KVM: PPC: Call SLB patching code in interrupt safe manner

[deliverable/linux.git] / arch / powerpc / kvm / book3s_64_rmhandlers.S

diff --git a/arch/powerpc/kvm/book3s_64_rmhandlers.S b/arch/powerpc/kvm/book3s_64_rmhandlers.S
index 9ad1c2645d6f7c2c6b1d96012aa47671127c87c7..e7091c9459a8b599a5c8c96e61e25ac0d20087ea 100644 (file)
--- a/arch/powerpc/kvm/book3s_64_rmhandlers.S
+++ b/arch/powerpc/kvm/book3s_64_rmhandlers.S
@@ -140,6 +140,24 @@ kvmppc_handler_lowmem_trampoline:
        blr
 kvmppc_handler_lowmem_trampoline_end:
 
+/*
+ * Call a function in real mode
+ *
+ * Input Registers:
+ *
+ * R3 = function
+ * R4 = MSR
+ * R5 = CTR
+ *
+ */
+_GLOBAL(kvmppc_rmcall)
+       mtmsr   r4              /* Disable relocation, so mtsrr
+                                  doesn't get interrupted */
+       mtctr   r5
+       mtsrr0  r3
+       mtsrr1  r4
+       RFI
+
 .global kvmppc_trampoline_lowmem
 kvmppc_trampoline_lowmem:
        .long kvmppc_handler_lowmem_trampoline - _stext