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Re: virtio scsi under VirtualBox

On Fri, 22 Jan 2021 at 20:00, Reinoud Zandijk <> wrote:
> On Fri, Jan 22, 2021 at 02:23:46PM +0000, Chavdar Ivanov wrote:
> > After the latest virtio commits I no longer get the panic; the
> > virtio-scsi device is recognized and the bus is created; however, a
> > disk attached to it is not seen at all.
> thats interesting, since nothing changed that ought to have had influence; the
> only change was for virtio PCI v1.0's i386 compat the bus_space_write_8() was
> split into two bus_space_write_4()'s as its allowed by the spec. Since amd64
> can write on every alignment, its odd that the write_8 would fail unless its a
> VirtualBox emulation error that doesn't expect an 8 byter to be written in one
> go. Very strange, i'll see if i can manage that.
> But the discs are there in the dmesg! See
> sd0 at scsibus1 target 0 lun 0: <VBOX, HARDDISK, 1.0> disk fixed
> sd0: fabricating a geometry
> sd0: 16384 MB, 16384 cyl, 64 head, 32 sec, 512 bytes/sect x 33554432 sectors
> sd0: fabricating a geometry
> sd1 at scsibus1 target 1 lun 0: <VBOX, HARDDISK, 1.0> disk fixed
> sd1: fabricating a geometry
> sd1: 16384 MB, 16384 cyl, 64 head, 32 sec, 512 bytes/sect x 33554432 sectors
> sd1: fabricating a geometry
> sd2 at scsibus1 target 2 lun 0: <VBOX, HARDDISK, 1.0> disk fixed
> sd2: fabricating a geometry
> sd2: 32768 MB, 32768 cyl, 64 head, 32 sec, 512 bytes/sect x 67108864 sectors
> sd2: fabricating a geometry
> So you can just access them using `disklabel' and fsck'ing and mounting them
> etc. Since they don't spawn dk* i presume they are not GPT.
> Please let me know if anything is wrong?

Unfortunately no, sd[012] are attached to scsibus1, which is attached
to the mpt controller. It is scsibus0 which is attached to vioscsi0
vioscsi0 at virtio1: features: 0x100000000
vioscsi0: cmd_per_lun 128 qsize 1024 seg_max 126 max_target 1 max_lun 256
scsibus0 at vioscsi0: 1 target, 256 luns per target
vioscsi0: WARNING: power management not supported
scsibus1 at mpt0: 16 targets, 8 luns per target
> Reinoud

I still think it is this '1 target' - in order to be a bus, there
should be at least two targets available, as the controller itself has
one. Whether this is a driver problem or an emulation problem in the
vbox code, I don't know; I don't think I have tried vioscsi on a
different OS, which I am going to do now.



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