, NULL, NULL, NULL);
if (xenevtchn_unbind(channel->xeh, channel->local_port) < 0) {
if (qemu_xen_evtchn_unbind(channel->xeh, channel->local_port) < 0) {
error_setg_errno(errp, errno, "xenevtchn_unbind failed");
}
xenevtchn_close(channel->xeh);
qemu_xen_evtchn_close(channel->xeh);
g_free(channel);
}