Re: [Xen-devel] [OSSTEST PATCH 22/26] ts-debian-hvm-install: Use /dev/sda for i386, not /dev/xvda

[Ian Campbell <ian.campbell@xxxxxxxxxx>]

On Fri, 2015-09-18 at 18:50 +0100, Ian Jackson wrote:
> Empirically, the device shows up as /dev/sda.

This is because the plain i386 kernel used by the installer does not
support Xen (which requires PAE) and this affects even the options needed
for PVHVM. amd64 on the other hand doesn't have this restriction and PVHVM
works with the installer kernel.

Because of this the i386 install ends up using the emulated sda device
instead of switching to the pv devices as amd64 does.

I think it's probably worth explaining some of this in the commit log
rather than "Empirically".

IIRC someone was working on enabling PVHVM even for non-PAE i386 kernels,
not sure what the status of that is, but clearly it isn't going to change
things for Wheezy.

If you wanted instead to enable PV support for these installs then the
multi-arch (i386+amd64) isoimages contain the Xen enabled kernels for i386
(as /install.386/xen/*, n.b. /install.amd/xen/* are suitable symlinks, so
you can aoid special cases.

e.g. this one:

http://cdimage.debian.org/cdimage/archive/7.9.0/multi-arch/iso-cd/

(sorry for forgetting about this when we spoke IRL last week).

Anyway, that's clearly an "if you can be bothered thing" so with an
expanded commit message:
    Acked-by: Ian Campbell <    ian.campbell@xxxxxxxxxx    >


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