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KVM: remove kvm_vcpu_compatible

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The new created_vcpus field makes it possible to avoid the race between
irqchip and VCPU creation in a much nicer way; just check under kvm->lock
whether a VCPU has already been created.

We can then remove KVM_APIC_ARCHITECTURE too, because at this point the
symbol is only governing the default definition of kvm_vcpu_compatible.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Paolo Bonzini 2016-06-13 14:50:04 +02:00
parent 6c7caebc26
commit 557abc40d1
5 changed files with 3 additions and 22 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
arch/x86/kvm/Kconfig
View File

@ -32,7 +32,6 @@ config KVM
select HAVE_KVM_IRQ_BYPASS
select HAVE_KVM_IRQ_ROUTING
select HAVE_KVM_EVENTFD
select KVM_APIC_ARCHITECTURE
select KVM_ASYNC_PF
select USER_RETURN_NOTIFIER
select KVM_MMIO

11
arch/x86/kvm/x86.c
View File

@ -3774,7 +3774,7 @@ static int kvm_vm_ioctl_enable_cap(struct kvm *kvm,
r = -EEXIST;
if (irqchip_in_kernel(kvm))
goto split_irqchip_unlock;
if (atomic_read(&kvm->online_vcpus))
if (kvm->created_vcpus)
goto split_irqchip_unlock;
r = kvm_setup_empty_irq_routing(kvm);
if (r)
@ -3839,7 +3839,7 @@ long kvm_arch_vm_ioctl(struct file *filp,
if (kvm->arch.vpic)
goto create_irqchip_unlock;
r = -EINVAL;
if (atomic_read(&kvm->online_vcpus))
if (kvm->created_vcpus)
goto create_irqchip_unlock;
r = -ENOMEM;
vpic = kvm_create_pic(kvm);
@ -3995,7 +3995,7 @@ long kvm_arch_vm_ioctl(struct file *filp,
case KVM_SET_BOOT_CPU_ID:
r = 0;
mutex_lock(&kvm->lock);
if (atomic_read(&kvm->online_vcpus) != 0)
if (kvm->created_vcpus)
r = -EBUSY;
else
kvm->arch.bsp_vcpu_id = arg;
@ -7639,11 +7639,6 @@ bool kvm_vcpu_is_bsp(struct kvm_vcpu *vcpu)
return (vcpu->arch.apic_base & MSR_IA32_APICBASE_BSP) != 0;
}
bool kvm_vcpu_compatible(struct kvm_vcpu *vcpu)
{
return irqchip_in_kernel(vcpu->kvm) == lapic_in_kernel(vcpu);
}
struct static_key kvm_no_apic_vcpu __read_mostly;
EXPORT_SYMBOL_GPL(kvm_no_apic_vcpu);

6
include/linux/kvm_host.h
View File

@ -1105,12 +1105,6 @@ static inline int kvm_ioeventfd(struct kvm *kvm, struct kvm_ioeventfd *args)
#endif /* CONFIG_HAVE_KVM_EVENTFD */
#ifdef CONFIG_KVM_APIC_ARCHITECTURE
bool kvm_vcpu_compatible(struct kvm_vcpu *vcpu);
#else
static inline bool kvm_vcpu_compatible(struct kvm_vcpu *vcpu) { return true; }
#endif
static inline void kvm_make_request(int req, struct kvm_vcpu *vcpu)
{
/*

3
virt/kvm/Kconfig
View File

@ -16,9 +16,6 @@ config HAVE_KVM_EVENTFD
bool
select EVENTFD
config KVM_APIC_ARCHITECTURE
bool
config KVM_MMIO
bool

4
virt/kvm/kvm_main.c
View File

@ -2368,10 +2368,6 @@ static int kvm_vm_ioctl_create_vcpu(struct kvm *kvm, u32 id)
goto vcpu_destroy;
mutex_lock(&kvm->lock);
if (!kvm_vcpu_compatible(vcpu)) {
r = -EINVAL;
goto unlock_vcpu_destroy;
}
if (kvm_get_vcpu_by_id(kvm, id)) {
r = -EEXIST;
goto unlock_vcpu_destroy;