Re: [Xen-devel] Porting of Guest OS

["Ronald G. Minnich" <rminnich@xxxxxxxx>]

On Fri, 31 Dec 2004, Keir Fraser wrote:

> A privileged domain can use the RDMSR/WRMSR Xen functions. In the
> unstable tree it can even execute RDMSR/WRMSR directly and Xen will
> emulate them.

no, I understand that, no problem there. It's just that we've looked at 
microcode update for years in linuxbios and it has a lot more impact than 
a simple MSR read/write. It seems you've looked at this one pretty 
carefully, however. 

> The main difficulty is that currently we only execute the MSR accesses
> on the CPU on which the domain is running. We could easily change the
> default to be to write to all CPUs -- that would make more sense for
> microcode updates, but I'm not sure if it would be silly for other
> things. 

That would be silly for just about everything. 

> The microcode driver is pretty small, so we may end up putting it in
> Xen, as we did with the MTRR code. 

It seems like a better way to go to me anyway ...

ron


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