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Date:   Mon, 17 Feb 2020 12:51:36 -0700
From:   Jerry Snitselaar <>
To:     Joerg Roedel <>
Cc:     Lu Baolu <>,
        David Woodhouse <>,,,
Subject: Re: [PATCH 3/5] iommu/vt-d: Do deferred attachment in

On Mon Feb 17 20, Joerg Roedel wrote:
>From: Joerg Roedel <>
>The attachment of deferred devices needs to happen before the check
>whether the device is identity mapped or not. Otherwise the check will
>return wrong results, cause warnings boot failures in kdump kernels, like
>	WARNING: CPU: 0 PID: 318 at ../drivers/iommu/intel-iommu.c:592 domain_get_iommu+0x61/0x70
>	[...]
>	 Call Trace:
>	  __intel_map_single+0x55/0x190
>	  intel_alloc_coherent+0xac/0x110
>	  dmam_alloc_attrs+0x50/0xa0
>	  ahci_port_start+0xfb/0x1f0 [libahci]
>	  ata_host_start.part.39+0x104/0x1e0 [libata]
>With the earlier check the kdump boot succeeds and a crashdump is written.
>Signed-off-by: Joerg Roedel <>

Reviewed-by: Jerry Snitselaar <>

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