[PATCH v1 1/6] s390/boot/uv.c: Use a constant for more-data rc

Steffen Eiden
2024-09-30T13:19:18Z

Add a define for the UVC rc 0x0100 that indicates that a UV-call was
successful but may serve more data if called with a larger buffer
again.

Reviewed-by: Christoph Schlameuss <schlameuss@linux.ibm.com>
Signed-off-by: Steffen Eiden <seiden@linux.ibm.com>
---
arch/s390/boot/uv.c | 4 ++--
arch/s390/include/asm/uv.h | 1 +
2 files changed, 3 insertions(+), 2 deletions(-)

diff --git a/arch/s390/boot/uv.c b/arch/s390/boot/uv.c
index 318e6ba95bfd..2a71e759dc42 100644
--- a/arch/s390/boot/uv.c
+++ b/arch/s390/boot/uv.c
@@ -22,8 +22,8 @@ void uv_query_info(void)
if (!test_facility(158))
return;

- /* rc==0x100 means that there is additional data we do not process */
- if (uv_call(0, (uint64_t)&uvcb) && uvcb.header.rc != 0x100)
+ /* Ignore that there might be more data we do not process */
+ if (uv_call(0, (uint64_t)&uvcb) && uvcb.header.rc != UVC_RC_MORE_DATA)
return;

if (IS_ENABLED(CONFIG_KVM)) {
diff --git a/arch/s390/include/asm/uv.h b/arch/s390/include/asm/uv.h
index 153d93468b77..94ff58336e8e 100644
--- a/arch/s390/include/asm/uv.h
+++ b/arch/s390/include/asm/uv.h
@@ -28,6 +28,7 @@
#define UVC_RC_INV_STATE 0x0003
#define UVC_RC_INV_LEN 0x0005
#define UVC_RC_NO_RESUME 0x0007
+#define UVC_RC_MORE_DATA 0x0100
#define UVC_RC_NEED_DESTROY 0x8000

#define UVC_CMD_QUI 0x0001
--
2.43.0