linux-kernel - Re: 2.6.26, PAT and AMD family 6

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Message-ID: <86802c440805071545v75c808a5qcc4a3388c8a0de4d@mail.gmail.com>
Date:	Wed, 7 May 2008 15:45:18 -0700
From:	"Yinghai Lu" <yhlu.kernel@...il.com>
To:	"Pavel Machek" <pavel@...e.cz>
Cc:	"kernel list" <linux-kernel@...r.kernel.org>
Subject: Re: 2.6.26, PAT and AMD family 6

On Wed, May 7, 2008 at 3:39 PM, Pavel Machek <pavel@...e.cz> wrote:
> On Wed 2008-05-07 15:23:46, Yinghai Lu wrote:
>  > >  2) HPA said it was bad idea
>  >
>  > hpa said white list is not a good idea.
>
>  And guess what your patch is doing?
>
>
>  +       switch (c->x86_vendor) {
>  +       case X86_VENDOR_AMD:
>  +               if (c->x86 >= 0xf && c->x86 <= 0x11)
>  +                       set_cpu_cap(c, X86_FEATURE_PAT);
>  +               break;
>  +       case X86_VENDOR_INTEL:
>  +               if (c->x86 == 0xF || (c->x86 == 6 && c->x86_model >=
>  15))
>  +                       set_cpu_cap(c, X86_FEATURE_PAT);
>  +               break;
>  +       }
>
>  Seems like a whitelist to me. Will break with future CPUs.

again, i only increased the whitelist a little bit to support AMD
opteron Rev E, Rev F and Fam10h that I could access.

the code handle future cpus should reach the kernel list before SW
developer could get system....

YH
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