linux-kernel - Re: [PATCH 00/67] KVM: iommu: Overhaul device posted IRQs support

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Message-ID: <6f070686a44225d36bc1086dc1643841b3d43d19.camel@infradead.org>
Date: Fri, 18 Apr 2025 14:01:45 +0100
From: David Woodhouse <dwmw2@...radead.org>
To: Sean Christopherson <seanjc@...gle.com>, Paolo Bonzini
 <pbonzini@...hat.com>,  Joerg Roedel <joro@...tes.org>, Lu Baolu
 <baolu.lu@...ux.intel.com>
Cc: kvm@...r.kernel.org, iommu@...ts.linux.dev,
 linux-kernel@...r.kernel.org,  Maxim Levitsky <mlevitsk@...hat.com>, Joao
 Martins <joao.m.martins@...cle.com>, David Matlack <dmatlack@...gle.com>
Subject: Re: [PATCH 00/67] KVM: iommu: Overhaul device posted IRQs support

On Fri, 2025-04-04 at 12:38 -0700, Sean Christopherson wrote:
> 
> This series is well tested except for one notable gap: I was not able to
> fully test the AMD IOMMU changes.  Long story short, getting upstream
> kernels into our full test environments is practically infeasible.  And
> exposing a device or VF on systems that are available to developers is a
> bit of a mess.

If I can make AMD bare-metal "instances" available to you, would that help?

Separately, I'd quite like to see the eventfd→MSI delivery linkage not
use the IRQ routing table at all, and not need a GSI# assigned. Doing
it that way is just a scaling and performance issue.

I recently looked through the irqfd code and came to the conclusion
that it wouldn't be hard to add a new user API which allows us to
simply configure the kvm_irq_routing_entry to be delivered when a given
eventfd fires, without using the table.

I haven't had a chance to look hard, hopefully your rework doesn't make
that any less feasible...

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