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RE: [Xen-devel] A simple question of CPU emulation in Xen

> Subject: RE: [Xen-devel] A simple question of CPU emulation in Xen
> From: Ian.Campbell@xxxxxxxxxx
> To: james.harper@xxxxxxxxxxxxxxxx
> CC: tinnycloud@xxxxxxxxxxx; xen-devel@xxxxxxxxxxxxxxxxxxx
> Date: Mon, 16 May 2011 09:04:15 +0100
> > > Could i have the configuration u refer to? In hvm file?
> > I did something like this to give my DomU the lowest common feature
> > set between my AMD and Intel based servers for live migration:
> >
> > cpuid = [ '0:eax=0x3,ebx=0x0,ecx=0x0,edx=0x0',
> > '1:eax=0x06b1,ecx=xxxxxxxxxxx0000xx00xxx0000000xx0,edx=xxx00000xxxxxxx0xxxxxxxxx0xxxxxx',
> > '4:eax=0x3,ebx=0x0,ecx=0x0,edx=0x0',
> > '0x80000000:eax=0x3,ebx=0x0,ecx=0x0,edx=0x0']
> >
> In addition to this xend syntax xl in 4.1 and later supports a more
> friendly syntax, described in the commit message for 22217:27c01a2e2a47.
> Ian.
Thanks Ian.
Will these impact domU performance behavior if I give a diffrernet CPU type and othere configurations(such as frequency, doubt this is supported)?

> > But I haven't tried it in a while so I can't tell if it still works as
> > it should. I do know that Silverlight won't install with the above
> > because it requires some feature that I've masked out.
> >
> > There are some other examples in the example configs I think.

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