From: "Michael S. Tsirkin" <mst@redhat.com>
To: Gerd Hoffmann <kraxel@redhat.com>
Cc: Eduardo Habkost <ehabkost@redhat.com>,
Marcel Apfelbaum <marcel.a@redhat.com>,
John Snow <jsnow@redhat.com>,
Markus Armbruster <armbru@redhat.com>,
qemu-devel@nongnu.org, Paolo Bonzini <pbonzini@redhat.com>,
Igor Mammedov <imammedo@redhat.com>,
Laszlo Ersek <lersek@redhat.com>,
Richard Henderson <rth@twiddle.net>
Subject: Re: [Qemu-devel] [PATCH 2/4] pc/q35: drop compatiility with old bios types
Date: Mon, 15 Feb 2016 13:30:49 +0200 [thread overview]
Message-ID: <20160215132645-mutt-send-email-mst@redhat.com> (raw)
In-Reply-To: <1455533904.7504.23.camel@redhat.com>
On Mon, Feb 15, 2016 at 11:58:24AM +0100, Gerd Hoffmann wrote:
> On So, 2016-02-07 at 12:29 +0200, Michael S. Tsirkin wrote:
> > We don't ship bios without support for loading ACPI anymore, and old q35
> > machine types don't allow migrating such bios. Drop it, as well as
> > has_*mr flags that are there for migration compatibility.
>
> Wouldn't that break migration between 2.5 and 2.6 with -M q35-1.6 ?
I think I said this somewhere but I'll repeat it here: I think we should
just mark the old machine types non migrateable.
> It's also a guest-visible change as acpi tables change ...
acpi tables change yes but not too much - there are just bugfixes. We
change acpi tables without versioning within reason.
For example, recent change by Igor completely removed SSDT and
affected old machine types too.
> I'm all for cleaning up this old cruft, but I think it would be cleaner
> to just drop the old (pre-migration support) q35 machine types instead
> of changing them in subtle ways ...
>
> cheers,
> Gerd
Easier, sure. Not sure about the cleaner ...
--
MST
next prev parent reply other threads:[~2016-02-15 11:31 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-02-07 10:29 [Qemu-devel] [PATCH 0/4] pc: drop AML files Michael S. Tsirkin
2016-02-07 10:29 ` [Qemu-devel] [PATCH 1/4] pc/piix: drop acpi-dsdt.aml Michael S. Tsirkin
2016-02-07 10:29 ` [Qemu-devel] [PATCH 2/4] pc/q35: drop compatiility with old bios types Michael S. Tsirkin
2016-02-15 10:58 ` Gerd Hoffmann
2016-02-15 11:30 ` Michael S. Tsirkin [this message]
2016-02-15 15:20 ` Eduardo Habkost
2016-02-15 14:16 ` Markus Armbruster
2016-02-07 10:29 ` [Qemu-devel] [PATCH 3/4] pc/q35: drop dsdt aml Michael S. Tsirkin
2016-02-07 10:29 ` [Qemu-devel] [PATCH 4/4] configure: don't install aml links Michael S. Tsirkin
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