[RFC PATCH 0/1] KVM: PPC: Inform userspace about singlestep support

Fabiano Rosas farosas at linux.ibm.com
Thu Mar 21 05:39:49 AEDT 2019

I am looking for a way to inform userspace about the lack of an
implementation in KVM HV for single stepping of instructions

This will be used by QEMU to decide whether to attempt a call to the
set_guest_debug ioctl (for BookE, KVM PR) or fallback to a QEMU only
implementation (for KVM HV).

QEMU thread:

My current proposal is to introduce a ppc-specific capability for
this. However I'm not sure if this would be better as a cap common for
all architectures or even if it should report on all of the possible
set_guest_debug flags to cover for the future.

Please comment. Thanks.

Fabiano Rosas (1):
  KVM: PPC: Report single stepping capability

 arch/powerpc/kvm/powerpc.c | 5 +++++
 include/uapi/linux/kvm.h   | 1 +
 2 files changed, 6 insertions(+)


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