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Date: Thu, 19 Jun 2025 12:36:49 +0100
From: Catalin Marinas <catalin.marinas@arm.com>
To: =?utf-8?Q?Miko=C5=82aj?= Lenczewski <miko.lenczewski@arm.com>
Cc: ryan.roberts@arm.com, yang@os.amperecomputing.com, will@kernel.org,
	jean-philippe@linaro.org, robin.murphy@arm.com, joro@8bytes.org,
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	mshavit@google.com, kevin.tian@intel.com,
	linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org,
	iommu@lists.linux.dev
Subject: Re: [PATCH v7 3/4] iommu/arm: Add BBM Level 2 smmu feature
Message-ID: <aFP2UXFNoLiLUpo8@arm.com>
References: <20250617095104.6772-1-miko.lenczewski@arm.com>
 <20250617095104.6772-4-miko.lenczewski@arm.com>
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In-Reply-To: <20250617095104.6772-4-miko.lenczewski@arm.com>

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@arm.com>
> Reviewed-by: Robin Murphy <robin.murphy@arm.com>
> Reviewed-by: Ryan Roberts <ryan.roberts@arm.com>

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