Re: [RFC PATCH v1 0/2] Improvements to SIGP handling [QEMU]

[Thomas Huth]

On 08/10/2021 22.38, Eric Farman wrote:
> I'm cleaning up some of the SIGP code in KVM and QEMU,
> and would like to propose the following changes.
>
> Patch 1 should be less concerning than its KVM counterpart,
> since the CZAM bit in question is already present in QEMU.
>
> Patch 2 provides some handshaking with KVM. Since QEMU
> injects a Stop IRQ for a couple of the SIGP orders, we
> can provide the flags associated with it, to provide some
> direction for how KVM should process it.
>
> While this has no dependency on the KVM code, the KVM series
> that I'm working on in parallel is here:
>
> https://lore.kernel.org/r/20211008203112.1979843-1-farman@linux.ibm.com/
>
> Eric Farman (2):
>    s390x: sigp: Force Set Architecture to return Invalid Parameter
>    s390x/kvm: Pass SIGP Stop flags
>
>   target/s390x/kvm/kvm.c |  4 ++++
>   target/s390x/sigp.c    | 18 +-----------------
>   2 files changed, 5 insertions(+), 17 deletions(-)

FYI, I've queued the first patch to my s390x-next branch:

https://gitlab.com/thuth/qemu/-/commits/s390x-next

... for the second patch, I'll wait for the discussion to settle.

 Thomas