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Re: [Xen-devel] [PATCH v2 1/2] AMD/IOMMU: correct handling when XT's prereq features are unavailable


  • To: Jan Beulich <jbeulich@xxxxxxxx>, "xen-devel@xxxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxxx>
  • From: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
  • Date: Fri, 28 Feb 2020 12:38:52 +0000
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  • Cc: Wei Liu <wl@xxxxxxx>, Roger Pau Monné <roger.pau@xxxxxxxxxx>
  • Delivery-date: Fri, 28 Feb 2020 12:39:07 +0000
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On 28/02/2020 12:10, Jan Beulich wrote:
> We should neither cause IOMMU initialization as a whole to fail in this
> case (we should still be able to bring up the system in non-x2APIC or
> x2APIC physical mode), nor should the remainder of the function be
> skipped (as the main part of it won't get entered a 2nd time) in such an
> event. It is merely necessary for the function to indicate to the caller
> (iov_supports_xt()) that setup failed as far as x2APIC is concerned.
>
> Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>

Looks much better.

Reviewed-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>

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