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>
diff --git a/arch/powerpc/kvm/book3s_interrupts.S b/arch/powerpc/kvm/book3s_interrupts.S
index 0a8515a..3e35383 100644
--- a/arch/powerpc/kvm/book3s_interrupts.S
+++ b/arch/powerpc/kvm/book3s_interrupts.S
@@ -84,6 +84,10 @@
/* 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 @@
PPC_LL r4, _LINK(r1)
mtlr r4
+ lwz r14, _CCR(r1)
+ mtcr r14
+
/* Restore non-volatile host registers (r14 - r31) */
REST_NVGPRS(r1)