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| author | Paul Mackerras <paulus@ozlabs.org> | 2016-11-07 15:09:58 +1100 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2017-01-09 08:32:22 +0100 |
| commit | 75b1053c2b8c01baedf85f17be8455dadc63a383 (patch) | |
| tree | 26fc136c7aea8a815f0580e6a1b06c1583adfc31 /Documentation | |
| parent | 483eeca2cf389ea717cece86cce8494a050cb3f4 (diff) | |
KVM: PPC: Book3S HV: Save/restore XER in checkpointed register state
commit 0d808df06a44200f52262b6eb72bcb6042f5a7c5 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: e4e38121507a ("KVM: PPC: Book3S HV: Add transactional memory support")
Fixes: 0a8eccefcb34 ("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>
Diffstat (limited to 'Documentation')
| -rw-r--r-- | Documentation/virtual/kvm/api.txt | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/Documentation/virtual/kvm/api.txt b/Documentation/virtual/kvm/api.txt index 6bbceb9a3a19..1f5eab4ef88f 100644 --- a/Documentation/virtual/kvm/api.txt +++ b/Documentation/virtual/kvm/api.txt @@ -2050,6 +2050,7 @@ registers, find a list below: PPC | KVM_REG_PPC_TM_VSCR | 32 PPC | KVM_REG_PPC_TM_DSCR | 64 PPC | KVM_REG_PPC_TM_TAR | 64 + PPC | KVM_REG_PPC_TM_XER | 64 | | MIPS | KVM_REG_MIPS_R0 | 64 ... |