linux-kernel - Re: [PATCH v4 22/28] iommu/arm-smmu-v3-kvm: Emulate CMDQ for host

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Message-ID: <20250917123601.GA1326709@ziepe.ca>
Date: Wed, 17 Sep 2025 09:36:01 -0300
From: Jason Gunthorpe <jgg@...pe.ca>
To: Mostafa Saleh <smostafa@...gle.com>
Cc: Will Deacon <will@...nel.org>, linux-kernel@...r.kernel.org,
	kvmarm@...ts.linux.dev, linux-arm-kernel@...ts.infradead.org,
	iommu@...ts.linux.dev, maz@...nel.org, oliver.upton@...ux.dev,
	joey.gouly@....com, suzuki.poulose@....com, yuzenghui@...wei.com,
	catalin.marinas@....com, robin.murphy@....com,
	jean-philippe@...aro.org, qperret@...gle.com, tabba@...gle.com,
	mark.rutland@....com, praan@...gle.com
Subject: Re: [PATCH v4 22/28] iommu/arm-smmu-v3-kvm: Emulate CMDQ for host

On Tue, Sep 16, 2025 at 03:19:02PM +0000, Mostafa Saleh wrote:

> I think the fix for the problem Will mentioned is to just use CMOs
> before accessing the host structures, so that should be simple.
> If it turns to be more complicated, I am happy to drop the support
> for non-coherent devices from this series and we can add it later.

I feel like it is easier/better to fix the driver to use cachable
memory than to add CMOs to the pkvm side..

This way it will help qemu/etc as well.

Jason