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s390/uv: Fix handling of length extensions 

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: 5abb9351df ("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>
This commit is contained in:
Christian Borntraeger 2020-02-10 11:27:37 -05:00 committed by Vasily Gorbik
parent 2c25b3f68e
commit 27dc0700c3
1 changed files with 2 additions and 1 deletions
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3
arch/s390/boot/uv.c
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@ -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) &&