Re: [PATCH v2] iommu/vt-d: Allocate DMAR fault interrupts locally

[Baolu Lu]

On 3/22/24 4:50 AM, Dimitri Sivanich wrote:
> The Intel IOMMU code currently tries to allocate all DMAR fault interrupt
> vectors on the boot cpu.  On large systems with high DMAR counts this
> results in vector exhaustion, and most of the vectors are not initially
> allocated socket local.
>
> Instead, have a cpu on each node do the vector allocation for the DMARs on
> that node.  The boot cpu still does the allocation for its node during its
> boot sequence.
>
> Signed-off-by: Dimitri Sivanich<sivanich@xxxxxxx>
> ---
>
> v2: per Thomas Gleixner, implement this from a DYN CPU hotplug state, though
>      this implementation runs in CPUHP_AP_ONLINE_DYN space rather than
>      CPUHP_BP_PREPARE_DYN space.

Patch has been queued for iommu/vt-d.

Best regards,
baolu