From: Christian Borntraeger borntraeger@de.ibm.com
commit 27dc0700c3be7c681cea03c5230b93d02f623492 upstream.
The query parameter block might contain additional information and can be extended in the future. If the size of the block does not suffice we get an error code of rc=0x100. The buffer will contain all information up to the specified size and the hypervisor/guest simply do not need the additional information as they do not know about the new data. That means that we can (and must) accept rc=0x100 as success.
Cc: stable@vger.kernel.org Reviewed-by: Cornelia Huck cohuck@redhat.com Fixes: 5abb9351dfd9 ("s390/uv: introduce guest side ultravisor code") Signed-off-by: Christian Borntraeger borntraeger@de.ibm.com Signed-off-by: Vasily Gorbik gor@linux.ibm.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org
--- arch/s390/boot/uv.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-)
--- a/arch/s390/boot/uv.c +++ b/arch/s390/boot/uv.c @@ -15,7 +15,8 @@ void uv_query_info(void) if (!test_facility(158)) return;
- if (uv_call(0, (uint64_t)&uvcb)) + /* rc==0x100 means that there is additional data we do not process */ + if (uv_call(0, (uint64_t)&uvcb) && uvcb.header.rc != 0x100) return;
if (test_bit_inv(BIT_UVC_CMD_SET_SHARED_ACCESS, (unsigned long *)uvcb.inst_calls_list) &&