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Re: [Xen-devel] [PATCH v6 1/8] AMD/IOMMU: don't blindly allocate interrupt remapping tables


  • To: Jan Beulich <jbeulich@xxxxxxxx>, "xen-devel@xxxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxxx>
  • From: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
  • Date: Wed, 25 Sep 2019 14:23:29 +0100
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  • Cc: Suravee Suthikulpanit <suravee.suthikulpanit@xxxxxxx>
  • Delivery-date: Wed, 25 Sep 2019 13:23:37 +0000
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On 19/09/2019 14:21, Jan Beulich wrote:
> ACPI tables are free to list far more device coordinates than there are
> actual devices. By delaying the table allocations for most cases, and
> doing them only when an actual device is known to be present at a given
> position, overall memory used for the tables goes down from over 500k
> pages to just over 1k (on my system having such ACPI table contents).
>
> Tables continue to get allocated right away for special entries
> (IO-APIC, HPET) as well as for alias IDs. While in the former case
> that's simply because there may not be any device at a given position,
> in the latter case this is to avoid having to introduce ref-counting of
> table usage.
>
> The change involves invoking
> iterate_ivrs_mappings(amd_iommu_setup_device_table) a second time,
> because the function now wants to be able to find PCI devices, which
> isn't possible yet when IOMMU setup happens very early during x2APIC
> mode setup. In this context amd_iommu_init_interrupt() gets renamed as
> well.
>
> The logic adjusting a DTE's interrupt remapping attributes also gets
> changed, such that the lack of an IRT would result in target aborted
> rather than not remapped interrupts (should any occur).

non-remapped or un-remapped would be slightly less awkward grammar here.

> Note that for now phantom functions get separate IRTs allocated, as was
> the case before.
>
> Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>

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

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