linux-kernel - Re: Virtio-IOMMU interrupt remapping design

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Message-ID: <20250617230334.GJ1376515@ziepe.ca>
Date: Tue, 17 Jun 2025 20:03:34 -0300
From: Jason Gunthorpe <jgg@...pe.ca>
To: "Michael S. Tsirkin" <mst@...hat.com>
Cc: Demi Marie Obenour <demiobenour@...il.com>,
	Jason Wang <jasowang@...hat.com>,
	Xuan Zhuo <xuanzhuo@...ux.alibaba.com>,
	Eugenio Pérez <eperezma@...hat.com>,
	"Rafael J. Wysocki" <rafael@...nel.org>,
	Len Brown <lenb@...nel.org>, Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
	Dave Hansen <dave.hansen@...ux.intel.com>,
	"H. Peter Anvin" <hpa@...or.com>, Joerg Roedel <joro@...tes.org>,
	Will Deacon <will@...nel.org>, Robin Murphy <robin.murphy@....com>,
	Alyssa Ross <hi@...ssa.is>, virtualization@...ts.linux.dev,
	linux-kernel@...r.kernel.org, linux-acpi@...r.kernel.org,
	iommu@...ts.linux.dev, x86@...nel.org,
	Spectrum OS Development <devel@...ctrum-os.org>
Subject: Re: Virtio-IOMMU interrupt remapping design

On Tue, Jun 17, 2025 at 04:01:53PM -0400, Michael S. Tsirkin wrote:
> > On x86 you also need to use remapping to exceed the max CPU count that
> > can be encoded in the MSI, no iommu required to need this.
> 
> More of an x86 quirk though, isn't it?

Yes, but so is bundling IOMMU and remapping HW together <shrug>

GIC fully integrates it into the interrupt controller architecture.

Jason