linux-kernel - Re: [PATCH v2] iommu/amd: Fix interrupt remapping when disable guest

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Message-ID: <20170628124447.GA28603@8bytes.org>
Date:   Wed, 28 Jun 2017 14:44:48 +0200
From:   Joerg Roedel <joro@...tes.org>
To:     Suravee Suthikulpanit <suravee.suthikulpanit@....com>
Cc:     iommu@...ts.linux-foundation.org, linux-kernel@...r.kernel.org,
        Joerg Roedel <jroedel@...e.de>
Subject: Re: [PATCH v2] iommu/amd: Fix interrupt remapping when disable
 guest_mode

On Mon, Jun 26, 2017 at 04:28:04AM -0500, Suravee Suthikulpanit wrote:
> Pass-through devices to VM guest can get updated IRQ affinity
> information via irq_set_affinity() when not running in guest mode.
> Currently, AMD IOMMU driver in GA mode ignores the updated information
> if the pass-through device is setup to use vAPIC regardless of guest_mode.
> This could cause invalid interrupt remapping.
> 
> Also, the guest_mode bit should be set and cleared only when
> SVM updates posted-interrupt interrupt remapping information.
> 
> Signed-off-by: Suravee Suthikulpanit <suravee.suthikulpanit@....com>
> Cc: Joerg Roedel <jroedel@...e.de>

Nervermind, I added this fixes line and applied the patch:

	Fixes: d98de49a53e48 ('iommu/amd: Enable vAPIC interrupt remapping mode by default'