diff options
| author | Alexander Graf <agraf@suse.de> | 2012-03-05 16:00:28 +0100 |
|---|---|---|
| committer | Paul Mackerras <paulus@samba.org> | 2012-04-03 08:42:34 +0200 |
| commit | e1f8acf8380abfd52aefbfa524e74af5ce0c8492 (patch) | |
| tree | 39f2637c1a941185003e9e270bf0b4580acde029 /arch/powerpc/kvm/book3s_interrupts.S | |
| parent | KVM: PPC: Book3S HV: Save and restore CR in __kvmppc_vcore_entry (diff) | |
| download | linux-e1f8acf8380abfd52aefbfa524e74af5ce0c8492.tar.xz linux-e1f8acf8380abfd52aefbfa524e74af5ce0c8492.zip | |
KVM: PPC: Save/Restore CR over vcpu_run
On PPC, CR2-CR4 are nonvolatile, thus have to be saved across function calls.
We didn't respect that for any architecture until Paul spotted it in his
patch for Book3S-HV. This patch saves/restores CR for all KVM capable PPC hosts.
Signed-off-by: Alexander Graf <agraf@suse.de>
Signed-off-by: Paul Mackerras <paulus@samba.org>
Diffstat (limited to 'arch/powerpc/kvm/book3s_interrupts.S')
| -rw-r--r-- | arch/powerpc/kvm/book3s_interrupts.S | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/arch/powerpc/kvm/book3s_interrupts.S b/arch/powerpc/kvm/book3s_interrupts.S index 0a8515a5c042..3e35383bdb21 100644 --- a/arch/powerpc/kvm/book3s_interrupts.S +++ b/arch/powerpc/kvm/book3s_interrupts.S @@ -84,6 +84,10 @@ kvm_start_entry: /* Save non-volatile registers (r14 - r31) */ SAVE_NVGPRS(r1) + /* Save CR */ + mfcr r14 + stw r14, _CCR(r1) + /* Save LR */ PPC_STL r0, _LINK(r1) @@ -165,6 +169,9 @@ kvm_exit_loop: PPC_LL r4, _LINK(r1) mtlr r4 + lwz r14, _CCR(r1) + mtcr r14 + /* Restore non-volatile host registers (r14 - r31) */ REST_NVGPRS(r1) |