Re: [PATCH v3] s390x: Add 3f program exception handler

Heiko Carstens
2020-09-08T15:54:44Z

On Tue, Sep 08, 2020 at 09:05:04AM -0400, Janosch Frank wrote:
> Program exception 3f (secure storage violation) can only be detected
> when the CPU is running in SIE with a format 4 state description,
> e.g. running a protected guest. Because of this and because user
> space partly controls the guest memory mapping and can trigger this
> exception, we want to send a SIGSEGV to the process running the guest
> and not panic the kernel.
>
> Signed-off-by: Janosch Frank <frankja@linux.ibm.com>
> CC: <stable@vger.kernel.org> # 5.7+
> Fixes: 084ea4d611a3 ("s390/mm: add (non)secure page access exceptions handlers")
> Reviewed-by: Claudio Imbrenda <imbrenda@linux.ibm.com>
> Reviewed-by: Cornelia Huck <cohuck@redhat.com>
> Acked-by: Christian Borntraeger <borntraeger@de.ibm.com>
> ---
> arch/s390/kernel/entry.h | 1 +
> arch/s390/kernel/pgm_check.S | 2 +-
> arch/s390/mm/fault.c | 20 ++++++++++++++++++++
> 3 files changed, 22 insertions(+), 1 deletion(-)

I guess this should go upstream via the s390 tree?
Should I pick this up?