Re: [PATCH 07/16] SUPPORT.md: Add virtual devices common to ARM and x86

["Jan Beulich" <JBeulich@suse.com>]

>>> On 13.11.17 at 16:41, <george.dunlap@citrix.com> wrote:
> +### PV USB support for xl
> +
> +    Status: Supported
> +
> +### PV 9pfs support for xl
> +
> +    Status: Tech Preview

Why are these two being called out, but xl support for other device
types isn't?

> +### QEMU backend hotplugging for xl
> +
> +    Status: Supported

Wouldn't this more appropriately be

### QEMU backend hotplugging

    Status, xl: Supported

?

> +## Virtual driver support, guest side
> +
> +### Blkfront
> +
> +    Status, Linux: Supported
> +    Status, FreeBSD: Supported, Security support external
> +    Status, NetBSD: Supported, Security support external
> +    Status, Windows: Supported
> +
> +Guest-side driver capable of speaking the Xen PV block protocol
> +
> +### Netfront
> +
> +    Status, Linux: Supported
> +    States, Windows: Supported
> +    Status, FreeBSD: Supported, Security support external
> +    Status, NetBSD: Supported, Security support external
> +    Status, OpenBSD: Supported, Security support external

Seeing the difference in OSes between the two (with the variance
increasing in entries further down) - what does the absence of an
OS on one list, but its presence on another mean? While not
impossible, I would find it surprising if e.g. OpenBSD had netfront
but not even a basic blkfront.

> +Guest-side driver capable of speaking the Xen PV networking protocol
> +
> +### PV Framebuffer (frontend)
> +
> +    Status, Linux (xen-fbfront): Supported
> +
> +Guest-side driver capable of speaking the Xen PV Framebuffer protocol
> +
> +### PV Console (frontend)
> +
> +    Status, Linux (hvc_xen): Supported
> +    Status, Windows: Supported
> +    Status, FreeBSD: Supported, Security support external
> +    Status, NetBSD: Supported, Security support external
> +
> +Guest-side driver capable of speaking the Xen PV console protocol
> +
> +### PV keyboard (frontend)
> +
> +    Status, Linux (xen-kbdfront): Supported
> +    Status, Windows: Supported
> +
> +Guest-side driver capable of speaking the Xen PV keyboard protocol

Are these three active/usable in guests regardless of whether the
guest is being run PV, PVH, or HVM? If not, wouldn't this need
spelling out?

> +## Virtual device support, host side
> +
> +### Blkback
> +
> +    Status, Linux (blkback): Supported

Strictly speaking, if the driver name is to be spelled out here in
the first place, it's xen-blkback here and ...

> +    Status, FreeBSD (blkback): Supported, Security support external
> +    Status, NetBSD (xbdback): Supported, security support external
> +    Status, QEMU (xen_disk): Supported
> +    Status, Blktap2: Deprecated
> +
> +Host-side implementations of the Xen PV block protocol
> +
> +### Netback
> +
> +    Status, Linux (netback): Supported

... xen-netback here for the upstream kernels.

> +### PV USB (backend)
> +
> +    Status, Linux: Experimental

What existing/upstream code does this refer to?

Jan


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