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kvm: x86: Introduce APICv inhibit reason bits

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There are several reasons in which a VM needs to deactivate APICv
e.g. disable APICv via parameter during module loading, or when
enable Hyper-V SynIC support. Additional inhibit reasons will be
introduced later on when dynamic APICv is supported,

Introduce KVM APICv inhibit reason bits along with a new variable,
apicv_inhibit_reasons, to help keep track of APICv state for each VM,

Initially, the APICV_INHIBIT_REASON_DISABLE bit is used to indicate
the case where APICv is disabled during KVM module load.
(e.g. insmod kvm_amd avic=0 or insmod kvm_intel enable_apicv=0).

Signed-off-by: Suravee Suthikulpanit <suravee.suthikulpanit@amd.com>
[Do not use get_enable_apicv; consider irqchip_split in svm.c. - Paolo]
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Suravee Suthikulpanit 2019-11-14 14:15:05 -06:00 committed by Paolo Bonzini
parent b26a695a1d
commit 4e19c36f2d
4 changed files with 38 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

5
arch/x86/include/asm/kvm_host.h
View File

@ -873,6 +873,8 @@ enum kvm_irqchip_mode {
KVM_IRQCHIP_SPLIT, /* created with KVM_CAP_SPLIT_IRQCHIP */
};
#define APICV_INHIBIT_REASON_DISABLE 0
struct kvm_arch {
unsigned long n_used_mmu_pages;
unsigned long n_requested_mmu_pages;
@ -904,6 +906,7 @@ struct kvm_arch {
struct kvm_apic_map *apic_map;
bool apic_access_page_done;
unsigned long apicv_inhibit_reasons;
gpa_t wall_clock;
@ -1478,6 +1481,8 @@ gpa_t kvm_mmu_gva_to_gpa_system(struct kvm_vcpu *vcpu, gva_t gva,
struct x86_exception *exception);
void kvm_vcpu_deactivate_apicv(struct kvm_vcpu *vcpu);
bool kvm_apicv_activated(struct kvm *kvm);
void kvm_apicv_init(struct kvm *kvm, bool enable);
int kvm_emulate_hypercall(struct kvm_vcpu *vcpu);

14
arch/x86/kvm/svm.c
View File

@ -2052,6 +2052,18 @@ free_avic:
return err;
}
static int svm_vm_init(struct kvm *kvm)
{
if (avic) {
int ret = avic_vm_init(kvm);
if (ret)
return ret;
}
kvm_apicv_init(kvm, avic && irqchip_split(kvm));
return 0;
}
static inline int
avic_update_iommu_vcpu_affinity(struct kvm_vcpu *vcpu, int cpu, bool r)
{
@ -7274,7 +7286,7 @@ static struct kvm_x86_ops svm_x86_ops __ro_after_init = {
.vm_alloc = svm_vm_alloc,
.vm_free = svm_vm_free,
.vm_init = avic_vm_init,
.vm_init = svm_vm_init,
.vm_destroy = svm_vm_destroy,
.prepare_guest_switch = svm_prepare_guest_switch,

1
arch/x86/kvm/vmx/vmx.c
View File

@ -6813,6 +6813,7 @@ static int vmx_vm_init(struct kvm *kvm)
break;
}
}
kvm_apicv_init(kvm, enable_apicv);
return 0;
}

20
arch/x86/kvm/x86.c
View File

@ -7469,6 +7469,23 @@ void kvm_vcpu_deactivate_apicv(struct kvm_vcpu *vcpu)
kvm_x86_ops->refresh_apicv_exec_ctrl(vcpu);
}
bool kvm_apicv_activated(struct kvm *kvm)
{
return (READ_ONCE(kvm->arch.apicv_inhibit_reasons) == 0);
}
EXPORT_SYMBOL_GPL(kvm_apicv_activated);
void kvm_apicv_init(struct kvm *kvm, bool enable)
{
if (enable)
clear_bit(APICV_INHIBIT_REASON_DISABLE,
&kvm->arch.apicv_inhibit_reasons);
else
set_bit(APICV_INHIBIT_REASON_DISABLE,
&kvm->arch.apicv_inhibit_reasons);
}
EXPORT_SYMBOL_GPL(kvm_apicv_init);
static void kvm_sched_yield(struct kvm *kvm, unsigned long dest_id)
{
struct kvm_vcpu *target = NULL;
@ -9219,10 +9236,11 @@ int kvm_arch_vcpu_create(struct kvm_vcpu *vcpu)
return r;
if (irqchip_in_kernel(vcpu->kvm)) {
vcpu->arch.apicv_active = kvm_x86_ops->get_enable_apicv(vcpu->kvm);
r = kvm_create_lapic(vcpu, lapic_timer_advance_ns);
if (r < 0)
goto fail_mmu_destroy;
if (kvm_apicv_activated(vcpu->kvm))
vcpu->arch.apicv_active = true;
} else
static_key_slow_inc(&kvm_no_apic_vcpu);