From: Jason Gunthorpe <jgg@ziepe.ca>
To: Mostafa Saleh <smostafa@google.com>
Cc: linux-arm-kernel@lists.infradead.org,
linux-kernel@vger.kernel.org, kvmarm@lists.linux.dev,
iommu@lists.linux.dev, catalin.marinas@arm.com, will@kernel.org,
maz@kernel.org, oliver.upton@linux.dev, joey.gouly@arm.com,
suzuki.poulose@arm.com, yuzenghui@huawei.com, joro@8bytes.org,
jean-philippe@linaro.org, praan@google.com,
danielmentz@google.com, mark.rutland@arm.com, qperret@google.com,
tabba@google.com
Subject: Re: [PATCH v5 04/27] iommu/io-pgtable-arm: Factor kernel specific code out
Date: Mon, 15 Dec 2025 20:58:34 -0400 [thread overview]
Message-ID: <20251216005834.GC31492@ziepe.ca> (raw)
In-Reply-To: <aTw2x1UlldJGVA4Y@google.com>
On Fri, Dec 12, 2025 at 03:37:43PM +0000, Mostafa Saleh wrote:
> On Fri, Nov 28, 2025 at 12:45:41PM -0400, Jason Gunthorpe wrote:
> > On Mon, Nov 17, 2025 at 06:47:51PM +0000, Mostafa Saleh wrote:
> > > Some of the used APIs are only part of the kernel and are not
> > > available in the hypervisor, factor those out:
> > > - alloc/free memory
> >
> > Why not provide the iommu-pages API for the hypervisor environment?
> >
> > Same for virt_to_phys, that could be moved into an iommu-pages wrapper
> > too..
>
> I guess that's possible, but then we would have to stub dma_map/unmap,
> which might a bit ugly. I will look more into it.
I am hoping to drop the dma_map/unmap and replace it with an arch
cache flush call directly since the code is no longer modular and
relying on the DMA API will have some problems with a future patch
series I'm expecting..
Jason
next prev parent reply other threads:[~2025-12-16 0:58 UTC|newest]
Thread overview: 45+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-11-17 18:47 [PATCH v5 00/27] KVM: arm64: SMMUv3 driver for pKVM (trap and emulate) Mostafa Saleh
2025-11-17 18:47 ` [PATCH v5 01/27] KVM: arm64: Add a new function to donate memory with prot Mostafa Saleh
2025-11-17 18:47 ` [PATCH v5 02/27] KVM: arm64: Donate MMIO to the hypervisor Mostafa Saleh
2025-11-17 18:47 ` [PATCH v5 03/27] KVM: arm64: pkvm: Add pkvm_time_get() Mostafa Saleh
2025-11-17 18:47 ` [PATCH v5 04/27] iommu/io-pgtable-arm: Factor kernel specific code out Mostafa Saleh
2025-11-28 16:45 ` Jason Gunthorpe
2025-12-12 15:37 ` Mostafa Saleh
2025-12-16 0:58 ` Jason Gunthorpe [this message]
2025-12-16 23:08 ` Mostafa Saleh
2025-11-17 18:47 ` [PATCH v5 05/27] iommu/arm-smmu-v3: Split code with hyp Mostafa Saleh
2025-11-28 16:46 ` Jason Gunthorpe
2025-12-12 15:41 ` Mostafa Saleh
2025-11-17 18:47 ` [PATCH v5 06/27] iommu/arm-smmu-v3: Move TLB range invalidation into common code Mostafa Saleh
2025-11-17 18:47 ` [PATCH v5 07/27] iommu/arm-smmu-v3: Move IDR parsing to common functions Mostafa Saleh
2025-11-28 16:48 ` Jason Gunthorpe
2025-12-12 15:42 ` Mostafa Saleh
2025-12-17 13:59 ` Jason Gunthorpe
2025-11-17 18:47 ` [PATCH v5 08/27] KVM: arm64: iommu: Introduce IOMMU driver infrastructure Mostafa Saleh
2025-11-17 18:47 ` [PATCH v5 09/27] KVM: arm64: iommu: Shadow host stage-2 page table Mostafa Saleh
2025-11-17 18:47 ` [PATCH v5 10/27] KVM: arm64: iommu: Add memory pool Mostafa Saleh
2025-11-17 18:47 ` [PATCH v5 11/27] KVM: arm64: iommu: Support DABT for IOMMU Mostafa Saleh
2025-11-17 18:47 ` [PATCH v5 12/27] iommu/arm-smmu-v3-kvm: Add SMMUv3 driver Mostafa Saleh
2025-11-17 18:48 ` [PATCH v5 13/27] iommu/arm-smmu-v3-kvm: Add the kernel driver Mostafa Saleh
2025-11-17 18:48 ` [PATCH v5 14/27] iommu/arm-smmu-v3: Support probing KVM emulated devices Mostafa Saleh
2025-11-28 16:56 ` Jason Gunthorpe
2025-12-12 15:53 ` Mostafa Saleh
2025-12-17 14:00 ` Jason Gunthorpe
2025-11-17 18:48 ` [PATCH v5 15/27] iommu/arm-smmu-v3-kvm: Create array for hyp SMMUv3 Mostafa Saleh
2025-11-17 18:48 ` [PATCH v5 16/27] iommu/arm-smmu-v3-kvm: Take over SMMUs Mostafa Saleh
2025-11-17 18:48 ` [PATCH v5 17/27] iommu/arm-smmu-v3-kvm: Probe SMMU HW Mostafa Saleh
2025-11-28 17:07 ` Jason Gunthorpe
2025-12-12 16:07 ` Mostafa Saleh
2025-11-17 18:48 ` [PATCH v5 18/27] iommu/arm-smmu-v3-kvm: Add MMIO emulation Mostafa Saleh
2025-11-17 18:48 ` [PATCH v5 19/27] iommu/arm-smmu-v3-kvm: Shadow the command queue Mostafa Saleh
2025-11-17 18:48 ` [PATCH v5 20/27] iommu/arm-smmu-v3-kvm: Add CMDQ functions Mostafa Saleh
2025-11-17 18:48 ` [PATCH v5 21/27] iommu/arm-smmu-v3-kvm: Emulate CMDQ for host Mostafa Saleh
2025-11-17 18:48 ` [PATCH v5 22/27] iommu/arm-smmu-v3-kvm: Shadow stream table Mostafa Saleh
2025-11-17 18:48 ` [PATCH v5 23/27] iommu/arm-smmu-v3-kvm: Shadow STEs Mostafa Saleh
2025-11-17 18:48 ` [PATCH v5 24/27] iommu/arm-smmu-v3-kvm: Emulate GBPA Mostafa Saleh
2025-11-17 18:48 ` [PATCH v5 25/27] iommu/arm-smmu-v3-kvm: Support io-pgtable Mostafa Saleh
2025-11-17 18:48 ` [PATCH v5 26/27] iommu/arm-smmu-v3-kvm: Shadow the CPU stage-2 page table Mostafa Saleh
2025-11-17 18:48 ` [PATCH v5 27/27] iommu/arm-smmu-v3-kvm: Enable nesting Mostafa Saleh
2025-11-28 17:12 ` Jason Gunthorpe
2025-12-12 16:15 ` Mostafa Saleh
-- strict thread matches above, loose matches on Subject: below --
2025-11-26 13:09 [PATCH v5 04/27] iommu/io-pgtable-arm: Factor kernel specific code out kernel test robot
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