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* [PATCH v2 37/42] s390/uv: Fix handling of length extensions (already in s390 tree)
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@ 2020-02-14 22:26 ` Christian Borntraeger
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From: Christian Borntraeger @ 2020-02-14 22:26 UTC (permalink / raw)
  To: Christian Borntraeger, Janosch Frank
  Cc: KVM, Cornelia Huck, David Hildenbrand, Thomas Huth,
	Ulrich Weigand, Claudio Imbrenda, linux-s390, Michael Mueller,
	Vasily Gorbik, stable

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.

Fixes: 5abb9351dfd9 ("s390/uv: introduce guest side ultravisor code")
Signed-off-by: Christian Borntraeger <>
 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))
-	if (uv_call(0, (uint64_t)&uvcb))
+	if (uv_call(0, (uint64_t)&uvcb) && uvcb.header.rc != 0x100)

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2020-02-14 22:26 ` [PATCH v2 37/42] s390/uv: Fix handling of length extensions (already in s390 tree) Christian Borntraeger

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