linux-kernel - Re: [v2 PATCH] iommu/arm-smmu-v3: Fix L1 stream table index calculation for 32-bit sid size

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Message-ID: <20241004124343.GE2456194@ziepe.ca>
Date: Fri, 4 Oct 2024 09:43:43 -0300
From: Jason Gunthorpe <jgg@...pe.ca>
To: Yang Shi <yang@...amperecomputing.com>
Cc: Nicolin Chen <nicolinc@...dia.com>, james.morse@....com,
	will@...nel.org, robin.murphy@....com,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [v2 PATCH] iommu/arm-smmu-v3: Fix L1 stream table index
 calculation for 32-bit sid size

On Thu, Oct 03, 2024 at 08:31:23AM -0700, Yang Shi wrote:
> If I understand correctly, the check is mainly used to avoid the u64 -> u32
> overflow. This check guarantee no overflow. If some crazy hardware really
> requests that large memory, the allocation will fail.

Sure, the kalloc will print a warn on anyhow if it is too big

Jason