]> git.karo-electronics.de Git - linux-beck.git/commit
KVM: PPC: Book3S HV: Save/restore XER in checkpointed register state
authorPaul Mackerras <paulus@ozlabs.org>
Mon, 7 Nov 2016 04:09:58 +0000 (15:09 +1100)
committerPaul Mackerras <paulus@ozlabs.org>
Mon, 21 Nov 2016 04:17:55 +0000 (15:17 +1100)
commit0d808df06a44200f52262b6eb72bcb6042f5a7c5
tree45a53cb7a6cc31138db7e5ee027cb5a4f60b9558
parenta56ee9f8f01c5a11ced541f00c67646336f402b6
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: e4e38121507a ("KVM: PPC: Book3S HV: Add transactional memory support")
Fixes: 0a8eccefcb34 ("KVM: PPC: Book3S HV: Add missing code for transaction reclaim on guest exit")
Cc: stable@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>
Documentation/virtual/kvm/api.txt
arch/powerpc/include/asm/kvm_host.h
arch/powerpc/include/uapi/asm/kvm.h
arch/powerpc/kernel/asm-offsets.c
arch/powerpc/kvm/book3s_hv.c
arch/powerpc/kvm/book3s_hv_rmhandlers.S