Re: [Xen-devel] [PATCH 0/3] x86/paravirt: Fix baremetal paravirt MSR ops

[Borislav Petkov <bp@xxxxxxxxx>]

On Thu, Sep 17, 2015 at 09:19:20AM +0200, Ingo Molnar wrote:
> Most big distro kernels on bare metal have CONFIG_PARAVIRT=y (I checked 
> Ubuntu and 
> Fedora), so we are potentially exposing a lot of users to problems.

+ SUSE.

> Crashing the bootup on an unknown MSR is bad. Many MSR reads and writes are 
> non-critical and returning the 'safe' result is much better than crashing or 
> hanging the bootup.

... and prepending all MSR accesses with feature/CPUID checks is probably almost
impossible.

-- 
Regards/Gruss,
    Boris.

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

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