Trying to start a domain with a qdisk backend on an old dom0 kernel
(non-pvops xen kernel) will fail as xengnttab_set_max_grants() will
succeed only if called directly after opening the gnttab device.
These two patches address the issue by:
- moving the test for availability of xengnttab_grant_copy() from
the qdisk backend to generic backend handling in order to not have
to issue the grant copy ioctl with the qdisk specific file handle
- opening the gnttab device in blk_connect() only in order to
guarantee xengnttab_set_max_grants() is called just after opening
the gnttab device
Juergen Gross (2):
xen: add a global indicator for grant copy being available
xen: dont try setting max grants multiple times
hw/block/xen_disk.c | 34 ++++++++++++++++++----------------
hw/xen/xen_backend.c | 11 +++++++++++
include/hw/xen/xen_backend.h | 1 +
3 files changed, 30 insertions(+), 16 deletions(-)
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2.12.3