KVM: PPC: Book3S HV: Make sure we don't re-enter guest without XIVE loaded

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commit 43ff3f6523 upstream.

This fixes a bug where it is possible to enter a guest on a POWER9
system without having the XIVE (interrupt controller) context loaded.
This can happen because we unload the XIVE context from the CPU
before doing the real-mode handling for machine checks.  After the
real-mode handler runs, it is possible that we re-enter the guest
via a fast path which does not load the XIVE context.

To fix this, we move the unloading of the XIVE context to come after
the real-mode machine check handler is called.

Fixes: 5af5099385 ("KVM: PPC: Book3S HV: Native usage of the XIVE interrupt controller")
Signed-off-by: Paul Mackerras <paulus@ozlabs.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

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Paul Mackerras 2018-01-11 14:31:43 +11:00 • committed by Greg Kroah-Hartman

parent fe90a3a6f8

commit 88b64450cc

1 changed files with 20 additions and 20 deletions

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arch/powerpc/kvm/book3s_hv_rmhandlers.S

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