Re: [Xen-devel] [PATCH v2 6/6] docs/pvh: document initial MTRR state

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 15.05.18 at 16:36, <roger.pau@xxxxxxxxxx> wrote:
> Provided to both Dom0 and DomUs.
> 
> Signed-off-by: Roger Pau Monné <roger.pau@xxxxxxxxxx>
> ---
> Cc: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
> Cc: George Dunlap <George.Dunlap@xxxxxxxxxxxxx>
> Cc: Ian Jackson <ian.jackson@xxxxxxxxxxxxx>
> Cc: Jan Beulich <jbeulich@xxxxxxxx>
> Cc: Julien Grall <julien.grall@xxxxxxx>
> Cc: Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>
> Cc: Stefano Stabellini <sstabellini@xxxxxxxxxx>
> Cc: Tim Deegan <tim@xxxxxxx>
> Cc: Wei Liu <wei.liu2@xxxxxxxxxx>
> ---
> Changes since v1:
>  - Add an extra paragraph to clarify the initial MTRR state.
> ---
>  docs/misc/pvh.markdown | 18 ++++++++++++++++++
>  1 file changed, 18 insertions(+)
> 
> diff --git a/docs/misc/pvh.markdown b/docs/misc/pvh.markdown
> index e85fb15374..fc31132618 100644
> --- a/docs/misc/pvh.markdown
> +++ b/docs/misc/pvh.markdown
> @@ -92,3 +92,21 @@ event channels. Delivery of those interrupts can be 
> configured in the same way
>  as HVM guests, check xen/include/public/hvm/params.h and
>  xen/include/public/hvm/hvm\_op.h for more information about available 
> delivery
>  methods.
> +
> +## MTRR ##
> +
> +### Unprivileged guests ###
> +
> +PVH guests are booted with the default MTRR type set to write-back and MTRR
> +enabled. This allows DomUs to start with a sane MTRR state. Note that this 
> will
> +have to be revisited when pci-passthrough is added to PVH in order to set 
> MMIO
> +regions as UC.
> +
> +Xen guarantees that RAM regions will always have the WB cache type set in the
> +initial MTRR state, either set by the default MTRR type or by other means.

While adding the second paragraph has helped, I still think the first one is 
lacking
"currently" or some such in the first sentence.

Jan


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