Re: [Qemu-devel] [RFC 0/2] target-arm: Provide '-cpu host' when running KVM

[Alexander Graf]

On 14.08.2013, at 20:11, Peter Maydell wrote:

> On 14 August 2013 18:31, Alexander Graf <address@hidden> wrote:
>> So why not have a vm ioctl to fetch the "best match" vcpu type?
> 
> I don't object to that particularly, but
> (a) we're not going to use the extra flexibility because
>    the only thing we'll do is just bounce the answer
>    back at the kernel

It makes the API more robust to abuse. I think that's a good thing.

> (b) it requires an actual new ioctl rather than just
>    defining another supported value for the existing one

Yup :).

> (c) the code is less neat if you have to do "ask kernel
>    for best-match, if it has it use it otherwise fall
>    back to [small list of legacy cpus]" than if you
>    just have "try best-match/legacy1/legacy2/legacy3".

I don't understand this point. Could you please elaborate?


Alex