linux-kernel - Re: [PATCH rc v1 1/4] iommu/arm-smmu-v3: Add ignored bits to fix STE update sequence

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Message-ID: <20251206193830.GF1219718@nvidia.com>
Date: Sat, 6 Dec 2025 15:38:30 -0400
From: Jason Gunthorpe <jgg@...dia.com>
To: Shuai Xue <xueshuai@...ux.alibaba.com>
Cc: Nicolin Chen <nicolinc@...dia.com>, will@...nel.org,
	robin.murphy@....com, joro@...tes.org,
	linux-arm-kernel@...ts.infradead.org, iommu@...ts.linux.dev,
	linux-kernel@...r.kernel.org, skolothumtho@...dia.com,
	praan@...gle.com
Subject: Re: [PATCH rc v1 1/4] iommu/arm-smmu-v3: Add ignored bits to fix STE
 update sequence

On Sat, Dec 06, 2025 at 10:19:08PM +0800, Shuai Xue wrote:
> Instead of modifying the calculation logic, would it be cleaner to keep
> the original arm_smmu_get_ste_used() semantics intact and simply exclude
> ignored bits from cur_used after obtaining them?

I'm OK with this idea

Jason