Re: [Qemu-devel] [PATCH v3] hw/i386: Deprecate the machines pc-0.10 to pc-1.2

[Laszlo Ersek]

On 07/12/17 10:22, Thomas Huth wrote:
> We don't want to carry along old machine types forever. If we are able to
> remove the pc machines up to 0.13 one day for example, this would allow
> us to eventually kill the code for rombar=0 (i.e. where QEMU copies ROM
> BARs directly to low memory). Everything up to pc-1.2 is also known to
> have issues with migration.  So let's start with a deprecation message
> for the old machine types so that the (hopefully) few users of these old
> systems start switching over to newer machine types instead.
> 
> Signed-off-by: Thomas Huth <address@hidden>
> ---
>  Note: Even if we mark all these old machines as deprecated, this ofcourse
>  doesn't mean that we also have to remove them all at once later when we
>  decide to finally really remove some. We could then also start by removing
>  0.10 and 0.11 only, for example (since there should really be no users left
>  for these), or only up to 0.13 (to be able to kill rombar=0).

On a tangent: "rombar=0" shouldn't be killed before the libvirt domain
XML regains the ability to say, "don't load any oprom for this device".
Please see <https://bugzilla.redhat.com/show_bug.cgi?id=1425058>.

(Please note that it is not lost on me that rombar=0 is a poor
substitute for romfile='', but currently rombar=0 is the only fallback
through libvirt. See the BZ pls.)

Thanks
Laszlo