KVM: PPC: Book3S HV: XIVE: Set kvm->arch.xive when VPs are allocated

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If we cannot allocate the XIVE VPs in OPAL, the creation of a XIVE or
XICS-on-XIVE device is aborted as expected, but we leave kvm->arch.xive
set forever since the release method isn't called in this case. Any
subsequent tentative to create a XIVE or XICS-on-XIVE for this VM will
thus always fail (DoS). This is a problem for QEMU since it destroys
and re-creates these devices when the VM is reset: the VM would be
restricted to using the much slower emulated XIVE or XICS forever.

As an alternative to adding rollback, do not assign kvm->arch.xive before
making sure the XIVE VPs are allocated in OPAL.

Cc: stable@vger.kernel.org # v5.2
Fixes: 5422e95103 ("KVM: PPC: Book3S HV: XIVE: Replace the 'destroy' method by a 'release' method")
Signed-off-by: Greg Kurz <groug@kaod.org>
Reviewed-by: Cédric Le Goater <clg@kaod.org>
Signed-off-by: Paul Mackerras <paulus@ozlabs.org>

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Greg Kurz 2019-09-27 13:53:38 +02:00 • committed by Paul Mackerras

parent f41c4989c8

commit e7d71c9430

2 changed files with 6 additions and 7 deletions

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11

arch/powerpc/kvm/book3s_xive.c

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2

arch/powerpc/kvm/book3s_xive_native.c

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