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    Subject[PATCH v2 32/33] s390: Implement the architecture-specific kmsan functions
    Date
    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@linux.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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