Re: [Xen-devel] [PATCH v2] x86/vmx: Add command line option to enable EPT without PAT

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 17.04.14 at 00:52, <aravindp@xxxxxxxxx> wrote:
> --- a/docs/misc/xen-command-line.markdown
> +++ b/docs/misc/xen-command-line.markdown
> @@ -523,6 +523,20 @@ Either force retrieval of monitor EDID information via 
> VESA DDC, or
>  disable it (edid=no). This option should not normally be required
>  except for debugging purposes.
>  
> +### ept\_without\_pat (Intel)
> +> `= <boolean>`
> +
> +> Default: `false`
> +
> +Allow EPT to be enabled when PAT is not present. 

This is a little too broad and hence confusing statement: I'm pretty
certain PAT (the MSR) gets implemented/emulated by hypervisors.
What's needed here (and potentially missing in emulations) is the
VMX feature VM_ENTRY_LOAD_GUEST_PAT, and it should be said
so.

Jan


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