[PATCH v6 0/9] coco: guest: Enforce host page-size alignment for shared buffers · "Aneesh Kumar K.V (Arm)" <aneesh.kumar@kernel.org> · 2026-09-04
[PATCH v6 1/9] mm/mem_encrypt: Add helpers for shared-buffer alignment · "Aneesh Kumar K.V (Arm)" <aneesh.kumar@kernel.org> · 2026-09-04
[PATCH v6 2/9] irqchip/gic-v3-its: Align shared ITS allocations to the CoCo shared granule size · "Aneesh Kumar K.V (Arm)" <aneesh.kumar@kernel.org> · 2026-09-04
[PATCH v6 3/9] dma-mapping: Pass allocation attrs to contiguous allocation helpers · "Aneesh Kumar K.V (Arm)" <aneesh.kumar@kernel.org> · 2026-09-04
[PATCH v6 4/9] dma-direct: Align CoCo shared DMA allocations to the shared granule size · "Aneesh Kumar K.V (Arm)" <aneesh.kumar@kernel.org> · 2026-09-04
Re: [PATCH v6 4/9] dma-direct: Align CoCo shared DMA allocations to the shared granule size · Catalin Marinas <catalin.marinas@arm.com> · 2026-09-18
[PATCH v6 5/9] swiotlb: Align shared IO TLB pools to the shared granule size · "Aneesh Kumar K.V (Arm)" <aneesh.kumar@kernel.org> · 2026-09-04
[PATCH v6 6/9] swiotlb: Reject misaligned restricted DMA pools for CoCo guests · "Aneesh Kumar K.V (Arm)" <aneesh.kumar@kernel.org> · 2026-09-04
[PATCH v6 7/9] dma-buf: system_heap: Enforce shared-granule alignment for cc-shared buffers · "Aneesh Kumar K.V (Arm)" <aneesh.kumar@kernel.org> · 2026-09-04
Re: [PATCH v6 7/9] dma-buf: system_heap: Enforce shared-granule alignment for cc-shared buffers · Catalin Marinas <catalin.marinas@arm.com> · 2026-09-18
Re: [PATCH v6 7/9] dma-buf: system_heap: Enforce shared-granule alignment for cc-shared buffers · Christian König <christian.koenig@amd.com> · 2026-09-18
Re: [PATCH v6 7/9] dma-buf: system_heap: Enforce shared-granule alignment for cc-shared buffers · Jason Gunthorpe <jgg@ziepe.ca> · 2026-09-18
Re: [PATCH v6 7/9] dma-buf: system_heap: Enforce shared-granule alignment for cc-shared buffers · Christian König <christian.koenig@amd.com> · 2026-09-18
Re: [PATCH v6 7/9] dma-buf: system_heap: Enforce shared-granule alignment for cc-shared buffers · Jason Gunthorpe <jgg@ziepe.ca> · 2026-09-18
Re: [PATCH v6 7/9] dma-buf: system_heap: Enforce shared-granule alignment for cc-shared buffers · Christian König <christian.koenig@amd.com> · 2026-09-21
Re: [PATCH v6 7/9] dma-buf: system_heap: Enforce shared-granule alignment for cc-shared buffers · Jason Gunthorpe <jgg@ziepe.ca> · 2026-09-21
Re: [PATCH v6 7/9] dma-buf: system_heap: Enforce shared-granule alignment for cc-shared buffers · Christian König <christian.koenig@amd.com> · 2026-09-21
Re: [PATCH v6 7/9] dma-buf: system_heap: Enforce shared-granule alignment for cc-shared buffers · Jason Gunthorpe <jgg@ziepe.ca> · 2026-09-21
Re: [PATCH v6 7/9] dma-buf: system_heap: Enforce shared-granule alignment for cc-shared buffers · Christian König <christian.koenig@amd.com> · 2026-09-21
Re: [PATCH v6 7/9] dma-buf: system_heap: Enforce shared-granule alignment for cc-shared buffers · Jason Gunthorpe <jgg@ziepe.ca> · 2026-09-21
Re: [PATCH v6 7/9] dma-buf: system_heap: Enforce shared-granule alignment for cc-shared buffers · Aneesh Kumar K.V <aneesh.kumar@kernel.org> · 2026-09-21
Re: [PATCH v6 7/9] dma-buf: system_heap: Enforce shared-granule alignment for cc-shared buffers · Catalin Marinas <catalin.marinas@arm.com> · 2026-09-22
Re: [PATCH v6 7/9] dma-buf: system_heap: Enforce shared-granule alignment for cc-shared buffers · Aneesh Kumar K.V <aneesh.kumar@kernel.org> · 2026-09-23
Re: [PATCH v6 7/9] dma-buf: system_heap: Enforce shared-granule alignment for cc-shared buffers · Aneesh Kumar K.V <aneesh.kumar@kernel.org> · 2026-09-19
Re: [PATCH v6 7/9] dma-buf: system_heap: Enforce shared-granule alignment for cc-shared buffers · Jason Gunthorpe <jgg@ziepe.ca> · 2026-09-19
Re: [PATCH v6 7/9] dma-buf: system_heap: Enforce shared-granule alignment for cc-shared buffers · Aneesh Kumar K.V <aneesh.kumar@kernel.org> · 2026-09-20
Re: [PATCH v6 7/9] dma-buf: system_heap: Enforce shared-granule alignment for cc-shared buffers · Aneesh Kumar K.V <aneesh.kumar@kernel.org> · 2026-09-21
[PATCH v6 8/9] arm64: realm: Add RHI helper to query IPA state change alignment · "Aneesh Kumar K.V (Arm)" <aneesh.kumar@kernel.org> · 2026-09-04
Re: [PATCH v6 8/9] arm64: realm: Add RHI helper to query IPA state change alignment · Suzuki K Poulose <suzuki.poulose@arm.com> · 2026-09-16
Re: [PATCH v6 8/9] arm64: realm: Add RHI helper to query IPA state change alignment · Aneesh Kumar K.V <aneesh.kumar@kernel.org> · 2026-09-18
[PATCH v6 9/9] arm64: realm: Expose the CCA shared granule size through mem_encrypt ops · "Aneesh Kumar K.V (Arm)" <aneesh.kumar@kernel.org> · 2026-09-04
Re: [PATCH v6 9/9] arm64: realm: Expose the CCA shared granule size through mem_encrypt ops · Suzuki K Poulose <suzuki.poulose@arm.com> · 2026-09-16
Re: [PATCH v6 0/9] coco: guest: Enforce host page-size alignment for shared buffers · Catalin Marinas <catalin.marinas@arm.com> · 2026-09-18
Re: [PATCH v6 0/9] coco: guest: Enforce host page-size alignment for shared buffers · Jason Gunthorpe <jgg@ziepe.ca> · 2026-09-18
Re: [PATCH v6 0/9] coco: guest: Enforce host page-size alignment for shared buffers · Catalin Marinas <catalin.marinas@arm.com> · 2026-09-18
Re: [PATCH v6 0/9] coco: guest: Enforce host page-size alignment for shared buffers · Aneesh Kumar K.V <aneesh.kumar@kernel.org> · 2026-09-23
Re: [PATCH v6 0/9] coco: guest: Enforce host page-size alignment for shared buffers · Jason Gunthorpe <jgg@ziepe.ca> · 2026-09-23

Re: [PATCH v6 0/9] coco: guest: Enforce host page-size alignment for shared buffers

From: Aneesh Kumar K.V <aneesh.kumar@kernel.org>
Date: 2026-09-23 05:01:27
Also in: kvmarm, linux-coco, linux-iommu, lkml

Jason Gunthorpe [off-list ref] writes:

On Fri, Sep 18, 2026 at 05:52:31PM +0100, Catalin Marinas wrote:

quoted

TBH, I'm tempted not to support this configuration at all, just fail
gracefully if the realm page size doesn't match the host's. However, if
that's a real world configuration,

realm != host is going to be fairly common.

host > realm is probably not that common, I would guess.

Wouldn't it be more common to run a distro with a 4K page size as the
guest on a custom hypervisor with a 4K or larger page size?

-aneesh

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