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Re: [Qemu-devel] Re: [PATCH v2 9/9] Add -kvm option

From: Anthony Liguori
Subject: Re: [Qemu-devel] Re: [PATCH v2 9/9] Add -kvm option
Date: Thu, 08 Oct 2009 09:23:14 -0500
User-agent: Thunderbird (X11/20090825)

Avi Kivity wrote:
On 10/08/2009 01:00 AM, Anthony Liguori wrote:
Glauber Costa wrote:
This option deprecates --enable-kvm. It is a more flexible option,
that makes use of qemu-opts, and allow us to pass on options to enable or
disable kernel irqchip, for example.

With proper qdev support, you could select kvm device models based on -device so I think this option isn't all that useful.

qdev (mostly?) is about the guest interface; this is more about the host implementation, so akin to -drive file= and cache=.

If we make the kvm device a separate device, then it's about choosing which device to use.

Regardless, even if it were a single device, it's still a property of the device so a qdev property would be the logical way to expose it.

What I'd like to see in the interim is a kvm specific machine type that's defaulted to if kvm is enabled. I think this would be useful not only for enabling things like in-kernel apic, but also for selecting a default cpu model.

We should make a distinction between guest-visible changes and accelerators like kvm-irqchip and vhost.

They are different device models that happen to implement the same guest-visible device.


Anthony Liguori

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