[v2,2/2] docs/system/ppc/powernv.rst: document KVM support status

Commit Message

Daniel Henrique Barboza Nov. 30, 2021, 1:31 p.m. UTC

Put in a more accessible place the reasoning behind our decision
to officially drop KVM support in the powernv machine.

Signed-off-by: Daniel Henrique Barboza <[e-mail]>
---
 docs/system/ppc/powernv.rst | 13 +++++++++++++
 1 file changed, 13 insertions(+)

Patch

diff --git a/docs/system/ppc/powernv.rst b/docs/system/ppc/powernv.rst
index 86186b7d2c..8304e85c51 100644
--- a/docs/system/ppc/powernv.rst
+++ b/docs/system/ppc/powernv.rst
@@ -58,6 +58,19 @@  Prebuilt images of ``skiboot`` and ``skiroot`` are made available on the `OpenPO
 QEMU includes a prebuilt image of ``skiboot`` which is updated when a
 more recent version is required by the models.
 
+Current acceleration status
+---------------------------
+
+KVM acceleration in Linux Power hosts is provided by the kvm-hv and
+kvm-pr modules. kvm-hv is adherent to PAPR and it's not compliant with
+powernv. kvm-pr in theory could be used as a valid accel option but
+this isn't supported by kvm-pr at this moment.
+
+To spare users from dealing with not so informative errors when attempting
+to use accel=kvm, the powernv machine will throw an error informing that
+KVM is not supported. This can be revisited in the future if kvm-pr (or
+any other KVM alternative) is usable as KVM accel for this machine.
+
 Boot options
 ------------