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    SubjectRe: [PATCH v2 03/15] s390: zcrypt: externalize AP instructions available function
    On Tue, 27 Feb 2018 09:28:01 -0500
    Tony Krowiak <akrowiak@linux.vnet.ibm.com> wrote:

    > If the AP instructions are not available on the linux host, then
    > AP devices can not be interpreted by the SIE. The AP bus has a
    > function it uses to determine if the AP instructions are
    > available. This patch provides a new function that wraps the
    > AP bus's function to externalize it for use by KVM.
    >
    > Signed-off-by: Tony Krowiak <akrowiak@linux.vnet.ibm.com>
    > Reviewed-by: Pierre Morel <pmorel@linux.vnet.ibm.com>
    > ---
    > arch/s390/include/asm/ap.h | 7 +++++++
    > drivers/s390/crypto/ap_bus.c | 6 ++++++
    > 2 files changed, 13 insertions(+), 0 deletions(-)

    While I don't see anything wrong with this patch as it stands, you need
    to be careful to call this only from vfio-ap code (which depends on
    CONFIG_ZCRYPT).

    Speaking of which: the ap_bus part cannot be a module, but only
    built-in, right? So we don't get additional module complications?

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