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 | 30 +++++++++++++++++------------- hw/xen/xen_backend.c | 11 +++++++++++ include/hw/xen/xen_backend.h | 1 + 3 files changed, 29 insertions(+), 13 deletions(-) -- 2.12.3 _______________________________________________ Xen-devel mailing list Xen-devel@lists.xen.org https://lists.xen.org/xen-devel
