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    Subject[PATCH 5.8 098/148] s390/runtime_instrumentation: fix storage key handling
    Date
    From: Heiko Carstens <hca@linux.ibm.com>

    [ Upstream commit 9eaba29c7985236e16468f4e6a49cc18cf01443e ]

    The key member of the runtime instrumentation control block contains
    only the access key, not the complete storage key. Therefore the value
    must be shifted by four bits.
    Note: this is only relevant for debugging purposes in case somebody
    compiles a kernel with a default storage access key set to a value not
    equal to zero.

    Fixes: e4b8b3f33fca ("s390: add support for runtime instrumentation")
    Reported-by: Claudio Imbrenda <imbrenda@linux.ibm.com>
    Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
    Signed-off-by: Sasha Levin <sashal@kernel.org>
    ---
    arch/s390/kernel/runtime_instr.c | 2 +-
    1 file changed, 1 insertion(+), 1 deletion(-)

    diff --git a/arch/s390/kernel/runtime_instr.c b/arch/s390/kernel/runtime_instr.c
    index 125c7f6e87150..1788a5454b6fc 100644
    --- a/arch/s390/kernel/runtime_instr.c
    +++ b/arch/s390/kernel/runtime_instr.c
    @@ -57,7 +57,7 @@ static void init_runtime_instr_cb(struct runtime_instr_cb *cb)
    cb->k = 1;
    cb->ps = 1;
    cb->pc = 1;
    - cb->key = PAGE_DEFAULT_KEY;
    + cb->key = PAGE_DEFAULT_KEY >> 4;
    cb->v = 1;
    }

    --
    2.25.1


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