linux-kernel - Re: [PATCH v4 06/28] iommu/arm-smmu-v3: Split code with hyp

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Message-ID: <aMlv6rLaZ80j33OV@google.com>
Date: Tue, 16 Sep 2025 14:10:50 +0000
From: Mostafa Saleh <smostafa@...gle.com>
To: Will Deacon <will@...nel.org>
Cc: 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,
	jgg@...pe.ca, mark.rutland@....com, praan@...gle.com
Subject: Re: [PATCH v4 06/28] iommu/arm-smmu-v3: Split code with hyp

On Tue, Sep 09, 2025 at 03:23:14PM +0100, Will Deacon wrote:
> On Tue, Aug 19, 2025 at 09:51:34PM +0000, Mostafa Saleh wrote:
> > The KVM SMMUv3 driver would re-use some of the cmdq code inside
> > the hypervisor, move these functions to a new common c file that
> > is shared between the host kernel and the hypervisor.
> > 
> > Signed-off-by: Mostafa Saleh <smostafa@...gle.com>
> > ---
> >  drivers/iommu/arm/arm-smmu-v3/Makefile        |   2 +-
> >  .../arm/arm-smmu-v3/arm-smmu-v3-common-hyp.c  | 114 ++++++++++++++
> >  drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c   | 146 ------------------
> >  drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.h   |  44 ++++++
> >  4 files changed, 159 insertions(+), 147 deletions(-)
> >  create mode 100644 drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3-common-hyp.c
> > 
> > diff --git a/drivers/iommu/arm/arm-smmu-v3/Makefile b/drivers/iommu/arm/arm-smmu-v3/Makefile
> > index 493a659cc66b..1918b4a64cb0 100644
> > --- a/drivers/iommu/arm/arm-smmu-v3/Makefile
> > +++ b/drivers/iommu/arm/arm-smmu-v3/Makefile
> > @@ -1,6 +1,6 @@
> >  # SPDX-License-Identifier: GPL-2.0
> >  obj-$(CONFIG_ARM_SMMU_V3) += arm_smmu_v3.o
> > -arm_smmu_v3-y := arm-smmu-v3.o
> > +arm_smmu_v3-y := arm-smmu-v3.o arm-smmu-v3-common-hyp.o
> >  arm_smmu_v3-$(CONFIG_ARM_SMMU_V3_IOMMUFD) += arm-smmu-v3-iommufd.o
> >  arm_smmu_v3-$(CONFIG_ARM_SMMU_V3_SVA) += arm-smmu-v3-sva.o
> >  arm_smmu_v3-$(CONFIG_TEGRA241_CMDQV) += tegra241-cmdqv.o
> > diff --git a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3-common-hyp.c b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3-common-hyp.c
> > new file mode 100644
> > index 000000000000..62744c8548a8
> > --- /dev/null
> > +++ b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3-common-hyp.c
> > @@ -0,0 +1,114 @@
> 
> Given that this thie is linked into both the kernel and the hypervisor
> objects, I think I'd drop the '-hyp' part from the filename. Maybe
> something like 'arm-smmu-v3-lib.c' instead?
> 

Yes, that makes more sense, will do that.

Thanks,
Mostafa

> Let the bike-shedding begin!
> 
> Will