Re: [Xen-devel] Supporting default reads of host MSRs

[Matt Wilson <msw@xxxxxxxxx>]

On Mon, Oct 13, 2014 at 10:52:34AM +0100, Andrew Cooper wrote:
> 
> Having read this and put  two and two together, permitting default reads
> of host MSRs is irreconcilable against correctly supporting migration of
> HVM VMs.
> 
> In the past, XenServer has seen a handful of cases of a Window BSODs
> because of critical structure corruption in the IA32_MISC_ENABLE MSR. 
> They were unable to be seen again, but were on migration tests.
> 
> Exactly the same logic applies to the cpuid infrastructure, although
> that has many more noticeable problems atm.

I think it makes a lot of sense to be much more explicit about this
aspect of CPU virtualization.

--msw

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