Messages in this thread | | | Date | Wed, 23 Sep 2020 10:26:46 -0700 | From | Sean Christopherson <> | Subject | Re: [PATCH] KVM: SVM: Mark SEV launch secret pages as dirty. |
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On Wed, Sep 23, 2020 at 07:16:08PM +0200, Paolo Bonzini wrote: > On 23/09/20 19:04, Sean Christopherson wrote: > >> Two of the three instances are a bit different though. What about this > >> which at least shortens the comment to 2 fewer lines: > > Any objection to changing those to "Flush (on non-coherent CPUs)"? I agree > > it would be helpful to call out the details, especially for DBG_*, but I > > don't like that it reads as if the flush is unconditional. > > Hmm... It's already fairly long lines so that would wrap to 3 lines, and
Dang, I was hoping it would squeeze into 2.
> the reference to the conditional flush wasn't there before either.
Well, the flush wasn't conditional before (ignoring the NULL check).
> sev_clflush_pages could be a better place to mention that (or perhaps > it's self-explanatory).
I agree, but with
/* * Flush before LAUNCH_UPDATE encrypts pages in place, in case the cache * contains the data that was written unencrypted. */ sev_clflush_pages(inpages, npages);
there's nothing in the comment or code that even suggests sev_clflush_pages() is conditional, i.e. no reason for the reader to peek at the implemenation.
What about:
/* * Flush (on non-coherent CPUs) before LAUNCH_UPDATE encrypts pages in * place, the cache may contain data that was written unencrypted. */
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