On Mon, Jun 16, 2025 at 12:53:40PM -0400, Demi Marie Obenour wrote:
> > AFAIK hyperv shows how to build something like this.
> Would this need KVM patches? I'm concerned that implementing this
> in userspace would interact badly with the irqfd fast path.
I don't know. I think you get the same is
On 6/16/25 09:20, Jason Gunthorpe wrote:
> On Sun, Jun 15, 2025 at 02:47:15PM -0400, Demi Marie Obenour wrote:
>
>> Is a paravirtualized IOMMU with interrupt remapping something that makes
>> sense?
>
> IMHO linking interrupt remapping to the iommu is a poor design,
> interrupt routing belongs in
On Sun, Jun 15, 2025 at 02:47:15PM -0400, Demi Marie Obenour wrote:
> Is a paravirtualized IOMMU with interrupt remapping something that makes
> sense?
IMHO linking interrupt remapping to the iommu is a poor design,
interrupt routing belongs in the irq subsystem, not in the iommu.
The fact AMD a
Virtio-IOMMU interrupt remapping turned out to be much harder than I
realized. The main problem is that interrupt remapping is set up
very early in boot. In fact, Linux calls the interrupt remapping probe
function from the APIC initialization code: x86_64_probe_apic ->
enable_IR_x2apic -> irq_rem
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