diff options
| author | Greg Kurz <groug@kaod.org> | 2019-06-13 18:45:05 +0200 |
|---|---|---|
| committer | David Gibson <david@gibson.dropbear.id.au> | 2019-07-02 09:43:58 +1000 |
| commit | 7abc0c6d35306a41a48eda7ab2b7b2d51f32f86b (patch) | |
| tree | 439604b99e2dbb8b21870775b35a79af91fd7fa3 /docs/specs | |
| parent | d9293c4843b2503c905d35899077fc415824783e (diff) | |
xics/spapr: Detect old KVM XICS on POWER9 hosts
Older KVMs on POWER9 don't support destroying/recreating a KVM XICS
device, which is required by 'dual' interrupt controller mode. This
causes QEMU to emit a warning when the guest is rebooted and to fall
back on XICS emulation:
qemu-system-ppc64: warning: kernel_irqchip allowed but unavailable:
Error on KVM_CREATE_DEVICE for XICS: File exists
If kernel irqchip is required, QEMU will thus exit when the guest is
first rebooted. Failing QEMU this late may be a painful experience
for the user.
Detect that and exit at machine init instead.
Signed-off-by: Greg Kurz <groug@kaod.org>
Message-Id: <156044430517.125694.6207865998817342638.stgit@bahia.lab.toulouse-stg.fr.ibm.com>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
Diffstat (limited to 'docs/specs')
| -rw-r--r-- | docs/specs/ppc-spapr-xive.rst | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/docs/specs/ppc-spapr-xive.rst b/docs/specs/ppc-spapr-xive.rst index 7a64c9d049..6159bc6eed 100644 --- a/docs/specs/ppc-spapr-xive.rst +++ b/docs/specs/ppc-spapr-xive.rst @@ -142,8 +142,8 @@ xics XICS KVM XICS emul. XICS KVM (3) QEMU fails at CAS with ``Guest requested unavailable interrupt mode (XICS), either don't set the ic-mode machine property or try ic-mode=xics or ic-mode=dual`` -(4) QEMU/KVM incompatibility due to device destruction in reset. This - needs to be addressed more cleanly with an error. +(4) QEMU/KVM incompatibility due to device destruction in reset. QEMU fails + with ``KVM is too old to support ic-mode=dual,kernel-irqchip=on`` XIVE Device tree properties |