From 6723676c2651a40855e37861315569892fa2b923 Mon Sep 17 00:00:00 2001 From: Roger Pau Monne Date: Thu, 3 Nov 2016 13:19:03 +0100 Subject: [PATCH] docs: document ACPI usage in PVHv2 guests MIME-Version: 1.0 Content-Type: text/plain; charset=utf8 Content-Transfer-Encoding: 8bit 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 Reviewed-by: Andrew Cooper Release-acked-by: Wei Liu --- docs/misc/hvmlite.markdown | 11 +++++++++++ 1 file changed, 11 insertions(+) diff --git a/docs/misc/hvmlite.markdown b/docs/misc/hvmlite.markdown index 09051ee2f0..946908ee6e 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. -- 2.30.2