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Re: [Qemu-devel] [PATCH RFC] hw/pc: set q35 as the default x86 machine
From: |
Eduardo Habkost |
Subject: |
Re: [Qemu-devel] [PATCH RFC] hw/pc: set q35 as the default x86 machine |
Date: |
Mon, 4 Jun 2018 09:54:15 -0300 |
User-agent: |
Mutt/1.9.2 (2017-12-15) |
On Mon, Jun 04, 2018 at 04:38:22AM +0300, Michael S. Tsirkin wrote:
> On Sun, Jun 03, 2018 at 12:27:49PM +0300, Marcel Apfelbaum wrote:
> > Moving to QEMU 3.0 seems like a good opportunity for such a change.
> >
> > I440FX is really old and does not support modern features like IOMMU.
> > Q35's SATA emulation is faster than pc's IDE, native PCI express hotplug
> > is cleaner than ACPI based one and so on...
> >
> > Also the libvirt guys added very good support for the Q35 machine (thanks!).
> >
> > Management software should always specify the machine type and for the
> > current setups, adding '-machine pc' to the command line is not such a
> > big deal.
> >
> > In time the pc machine will fade out and we will probably stop adding
> > new versions at some point.
> >
> > Signed-off-by: Marcel Apfelbaum <address@hidden>
>
> For command line users, I think changing the default isn't nice.
>
> Yes it's easy to add -machine pc but there's no documentation
> that tells you to do so. Add to that shortcuts like -cdrom
> stop working, hotplug needs extra bridges to work, and one
> can see that while management tool users benefit from q35,
> command line users will suffer.
>
> Can't we add a tag for management without changing the command line
> default? How about "management-default"? "recommended"? "latest"?
We could add new aliases if they are useful for management
software, but we would need a well-defined use case and set of
requirements+expectations for the new alias.
--
Eduardo
- [Qemu-devel] [PATCH RFC] hw/pc: set q35 as the default x86 machine, Marcel Apfelbaum, 2018/06/03
- Re: [Qemu-devel] [PATCH RFC] hw/pc: set q35 as the default x86 machine, Michael S. Tsirkin, 2018/06/04
- Re: [Qemu-devel] [PATCH RFC] hw/pc: set q35 as the default x86 machine, Daniel P . Berrangé, 2018/06/04
- Re: [Qemu-devel] [PATCH RFC] hw/pc: set q35 as the default x86 machine, Marcel Apfelbaum, 2018/06/04
- Re: [Qemu-devel] [PATCH RFC] hw/pc: set q35 as the default x86 machine, Eduardo Habkost, 2018/06/04
Re: [Qemu-devel] [PATCH RFC] hw/pc: set q35 as the default x86 machine, Marcel Apfelbaum, 2018/06/04