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Date: Wed, 25 Apr 2018 11:32:23 -0400
From: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Subject: [MODERATED] Re: [PATCH v4 06/10] [PATCH v4 6/9] Linux Patch #6
Message-ID: <20180425153206.GA27641@localhost.localdomain>
References: <20180424031751.311879235@dhcp-10-159-147-220.vpn.oracle.com>
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To: speck@linutronix.de
List-ID: <speck.linutronix.de>

On Tue, Apr 24, 2018 at 08:46:46PM +0200, speck for Borislav Petkov wrote:
> On Tue, Apr 24, 2018 at 02:07:50PM -0400, speck for Konrad Rzeszutek Wilk w=
rote:
> > And it nicely slurps it up from the CPUID.7.EDX[31].
>=20
> Yap.
>=20
> > Which means patch #7 is good - just needs a better name for the
> > X86_FEATURE_SPEC_STORE_BYPASS_DISABLE_BECAUSE_I_LIKE_LONG_NAMES
> >=20
>=20
> Huh?
>=20
> You either use X86_FEATURE_RDS
>=20
> XOR
>=20
> X86_FEATURE_SPEC_STORE_BYPASS_DISABLE
>=20
> No need for both.

We need two CPU bit flags. First to say:

 1). I am able to mitigate. This will be via X86_FEATURE_RDS for both
    AMD and Intel.

 2). I _want_ to mitigate. This will be via X86_FEATURE_SPEC_STORE_BYPASS_DIS=
ABLE
   to tell the init_amd_bd,init_amd_zn,init_amd_jg, and init_intel
   to do its magic.


>=20
> --=20
> Regards/Gruss,
>     Boris.
>=20
> SUSE Linux GmbH, GF: Felix Imend=C3=B6rffer, Jane Smithard, Graham Norton, =
HRB 21284 (AG N=C3=BCrnberg)
> --=20