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https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
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KVM: x86: Detect and Initialize AVIC support
This patch introduces AVIC-related data structure, and AVIC
initialization code.
There are three main data structures for AVIC:
* Virtual APIC (vAPIC) backing page (per-VCPU)
* Physical APIC ID table (per-VM)
* Logical APIC ID table (per-VM)
Currently, AVIC is disabled by default. Users can manually
enable AVIC via kernel boot option kvm-amd.avic=1 or during
kvm-amd module loading with parameter avic=1.
Signed-off-by: Suravee Suthikulpanit <suravee.suthikulpanit@amd.com>
[Avoid extra indentation (Boris). - Paolo]
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Suravee Suthikulpanit
Paolo Bonzini
parent
3d5615e534
commit
44a95dae1d
3 changed files with 231 additions and 1 deletions
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@ -773,6 +773,10 @@ struct kvm_arch {
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u8 nr_reserved_ioapic_pins;
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bool disabled_lapic_found;
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/* Struct members for AVIC */
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struct page *avic_logical_id_table_page;
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struct page *avic_physical_id_table_page;
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};
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struct kvm_vm_stat {
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@ -116,6 +116,9 @@ struct __attribute__ ((__packed__)) vmcb_control_area {
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#define V_INTR_MASKING_SHIFT 24
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#define V_INTR_MASKING_MASK (1 << V_INTR_MASKING_SHIFT)
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#define AVIC_ENABLE_SHIFT 31
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#define AVIC_ENABLE_MASK (1 << AVIC_ENABLE_SHIFT)
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#define SVM_INTERRUPT_SHADOW_MASK 1
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#define SVM_IOIO_STR_SHIFT 2
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@ -14,6 +14,9 @@
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* the COPYING file in the top-level directory.
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*
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*/
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#define pr_fmt(fmt) "SVM: " fmt
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#include <linux/kvm_host.h>
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#include "irq.h"
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@ -78,6 +81,14 @@ MODULE_DEVICE_TABLE(x86cpu, svm_cpu_id);
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#define TSC_RATIO_MIN 0x0000000000000001ULL
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#define TSC_RATIO_MAX 0x000000ffffffffffULL
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#define AVIC_HPA_MASK ~((0xFFFULL << 52) || 0xFFF)
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/*
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* 0xff is broadcast, so the max index allowed for physical APIC ID
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* table is 0xfe. APIC IDs above 0xff are reserved.
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*/
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#define AVIC_MAX_PHYSICAL_ID_COUNT 255
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static bool erratum_383_found __read_mostly;
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static const u32 host_save_user_msrs[] = {
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@ -162,8 +173,19 @@ struct vcpu_svm {
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/* cached guest cpuid flags for faster access */
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bool nrips_enabled : 1;
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struct page *avic_backing_page;
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u64 *avic_physical_id_cache;
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};
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#define AVIC_LOGICAL_ID_ENTRY_GUEST_PHYSICAL_ID_MASK (0xFF)
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#define AVIC_LOGICAL_ID_ENTRY_VALID_MASK (1 << 31)
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#define AVIC_PHYSICAL_ID_ENTRY_HOST_PHYSICAL_ID_MASK (0xFFULL)
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#define AVIC_PHYSICAL_ID_ENTRY_BACKING_PAGE_MASK (0xFFFFFFFFFFULL << 12)
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#define AVIC_PHYSICAL_ID_ENTRY_IS_RUNNING_MASK (1ULL << 62)
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#define AVIC_PHYSICAL_ID_ENTRY_VALID_MASK (1ULL << 63)
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static DEFINE_PER_CPU(u64, current_tsc_ratio);
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#define TSC_RATIO_DEFAULT 0x0100000000ULL
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@ -205,6 +227,10 @@ module_param(npt, int, S_IRUGO);
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static int nested = true;
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module_param(nested, int, S_IRUGO);
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/* enable / disable AVIC */
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static int avic;
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module_param(avic, int, S_IRUGO);
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static void svm_set_cr0(struct kvm_vcpu *vcpu, unsigned long cr0);
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static void svm_flush_tlb(struct kvm_vcpu *vcpu);
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static void svm_complete_interrupts(struct vcpu_svm *svm);
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@ -228,12 +254,18 @@ enum {
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VMCB_SEG, /* CS, DS, SS, ES, CPL */
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VMCB_CR2, /* CR2 only */
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VMCB_LBR, /* DBGCTL, BR_FROM, BR_TO, LAST_EX_FROM, LAST_EX_TO */
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VMCB_AVIC, /* AVIC APIC_BAR, AVIC APIC_BACKING_PAGE,
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* AVIC PHYSICAL_TABLE pointer,
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* AVIC LOGICAL_TABLE pointer
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*/
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VMCB_DIRTY_MAX,
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};
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/* TPR and CR2 are always written before VMRUN */
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#define VMCB_ALWAYS_DIRTY_MASK ((1U << VMCB_INTR) | (1U << VMCB_CR2))
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#define VMCB_AVIC_APIC_BAR_MASK 0xFFFFFFFFFF000ULL
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static inline void mark_all_dirty(struct vmcb *vmcb)
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{
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vmcb->control.clean = 0;
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@ -255,6 +287,12 @@ static inline struct vcpu_svm *to_svm(struct kvm_vcpu *vcpu)
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return container_of(vcpu, struct vcpu_svm, vcpu);
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}
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static inline void avic_update_vapic_bar(struct vcpu_svm *svm, u64 data)
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{
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svm->vmcb->control.avic_vapic_bar = data & VMCB_AVIC_APIC_BAR_MASK;
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mark_dirty(svm->vmcb, VMCB_AVIC);
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}
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static void recalc_intercepts(struct vcpu_svm *svm)
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{
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struct vmcb_control_area *c, *h;
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@ -923,6 +961,12 @@ static __init int svm_hardware_setup(void)
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} else
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kvm_disable_tdp();
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if (avic && (!npt_enabled || !boot_cpu_has(X86_FEATURE_AVIC)))
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avic = false;
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if (avic)
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pr_info("AVIC enabled\n");
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return 0;
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err:
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@ -1000,6 +1044,22 @@ static void svm_adjust_tsc_offset_guest(struct kvm_vcpu *vcpu, s64 adjustment)
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mark_dirty(svm->vmcb, VMCB_INTERCEPTS);
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}
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static void avic_init_vmcb(struct vcpu_svm *svm)
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{
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struct vmcb *vmcb = svm->vmcb;
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struct kvm_arch *vm_data = &svm->vcpu.kvm->arch;
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phys_addr_t bpa = page_to_phys(svm->avic_backing_page);
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phys_addr_t lpa = page_to_phys(vm_data->avic_logical_id_table_page);
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phys_addr_t ppa = page_to_phys(vm_data->avic_physical_id_table_page);
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vmcb->control.avic_backing_page = bpa & AVIC_HPA_MASK;
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vmcb->control.avic_logical_id = lpa & AVIC_HPA_MASK;
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vmcb->control.avic_physical_id = ppa & AVIC_HPA_MASK;
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vmcb->control.avic_physical_id |= AVIC_MAX_PHYSICAL_ID_COUNT;
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vmcb->control.int_ctl |= AVIC_ENABLE_MASK;
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svm->vcpu.arch.apicv_active = true;
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}
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static void init_vmcb(struct vcpu_svm *svm)
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{
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struct vmcb_control_area *control = &svm->vmcb->control;
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@ -1110,9 +1170,131 @@ static void init_vmcb(struct vcpu_svm *svm)
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set_intercept(svm, INTERCEPT_PAUSE);
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}
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if (avic)
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avic_init_vmcb(svm);
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mark_all_dirty(svm->vmcb);
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enable_gif(svm);
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}
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static u64 *avic_get_physical_id_entry(struct kvm_vcpu *vcpu, int index)
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{
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u64 *avic_physical_id_table;
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struct kvm_arch *vm_data = &vcpu->kvm->arch;
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if (index >= AVIC_MAX_PHYSICAL_ID_COUNT)
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return NULL;
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avic_physical_id_table = page_address(vm_data->avic_physical_id_table_page);
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return &avic_physical_id_table[index];
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}
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/**
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* Note:
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* AVIC hardware walks the nested page table to check permissions,
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* but does not use the SPA address specified in the leaf page
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* table entry since it uses address in the AVIC_BACKING_PAGE pointer
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* field of the VMCB. Therefore, we set up the
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* APIC_ACCESS_PAGE_PRIVATE_MEMSLOT (4KB) here.
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*/
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static int avic_init_access_page(struct kvm_vcpu *vcpu)
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{
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struct kvm *kvm = vcpu->kvm;
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int ret;
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if (kvm->arch.apic_access_page_done)
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return 0;
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ret = x86_set_memory_region(kvm,
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APIC_ACCESS_PAGE_PRIVATE_MEMSLOT,
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APIC_DEFAULT_PHYS_BASE,
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PAGE_SIZE);
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if (ret)
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return ret;
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kvm->arch.apic_access_page_done = true;
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return 0;
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}
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static int avic_init_backing_page(struct kvm_vcpu *vcpu)
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{
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int ret;
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u64 *entry, new_entry;
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int id = vcpu->vcpu_id;
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struct vcpu_svm *svm = to_svm(vcpu);
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ret = avic_init_access_page(vcpu);
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if (ret)
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return ret;
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if (id >= AVIC_MAX_PHYSICAL_ID_COUNT)
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return -EINVAL;
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if (!svm->vcpu.arch.apic->regs)
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return -EINVAL;
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svm->avic_backing_page = virt_to_page(svm->vcpu.arch.apic->regs);
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/* Setting AVIC backing page address in the phy APIC ID table */
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entry = avic_get_physical_id_entry(vcpu, id);
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if (!entry)
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return -EINVAL;
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new_entry = READ_ONCE(*entry);
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new_entry = (page_to_phys(svm->avic_backing_page) &
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AVIC_PHYSICAL_ID_ENTRY_BACKING_PAGE_MASK) |
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AVIC_PHYSICAL_ID_ENTRY_VALID_MASK;
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WRITE_ONCE(*entry, new_entry);
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svm->avic_physical_id_cache = entry;
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return 0;
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}
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static void avic_vm_destroy(struct kvm *kvm)
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{
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struct kvm_arch *vm_data = &kvm->arch;
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if (vm_data->avic_logical_id_table_page)
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__free_page(vm_data->avic_logical_id_table_page);
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if (vm_data->avic_physical_id_table_page)
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__free_page(vm_data->avic_physical_id_table_page);
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}
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static int avic_vm_init(struct kvm *kvm)
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{
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int err = -ENOMEM;
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struct kvm_arch *vm_data = &kvm->arch;
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struct page *p_page;
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struct page *l_page;
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if (!avic)
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return 0;
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/* Allocating physical APIC ID table (4KB) */
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p_page = alloc_page(GFP_KERNEL);
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if (!p_page)
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goto free_avic;
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vm_data->avic_physical_id_table_page = p_page;
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clear_page(page_address(p_page));
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/* Allocating logical APIC ID table (4KB) */
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l_page = alloc_page(GFP_KERNEL);
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if (!l_page)
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goto free_avic;
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vm_data->avic_logical_id_table_page = l_page;
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clear_page(page_address(l_page));
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return 0;
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free_avic:
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avic_vm_destroy(kvm);
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return err;
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}
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static void svm_vcpu_reset(struct kvm_vcpu *vcpu, bool init_event)
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@ -1131,6 +1313,9 @@ static void svm_vcpu_reset(struct kvm_vcpu *vcpu, bool init_event)
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kvm_cpuid(vcpu, &eax, &dummy, &dummy, &dummy);
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kvm_register_write(vcpu, VCPU_REGS_RDX, eax);
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if (kvm_vcpu_apicv_active(vcpu) && !init_event)
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avic_update_vapic_bar(svm, APIC_DEFAULT_PHYS_BASE);
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}
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static struct kvm_vcpu *svm_create_vcpu(struct kvm *kvm, unsigned int id)
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@ -1169,6 +1354,12 @@ static struct kvm_vcpu *svm_create_vcpu(struct kvm *kvm, unsigned int id)
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if (!hsave_page)
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goto free_page3;
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if (avic) {
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err = avic_init_backing_page(&svm->vcpu);
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if (err)
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goto free_page4;
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}
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svm->nested.hsave = page_address(hsave_page);
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svm->msrpm = page_address(msrpm_pages);
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@ -1187,6 +1378,8 @@ static struct kvm_vcpu *svm_create_vcpu(struct kvm *kvm, unsigned int id)
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return &svm->vcpu;
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free_page4:
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__free_page(hsave_page);
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free_page3:
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__free_pages(nested_msrpm_pages, MSRPM_ALLOC_ORDER);
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free_page2:
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@ -3212,6 +3405,10 @@ static int svm_set_msr(struct kvm_vcpu *vcpu, struct msr_data *msr)
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case MSR_VM_IGNNE:
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vcpu_unimpl(vcpu, "unimplemented wrmsr: 0x%x data 0x%llx\n", ecx, data);
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break;
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case MSR_IA32_APICBASE:
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if (kvm_vcpu_apicv_active(vcpu))
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avic_update_vapic_bar(to_svm(vcpu), data);
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/* Follow through */
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default:
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return kvm_set_msr_common(vcpu, msr);
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}
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@ -3375,10 +3572,14 @@ static void dump_vmcb(struct kvm_vcpu *vcpu)
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pr_err("%-20s%08x\n", "exit_int_info_err:", control->exit_int_info_err);
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pr_err("%-20s%lld\n", "nested_ctl:", control->nested_ctl);
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pr_err("%-20s%016llx\n", "nested_cr3:", control->nested_cr3);
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pr_err("%-20s%016llx\n", "avic_vapic_bar:", control->avic_vapic_bar);
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pr_err("%-20s%08x\n", "event_inj:", control->event_inj);
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pr_err("%-20s%08x\n", "event_inj_err:", control->event_inj_err);
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pr_err("%-20s%lld\n", "lbr_ctl:", control->lbr_ctl);
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pr_err("%-20s%016llx\n", "next_rip:", control->next_rip);
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pr_err("%-20s%016llx\n", "avic_backing_page:", control->avic_backing_page);
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pr_err("%-20s%016llx\n", "avic_logical_id:", control->avic_logical_id);
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pr_err("%-20s%016llx\n", "avic_physical_id:", control->avic_physical_id);
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pr_err("VMCB State Save Area:\n");
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pr_err("%-5s s: %04x a: %04x l: %08x b: %016llx\n",
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"es:",
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@ -3606,11 +3807,28 @@ static void svm_set_virtual_x2apic_mode(struct kvm_vcpu *vcpu, bool set)
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static bool svm_get_enable_apicv(void)
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{
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return false;
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return avic;
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}
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static void svm_hwapic_irr_update(struct kvm_vcpu *vcpu, int max_irr)
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{
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}
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static void svm_hwapic_isr_update(struct kvm *kvm, int isr)
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{
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}
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/* Note: Currently only used by Hyper-V. */
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static void svm_refresh_apicv_exec_ctrl(struct kvm_vcpu *vcpu)
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{
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struct vcpu_svm *svm = to_svm(vcpu);
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struct vmcb *vmcb = svm->vmcb;
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if (!avic)
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return;
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vmcb->control.int_ctl &= ~AVIC_ENABLE_MASK;
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mark_dirty(vmcb, VMCB_INTR);
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}
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static void svm_load_eoi_exitmap(struct kvm_vcpu *vcpu, u64 *eoi_exit_bitmap)
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@ -4322,6 +4540,9 @@ static struct kvm_x86_ops svm_x86_ops = {
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.vcpu_free = svm_free_vcpu,
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.vcpu_reset = svm_vcpu_reset,
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.vm_init = avic_vm_init,
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.vm_destroy = avic_vm_destroy,
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.prepare_guest_switch = svm_prepare_guest_switch,
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.vcpu_load = svm_vcpu_load,
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.vcpu_put = svm_vcpu_put,
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@ -4382,6 +4603,8 @@ static struct kvm_x86_ops svm_x86_ops = {
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.refresh_apicv_exec_ctrl = svm_refresh_apicv_exec_ctrl,
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.load_eoi_exitmap = svm_load_eoi_exitmap,
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.sync_pir_to_irr = svm_sync_pir_to_irr,
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.hwapic_irr_update = svm_hwapic_irr_update,
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.hwapic_isr_update = svm_hwapic_isr_update,
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.set_tss_addr = svm_set_tss_addr,
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.get_tdp_level = get_npt_level,
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