[PATCH for-4.8] docs: document ACPI usage in PVHv2 guests

[Roger Pau Monne <roger.pau@citrix.com>]

It is possible for PVHv2 guests to get the hardware description from ACPI
tables, add this to the documentation also.

Signed-off-by: Roger Pau Monné <roger.pau@citrix.com>
---
Cc: Andrew Cooper <andrew.cooper3@citrix.com>
Cc: George Dunlap <George.Dunlap@eu.citrix.com>
Cc: Ian Jackson <ian.jackson@eu.citrix.com>
Cc: Jan Beulich <jbeulich@suse.com>
Cc: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Cc: Stefano Stabellini <sstabellini@kernel.org>
Cc: Tim Deegan <tim@xen.org>
Cc: Wei Liu <wei.liu2@citrix.com>
Cc: Boris Ostrovsky <boris.ostrovsky@oracle.com>
Cc: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
---
 docs/misc/hvmlite.markdown | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/docs/misc/hvmlite.markdown b/docs/misc/hvmlite.markdown
index 09051ee..946908e 100644
--- a/docs/misc/hvmlite.markdown
+++ b/docs/misc/hvmlite.markdown
@@ -64,3 +64,14 @@ The following VCPU hypercalls can be used in order to bring up secondary vCPUs:
  * `VCPUOP_down` is used to bring down a vCPU.
 
  * `VCPUOP_is_up` is used to scan the number of available vCPUs.
+
+## Hardware description ##
+
+PVHv2 guests that have access to hardware (either emulated or real) will also
+have ACPI tables with the description of the hardware that's available to the
+guest. This applies to both privileged and unprivileged guests. A hint of
+the position of the RSDP in memory (if present) can be fetched from the start
+info structure that's passed at boot time (field rsdp_paddr).
+
+Description of paravirtualized devices will come from XenStore, just as it's
+done for HVM guests.
-- 
2.7.4 (Apple Git-66)


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