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Paul Mackerras 75b1053c2b KVM: PPC: Book3S HV: Save/restore XER in checkpointed register state

commit 0d808df06a upstream.

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: e4e3812150 ("KVM: PPC: Book3S HV: Add transactional memory support")
Fixes: 0a8eccefcb ("KVM: PPC: Book3S HV: Add missing code for transaction reclaim on guest exit")
Signed-off-by: Paul Mackerras <paulus@ozlabs.org>
Reviewed-by: Thomas Huth <thuth@redhat.com>
Signed-off-by: Paul Mackerras <paulus@ozlabs.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

2017-01-09 08:32:22 +01:00

arm

arm/arm64: KVM: Add forwarded physical interrupts documentation

2015-10-22 23:01:43 +02:00

devices

KVM: arm64: Require in-kernel irqchip for PMU support

2016-09-27 18:57:07 +02:00

00-INDEX

Documentation/: update 00-INDEX files

2014-02-10 16:01:40 -08:00

api.txt

KVM: PPC: Book3S HV: Save/restore XER in checkpointed register state