Date: Sun, 11 Aug 2013 11:49:20 -0700 From: Peter Grehan <grehan@freebsd.org> To: Aryeh Friedman <aryeh.friedman@gmail.com> Cc: freebsd-virtualization@freebsd.org Subject: Re: tech questions and development priorities for bhyve Message-ID: <5207DCB0.4030809@freebsd.org> In-Reply-To: <CAGBxaXkZsKeU9NOxacknYobA6xE0gq0VovO4s73JropY7c3LGQ@mail.gmail.com> References: <CAGBxaXkZsKeU9NOxacknYobA6xE0gq0VovO4s73JropY7c3LGQ@mail.gmail.com>
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Hi Aryeh,
> 1. How do I add a second block device as a disk?
You have 32 virtual PCI slots to play around with. Simply add another
virtio-block device and back it with a file to represent the block
device e.g.
-s 2,virtio-blk,/first/filesys/image \
-s 3,virtio-blk,/second/filesys/image \
-s 4,virtio-blk,/third/filesys/image
... etc.
(Actually, the virtio block/net can also be assigned to PCI functions
with no side-effects, so there are 32*8 available 'slots'. The function
syntax uses a colon appended to the slot e.g. "-s 1:0,virtio-blk,/file")
> 2. Same question but for net interfaces?
Same answer, though there has to be available tap devices created
-s 6,virtio-net,tap4 \
-s 7,virtio-net,tap5
... etc.
> What are the relative priorities of the following bhyve features:
>
> 1. Eliminate need for guest OS to have virtio
> 2. Boots via BIOS and not FreeBSD bootloader
> 3. Non-virtio pass through (specifically USB)
> 4. Nested virtualization
Tough call - they are all important. Work is being done on all 4,
though at various stages.
With non-virtio guest o/s's, there is a current GSoC project for AHCI
emulation which should take care of disk, and there is some work being
done on Intel NIC emulation.
For the BIOS boot, there was a GSoC project last year on this that was
almost there for FreeBSD. Booting using UEFI as a BIOS was demo'd at
BSDCan, though that is currently for EFI-aware o/s's, and is still in
the process of being made available.
Not quite sure what you mean by 3 - is that PCI pass-through ? Note
there is a GSoC project for USB emulation in bhyve.
For nested, I'm looking at it :)
later,
Peter.
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