KVM: PPC: PV wrteei

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

diff --git a/arch/powerpc/kernel/kvm.c b/arch/powerpc/kernel/kvm.c
index 8ac57e2..e936817 100644 (file)
--- a/arch/powerpc/kernel/kvm.c
+++ b/arch/powerpc/kernel/kvm.c
@@ -67,6 +67,9 @@
 #define KVM_INST_MTMSRD_L1     0x7c010164
 #define KVM_INST_MTMSR         0x7c000124
 
+#define KVM_INST_WRTEEI_0      0x7c000146
+#define KVM_INST_WRTEEI_1      0x7c008146
+
 static bool kvm_patching_worked = true;
 static char kvm_tmp[1024 * 1024];
 static int kvm_tmp_index;
@@ -221,6 +224,47 @@ static void kvm_patch_ins_mtmsr(u32 *inst, u32 rt)
        kvm_patch_ins_b(inst, distance_start);
 }
 
+#ifdef CONFIG_BOOKE
+
+extern u32 kvm_emulate_wrteei_branch_offs;
+extern u32 kvm_emulate_wrteei_ee_offs;
+extern u32 kvm_emulate_wrteei_len;
+extern u32 kvm_emulate_wrteei[];
+
+static void kvm_patch_ins_wrteei(u32 *inst)
+{
+       u32 *p;
+       int distance_start;
+       int distance_end;
+       ulong next_inst;
+
+       p = kvm_alloc(kvm_emulate_wrteei_len * 4);
+       if (!p)
+               return;
+
+       /* Find out where we are and put everything there */
+       distance_start = (ulong)p - (ulong)inst;
+       next_inst = ((ulong)inst + 4);
+       distance_end = next_inst - (ulong)&p[kvm_emulate_wrteei_branch_offs];
+
+       /* Make sure we only write valid b instructions */
+       if (distance_start > KVM_INST_B_MAX) {
+               kvm_patching_worked = false;
+               return;
+       }
+
+       /* Modify the chunk to fit the invocation */
+       memcpy(p, kvm_emulate_wrteei, kvm_emulate_wrteei_len * 4);
+       p[kvm_emulate_wrteei_branch_offs] |= distance_end & KVM_INST_B_MASK;
+       p[kvm_emulate_wrteei_ee_offs] |= (*inst & MSR_EE);
+       flush_icache_range((ulong)p, (ulong)p + kvm_emulate_wrteei_len * 4);
+
+       /* Patch the invocation */
+       kvm_patch_ins_b(inst, distance_start);
+}
+
+#endif
+
 static void kvm_map_magic_page(void *data)
 {
        kvm_hypercall2(KVM_HC_PPC_MAP_MAGIC_PAGE,
@@ -310,6 +354,12 @@ static void kvm_check_ins(u32 *inst)
        }
 
        switch (_inst) {
+#ifdef CONFIG_BOOKE
+       case KVM_INST_WRTEEI_0:
+       case KVM_INST_WRTEEI_1:
+               kvm_patch_ins_wrteei(inst);
+               break;
+#endif
        }
 }