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

[Alex Williamson <alex.williamson@redhat.com>]

On Fri, 5 Jan 2024 15:56:09 +0000
Shameerali Kolothum Thodi <shameerali.kolothum.thodi@huawei.com> wrote:

> Hi Alex,
> 
> Just a gentle ping on this. 

Thanks for the ping, it seems to have slipped under my radar.  Applied
to vfio next branch for v6.8.  Thanks,

Alex

> > -----Original Message-----
> > From: Jason Gunthorpe <jgg@nvidia.com>
> > Sent: Monday, November 20, 2023 2:29 PM
> > To: Shameerali Kolothum Thodi <shameerali.kolothum.thodi@huawei.com>
> > Cc: kvm@vger.kernel.org; linux-kernel@vger.kernel.org;
> > alex.williamson@redhat.com; yishaih@nvidia.com; kevin.tian@intel.com;
> > Linuxarm <linuxarm@huawei.com>; liulongfang <liulongfang@huawei.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@huawei.com>
> > > ---
> > >  drivers/vfio/pci/hisilicon/hisi_acc_vfio_pci.c | 7 +++++--
> > >  1 file changed, 5 insertions(+), 2 deletions(-)  
> > 
> > Reviewed-by: Jason Gunthorpe <jgg@nvidia.com>
> > 
> > Jason  
>