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Message-Id: <deec01f358031b8fdcf17cfa3ff97ce1c6017ca7.1605232743.git.isaku.yamahata@intel.com>
Date: Mon, 16 Nov 2020 10:25:59 -0800
From: isaku.yamahata@...el.com
To: Thomas Gleixner <tglx@...utronix.de>,
Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
"H . Peter Anvin" <hpa@...or.com>,
Paolo Bonzini <pbonzini@...hat.com>,
Vitaly Kuznetsov <vkuznets@...hat.com>,
Wanpeng Li <wanpengli@...cent.com>,
Jim Mattson <jmattson@...gle.com>,
Joerg Roedel <joro@...tes.org>, x86@...nel.org,
linux-kernel@...r.kernel.org, kvm@...r.kernel.org
Cc: isaku.yamahata@...el.com, isaku.yamahata@...il.com,
Sean Christopherson <sean.j.christopherson@...el.com>
Subject: [RFC PATCH 14/67] KVM: Add max_vcpus field in common 'struct kvm'
From: Sean Christopherson <sean.j.christopherson@...el.com>
Signed-off-by: Sean Christopherson <sean.j.christopherson@...el.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
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