"
I think that using inb/outb in the case of VFIO with IOMMU enabled won't
work without cap_sys_rawio, and using it in the case of VFIO with IOMMU
disabled just bypasses VFIO and so is not correct.
Get your concern.
PIO bar:
HW virtio on HW machine: any vendor implements hardware virtio
using PIO bar? I think this isn't right. And i dout if vfio doesn't
check rawio perssion in the syscall in this case.
Para virtio: you have no choice to enable unsafe no-iommu mode.
You must have RAWIO permission.
Sorry. typo. "you have no choice but to enable unsafe no-iommu mode. "
so with PIO bar, the regression doesn't exist in real world.
Btw, our virtio device is basically MMIO bar, either in hardware
machine or in pass-throughed virtual machine.
Do you mean we apply or abandon patch 3? I am both OK. The first
priority to me is to enable MMIO bar support.
