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Groups > linux.kernel > #1562638
| From | Borislav Petkov <bp@alien8.de> |
|---|---|
| Newsgroups | linux.kernel |
| Subject | Re: [PATCH v2 3/6] x86/cpu: Re-apply forced caps every time cpu caps are re-read |
| Date | 2017-01-19 12:50 +0100 |
| Message-ID | <t1jo6-10B-7@gated-at.bofh.it> (permalink) |
| References | <t13W1-83l-5@gated-at.bofh.it> <t13W3-83l-45@gated-at.bofh.it> |
| Organization | linux.* mail to news gateway |
On Wed, Jan 18, 2017 at 11:15:39AM -0800, Andy Lutomirski wrote:
> Calling get_cpu_cap() will reset a bunch of CPU features. This will
> cause the system to lose track of force-set and force-cleared
> featueres in the words that are reset until the end of CPU
features
> initialization. This can cause X86_FEATURE_FPU, for example, to
> change back and forth during boot and potentially confuse CPU setup.
>
> To minimize the chance of confusion, re-apply forced caps every time
> get_cpu_cap() is called.
>
> Signed-off-by: Andy Lutomirski <luto@kernel.org>
--
Regards/Gruss,
Boris.
Good mailing practices for 400: avoid top-posting and trim the reply.
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[PATCH v2 3/6] x86/cpu: Re-apply forced caps every time cpu caps are re-read Andy Lutomirski <luto@kernel.org> - 2017-01-18 20:20 +0100 Re: [PATCH v2 3/6] x86/cpu: Re-apply forced caps every time cpu caps are re-read Borislav Petkov <bp@alien8.de> - 2017-01-19 12:50 +0100 [tip:x86/fpu] x86/cpu: Re-apply forced caps every time CPU caps are re-read tip-bot for Andy Lutomirski <tipbot@zytor.com> - 2017-01-25 12:50 +0100
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