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| author | Paul Mackerras <paulus@ozlabs.org> | 2016-11-07 15:09:58 +1100 |
|---|---|---|
| committer | Sasha Levin <alexander.levin@verizon.com> | 2017-01-15 09:49:49 -0500 |
| commit | 7b0668db2acb4c6e136235e4734e6d6c22406edb (patch) | |
| tree | f4340fca69b5abf9ac823d3ba7f434c374313464 /Documentation | |
| parent | cefafbaa4a6ae8141182a7eb1d24e611483dfcb4 (diff) | |
KVM: PPC: Book3S HV: Save/restore XER in checkpointed register state
[ Upstream commit 0d808df06a44200f52262b6eb72bcb6042f5a7c5 ]
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>
Signed-off-by: Sasha Levin <alexander.levin@verizon.com>
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 702bb2557db8..20e6898d02c9 100644 --- a/Documentation/virtual/kvm/api.txt +++ b/Documentation/virtual/kvm/api.txt @@ -1919,6 +1919,7 @@ 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 ... |