linux-kernel - Re: [PATCH] hisi_acc_vfio_pci: Update migration data pointer correctly on saving/resume

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Date:   Mon, 20 Nov 2023 10:29:28 -0400
From:   Jason Gunthorpe <jgg@...dia.com>
To:     Shameer Kolothum <shameerali.kolothum.thodi@...wei.com>
Cc:     kvm@...r.kernel.org, linux-kernel@...r.kernel.org,
        alex.williamson@...hat.com, yishaih@...dia.com,
        kevin.tian@...el.com, linuxarm@...wei.com, liulongfang@...wei.com
Subject: Re: [PATCH] hisi_acc_vfio_pci: Update migration data pointer
 correctly on saving/resume

On Mon, Nov 20, 2023 at 09:14:06AM +0000, Shameer Kolothum wrote:
> When the optional PRE_COPY support was added to speed up the device
> compatibility check, it failed to update the saving/resuming data
> pointers based on the fd offset. This results in migration data
> corruption and when the device gets started on the destination the
> following error is reported in some cases,
> 
> [  478.907684] arm-smmu-v3 arm-smmu-v3.2.auto: event 0x10 received:
> [  478.913691] arm-smmu-v3 arm-smmu-v3.2.auto:  0x0000310200000010
> [  478.919603] arm-smmu-v3 arm-smmu-v3.2.auto:  0x000002088000007f
> [  478.925515] arm-smmu-v3 arm-smmu-v3.2.auto:  0x0000000000000000
> [  478.931425] arm-smmu-v3 arm-smmu-v3.2.auto:  0x0000000000000000
> [  478.947552] hisi_zip 0000:31:00.0: qm_axi_rresp [error status=0x1] found
> [  478.955930] hisi_zip 0000:31:00.0: qm_db_timeout [error status=0x400] found
> [  478.955944] hisi_zip 0000:31:00.0: qm sq doorbell timeout in function 2
> 
> Fixes: d9a871e4a143 ("hisi_acc_vfio_pci: Introduce support for PRE_COPY state transitions")
> Signed-off-by: Shameer Kolothum <shameerali.kolothum.thodi@...wei.com>
> ---
>  drivers/vfio/pci/hisilicon/hisi_acc_vfio_pci.c | 7 +++++--
>  1 file changed, 5 insertions(+), 2 deletions(-)

Reviewed-by: Jason Gunthorpe <jgg@...dia.com>

Jason