Re: [Xen-devel] [PATCH RFC] Add SUPPORT.md

[Paul Durrant <Paul.Durrant@xxxxxxxxxx>]

> -----Original Message-----
> From: George Dunlap [mailto:george.dunlap@xxxxxxxxxx]
> Sent: 31 August 2017 11:56
> To: Paul Durrant <Paul.Durrant@xxxxxxxxxx>; xen-devel@xxxxxxxxxxxxxxxxxxxx
> Cc: Ian Jackson <Ian.Jackson@xxxxxxxxxx>; Wei Liu <wei.liu2@xxxxxxxxxx>;
> Andrew Cooper <Andrew.Cooper3@xxxxxxxxxx>; Jan Beulich
> <jbeulich@xxxxxxxx>; Tim (Xen.org) <tim@xxxxxxx>; Dario Faggioli
> <dario.faggioli@xxxxxxxxxx>; Tamas K Lengyel <tamas.lengyel@xxxxxxxxxxxx>;
> Roger Pau Monne <roger.pau@xxxxxxxxxx>; Stefano Stabellini
> <sstabellini@xxxxxxxxxx>; Anthony Perard <anthony.perard@xxxxxxxxxx>;
> Konrad Wilk <konrad.wilk@xxxxxxxxxx>
> Subject: Re: [PATCH RFC] Add SUPPORT.md
> 
> On 08/31/2017 11:46 AM, Paul Durrant wrote:
> >> -----Original Message-----
> >> +
> >> +### Blkfront
> >> +
> >> +    Status, Linux: Supported
> >> +    Status, FreeBSD: Supported, Security support external
> >> +    Status, Windows: Supported [XXX]
> >> +
> >> +Guest-side driver capable of speaking the Xen PV block protocol
> >> +
> >> +### Netfront
> >> +
> >> +    Status, Linux: Supported
> >> +    Status, FreeBSD: Supported, Security support external
> >> +    States, Windows: Supported [XXX]
> >> +
> >
> > The Windows PV drivers are a sub-project of Xen so I guess they should
> have the same level of support as Linux and FreeBSD frontends, but I'm
> unclear as to what 'Supported' means in context of guest-side code. E.g. if
> someone finds a way of crashing a network frontend using a specially crafted
> packet, does that mean that an XSA should be issued?
> 
> I would think so, yes.
> 
> >> +Guest-side driver capable of speaking the Xen PV networking protocol
> >> +
> >> +### Xen Framebuffer
> >> +
> >> +    Status, Linux (xen-fbfront): Supported
> >> +
> >> +Guest-side driver capable of speaking the Xen PV Framebuffer protocol
> >> +
> >> +[XXX FreeBSD? NetBSD?]
> >> +
> >> +### Xen Console
> >> +
> >> +    Status, Linux (hvc_xen): Supported
> >> +
> >> +Guest-side driver capable of speaking the Xen PV console protocol
> >> +
> >> +[XXX FreeBSD? NetBSD? Windows?]
> >> +
> >
> > There is one for Windows too.
> 
> OK, I'll add that in.
> 
> >> +### Xen PV keyboard
> >> +
> >> +    Status, Linux (xen-kbdfront): Supported
> >> +
> >> +Guest-side driver capable of speaking the Xen PV keyboard protocol
> >
> > There is one for Windows too. It's not been officially announced as it
> needed some fixes in QEMU allow frontends running in HVM guests to
> function correctly.
> 
> OK; would you describe its expected reliability in 4.10 as closer to
> "Here be dragons", or "Quirky"?

I've lost track of the state of the QEMU patches but, if they go in, then it 
should be completely reliable. If not then it will be non-functional... but the 
same would be true of the Linux frontend running in an HVM guest. (The patches 
fix a bug where xenvkbd and xenfb are interdependent... but the xenfb backend 
is only created in the xenpv machine type).

  Paul

> 
>  -George
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