diff options
Diffstat (limited to 'arch/x86/kvm/lapic.c')
| -rw-r--r-- | arch/x86/kvm/lapic.c | 35 |
1 files changed, 35 insertions, 0 deletions
diff --git a/arch/x86/kvm/lapic.c b/arch/x86/kvm/lapic.c index 3ed74ad60516..e73386c26d2c 100644 --- a/arch/x86/kvm/lapic.c +++ b/arch/x86/kvm/lapic.c @@ -2435,6 +2435,41 @@ void kvm_apic_update_apicv(struct kvm_vcpu *vcpu) apic->highest_isr_cache = -1; } +int kvm_alloc_apic_access_page(struct kvm *kvm) +{ + struct page *page; + void __user *hva; + int ret = 0; + + mutex_lock(&kvm->slots_lock); + if (kvm->arch.apic_access_memslot_enabled) + goto out; + + hva = __x86_set_memory_region(kvm, APIC_ACCESS_PAGE_PRIVATE_MEMSLOT, + APIC_DEFAULT_PHYS_BASE, PAGE_SIZE); + if (IS_ERR(hva)) { + ret = PTR_ERR(hva); + goto out; + } + + page = gfn_to_page(kvm, APIC_DEFAULT_PHYS_BASE >> PAGE_SHIFT); + if (is_error_page(page)) { + ret = -EFAULT; + goto out; + } + + /* + * Do not pin the page in memory, so that memory hot-unplug + * is able to migrate it. + */ + put_page(page); + kvm->arch.apic_access_memslot_enabled = true; +out: + mutex_unlock(&kvm->slots_lock); + return ret; +} +EXPORT_SYMBOL_GPL(kvm_alloc_apic_access_page); + void kvm_lapic_reset(struct kvm_vcpu *vcpu, bool init_event) { struct kvm_lapic *apic = vcpu->arch.apic; |