linux-kernel - Re: [PATCH v2 12/12] iommu/amd: Introduce IOMMUFD vIOMMU support for AMD

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Message-ID: <20251006150128.GU3360665@nvidia.com>
Date: Mon, 6 Oct 2025 12:01:28 -0300
From: Jason Gunthorpe <jgg@...dia.com>
To: Nicolin Chen <nicolinc@...dia.com>
Cc: Suravee Suthikulpanit <suravee.suthikulpanit@....com>,
	linux-kernel@...r.kernel.org, robin.murphy@....com, will@...nel.org,
	joro@...tes.org, kevin.tian@...el.com, jsnitsel@...hat.com,
	vasant.hegde@....com, iommu@...ts.linux.dev, santosh.shukla@....com,
	sairaj.arunkodilkar@....com, jon.grimm@....com,
	prashanthpra@...gle.com, wvw@...gle.com, wnliu@...gle.com,
	gptran@...gle.com, kpsingh@...gle.com, joao.m.martins@...cle.com,
	alejandro.j.jimenez@...cle.com
Subject: Re: [PATCH v2 12/12] iommu/amd: Introduce IOMMUFD vIOMMU support for
 AMD

On Thu, Oct 02, 2025 at 01:05:32PM -0700, Nicolin Chen wrote:
> > +/*
> > + * See include/linux/iommufd.h
> > + * struct iommufd_viommu_ops - vIOMMU specific operations
> > + */
> > +const struct iommufd_viommu_ops amd_viommu_ops = {
> > +	.alloc_domain_nested = amd_iommu_alloc_domain_nested,
> > +};
> 
> Unfortunately, a viommu_ops with alloc_domain_nested is incomplete,
> IMHO. If this series gets merged alone, it declares that the kernel
> now supports AMD IOMMU's virtualization, which actually won't work
> without a cache invalidation op (SW) or hw_queue (HW-acceleration).

Yeah, I'd move this patch to a series implementing viommu fully.

I'm pretty sure this series is OK as is without it, but it would be
good to at least share a sketch of the viommu support to be sure
before merging it.

Jason