aboutsummaryrefslogtreecommitdiffstats
path: root/arch/powerpc/kernel/kvm.c
diff options
context:
space:
mode:
authorAlexander Graf <agraf@suse.de>2010-07-29 08:48:02 -0400
committerAvi Kivity <avi@redhat.com>2010-10-24 04:50:54 -0400
commit71ee8e34fe26252b11668a95708783ec9c58cbda (patch)
tree98946257fc4672f55166b2c88a60137e7f4b9699 /arch/powerpc/kernel/kvm.c
parent2d4f567103ff5a931e773f2e356b4eb303115deb (diff)
KVM: PPC: Introduce branch patching helper
We will need to patch several instruction streams over to a different code path, so we need a way to patch a single instruction with a branch somewhere else. This patch adds a helper to facilitate this patching. Signed-off-by: Alexander Graf <agraf@suse.de> Signed-off-by: Avi Kivity <avi@redhat.com>
Diffstat (limited to 'arch/powerpc/kernel/kvm.c')
-rw-r--r--arch/powerpc/kernel/kvm.c14
1 files changed, 14 insertions, 0 deletions
diff --git a/arch/powerpc/kernel/kvm.c b/arch/powerpc/kernel/kvm.c
index 926f93fd722d..239a70d750a2 100644
--- a/arch/powerpc/kernel/kvm.c
+++ b/arch/powerpc/kernel/kvm.c
@@ -107,6 +107,20 @@ static void kvm_patch_ins_nop(u32 *inst)
107 kvm_patch_ins(inst, KVM_INST_NOP); 107 kvm_patch_ins(inst, KVM_INST_NOP);
108} 108}
109 109
110static void kvm_patch_ins_b(u32 *inst, int addr)
111{
112#ifdef CONFIG_RELOCATABLE
113 /* On relocatable kernels interrupts handlers and our code
114 can be in different regions, so we don't patch them */
115
116 extern u32 __end_interrupts;
117 if ((ulong)inst < (ulong)&__end_interrupts)
118 return;
119#endif
120
121 kvm_patch_ins(inst, KVM_INST_B | (addr & KVM_INST_B_MASK));
122}
123
110static u32 *kvm_alloc(int len) 124static u32 *kvm_alloc(int len)
111{ 125{
112 u32 *p; 126 u32 *p;