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Subject: Re: [virtio-dev] A simple example of virtio blk driver
On Wed, 2016-06-08 at 07:06 -0400, Paolo Bonzini wrote: > > > > > > > > > > > > > I am studying the virtio spec 1.0 and trying to write a virtio > > > > blk > > > > driver. > > > > > > > > Is there anywhere a simple example virtio blk driver can be > > > > found, > > > > which may be written with conformance to virtio spec 1.0? > > > > I would like to understand a simple virtio blk driver, how it > > > > is > > > > written. > > > > > > > > Better if there is any clear document available regarding a > > > > virtio > > > > blk driver implementation. > > > If you want to see a minimal driver, look at the SeaBIOS > > > src/hw/virtio-blk.c driver. It only uses a subset of virtio-blk > > > functionality. > > > > > > https://github.com/qemu/seabios/blob/master/src/hw/virtio-blk.c > > There's also a reasonably small/simple implementation in the > > FreeBSD > > bhyve stuff, e.g. > > > > https://github.com/freebsd/freebsd/blob/master/usr.sbin/bhyve/pci_v > > irtio_block.c > This is an implementation of the device though, not the driver. :) Oh yes, ENOTENOUGHCOFFEE. > It's not 100% clear from Srinivas message whether he wanted a > device or a driver. Reading back I think he probably did mean a driver. My point about the low level "smarts" being in common code still stands ;-) Ian.