[RFC PATCH 14/67] KVM: Add max_vcpus field in common 'struct kvm'

[isaku . yamahata]

From: Sean Christopherson <sean.j.christopher...@intel.com>

Signed-off-by: Sean Christopherson <sean.j.christopher...@intel.com>
---
 arch/arm64/include/asm/kvm_host.h | 3 ---
 arch/arm64/kvm/arm.c              | 7 ++-----
 arch/arm64/kvm/vgic/vgic-init.c   | 6 +++---
 include/linux/kvm_host.h          | 1 +
 virt/kvm/kvm_main.c               | 3 ++-
 5 files changed, 8 insertions(+), 12 deletions(-)

diff --git a/arch/arm64/include/asm/kvm_host.h 
b/arch/arm64/include/asm/kvm_host.h
index 781d029b8aa8..259b05376807 100644
--- a/arch/arm64/include/asm/kvm_host.h
+++ b/arch/arm64/include/asm/kvm_host.h
@@ -95,9 +95,6 @@ struct kvm_arch {
        /* VTCR_EL2 value for this VM */
        u64    vtcr;
 
-       /* The maximum number of vCPUs depends on the used GIC model */
-       int max_vcpus;
-
        /* Interrupt controller */
        struct vgic_dist        vgic;
 
diff --git a/arch/arm64/kvm/arm.c b/arch/arm64/kvm/arm.c
index 5750ec34960e..b3ba6c66183d 100644
--- a/arch/arm64/kvm/arm.c
+++ b/arch/arm64/kvm/arm.c
@@ -125,7 +125,7 @@ int kvm_arch_init_vm(struct kvm *kvm, unsigned long type)
        kvm_vgic_early_init(kvm);
 
        /* The maximum number of VCPUs is limited by the host's GIC model */
-       kvm->arch.max_vcpus = kvm_arm_default_max_vcpus();
+       kvm->max_vcpus = kvm_arm_default_max_vcpus();
 
        return ret;
 out_free_stage2_pgd:
@@ -193,7 +193,7 @@ int kvm_vm_ioctl_check_extension(struct kvm *kvm, long ext)
        case KVM_CAP_MAX_VCPUS:
        case KVM_CAP_MAX_VCPU_ID:
                if (kvm)
-                       r = kvm->arch.max_vcpus;
+                       r = kvm->max_vcpus;
                else
                        r = kvm_arm_default_max_vcpus();
                break;
@@ -247,9 +247,6 @@ int kvm_arch_vcpu_precreate(struct kvm *kvm, unsigned int 
id)
        if (irqchip_in_kernel(kvm) && vgic_initialized(kvm))
                return -EBUSY;
 
-       if (id >= kvm->arch.max_vcpus)
-               return -EINVAL;
-
        return 0;
 }
 
diff --git a/arch/arm64/kvm/vgic/vgic-init.c b/arch/arm64/kvm/vgic/vgic-init.c
index 32e32d67a127..9af003b62509 100644
--- a/arch/arm64/kvm/vgic/vgic-init.c
+++ b/arch/arm64/kvm/vgic/vgic-init.c
@@ -97,11 +97,11 @@ int kvm_vgic_create(struct kvm *kvm, u32 type)
        ret = 0;
 
        if (type == KVM_DEV_TYPE_ARM_VGIC_V2)
-               kvm->arch.max_vcpus = VGIC_V2_MAX_CPUS;
+               kvm->max_vcpus = VGIC_V2_MAX_CPUS;
        else
-               kvm->arch.max_vcpus = VGIC_V3_MAX_CPUS;
+               kvm->max_vcpus = VGIC_V3_MAX_CPUS;
 
-       if (atomic_read(&kvm->online_vcpus) > kvm->arch.max_vcpus) {
+       if (atomic_read(&kvm->online_vcpus) > kvm->max_vcpus) {
                ret = -E2BIG;
                goto out_unlock;
        }
diff --git a/include/linux/kvm_host.h b/include/linux/kvm_host.h
index ad9b6963d19d..95371750c23f 100644
--- a/include/linux/kvm_host.h
+++ b/include/linux/kvm_host.h
@@ -467,6 +467,7 @@ struct kvm {
         * and is accessed atomically.
         */
        atomic_t online_vcpus;
+       int max_vcpus;
        int created_vcpus;
        int last_boosted_vcpu;
        struct list_head vm_list;
diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
index b29b6c3484dd..3dc41b6e12a0 100644
--- a/virt/kvm/kvm_main.c
+++ b/virt/kvm/kvm_main.c
@@ -752,6 +752,7 @@ static struct kvm *kvm_create_vm(unsigned long type)
        mutex_init(&kvm->irq_lock);
        mutex_init(&kvm->slots_lock);
        INIT_LIST_HEAD(&kvm->devices);
+       kvm->max_vcpus = KVM_MAX_VCPUS;
 
        BUILD_BUG_ON(KVM_MEM_SLOTS_NUM > SHRT_MAX);
 
@@ -3098,7 +3099,7 @@ static int kvm_vm_ioctl_create_vcpu(struct kvm *kvm, u32 
id)
                return -EINVAL;
 
        mutex_lock(&kvm->lock);
-       if (kvm->created_vcpus == KVM_MAX_VCPUS) {
+       if (kvm->created_vcpus >= kvm->max_vcpus) {
                mutex_unlock(&kvm->lock);
                return -EINVAL;
        }
-- 
2.17.1