For intel IGD passthrough into qemu instance, video fb and i915 driver are
disabled in grub:
root@test:/# runlevel
N 3
root@test:/# cat /etc/modprobe.d/blacklist.conf | grep i915
blacklist i915
root@test:/# cat /proc/cmdline
BOOT_IMAGE=/boot/vmlinuz-4.15.0-39-generic
root=UUID=f99dc416-56c0-4f6c-bd4b-1bf321b2e1ac ro text intel_iommu=on
iommu=pt video=efifb:off,vesafb:off vga=normal nofb nomodeset
i915.modeset=0 quiet splash vt.handoff=1
But i915 module still can be loaded:
root@test:/# lsmod | grep 915
i915 1617920 0
drm_kms_helper 172032 1 i915
drm 401408 2 drm_kms_helper,i915
i2c_algo_bit 16384 1 i915
video 45056 1 i915
In lspci output, it seems that i915 is not in use:
root@test:/# lspci -vvv -d 8086:5916
00:02.0 VGA compatible controller: Intel Corporation HD Graphics 620 (rev
02) (prog-if 00 [VGA controller])
Subsystem: Intel Corporation HD Graphics 620
...
Kernel modules: i915
My first question is, which video driver is now in use by kernel?
If i passthrough intel vga to vm, kernel driver in use will be vfio-pci.
My second question is, if I want to return the vga device to host after vm
destroyed. Which video driver should I input in iommu bind command?
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