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docs: Update POWER9 XIVE support for nested guests

Message ID 20200804131639.407049-1-clg@kaod.org
State New
Headers show
Series docs: Update POWER9 XIVE support for nested guests | expand

Commit Message

Cédric Le Goater Aug. 4, 2020, 1:16 p.m. UTC 
It is not yet supported.

Signed-off-by: Cédric Le Goater <clg@kaod.org>
---
 docs/specs/ppc-spapr-xive.rst | 5 +++++
 1 file changed, 5 insertions(+)
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Patch

diff --git a/docs/specs/ppc-spapr-xive.rst b/docs/specs/ppc-spapr-xive.rst
index 6159bc6eed62..7199db730b82 100644
--- a/docs/specs/ppc-spapr-xive.rst
+++ b/docs/specs/ppc-spapr-xive.rst
@@ -61,6 +61,11 @@  depend on the XIVE KVM capability of the host. On older kernels
 without XIVE KVM support, QEMU will use the emulated XIVE device as a
 fallback and on newer kernels (>=5.2), the KVM XIVE device.
 
+XIVE native exploitation mode is not supported for KVM nested guests,
+VMs running under a L1 hypervisor (KVM on pSeries). In that case, the
+hypervisor will not advertise the KVM capability and QEMU will use the
+emulated XIVE device, same as for older versions of KVM.
+
 As a final refinement, the user can also switch the use of the KVM
 device with the machine option ``kernel_irqchip``.