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xen: fix xen-bus state model to allow frontend re-connection

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There is a flaw in the xen-bus state model. To allow a frontend to re-
connect the backend state of an online XenDevice is transitioned from
Closed to InitWait, but this is currently done unilaterally which is
incorrect. The backend state should remain Closed until the frontend state
transitions to Initialising.

This patch removes the automatic backend state transition from
xen_device_backend_state_changed() and, instead, adds an extra check in
xen_device_frontend_state_changed() to determine whether a frontend is
trying to re-connect to a previously Closed XenDevice. Only if this is
found to be the case is the backend state transitioned from Closed to
InitWait. Note that this transition will be common amongst all XenDevice
classes and hence xen_device_frontend_state_changed() returns immediately
afterwards without calling into the XenDeviceClass frontend_changed()
method.

Signed-off-by: Paul Durrant <paul.durrant@citrix.com>
Acked-by: Anthony PERARD <anthony.perard@citrix.com>
Signed-off-by: Anthony PERARD <anthony.perard@citrix.com>
This commit is contained in:
Paul Durrant 2019-01-22 15:53:46 +00:00 committed by Anthony PERARD
parent 17d8825d08
commit 67bc8e00f7
1 changed files with 19 additions and 13 deletions
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32
hw/xen/xen-bus.c
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@ -547,20 +547,15 @@ static void xen_device_backend_changed(void *opaque)
}
/*
* If a backend is still 'online' then its state should be cycled
* back round to InitWait in order for a new frontend instance to
* connect. This may happen when, for example, a frontend driver is
* re-installed or updated.
* If a backend is not 'online' then the device should be destroyed.
* If a backend is still 'online' then we should leave it alone but,
* if a backend is not 'online', then the device should be destroyed
* once the state is Closed.
*/
if (xendev->backend_online &&
xendev->backend_state == XenbusStateClosed) {
xen_device_backend_set_state(xendev, XenbusStateInitWait);
} else if (!xendev->backend_online &&
(xendev->backend_state == XenbusStateClosed ||
xendev->backend_state == XenbusStateInitialising ||
xendev->backend_state == XenbusStateInitWait ||
xendev->backend_state == XenbusStateUnknown)) {
if (!xendev->backend_online &&
(xendev->backend_state == XenbusStateClosed ||
xendev->backend_state == XenbusStateInitialising ||
xendev->backend_state == XenbusStateInitWait ||
xendev->backend_state == XenbusStateUnknown)) {
Error *local_err = NULL;
if (!xen_backend_try_device_destroy(xendev, &local_err)) {
@ -715,6 +710,17 @@ static void xen_device_frontend_changed(void *opaque)
xen_device_frontend_set_state(xendev, state);
if (state == XenbusStateInitialising &&
xendev->backend_state == XenbusStateClosed &&
xendev->backend_online) {
/*
* The frontend is re-initializing so switch back to
* InitWait.
*/
xen_device_backend_set_state(xendev, XenbusStateInitWait);
return;
}
if (xendev_class->frontend_changed) {
Error *local_err = NULL;