Re: [Xen-devel] [PATCH v7 08/10] x86/microcode: Synchronize late microcode loading

["Raj, Ashok" <ashok.raj@xxxxxxxxx>]

Hi Gao, Jan

On Tue, Jun 11, 2019 at 08:36:17PM +0800, Chao Gao wrote:
> On Wed, Jun 05, 2019 at 08:09:43AM -0600, Jan Beulich wrote:
> >
> >There's no comment here and nothing in the description: I don't
> >recall clarification as to whether RDTSC is fine to be issued by a
> >thread when ucode is being updated by another thread on the
> >same core.
> 
> Yes. I think it is fine.
> 
> Ashok, could you share your opinion on this question?
> 

Yes, rdtsc should be fine for other threads to execute while waiting for the 
microcode update to complete on others. We do the same in Linux as well.

Cheers,
Ashok

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