target-arm: Add AArch64 ELR_EL1 register.

Add the AArch64 ELR_EL1 register.

Note that this does not live in env->cp15: for KVM migration
compatibility we need to migrate it separately rather than
as part of the system registers, because the KVM-to-userspace
interface puts it in the struct kvm_regs rather than making
them visible via the ONE_REG ioctls.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Peter Crosthwaite <peter.crosthwaite@xilinx.com>

1 files changed, 14 insertions, 1 deletions

diff --git a/target-arm/kvm64.c b/target-arm/kvm64.c
index 1b7ca90374..ee727487b8 100644
--- a/target-arm/kvm64.c
+++ b/target-arm/kvm64.c
@@ -144,9 +144,15 @@ int kvm_arch_put_registers(CPUState *cs, int level)
         return ret;
     }
 
+    reg.id = AARCH64_CORE_REG(elr_el1);
+    reg.addr = (uintptr_t) &env->elr_el1;
+    ret = kvm_vcpu_ioctl(cs, KVM_SET_ONE_REG, &reg);
+    if (ret) {
+        return ret;
+    }
+
     /* TODO:
      * SP_EL1
-     * ELR_EL1
      * SPSR[]
      * FP state
      * system registers
@@ -195,6 +201,13 @@ int kvm_arch_get_registers(CPUState *cs)
         return ret;
     }
 
+    reg.id = AARCH64_CORE_REG(elr_el1);
+    reg.addr = (uintptr_t) &env->elr_el1;
+    ret = kvm_vcpu_ioctl(cs, KVM_GET_ONE_REG, &reg);
+    if (ret) {
+        return ret;
+    }
+
     /* TODO: other registers */
     return ret;
 }