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Date: Wed, 28 Jan 2026 10:31:11 +0100
From: Johannes Stezenbach <js@sig21.net>
To: iommu@lists.linux.dev
Cc: Joerg Roedel <joro@8bytes.org>,
	Suravee Suthikulpanit <suravee.suthikulpanit@amd.com>
Subject: Re: AMD IOMMU issue with hibernate on Asrock X600
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References: <aXeAOtGQUdlNZF6V@sig21.net>
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In-Reply-To: <aXeAOtGQUdlNZF6V@sig21.net>

Hi,

I was hoping to get some response.

TL;DR:

> [0.000] [  343.790320][ T4340] WARNING: drivers/iommu/amd/init.c:952 at amd_iommu_enable_interrupts+0x4c8/0x550, CPU#0: pm-hibernate/4340

- is it Linux or firmware bug?
- if Linux bug: please let me know what to do to help debug it
- if firmware bug: what additional tests to run; how to add a quirk

What's the downside of amd_iommu_intr=legacy? Does it only
affect kvm guests? What's the relationship with x2APIC?


TIA,
Johannes