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 Fixes: 5abb9351dfd9 ("s390/uv: introduce guest side ultravisor code") Signed-off-by: Christian Borntraeger borntraeger@de.ibm.com --- arch/s390/boot/uv.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/arch/s390/boot/uv.c b/arch/s390/boot/uv.c index af9e1cc93c68..c003593664cd 100644 --- a/arch/s390/boot/uv.c +++ b/arch/s390/boot/uv.c @@ -21,7 +21,7 @@ void uv_query_info(void) if (!test_facility(158)) return;
- if (uv_call(0, (uint64_t)&uvcb)) + if (uv_call(0, (uint64_t)&uvcb) && uvcb.header.rc != 0x100) return;
if (IS_ENABLED(CONFIG_KVM)) {