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Message-ID: <20231115203401.2495875-32-iii@linux.ibm.com>
Date: Wed, 15 Nov 2023 21:31:03 +0100
From: Ilya Leoshkevich <iii@...ux.ibm.com>
To: Alexander Gordeev <agordeev@...ux.ibm.com>,
Alexander Potapenko <glider@...gle.com>,
Andrew Morton <akpm@...ux-foundation.org>,
Christoph Lameter <cl@...ux.com>,
David Rientjes <rientjes@...gle.com>,
Joonsoo Kim <iamjoonsoo.kim@....com>,
Marco Elver <elver@...gle.com>,
Masami Hiramatsu <mhiramat@...nel.org>,
Pekka Enberg <penberg@...nel.org>,
Steven Rostedt <rostedt@...dmis.org>,
Vasily Gorbik <gor@...ux.ibm.com>,
Vlastimil Babka <vbabka@...e.cz>
Cc: Christian Borntraeger <borntraeger@...ux.ibm.com>,
Dmitry Vyukov <dvyukov@...gle.com>,
Hyeonggon Yoo <42.hyeyoo@...il.com>,
kasan-dev@...glegroups.com, linux-kernel@...r.kernel.org,
linux-mm@...ck.org, linux-s390@...r.kernel.org,
linux-trace-kernel@...r.kernel.org,
Mark Rutland <mark.rutland@....com>,
Roman Gushchin <roman.gushchin@...ux.dev>,
Sven Schnelle <svens@...ux.ibm.com>,
Ilya Leoshkevich <iii@...ux.ibm.com>
Subject: [PATCH 31/32] s390: Implement the architecture-specific kmsan functions
arch_kmsan_get_meta_or_null() finds the lowcore shadow by querying the
prefix and calling kmsan_get_metadata() again.
kmsan_virt_addr_valid() delegates to virt_addr_valid().
Signed-off-by: Ilya Leoshkevich <iii@...ux.ibm.com>
---
arch/s390/include/asm/kmsan.h | 36 +++++++++++++++++++++++++++++++++++
1 file changed, 36 insertions(+)
create mode 100644 arch/s390/include/asm/kmsan.h
diff --git a/arch/s390/include/asm/kmsan.h b/arch/s390/include/asm/kmsan.h
new file mode 100644
index 000000000000..afec71e9e9ac
--- /dev/null
+++ b/arch/s390/include/asm/kmsan.h
@@ -0,0 +1,36 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef _ASM_S390_KMSAN_H
+#define _ASM_S390_KMSAN_H
+
+#include <asm/lowcore.h>
+#include <asm/page.h>
+#include <linux/kmsan.h>
+#include <linux/mmzone.h>
+#include <linux/stddef.h>
+
+#ifndef MODULE
+
+static inline void *arch_kmsan_get_meta_or_null(void *addr, bool is_origin)
+{
+ if (addr >= (void *)&S390_lowcore &&
+ addr < (void *)(&S390_lowcore + 1)) {
+ /*
+ * Different lowcores accessed via S390_lowcore are described
+ * by the same struct page. Resolve the prefix manually in
+ * order to get a distinct struct page.
+ */
+ addr += (void *)lowcore_ptr[raw_smp_processor_id()] -
+ (void *)&S390_lowcore;
+ return kmsan_get_metadata(addr, is_origin);
+ }
+ return NULL;
+}
+
+static inline bool kmsan_virt_addr_valid(void *addr)
+{
+ return virt_addr_valid(addr);
+}
+
+#endif /* !MODULE */
+
+#endif /* _ASM_S390_KMSAN_H */
--
2.41.0
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