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From: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Date: Fri, 20 Nov 2015 11:26:46 +1100
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Subject: Re: [Qemu-devel] [Qemu-ppc] [PATCH 09/77] ppc: Fix do_rfi() for rfi
	emulation
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To: David Gibson <david@gibson.dropbear.id.au>
Cc: qemu-ppc@nongnu.org, qemu-devel@nongnu.org

On Thu, 2015-11-19 at 21:23 +1100, Benjamin Herrenschmidt wrote:
>=C2=A0
> I only just discovered that rfi is actually gone from arch 2.07 :-)
>=20
> I'll dig a bit more tomorrow.

Ok, so I had a closer look and tore that stuff appart even more :-)

If you are curious, feel free to check out github. I've removed
the MSR mask completely, I can't figure out what it's supposed
to be about. I've quickly tested 64-bit powernv/pseries, 32-bit
userspace on 64-bit pseries kernel, and 32-bit Mac99 (ubuntu).

Cheers,
Ben.

> Cheers,
> Ben.
>=20
> >=20
> > >=20
> > > Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
> > > ---
> > > =C2=A0target-ppc/excp_helper.c | 4 ++--
> > > =C2=A01 file changed, 2 insertions(+), 2 deletions(-)
> > >=20
> > > diff --git a/target-ppc/excp_helper.c b/target-ppc/excp_helper.c
> > > index c1d6605..00fae60 100644
> > > --- a/target-ppc/excp_helper.c
> > > +++ b/target-ppc/excp_helper.c
> > > @@ -878,13 +878,13 @@ static inline void do_rfi(CPUPPCState *env,
> > > target_ulong nip, target_ulong msr,
> > > =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0CPUState *cs =3D CPU(ppc_env_get_cpu(=
env));
> > > =C2=A0
> > > =C2=A0#if defined(TARGET_PPC64)
> > > +=C2=A0=C2=A0=C2=A0=C2=A0msr =3D msr & msrm;
> > > =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0if (msr_is_64bit(env, msr)) {
> > > =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0nip =3D (uint=
64_t)nip;
> > > -=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0msr &=3D (uint64_t=
)msrm;
> > > =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0} else {
> > > =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0nip =3D (uint=
32_t)nip;
> > > -=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0msr =3D (uint32_t)=
(msr & msrm);
> > > =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0if (keep_msrh=
) {
> > > +	=C2=A0=C2=A0=C2=A0=C2=A0msr &=3D 0xffffffff;
> > > =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0msr |=3D env->msr & ~((uint64_t)0xFFFFFFFF);
> > > =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0}
> > > =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0}