Re: [Xen-users] How the file-backed VBD works in PV domain?

[Roger Pau Monné <roger.pau@xxxxxxxxxx>]

On 10/01/14 03:36, Younghyun Jo wrote:
> Hello Everyone,
> 
> I'm currently looking into how Xen(PV) Disk I/O works.
> And I want to know how they works in source level.
> 
> As we know, HVM uses QEMU and the PV / PVHVM uses Dom0 backend driver.
> And I could find that the Dom0
> kernel(driver/block/xen-blkback/blkback.c) do disk I/O in LVM-backed VBD.
> 
> But, I want to use File-backed VBD rather than LVM-backed VBD.
> I found that if I use file-backed VBD, then they don't use Dom0 backend
> driver.
> 
> So, Can I use backend driver in file-backed I/O?
> and I want to know how the file-backed VBD works in PV domain.

Everything that's not a block device is handled by Qemu Qdisk, which is
an implementation of blkback in userspace. See hw/block/xen_disk.c in
Qemu upstream source tree for it's implementation.

Roger.


_______________________________________________
Xen-users mailing list
Xen-users@xxxxxxxxxxxxx
http://lists.xen.org/xen-users