Patchwork [22/27] KVM: PPC: Introduce branch patching helper

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Submitter Alexander Graf
Date July 1, 2010, 10:42 a.m.
Message ID <1277980982-12433-23-git-send-email-agraf@suse.de>
Download mbox | patch
Permalink /patch/57525/
State Not Applicable
Headers show

Comments

Alexander Graf - July 1, 2010, 10:42 a.m.
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>
---
 arch/powerpc/kernel/kvm.c |    5 +++++
 1 files changed, 5 insertions(+), 0 deletions(-)

Patch

diff --git a/arch/powerpc/kernel/kvm.c b/arch/powerpc/kernel/kvm.c
index 75c9e0b..337e3e5 100644
--- a/arch/powerpc/kernel/kvm.c
+++ b/arch/powerpc/kernel/kvm.c
@@ -106,6 +106,11 @@  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)
+{
+	kvm_patch_ins(inst, KVM_INST_B | (addr & KVM_INST_B_MASK));
+}
+
 static u32 *kvm_alloc(int len)
 {
 	u32 *p;