Hi Yajun, On 3/15/22 03:47, Yajun Wu wrote:
vDPA driver first uses kernel driver to allocate doorbell(VAR) area for each device. Then uses var->mmap_off and var->length to mmap uverbs device file as doorbell userspace virtual address.Current kernel driver provides var->mmap_off equal to page start of VAR. It's fine with x86 4K page server, because VAR physical address is only 4K aligned thus locate in 4K page start. But with aarch64 64K page server, the actual VAR physical address has offset within page(not locate in 64K page start). So vDPA driver need add this within page offset(caps.doorbell_bar_offset) to get right VAR virtual address. Fixes: 62c813706e4 ("vdpa/mlx5: map doorbell") Cc: [email protected] Signed-off-by: Yajun Wu <[email protected]> Acked-by: Matan Azrad <[email protected]> --- drivers/vdpa/mlx5/mlx5_vdpa_virtq.c | 9 ++++++++- 1 file changed, 8 insertions(+), 1 deletion(-)
Reviewed-by: Maxime Coquelin <[email protected]> Thanks, Maxime
