diff options
| author | David Woodhouse <dwmw@amazon.co.uk> | 2021-01-13 13:26:02 +0000 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2021-01-27 11:47:44 +0100 |
| commit | a09d4e7acdbf276b2096661ee82454ae3dd24d2b (patch) | |
| tree | 29744880779cd8879c0965159ebd86be1b4b52a4 /include/xen | |
| parent | acc402fa5bf502d471d50e3d495379f093a7f9e4 (diff) | |
xen: Fix event channel callback via INTX/GSI
[ Upstream commit 3499ba8198cad47b731792e5e56b9ec2a78a83a2 ]
For a while, event channel notification via the PCI platform device
has been broken, because we attempt to communicate with xenstore before
we even have notifications working, with the xs_reset_watches() call
in xs_init().
We tend to get away with this on Xen versions below 4.0 because we avoid
calling xs_reset_watches() anyway, because xenstore might not cope with
reading a non-existent key. And newer Xen *does* have the vector
callback support, so we rarely fall back to INTX/GSI delivery.
To fix it, clean up a bit of the mess of xs_init() and xenbus_probe()
startup. Call xs_init() directly from xenbus_init() only in the !XS_HVM
case, deferring it to be called from xenbus_probe() in the XS_HVM case
instead.
Then fix up the invocation of xenbus_probe() to happen either from its
device_initcall if the callback is available early enough, or when the
callback is finally set up. This means that the hack of calling
xenbus_probe() from a workqueue after the first interrupt, or directly
from the PCI platform device setup, is no longer needed.
Signed-off-by: David Woodhouse <dwmw@amazon.co.uk>
Reviewed-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>
Link: https://lore.kernel.org/r/20210113132606.422794-2-dwmw2@infradead.org
Signed-off-by: Juergen Gross <jgross@suse.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Diffstat (limited to 'include/xen')
| -rw-r--r-- | include/xen/xenbus.h | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/include/xen/xenbus.h b/include/xen/xenbus.h index eba01ab5a55e..fe9a9fa2ebc4 100644 --- a/include/xen/xenbus.h +++ b/include/xen/xenbus.h @@ -187,7 +187,7 @@ void xs_suspend_cancel(void); struct work_struct; -void xenbus_probe(struct work_struct *); +void xenbus_probe(void); #define XENBUS_IS_ERR_READ(str) ({ \ if (!IS_ERR(str) && strlen(str) == 0) { \ |