Disable SMAP in the shim before bouncing the hypercall, or else L0 will fail to get the hypercall buffer.
Signed-off-by: Roger Pau Monné <roger....@citrix.com> Reported-by: Fatih Acar <fatih.a...@gandi.net> --- Cc: Jan Beulich <jbeul...@suse.com> Cc: Andrew Cooper <andrew.coop...@citrix.com> Cc: Ian Jackson <ian.jack...@eu.citrix.com> Cc: Wei Liu <wei.l...@citrix.com> --- Needs to be backported to the 4.10.0-shim-comet branch. --- xen/arch/x86/pv/shim.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/xen/arch/x86/pv/shim.c b/xen/arch/x86/pv/shim.c index d5383dcfc7..eb1ee7d3c4 100644 --- a/xen/arch/x86/pv/shim.c +++ b/xen/arch/x86/pv/shim.c @@ -748,7 +748,10 @@ static long pv_shim_grant_table_op(unsigned int cmd, } case GNTTABOP_query_size: + /* Disable SMAP so L0 can access the buffer. */ + stac(); rc = xen_hypercall_grant_table_op(GNTTABOP_query_size, uop.p, count); + clac(); break; default: -- 2.15.1 _______________________________________________ Xen-devel mailing list Xen-devel@lists.xenproject.org https://lists.xenproject.org/mailman/listinfo/xen-devel