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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 <> 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 <>
> Reviewed-by: Pierre Morel <>
> ---
> 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

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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