[Qemu-devel] [RFC PATCH V3 6/7] target-arm: Common kvm_arm_vcpu_init() for KVM ARM and KVM ARM64

[Pranavkumar Sawargaonkar <pranavkumar@linaro.org>]

Introduce a common kvm_arm_vcpu_init() for doing KVM_ARM_VCPU_INIT
ioctl in KVM ARM and KVM ARM64. This also helps us factor-out few
common code lines from kvm_arch_init_vcpu() for KVM ARM/ARM64.

Signed-off-by: Pranavkumar Sawargaonkar <pranavkumar@linaro.org>
Signed-off-by: Anup Patel <anup.patel@linaro.org>
---
 target-arm/kvm.c     |   23 +++++++++++++++++++++++
 target-arm/kvm32.c   |   18 +++---------------
 target-arm/kvm64.c   |   22 ++++++++--------------
 target-arm/kvm_arm.h |   14 ++++++++++++++
 4 files changed, 48 insertions(+), 29 deletions(-)

diff --git a/target-arm/kvm.c b/target-arm/kvm.c
index 39202d7..55bc3a3 100644
--- a/target-arm/kvm.c
+++ b/target-arm/kvm.c
@@ -27,6 +27,29 @@ const KVMCapabilityInfo kvm_arch_required_capabilities[] = {
     KVM_CAP_LAST_INFO
 };
 
+int kvm_arm_vcpu_init(CPUState *cs, uint32_t feature0_extra)
+{
+    ARMCPU *cpu = ARM_CPU(cs);
+    struct kvm_vcpu_init init;
+
+    if (cpu->kvm_target == QEMU_KVM_ARM_TARGET_NONE) {
+        fprintf(stderr, "KVM is not supported for this guest CPU type\n");
+        return -EINVAL;
+    }
+
+    init.target = cpu->kvm_target;
+    memset(init.features, 0, sizeof(init.features));
+    if (cpu->start_powered_off) {
+        init.features[0] |= 1 << KVM_ARM_VCPU_POWER_OFF;
+    }
+    if (kvm_check_extension(cs->kvm_state, KVM_CAP_ARM_PSCI_0_2)) {
+        init.features[0] |= 1 << KVM_ARM_VCPU_PSCI_0_2;
+    }
+    init.features[0] |= feature0_extra;
+
+    return kvm_vcpu_ioctl(cs, KVM_ARM_VCPU_INIT, &init);
+}
+
 bool kvm_arm_create_scratch_host_vcpu(const uint32_t *cpus_to_try,
                                       int *fdarray,
                                       struct kvm_vcpu_init *init)
diff --git a/target-arm/kvm32.c b/target-arm/kvm32.c
index afeff01..aa9facc 100644
--- a/target-arm/kvm32.c
+++ b/target-arm/kvm32.c
@@ -165,7 +165,6 @@ static int compare_u64(const void *a, const void *b)
 
 int kvm_arch_init_vcpu(CPUState *cs)
 {
-    struct kvm_vcpu_init init;
     int i, ret, arraylen;
     uint64_t v;
     struct kvm_one_reg r;
@@ -173,23 +172,12 @@ int kvm_arch_init_vcpu(CPUState *cs)
     struct kvm_reg_list *rlp;
     ARMCPU *cpu = ARM_CPU(cs);
 
-    if (cpu->kvm_target == QEMU_KVM_ARM_TARGET_NONE) {
-        fprintf(stderr, "KVM is not supported for this guest CPU type\n");
-        return -EINVAL;
-    }
-
-    init.target = cpu->kvm_target;
-    memset(init.features, 0, sizeof(init.features));
-    if (cpu->start_powered_off) {
-        init.features[0] |= 1 << KVM_ARM_VCPU_POWER_OFF;
-    }
-    if (kvm_check_extension(cs->kvm_state, KVM_CAP_ARM_PSCI_0_2)) {
-        init.features[0] |= 1 << KVM_ARM_VCPU_PSCI_0_2;
-    }
-    ret = kvm_vcpu_ioctl(cs, KVM_ARM_VCPU_INIT, &init);
+    /* Do KVM_ARM_VCPU_INIT ioctl */
+    ret = kvm_arm_vcpu_init(cs, 0x0);
     if (ret) {
         return ret;
     }
+
     /* Query the kernel to make sure it supports 32 VFP
      * registers: QEMU's "cortex-a15" CPU is always a
      * VFP-D32 core. The simplest way to do this is just
diff --git a/target-arm/kvm64.c b/target-arm/kvm64.c
index 02bba45..b0490dd 100644
--- a/target-arm/kvm64.c
+++ b/target-arm/kvm64.c
@@ -77,29 +77,23 @@ bool kvm_arm_get_host_cpu_features(ARMHostCPUClass *ahcc)
 
 int kvm_arch_init_vcpu(CPUState *cs)
 {
-    ARMCPU *cpu = ARM_CPU(cs);
-    struct kvm_vcpu_init init;
     int ret;
+    ARMCPU *cpu = ARM_CPU(cs);
 
-    if (cpu->kvm_target == QEMU_KVM_ARM_TARGET_NONE ||
-        !arm_feature(&cpu->env, ARM_FEATURE_AARCH64)) {
-        fprintf(stderr, "KVM is not supported for this guest CPU type\n");
+    if (!arm_feature(&cpu->env, ARM_FEATURE_AARCH64)) {
+        fprintf(stderr, "KVM only support Aarch64 CPU type\n");
         return -EINVAL;
     }
 
-    init.target = cpu->kvm_target;
-    memset(init.features, 0, sizeof(init.features));
-    if (cpu->start_powered_off) {
-        init.features[0] |= 1 << KVM_ARM_VCPU_POWER_OFF;
-    }
-    if (kvm_check_extension(cs->kvm_state, KVM_CAP_ARM_PSCI_0_2)) {
-        init.features[0] |= 1 << KVM_ARM_VCPU_PSCI_0_2;
+    /* Do KVM_ARM_VCPU_INIT ioctl */
+    ret = kvm_arm_vcpu_init(cs, 0x0);
+    if (ret) {
+        return ret;
     }
-    ret = kvm_vcpu_ioctl(cs, KVM_ARM_VCPU_INIT, &init);
 
     /* TODO : support for save/restore/reset of system regs via tuple list */
 
-    return ret;
+    return 0;
 }
 
 #define AARCH64_CORE_REG(x)   (KVM_REG_ARM64 | KVM_REG_SIZE_U64 | \
diff --git a/target-arm/kvm_arm.h b/target-arm/kvm_arm.h
index 137c567..1889ba1 100644
--- a/target-arm/kvm_arm.h
+++ b/target-arm/kvm_arm.h
@@ -15,6 +15,20 @@
 #include "exec/memory.h"
 
 /**
+ * kvm_arm_vcpu_init:
+ * @cs: CPUState
+ * @feature0_extra: additional features
+ *
+ * KVM ARM and KVM ARM64 need to use KVM_ARM_VCPU_INIT ioctl for
+ * init/re-init/reset the VCPU with given feature flags.
+ * This is a common function for doing KVM_ARM_VCPU_INIT ioctl
+ * independent of KVM ARM or KVM ARM64.
+ *
+ * Returns: 0 if success else < 0 error code
+ */
+int kvm_arm_vcpu_init(CPUState *cs, uint32_t feature0_extra);
+
+/**
  * kvm_arm_register_device:
  * @mr: memory region for this device
  * @devid: the KVM device ID
-- 
1.7.9.5