Re: [Xen-devel] Xen HVM regression on certain Intel CPUs

[Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>]

On Wed, 27 Mar 2013, Stefan Bader wrote:
> On 27.03.2013 17:09, H. Peter Anvin wrote:
> > When you say Xen HVM, am I correct in assuming that neither CPUID nor
> > CR4 operations in the main kernel are run through paravirt_ops?
> 
> Not paravirt ops likely but the hypervisor traps access. At least cpuid from
> within a hvm guest I expect to be filtered. So when checking things I went to
> bare-metal.

That's right.
Both cr4 and cpuid are trapped, so from the Linux POV they look like
native ops, no paravirt_ops involved.

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