Paul Mackerras 0d808df06a
KVM: PPC: Book3S HV: Save/restore XER in checkpointed register state ...
When switching from/to a guest that has a transaction in progress,
we need to save/restore the checkpointed register state. Although
XER is part of the CPU state that gets checkpointed, the code that
does this saving and restoring doesn't save/restore XER.
This fixes it by saving and restoring the XER. To allow userspace
to read/write the checkpointed XER value, we also add a new ONE_REG
specifier.
The visible effect of this bug is that the guest may see its XER
value being corrupted when it uses transactions.
Fixes: e4e38121500a8eccefcbstable@vger.kernel.org # v3.15+
Signed-off-by: Paul Mackerras <paulus@ozlabs.org >
Reviewed-by: Thomas Huth <thuth@redhat.com >
Signed-off-by: Paul Mackerras <paulus@ozlabs.org >
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Paul Mackerras
0d808df06a
