From: Jason Gunthorpe <jgg@ziepe.ca>
To: "Aneesh Kumar K.V" <aneesh.kumar@kernel.org>
Cc: "Christian König" <christian.koenig@amd.com>,
"Catalin Marinas" <catalin.marinas@arm.com>,
linux-coco@lists.linux.dev, kvmarm@lists.linux.dev,
linux-arm-kernel@lists.infradead.org,
linux-kernel@vger.kernel.org, iommu@lists.linux.dev,
"Marc Zyngier" <maz@kernel.org>,
"Marek Szyprowski" <m.szyprowski@samsung.com>,
"Robin Murphy" <robin.murphy@arm.com>,
"Steven Price" <steven.price@arm.com>,
"Suzuki K Poulose" <suzuki.poulose@arm.com>,
"Thomas Gleixner" <tglx@kernel.org>,
"Will Deacon" <will@kernel.org>,
"Sumit Semwal" <sumit.semwal@linaro.org>,
"T.J. Mercier" <tjmercier@google.com>
Subject: Re: [PATCH v6 7/9] dma-buf: system_heap: Enforce shared-granule alignment for cc-shared buffers
Date: Sat, 19 Sep 2026 18:35:31 -0300 [thread overview]
Message-ID: <20260919213531.GI11599@ziepe.ca> (raw)
In-Reply-To: <yq5atsnl47c6.fsf@kernel.org>
On Sat, Sep 19, 2026 at 08:27:29PM +0530, Aneesh Kumar K.V wrote:
> +static struct page *system_heap_alloc_order(unsigned int order, gfp_t flags,
> + bool cc_shared)
> +{
> + struct cc_shared_pages mem;
> +
> + if (!cc_shared)
> + return alloc_pages(flags, order);
> +
> + /* The shared granule can raise the actual allocation order. */
> + flags |= __GFP_COMP;
> + if (alloc_cc_shared_pages(flags, PAGE_SIZE << order, &mem))
> + return NULL;
Oh yeah that's surprisingly easy because of how this loop works with
order
Makes sense to me
> int alloc_cc_shared_pages_node(int nid, gfp_t gfp, size_t requested,
> struct cc_shared_pages *mem)
This argument order is a little weird from mm norms?
Jason
next prev parent reply other threads:[~2026-09-19 21:35 UTC|newest]
Thread overview: 24+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-09-04 10:34 [PATCH v6 0/9] coco: guest: Enforce host page-size alignment for shared buffers Aneesh Kumar K.V (Arm)
2026-09-04 10:34 ` [PATCH v6 1/9] mm/mem_encrypt: Add helpers for shared-buffer alignment Aneesh Kumar K.V (Arm)
2026-09-04 10:34 ` [PATCH v6 2/9] irqchip/gic-v3-its: Align shared ITS allocations to the CoCo shared granule size Aneesh Kumar K.V (Arm)
2026-09-04 10:34 ` [PATCH v6 3/9] dma-mapping: Pass allocation attrs to contiguous allocation helpers Aneesh Kumar K.V (Arm)
2026-09-04 10:34 ` [PATCH v6 4/9] dma-direct: Align CoCo shared DMA allocations to the shared granule size Aneesh Kumar K.V (Arm)
2026-09-18 14:16 ` Catalin Marinas
2026-09-04 10:34 ` [PATCH v6 5/9] swiotlb: Align shared IO TLB pools " Aneesh Kumar K.V (Arm)
2026-09-04 10:34 ` [PATCH v6 6/9] swiotlb: Reject misaligned restricted DMA pools for CoCo guests Aneesh Kumar K.V (Arm)
2026-09-04 10:34 ` [PATCH v6 7/9] dma-buf: system_heap: Enforce shared-granule alignment for cc-shared buffers Aneesh Kumar K.V (Arm)
2026-09-18 15:16 ` Catalin Marinas
2026-09-18 15:23 ` Christian König
2026-09-18 15:36 ` Jason Gunthorpe
2026-09-18 15:39 ` Christian König
2026-09-18 16:53 ` Jason Gunthorpe
2026-09-19 14:57 ` Aneesh Kumar K.V
2026-09-19 21:35 ` Jason Gunthorpe [this message]
2026-09-04 10:34 ` [PATCH v6 8/9] arm64: realm: Add RHI helper to query IPA state change alignment Aneesh Kumar K.V (Arm)
2026-09-16 16:12 ` Suzuki K Poulose
2026-09-18 10:39 ` Aneesh Kumar K.V
2026-09-04 10:34 ` [PATCH v6 9/9] arm64: realm: Expose the CCA shared granule size through mem_encrypt ops Aneesh Kumar K.V (Arm)
2026-09-16 16:17 ` Suzuki K Poulose
2026-09-18 16:52 ` [PATCH v6 0/9] coco: guest: Enforce host page-size alignment for shared buffers Catalin Marinas
2026-09-18 16:57 ` Jason Gunthorpe
2026-09-18 17:10 ` Catalin Marinas
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