KVM: PPC: Introduce branch patching helper

[pandora-kernel.git] / arch / powerpc / kernel / kvm.c

diff --git a/arch/powerpc/kernel/kvm.c b/arch/powerpc/kernel/kvm.c
index 926f93f..239a70d 100644 (file)
--- a/arch/powerpc/kernel/kvm.c
+++ b/arch/powerpc/kernel/kvm.c
@@ -107,6 +107,20 @@ static void kvm_patch_ins_nop(u32 *inst)
        kvm_patch_ins(inst, KVM_INST_NOP);
 }
 
+static void kvm_patch_ins_b(u32 *inst, int addr)
+{
+#ifdef CONFIG_RELOCATABLE
+       /* On relocatable kernels interrupts handlers and our code
+          can be in different regions, so we don't patch them */
+
+       extern u32 __end_interrupts;
+       if ((ulong)inst < (ulong)&__end_interrupts)
+               return;
+#endif
+
+       kvm_patch_ins(inst, KVM_INST_B | (addr & KVM_INST_B_MASK));
+}
+
 static u32 *kvm_alloc(int len)
 {
        u32 *p;