Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753094AbaGBJAG (ORCPT ); Wed, 2 Jul 2014 05:00:06 -0400 Received: from cn.fujitsu.com ([59.151.112.132]:48510 "EHLO heian.cn.fujitsu.com" rhost-flags-OK-FAIL-OK-FAIL) by vger.kernel.org with ESMTP id S1752916AbaGBJAA (ORCPT ); Wed, 2 Jul 2014 05:00:00 -0400 X-IronPort-AV: E=Sophos;i="5.00,818,1396972800"; d="scan'208";a="32730472" From: Tang Chen To: , CC: , , , , , Subject: [PATCH 4/4] kvm, mem-hotplug: Update apic access page when it is migrated. Date: Wed, 2 Jul 2014 17:00:37 +0800 Message-ID: <1404291637-15048-5-git-send-email-tangchen@cn.fujitsu.com> X-Mailer: git-send-email 1.7.11.7 In-Reply-To: <1404291637-15048-1-git-send-email-tangchen@cn.fujitsu.com> References: <1404291637-15048-1-git-send-email-tangchen@cn.fujitsu.com> MIME-Version: 1.0 Content-Type: text/plain X-Originating-IP: [10.167.226.99] Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org apic access page is pinned in memory, and as a result it cannot be migrated/hot-removed. Actually it doesn't need to be pinned in memory. This patch introduces a new vcpu request: KVM_REQ_MIGRATE_EPT. This requet will be made when kvm_mmu_notifier_invalidate_page() is called when the page is unmapped from the qemu user space to reset APIC_ACCESS_ADDR pointer in each online vcpu to 0. And will also be made when ept violation happens to reset APIC_ACCESS_ADDR to the new page phys_addr (host phys_addr). --- arch/x86/include/asm/kvm_host.h | 2 ++ arch/x86/kvm/mmu.c | 15 +++++++++++++++ arch/x86/kvm/vmx.c | 9 ++++++++- arch/x86/kvm/x86.c | 20 ++++++++++++++++++++ include/linux/kvm_host.h | 1 + virt/kvm/kvm_main.c | 15 +++++++++++++++ 6 files changed, 61 insertions(+), 1 deletion(-) diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h index 8771c0f..f104b87 100644 --- a/arch/x86/include/asm/kvm_host.h +++ b/arch/x86/include/asm/kvm_host.h @@ -575,6 +575,7 @@ struct kvm_arch { unsigned int tss_addr; struct page *apic_access_page; + bool apic_access_page_migrated; gpa_t wall_clock; @@ -739,6 +740,7 @@ struct kvm_x86_ops { void (*hwapic_isr_update)(struct kvm *kvm, int isr); void (*load_eoi_exitmap)(struct kvm_vcpu *vcpu, u64 *eoi_exit_bitmap); void (*set_virtual_x2apic_mode)(struct kvm_vcpu *vcpu, bool set); + void (*set_apic_access_page_addr)(struct kvm *kvm, hpa_t hpa); void (*deliver_posted_interrupt)(struct kvm_vcpu *vcpu, int vector); void (*sync_pir_to_irr)(struct kvm_vcpu *vcpu); int (*set_tss_addr)(struct kvm *kvm, unsigned int addr); diff --git a/arch/x86/kvm/mmu.c b/arch/x86/kvm/mmu.c index c0d72f6..a655444 100644 --- a/arch/x86/kvm/mmu.c +++ b/arch/x86/kvm/mmu.c @@ -3436,6 +3436,21 @@ static int tdp_page_fault(struct kvm_vcpu *vcpu, gva_t gpa, u32 error_code, kvm_make_request(KVM_REQ_MIGRATE_EPT, vcpu); } + if (gpa == VMX_APIC_ACCESS_PAGE_ADDR && + vcpu->kvm->arch.apic_access_page_migrated) { + int i; + + vcpu->kvm->arch.apic_access_page_migrated = false; + + /* + * We need update APIC_ACCESS_ADDR pointer in each VMCS of + * all the online vcpus. + */ + for (i = 0; i < atomic_read(&vcpu->kvm->online_vcpus); i++) + kvm_make_request(KVM_REQ_MIGRATE_APIC, + vcpu->kvm->vcpus[i]); + } + spin_unlock(&vcpu->kvm->mmu_lock); return r; diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c index c336cb3..abc152f 100644 --- a/arch/x86/kvm/vmx.c +++ b/arch/x86/kvm/vmx.c @@ -3988,7 +3988,7 @@ static int alloc_apic_access_page(struct kvm *kvm) if (r) goto out; - page = gfn_to_page(kvm, VMX_APIC_ACCESS_PAGE_ADDR >> PAGE_SHIFT); + page = gfn_to_page_no_pin(kvm, VMX_APIC_ACCESS_PAGE_ADDR >> PAGE_SHIFT); if (is_error_page(page)) { r = -EFAULT; goto out; @@ -7075,6 +7075,12 @@ static void vmx_set_virtual_x2apic_mode(struct kvm_vcpu *vcpu, bool set) vmx_set_msr_bitmap(vcpu); } +static void vmx_set_apic_access_page_addr(struct kvm *kvm, hpa_t hpa) +{ + if (vm_need_virtualize_apic_accesses(kvm)) + vmcs_write64(APIC_ACCESS_ADDR, hpa); +} + static void vmx_hwapic_isr_update(struct kvm *kvm, int isr) { u16 status; @@ -8846,6 +8852,7 @@ static struct kvm_x86_ops vmx_x86_ops = { .enable_irq_window = enable_irq_window, .update_cr8_intercept = update_cr8_intercept, .set_virtual_x2apic_mode = vmx_set_virtual_x2apic_mode, + .set_apic_access_page_addr = vmx_set_apic_access_page_addr, .vm_has_apicv = vmx_vm_has_apicv, .load_eoi_exitmap = vmx_load_eoi_exitmap, .hwapic_irr_update = vmx_hwapic_irr_update, diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c index a26524f..14e7174 100644 --- a/arch/x86/kvm/x86.c +++ b/arch/x86/kvm/x86.c @@ -5943,6 +5943,24 @@ static void vcpu_migrated_page_update_ept(struct kvm_vcpu *vcpu) } } +static void vcpu_migrated_page_update_apic(struct kvm_vcpu *vcpu) +{ + struct kvm *kvm = vcpu->kvm; + + if (kvm->arch.apic_access_page_migrated) { + if (kvm->arch.apic_access_page) + kvm->arch.apic_access_page = pfn_to_page(0); + kvm_x86_ops->set_apic_access_page_addr(kvm, 0x0ull); + } else { + struct page *page; + page = gfn_to_page_no_pin(kvm, + VMX_APIC_ACCESS_PAGE_ADDR >> PAGE_SHIFT); + kvm->arch.apic_access_page = page; + kvm_x86_ops->set_apic_access_page_addr(kvm, + page_to_phys(page)); + } +} + /* * Returns 1 to let __vcpu_run() continue the guest execution loop without * exiting to the userspace. Otherwise, the value will be returned to the @@ -6005,6 +6023,8 @@ static int vcpu_enter_guest(struct kvm_vcpu *vcpu) vcpu_scan_ioapic(vcpu); if (kvm_check_request(KVM_REQ_MIGRATE_EPT, vcpu)) vcpu_migrated_page_update_ept(vcpu); + if (kvm_check_request(KVM_REQ_MIGRATE_APIC, vcpu)) + vcpu_migrated_page_update_apic(vcpu); } if (kvm_check_request(KVM_REQ_EVENT, vcpu) || req_int_win) { diff --git a/include/linux/kvm_host.h b/include/linux/kvm_host.h index 4b7e51a..e2ad65e 100644 --- a/include/linux/kvm_host.h +++ b/include/linux/kvm_host.h @@ -137,6 +137,7 @@ static inline bool is_error_page(struct page *page) #define KVM_REQ_ENABLE_IBS 23 #define KVM_REQ_DISABLE_IBS 24 #define KVM_REQ_MIGRATE_EPT 25 +#define KVM_REQ_MIGRATE_APIC 26 #define KVM_USERSPACE_IRQ_SOURCE_ID 0 #define KVM_IRQFD_RESAMPLE_IRQ_SOURCE_ID 1 diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c index d271e89..f06438c 100644 --- a/virt/kvm/kvm_main.c +++ b/virt/kvm/kvm_main.c @@ -54,6 +54,7 @@ #include #include #include +#include #include "coalesced_mmio.h" #include "async_pf.h" @@ -300,6 +301,20 @@ static void kvm_mmu_notifier_invalidate_page(struct mmu_notifier *mn, kvm_make_request(KVM_REQ_MIGRATE_EPT, kvm->vcpus[0]); } + if (address == + gfn_to_hva(kvm, VMX_APIC_ACCESS_PAGE_ADDR >> PAGE_SHIFT)) { + int i; + + kvm->arch.apic_access_page_migrated = true; + + /* + * We need update APIC_ACCESS_ADDR pointer in each VMCS of + * all the online vcpus. + */ + for (i = 0; i < atomic_read(&kvm->online_vcpus); i++) + kvm_make_request(KVM_REQ_MIGRATE_APIC, kvm->vcpus[i]); + } + spin_unlock(&kvm->mmu_lock); srcu_read_unlock(&kvm->srcu, idx); } -- 1.8.3.1 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/