diff options
| author | Alexander Graf <agraf@suse.de> | 2010-07-29 14:48:02 +0200 |
|---|---|---|
| committer | Avi Kivity <avi@redhat.com> | 2010-10-24 10:50:54 +0200 |
| commit | 71ee8e34fe26252b11668a95708783ec9c58cbda (patch) | |
| tree | 98946257fc4672f55166b2c88a60137e7f4b9699 /arch/powerpc | |
| parent | 2d4f567103ff5a931e773f2e356b4eb303115deb (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')
| -rw-r--r-- | arch/powerpc/kernel/kvm.c | 14 |
1 files changed, 14 insertions, 0 deletions
diff --git a/arch/powerpc/kernel/kvm.c b/arch/powerpc/kernel/kvm.c index 926f93fd722..239a70d750a 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) 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; |