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Re: [PATCH] x86/kernel/cpu/amd.c: don't apply the lahf_lm workaround in a hypervisor

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  Re: [PATCH] x86/kernel/cpu/amd.c: don't apply the lahf_lm workaround  in a hypervisor Mikulas Patocka <mpatocka@redhat.com> - 2017-07-21 13:40 +0200
    Re: [PATCH] x86/kernel/cpu/amd.c: don't apply the lahf_lm workaround  in a hypervisor Borislav Petkov <bp@alien8.de> - 2017-07-21 14:30 +0200

#1693637 — Re: [PATCH] x86/kernel/cpu/amd.c: don't apply the lahf_lm workaround in a hypervisor

On Thu, 13 Jul 2017, Borislav Petkov wrote:

> On Wed, Jul 12, 2017 at 10:27:44PM -0400, Mikulas Patocka wrote:
> > It is not strictly needed, but it is annoying. I work in the console and 
> > it is annoying to see these "unhandled rdmsr" messages printed over the 
> > screen every time I reboot a virtual machine.
> 
> Those messages are already pr_debug_ratelimited(). Fix your loglevel to
> not see them.

The message 'unhandled rdmsr' is printed with "pr_err_ratelimited" in the 
kernels up to and including 4.9. So it can't be easily silenced, silencing 
it silences any errors.

(and I can't use kernels newer that 4.4 on the host machine because of 
broken hibernation)

Mikulas

> -- 
> Regards/Gruss,
>     Boris.
> 
> ECO tip #101: Trim your mails when you reply.
> --

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#1693663

On Fri, Jul 21, 2017 at 07:34:59AM -0400, Mikulas Patocka wrote:
> (and I can't use kernels newer that 4.4 on the host machine because of 
> broken hibernation)

And what do we do with upstream patches which we need in older kernels?

-- 
Regards/Gruss,
    Boris.

ECO tip #101: Trim your mails when you reply.
--

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