Re: [PATCH 2/2] introduce -cpu host target

[Avi Kivity <avi@redhat.com>]

On 06/23/2009 12:47 AM, Andre Przywara wrote:
> Although the guest's CPUID bits can be controlled in a fine grained way
> in QEMU, a simple way to inject the host CPU is missing. This is handy
> for KVM desktop virtualization, where one wants the guest to support the
> full host feature set.
> Introduce another CPU type called 'host', which will propagate the host's
> CPUID bits to the guest. Problematic bits can still be turned off by using
> the existing syntax (-cpu host,-skinit)
>    

kvm already knows how to filter unknown bits to prevent runtime 
failures.  This is even more important for qemu/tcg, since even simple 
bits which only define new instructions need explicit support in qemu.  
I think -cpu host should default to filtering unsupported bits instead 
of hoping the guest will ignore them or expecting the user to know which 
bits to remove.

-- 
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