On Wed, Jul 12, 2017 at 09:39:39AM +0300, Marcel Apfelbaum wrote:
On 11/07/2017 17:47, Paolo Bonzini wrote:
On 11/07/2017 16:42, Kevin Wolf wrote:
Concerning QEMU, could we maybe simply emit a warning a la
"you did not specify a machine type with the -M option, so you are currently running the the 'pc' machine type. Please note that future versions of QEMU might use the 'q35' machine type instead. If you require the 'pc' machine type for your setting, then please specify it with the -M option." Warnings tend to get ignored until things are actually break, so I don't think this helps much. I think simply not having a default machine type (as already suggested elsewhere in this thread) is the best way to deal with this. I would absolutely hate this. One of the nice things about qemu has always been that 'qemu disk.img' is enough to start a simple VM. You only need to touch any other options for things you care about. I wouldn't want to give this up.
I agree. Don't change anything, leave "-M pc" aside, and let libosinfo pick q35 for newer guests.
Hi Paolo,
While I do think it would be a good step moving forward, I am not convinced is "enough" to get more users using it. More so, a low level bug in upper layers (e.g. Open stack) will lead to difficulty to debug and result in the same "The machine is not steady enough, it doesn't worth the effort, let's move back to pc", or even frustration of the people that really need Q35.
I guess not being enough depends on which users we want to affect. People who run QEMU from the command-line don't get a virtio drive or a modern CPU model chosen by default, either. Is the choice of machine-type different? Why?
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-- Eduardo