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[04/22] lib: s390x: uv: Introduce UV validity function

Message ID 20230711141607.40742-5-nrb@linux.ibm.com (mailing list archive)
State New, archived
Headers show
Series [01/22] lib: s390x: mmu: fix conflicting types for get_dat_entry | expand

Commit Message

Nico Boehr July 11, 2023, 2:15 p.m. UTC 
From: Janosch Frank <frankja@linux.ibm.com>

PV related validities are in the 0x20** range but the last byte might
be implementation specific, so everytime we check for a UV validity we
need to mask the last byte.

Let's add a function that checks for a UV validity and returns a
boolean.

Signed-off-by: Janosch Frank <frankja@linux.ibm.com>
Reviewed-by: Claudio Imbrenda <imbrenda@linux.ibm.com>
Reviewed-by: Nico Boehr <nrb@linux.ibm.com>
Link: https://lore.kernel.org/r/20230619083329.22680-3-frankja@linux.ibm.com
Signed-off-by: Nico Boehr <nrb@linux.ibm.com>
---
 lib/s390x/uv.h | 7 +++++++
 1 file changed, 7 insertions(+)
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Patch

diff --git a/lib/s390x/uv.h b/lib/s390x/uv.h
index 5fe29bd..78b979b 100644
--- a/lib/s390x/uv.h
+++ b/lib/s390x/uv.h
@@ -35,4 +35,11 @@  static inline void uv_setup_asces(void)
 	lctlg(13, asce);
 }
 
+static inline bool uv_validity_check(struct vm *vm)
+{
+	uint16_t vir = sie_get_validity(vm);
+
+	return vm->sblk->icptcode == ICPT_VALIDITY && (vir & 0xff00) == 0x2000;
+}
+
 #endif /* UV_H */