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Mon, 13 Jun 2016 22:07:07 +0000 From: Suravee Suthikulpanit To: , , , CC: , , , Suravee Suthikulpanit Subject: [PART2 RFC v2 08/10] svm: Introduce AMD IOMMU avic_ga_log_notifier Date: Mon, 13 Jun 2016 17:06:48 -0500 Message-ID: <1465855611-10092-9-git-send-email-suravee.suthikulpanit@amd.com> X-Mailer: git-send-email 1.9.1 In-Reply-To: <1465855611-10092-1-git-send-email-suravee.suthikulpanit@amd.com> References: <1465855611-10092-1-git-send-email-suravee.suthikulpanit@amd.com> MIME-Version: 1.0 X-Originating-IP: [165.204.77.1] X-ClientProxiedBy: SN1PR0701CA0005.namprd07.prod.outlook.com (10.162.96.15) To BLUPR12MB0434.namprd12.prod.outlook.com (10.162.92.14) X-MS-Office365-Filtering-Correlation-Id: 14d358a0-3983-4df8-bc1a-08d393d70f79 X-Microsoft-Exchange-Diagnostics: 1; BLUPR12MB0434; 2:08YrVbLHqq2BDTVCYJPOxYd/sNmbE0nWVe9Ph74/xVVmTvA7q4KpOar4YZhVt7wzKJ1yKIth7mUn8dsTbYaOxPXz0JMEX2OLtt72/AbJWdp7XZfhR9chA9QuCvDP44QOC0rfzJi/yiajCP0JXQShZp2V/SajYNLMB0iXbeXC8a4862ga+2hkSUwiKoPpcygi; 3:GPUv2Ql7nF+n+OSUWDPbK2httZ4HRs1N32TPhvV/nFBxcPf/h2KrrGM0OeDk3OCQZEAoLQwi3UjBfE/1UIi2udsVUPcwv+eZCiQPnqzFBlBvAisJIDnJYwXtyARXGNgE X-Microsoft-Antispam: UriScan:;BCL:0;PCL:0;RULEID:;SRVR:BLUPR12MB0434; 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Signed-off-by: Suravee Suthikulpanit --- arch/x86/include/asm/kvm_host.h | 2 ++ arch/x86/kvm/svm.c | 58 ++++++++++++++++++++++++++++++++++++++++- 2 files changed, 59 insertions(+), 1 deletion(-) diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h index e0fbe7e..a714cc2 100644 --- a/arch/x86/include/asm/kvm_host.h +++ b/arch/x86/include/asm/kvm_host.h @@ -775,9 +775,11 @@ struct kvm_arch { bool disabled_lapic_found; /* Struct members for AVIC */ + u32 avic_tag; u32 ldr_mode; struct page *avic_logical_id_table_page; struct page *avic_physical_id_table_page; + struct hlist_node hnode; }; struct kvm_vm_stat { diff --git a/arch/x86/kvm/svm.c b/arch/x86/kvm/svm.c index 04707b7..a0aaaa6 100644 --- a/arch/x86/kvm/svm.c +++ b/arch/x86/kvm/svm.c @@ -34,6 +34,8 @@ #include #include #include +#include +#include #include #include @@ -926,6 +928,45 @@ static void svm_disable_lbrv(struct vcpu_svm *svm) set_msr_interception(msrpm, MSR_IA32_LASTINTTOIP, 0, 0); } +#define SVM_VM_DATA_HASH_BITS 8 +DECLARE_HASHTABLE(svm_vm_data_hash, SVM_VM_DATA_HASH_BITS); +static spinlock_t svm_vm_data_hash_lock; + +static int avic_ga_log_notifier(int avic_tag, int vcpu_id, int vec) +{ + unsigned long flags; + struct kvm_arch *ka = NULL; + struct kvm_vcpu *vcpu = NULL; + struct vcpu_svm *svm = NULL; + + pr_debug("SVM: %s: avic_tag=%#x, vcpu_id=%#x, vec=%#x\n", + __func__, avic_tag, vcpu_id, vec); + + spin_lock_irqsave(&svm_vm_data_hash_lock, flags); + hash_for_each_possible(svm_vm_data_hash, ka, hnode, avic_tag) { + struct kvm *kvm = container_of(ka, struct kvm, arch); + + vcpu = kvm_get_vcpu_by_id(kvm, vcpu_id); + break; + } + spin_unlock_irqrestore(&svm_vm_data_hash_lock, flags); + + if (!vcpu) + return 0; + + svm = to_svm(vcpu); + + /* Note: + * At this point, the IOMMU should have already set the pending + * bit in the vAPIC backing page. So, we just need to schedule + * in the vcpu. + */ + if (vcpu->mode == OUTSIDE_GUEST_MODE) + kvm_vcpu_wake_up(vcpu); + + return 0; +} + static __init int svm_hardware_setup(void) { int cpu; @@ -984,9 +1025,14 @@ static __init int svm_hardware_setup(void) if (avic && (!npt_enabled || !boot_cpu_has(X86_FEATURE_AVIC))) avic = false; - if (avic) + if (avic) { pr_info("AVIC enabled\n"); + hash_init(svm_vm_data_hash); + spin_lock_init(&svm_vm_data_hash_lock); + amd_iommu_register_ga_log_notifier(&avic_ga_log_notifier); + } + return 0; err: @@ -1277,16 +1323,22 @@ static int avic_init_backing_page(struct kvm_vcpu *vcpu) static void avic_vm_destroy(struct kvm *kvm) { + unsigned long flags; struct kvm_arch *vm_data = &kvm->arch; if (vm_data->avic_logical_id_table_page) __free_page(vm_data->avic_logical_id_table_page); if (vm_data->avic_physical_id_table_page) __free_page(vm_data->avic_physical_id_table_page); + + spin_lock_irqsave(&svm_vm_data_hash_lock, flags); + hash_del(&vm_data->hnode); + spin_unlock_irqrestore(&svm_vm_data_hash_lock, flags); } static int avic_vm_init(struct kvm *kvm) { + unsigned long flags; int err = -ENOMEM; struct kvm_arch *vm_data = &kvm->arch; struct page *p_page; @@ -1311,6 +1363,10 @@ static int avic_vm_init(struct kvm *kvm) vm_data->avic_logical_id_table_page = l_page; clear_page(page_address(l_page)); + spin_lock_irqsave(&svm_vm_data_hash_lock, flags); + hash_add(svm_vm_data_hash, &vm_data->hnode, vm_data->avic_tag); + spin_unlock_irqrestore(&svm_vm_data_hash_lock, flags); + return 0; free_avic: