[Qemu-devel] [PATCH v3 08/11] AARCH64: Enable SMP support for aarch64 processors using PSCI method

["Mian M. Hamayun" <m.hamayun@virtualopensystems.com>]

From: "Mian M. Hamayun" <m.hamayun@virtualopensystems.com>

We enable SMP support for aarch64 processors using the PSCI method,
by setting the appropriate CPU feature flags at initilializtion time.

Secondary boot code for non-aarch64 processors is disabled in case
of compilation for aarch64.

Signed-off-by: Mian M. Hamayun <m.hamayun@virtualopensystems.com>
---
 hw/arm/boot.c       | 4 ++++
 target-arm/kvm_64.c | 7 +++++++
 2 files changed, 11 insertions(+)

diff --git a/hw/arm/boot.c b/hw/arm/boot.c
index 0471eb8..ddafd3b 100644
--- a/hw/arm/boot.c
+++ b/hw/arm/boot.c
@@ -157,6 +157,7 @@ static void setup_boot_env(ARMCPU *cpu)
 static void default_write_secondary(ARMCPU *cpu,
                                     const struct arm_boot_info *info)
 {
+#ifndef TARGET_AARCH64
     int n;
     smpboot[smpboot_array_size - 1] = info->smp_bootreg_addr;
     smpboot[smpboot_array_size - 2] = info->gic_cpu_if_addr;
@@ -171,15 +172,18 @@ static void default_write_secondary(ARMCPU *cpu,
     rom_add_blob_fixed("smpboot", smpboot,
                        smpboot_array_size * sizeof(uint32_t),
                        info->smp_loader_start);
+#endif
 }
 
 static void default_reset_secondary(ARMCPU *cpu,
                                     const struct arm_boot_info *info)
 {
+#ifndef TARGET_AARCH64
     CPUARMState *env = &cpu->env;
 
     stl_phys_notdirty(info->smp_bootreg_addr, 0);
     env->regs[15] = info->smp_loader_start;
+#endif
 }
 
 #define WRITE_WORD(p, value) do { \
diff --git a/target-arm/kvm_64.c b/target-arm/kvm_64.c
index 9685727..146b7c4 100644
--- a/target-arm/kvm_64.c
+++ b/target-arm/kvm_64.c
@@ -27,12 +27,19 @@ static uint32_t kvm_arm_targets[KVM_ARM_NUM_TARGETS] = {
     KVM_ARM_TARGET_CORTEX_A57
 };
 
+#define ARM_VCPU_FEATURE_FLAGS(cpuid, is_aarch32)  		\
+((!!(cpuid) << KVM_ARM_VCPU_POWER_OFF) | (is_aarch32 << KVM_ARM_VCPU_EL1_32BIT))
+
 int kvm_arch_init_vcpu(CPUState *cs)
 {
     struct kvm_vcpu_init init;
     int ret, i;
 
+    ARMCPU *cpu = ARM_CPU(cs);
+    CPUARMState *env = &cpu->env;
+
     memset(init.features, 0, sizeof(init.features));
+    init.features[0] = ARM_VCPU_FEATURE_FLAGS(cs->cpu_index, !env->aarch64);
     /* Find an appropriate target CPU type.
      * KVM does not provide means to detect the host CPU type on aarch64,
      * and simply refuses to initialize, if the CPU type mis-matches;
-- 
1.8.1.2