linux-kernel - Re: [PATCH v7 3/4] iommu/arm: Add BBM Level 2 smmu feature

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Message-ID: <aFP2UXFNoLiLUpo8@arm.com>
Date: Thu, 19 Jun 2025 12:36:49 +0100
From: Catalin Marinas <catalin.marinas@....com>
To: Mikołaj Lenczewski <miko.lenczewski@....com>
Cc: ryan.roberts@....com, yang@...amperecomputing.com, will@...nel.org,
	jean-philippe@...aro.org, robin.murphy@....com, joro@...tes.org,
	maz@...nel.org, oliver.upton@...ux.dev, joey.gouly@....com,
	james.morse@....com, broonie@...nel.org, ardb@...nel.org,
	baohua@...nel.org, suzuki.poulose@....com, david@...hat.com,
	jgg@...pe.ca, nicolinc@...dia.com, jsnitsel@...hat.com,
	mshavit@...gle.com, kevin.tian@...el.com,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	iommu@...ts.linux.dev
Subject: Re: [PATCH v7 3/4] iommu/arm: Add BBM Level 2 smmu feature

On Tue, Jun 17, 2025 at 09:51:03AM +0000, Mikołaj Lenczewski wrote:
> For supporting BBM Level 2 for userspace mappings, we want to ensure
> that the smmu also supports its own version of BBM Level 2. Luckily, the
> smmu spec (IHI 0070G 3.21.1.3) is stricter than the aarch64 spec (DDI
> 0487K.a D8.16.2), so already guarantees that no aborts are raised when
> BBM level 2 is claimed.
> 
> Add the feature and testing for it under arm_smmu_sva_supported().
> 
> Signed-off-by: Mikołaj Lenczewski <miko.lenczewski@....com>
> Reviewed-by: Robin Murphy <robin.murphy@....com>
> Reviewed-by: Ryan Roberts <ryan.roberts@....com>

Reviewed-by: Catalin Marinas <catalin.marinas@....com>