Nicholas Piggin [off-list ref] writes:

Add KVM_CAP_PPC_AIL_MODE_3 to advertise the capability to set the AIL
resource mode to 3 with the H_SET_MODE hypercall. This capability
differs between processor types and KVM types (PR, HV, Nested HV), and
affects guest-visible behaviour.

QEMU will implement a cap-ail-mode-3 to control this behaviour[1], and
use the KVM CAP if available to determine KVM support[2].

[1] https://lists.nongnu.org/archive/html/qemu-ppc/2022-02/msg00437.html
[2] https://lists.nongnu.org/archive/html/qemu-ppc/2022-02/msg00439.html

Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
---
 Documentation/virt/kvm/api.rst         | 14 ++++++++++++++
 arch/powerpc/include/asm/setup.h       |  2 ++
 arch/powerpc/kvm/powerpc.c             | 20 ++++++++++++++++++++
 arch/powerpc/platforms/pseries/setup.c | 12 +++++++++++-
 include/uapi/linux/kvm.h               |  1 +
 tools/include/uapi/linux/kvm.h         |  1 +
 6 files changed, 49 insertions(+), 1 deletion(-)

This one especially, but may as well be the whole series, needs to be
Cc'ed to kvm@vger.kernel.org, so that the generic KVM folks are aware of
it.

Can you do a resend Cc'ing them please.

cheers