Re: [PATCH 1/2] x86/pat: fix x86_has_pat_wp()

[Juergen Gross <jgross@xxxxxxxx>]

On 20.06.22 17:27, Dave Hansen wrote:
> On 6/20/22 03:41, Juergen Gross wrote:
> > > But I'm only guessing - this needs a *lot* more elaboration and
> > > explanation why exactly this is needed.
> > I will correct the code and update the commit message.
> It would also be great to cover the end-user-visible impact of the bug
> and the fix.  It _looks_ like it will probably only affect an SEV
> system's ability to read some EFI data.  That will presumably be pretty
> bad because it ends up reading from an encrypted mapping instead of a
> decrypted one.
Xen doesn't support SEV guests yet. So the only caveat here would be EFI
setting up PAT by itself.

Not sure this is really a real world issue.


Juergen

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