Re: [Qemu-ppc] [PATCH qemu] spapr: Enable in-kernel H_SET_MODE handling

[Alexey Kardashevskiy]

On 09/04/2015 02:48 PM, David Gibson wrote:
> On Wed, Sep 02, 2015 at 07:29:58PM +1000, Alexey Kardashevskiy wrote:
> > For setting debug watchpoints, sPAPR guests use H_SET_MODE hypercall.
> > The existing QEMU H_SET_MODE handler does not support this but
> > the KVM handler in HV KVM does. However it is not enabled.
> >
> > This enables the in-kernel H_SET_MODE handler which handles:
> > - Completed Instruction Address Breakpoint Register
> > - Watch point 0 registers.
> >
> > The rest is still handled in QEMU.
> >
> > Reported-by: Anton Blanchard <address@hidden>
> > Signed-off-by: Alexey Kardashevskiy <address@hidden>
>
> Applied to spapr-dev; I'll move it into spapr-next once it's had a
> little more testing.

Another thing to keep in mind is that at some point in the past the host 
kernel used to handle H_SET_MODE and QEMU did not have the handler at all, 
now this functionality is in QEMU but some RHEL kernel could have picked a 
kernel with the in-kernel handler.


--
Alexey