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hisi_acc_vfio_pci: Update migration data pointer correctly on saving/resume

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[ Upstream commit be12ad45e15b5ee0e2526a50266ba1d295d26a88 ]

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>
Reviewed-by: Jason Gunthorpe <jgg@nvidia.com>
Link: https://lore.kernel.org/r/20231120091406.780-1-shameerali.kolothum.thodi@huawei.com
Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Shameer Kolothum 2023-11-20 09:14:06 +00:00 committed by Greg Kroah-Hartman
parent 0b6f0be074
commit 45f80b2f23
1 changed files with 5 additions and 2 deletions
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7
drivers/vfio/pci/hisilicon/hisi_acc_vfio_pci.c
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@ -694,6 +694,7 @@ static ssize_t hisi_acc_vf_resume_write(struct file *filp, const char __user *bu
size_t len, loff_t *pos)
{
struct hisi_acc_vf_migration_file *migf = filp->private_data;
u8 *vf_data = (u8 *)&migf->vf_data;
loff_t requested_length;
ssize_t done = 0;
int ret;
@ -715,7 +716,7 @@ static ssize_t hisi_acc_vf_resume_write(struct file *filp, const char __user *bu
goto out_unlock;
}
ret = copy_from_user(&migf->vf_data, buf, len);
ret = copy_from_user(vf_data + *pos, buf, len);
if (ret) {
done = -EFAULT;
goto out_unlock;
@ -835,7 +836,9 @@ static ssize_t hisi_acc_vf_save_read(struct file *filp, char __user *buf, size_t
len = min_t(size_t, migf->total_length - *pos, len);
if (len) {
ret = copy_to_user(buf, &migf->vf_data, len);
u8 *vf_data = (u8 *)&migf->vf_data;
ret = copy_to_user(buf, vf_data + *pos, len);
if (ret) {
done = -EFAULT;
goto out_unlock;