target/arm: Remove redundant DIV detection for KVM

KVM implies V7VE, which implies ARM_DIV and THUMB_DIV. The conditional
detection here is therefore unnecessary. Because V7VE is already
unconditionally specified for all KVM hosts, ARM_DIV and THUMB_DIV are
already indirectly specified and do not need to be included here at all.
Signed-off-by: NAaron Lindsay <alindsay@codeaurora.org>
Message-id: 1529699547-17044-6-git-send-email-alindsay@codeaurora.org
Signed-off-by: NPeter Maydell <peter.maydell@linaro.org>

target/arm/kvm32.c

@@ -36,7 +36,7 @@ bool kvm_arm_get_host_cpu_features(ARMHostCPUFeatures *ahcf)
      * and then query that CPU for the relevant ID registers.
      */
     int i, ret, fdarray[3];
-    uint32_t midr, id_pfr0, id_isar0, mvfr1;
+    uint32_t midr, id_pfr0, mvfr1;
     uint64_t features = 0;
     /* Old kernels may not know about the PREFERRED_TARGET ioctl: however
      * we know these will only support creating one kind of guest CPU,
@@ -58,11 +58,6 @@ bool kvm_arm_get_host_cpu_features(ARMHostCPUFeatures *ahcf)
             | ENCODE_CP_REG(15, 0, 0, 0, 1, 0, 0),
             .addr = (uintptr_t)&id_pfr0,
         },
-        {
-            .id = KVM_REG_ARM | KVM_REG_SIZE_U32
-            | ENCODE_CP_REG(15, 0, 0, 0, 2, 0, 0),
-            .addr = (uintptr_t)&id_isar0,
-        },
         {
             .id = KVM_REG_ARM | KVM_REG_SIZE_U32
             | KVM_REG_ARM_VFP | KVM_REG_ARM_VFP_MVFR1,
@@ -106,18 +101,6 @@ bool kvm_arm_get_host_cpu_features(ARMHostCPUFeatures *ahcf)
     set_feature(&features, ARM_FEATURE_VFP3);
     set_feature(&features, ARM_FEATURE_GENERIC_TIMER);
 
-    switch (extract32(id_isar0, 24, 4)) {
-    case 1:
-        set_feature(&features, ARM_FEATURE_THUMB_DIV);
-        break;
-    case 2:
-        set_feature(&features, ARM_FEATURE_ARM_DIV);
-        set_feature(&features, ARM_FEATURE_THUMB_DIV);
-        break;
-    default:
-        break;
-    }
-
     if (extract32(id_pfr0, 12, 4) == 1) {
         set_feature(&features, ARM_FEATURE_THUMB2EE);
     }