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

[Baolu Lu]

On 2024/4/8 14:54, Tian, Kevin wrote:
> > From: Dimitri Sivanich <sivanich@xxxxxxx>
> > Sent: Friday, March 22, 2024 4:51 AM
> >
> > 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>
>
> Reviewed-by: Kevin Tian <kevin.tian@xxxxxxxxx>

Kevin,

Jacob has another proposal which shares the irq among all IOMMUs.

https://lore.kernel.org/linux-iommu/20240403234548.989061-1-jacob.jun.pan@xxxxxxxxxxxxxxx/

How do you like this?

Best regards,
baolu