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Re: [PATCH v2] x86/CPUID: unconditionally set XEN_HVM_CPUID_IOMMU_MAPPINGS
- To: Jan Beulich <jbeulich@xxxxxxxx>
- From: Roger Pau Monné <roger.pau@xxxxxxxxxx>
- Date: Tue, 19 Jan 2021 15:31:46 +0100
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- Cc: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, Wei Liu <wl@xxxxxxx>, <xen-devel@xxxxxxxxxxxxxxxxxxxx>
- Delivery-date: Tue, 19 Jan 2021 14:32:02 +0000
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On Tue, Jan 19, 2021 at 03:26:22PM +0100, Jan Beulich wrote:
> On 19.01.2021 14:07, Roger Pau Monne wrote:
> > This is a revert of f5cfa0985673 plus a rework of the comment that
> > accompanies the setting of the flag so we don't forget why it needs to
> > be unconditionally set: it's indicating whether the version of Xen has
> > the original issue fixed and IOMMU entries are created for
> > grant/foreign maps.
> >
> > If the flag is only exposed when the IOMMU is enabled the guest could
> > resort to use bounce buffers when running backends as it would assume
> > the underlying Xen version still has the bug present and thus
> > grant/foreign maps cannot be used with devices.
> >
> > Signed-off-by: Roger Pau Monné <roger.pau@xxxxxxxxxx>
>
> Acked-by: Jan Beulich <jbeulich@xxxxxxxx>
>
> This time for real, I suppose.
Won't believe it until it hits the repo ;).
Thanks, Roger.
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