linux-kernel - Re: [PATCH v4 14/16] iommu/amd: Refactor persistent DTE bits programming into amd_iommu_make_clear

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Message-ID: <aPmX1fKDtwr4seS0@Asurada-Nvidia>
Date: Wed, 22 Oct 2025 19:49:57 -0700
From: Nicolin Chen <nicolinc@...dia.com>
To: Suravee Suthikulpanit <suravee.suthikulpanit@....com>
CC: <jgg@...dia.com>, <linux-kernel@...r.kernel.org>, <robin.murphy@....com>,
	<will@...nel.org>, <joro@...tes.org>, <kevin.tian@...el.com>,
	<jsnitsel@...hat.com>, <vasant.hegde@....com>, <iommu@...ts.linux.dev>,
	<santosh.shukla@....com>, <sairaj.arunkodilkar@....com>, <jon.grimm@....com>,
	<prashanthpra@...gle.com>, <wvw@...gle.com>, <wnliu@...gle.com>,
	<gptran@...gle.com>, <kpsingh@...gle.com>, <joao.m.martins@...cle.com>,
	<alejandro.j.jimenez@...cle.com>
Subject: Re: [PATCH v4 14/16] iommu/amd: Refactor persistent DTE bits
 programming into amd_iommu_make_clear_dte()

On Tue, Oct 21, 2025 at 01:43:22AM +0000, Suravee Suthikulpanit wrote:
> To help avoid duplicate logic when programing DTE for nested translation.
> 
> Note that this commit changes behavior of when the IOMMU driver is
> switching domain during attach and the blocking domain, where DTE bit
> fields for interrupt pass-through (i.e. Lint0, Lint1, NMI, INIT, ExtInt)
> and System management message could be affected. These DTE bits are
> specified in the IVRS table for specific devices, and should be persistent.
> 
> Suggested-by: Jason Gunthorpe <jgg@...dia.com>
> Reviewed-by: Jason Gunthorpe <jgg@...dia.com>
> Signed-off-by: Suravee Suthikulpanit <suravee.suthikulpanit@....com>
 
Reviewed-by: Nicolin Chen <nicolinc@...dia.com>