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docs: Update POWER9 XIVE support for nested guests 

It is not yet supported.

Signed-off-by: Cédric Le Goater <clg@kaod.org>
Message-Id: <20200804131639.407049-1-clg@kaod.org>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
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Cédric Le Goater 2020-08-04 15:16:39 +02:00 committed by David Gibson
parent 61f5e1a34d
commit 8d14523b1c
1 changed files with 5 additions and 0 deletions
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docs/specs/ppc-spapr-xive.rst
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@ -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``.