Re: [Xen-devel] [PATCH] libxl: No emulated disk driver for xvdX disk

[Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>]

On Mon, 26 Oct 2015, Boris Ostrovsky wrote:
> On 10/16/2015 10:01 AM, Ian Jackson wrote:
> > Anthony PERARD writes ("[PATCH] libxl: No emulated disk driver for xvdX
> > disk"):
> > > When a guest configuration list xvdX for its disks, there is no need to
> > > provide an emulated driver for the same target.
> > > 
> > > Such configuration can work with the OVMF firmware, as it supports PV
> > > disk.
> > Acked-by: Ian Jackson<ian.jackson@xxxxxxxxxxxxx>
> > 
> > I have checked this with the docs, and this change makes the libxl
> > behave as documented and as I intended when I wrote the doc.
> > 
> 
> 
> This commit prevents a guest from seeing disks that specify xvdX ("disk = [
> '/root/virt/fedora.img,raw,xvda,rw' ]", for example).
> 
> TBH, I am not sure I understand how this is supposed to work --- how is the
> guest expected to discover the disk?

The guest can access xvdX disks via the PV block protocol, or via
UEFI firmare using EFI BootServices.

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