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

[Alexander Graf]

On 14.08.2013, at 20:27, Peter Maydell wrote:

> On 14 August 2013 19:21, Alexander Graf <address@hidden> wrote:
>> Everything -cpu host does has to be reproducible without -cpu host,
> 
> This is in general not going to be possible (the obvious case
> being "QEMU doesn't know about the host CPU type at all", or
> in minor variants "QEMU knows about the host CPU type but QEMU's
> version has a slightly different feature set").

That's a shortcoming in that particular version of QEMU then. The KVM interface 
still allows to do everything you could do with -cpu host with an explicit CPU 
define. If user space wants, it could write away the host CPU type and try to 
live migrate that machine to another machine then with the explicit target vcpu 
id.

Please keep in mind that we're talking about the generic KVM / user space 
interface here, not the actual QEMU implementation.


Alex