[Qemu-devel] [RFC 3/4] Add l2ctlr cp register to CPUARMState

[Alvise Rigo <a.rigo@virtualopensystems.com>]

Since the irq bit seems to not be updated, exclude it from the check done
while copying data during migration.

Signed-off-by: Alvise Rigo <a.rigo@virtualopensystems.com>
---
 target-arm/cpu.c | 22 ++++++++++++++++++----
 1 file changed, 18 insertions(+), 4 deletions(-)

diff --git a/target-arm/cpu.c b/target-arm/cpu.c
index 6e7ce89..e8db00e 100644
--- a/target-arm/cpu.c
+++ b/target-arm/cpu.c
@@ -681,20 +681,34 @@ static void cortex_a9_initfn(Object *obj)
 }
 
 #ifndef CONFIG_USER_ONLY
-static uint64_t a15_l2ctlr_read(CPUARMState *env, const ARMCPRegInfo *ri)
+static void a15_l2ctlr_reset(CPUARMState *env, const ARMCPRegInfo *opaque)
 {
     /* Linux wants the number of processors from here.
      * Might as well set the interrupt-controller bit too.
      */
-    return ((smp_cpus - 1) << 24) | (1 << 23);
+    env->cp15.c9_l2ctlr = ((smp_cpus - 1) << 24) | (1 << 23);
+}
+
+static void a15_l2ctlr_write(CPUARMState *env, const ARMCPRegInfo *ri,
+                           uint64_t value)
+{
+    int smp_cpus_new = ((value >> 24) & 3);
+    int smp_cpus_old = ((env->cp15.c9_l2ctlr >> 24) & 3);
+
+    if (smp_cpus_new != smp_cpus_old) {
+        return;
+    }
+
+    env->cp15.c9_l2ctlr = value;
 }
 #endif
 
 static const ARMCPRegInfo cortexa15_cp_reginfo[] = {
 #ifndef CONFIG_USER_ONLY
     { .name = "L2CTLR", .cp = 15, .crn = 9, .crm = 0, .opc1 = 1, .opc2 = 2,
-      .access = PL1_RW, .resetvalue = 0, .readfn = a15_l2ctlr_read,
-      .writefn = arm_cp_write_ignore, },
+      .access = PL1_RW, .resetvalue = 0,
+      .resetfn = a15_l2ctlr_reset, .writefn = a15_l2ctlr_write,
+      .fieldoffset = offsetof(CPUARMState, cp15.c9_l2ctlr) },
 #endif
     { .name = "L2ECTLR", .cp = 15, .crn = 9, .crm = 0, .opc1 = 1, .opc2 = 3,
       .access = PL1_RW, .type = ARM_CP_CONST, .resetvalue = 0 },
-- 
1.8.3.2