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Diffstat (limited to '')
| -rw-r--r-- | arch/x86/kvm/hyperv.c | 1683 |
1 files changed, 1683 insertions, 0 deletions
diff --git a/arch/x86/kvm/hyperv.c b/arch/x86/kvm/hyperv.c new file mode 100644 index 000000000..ca5a6c3f8 --- /dev/null +++ b/arch/x86/kvm/hyperv.c @@ -0,0 +1,1683 @@ +/* + * KVM Microsoft Hyper-V emulation + * + * derived from arch/x86/kvm/x86.c + * + * Copyright (C) 2006 Qumranet, Inc. + * Copyright (C) 2008 Qumranet, Inc. + * Copyright IBM Corporation, 2008 + * Copyright 2010 Red Hat, Inc. and/or its affiliates. + * Copyright (C) 2015 Andrey Smetanin <asmetanin@virtuozzo.com> + * + * Authors: + * Avi Kivity <avi@qumranet.com> + * Yaniv Kamay <yaniv@qumranet.com> + * Amit Shah <amit.shah@qumranet.com> + * Ben-Ami Yassour <benami@il.ibm.com> + * Andrey Smetanin <asmetanin@virtuozzo.com> + * + * This work is licensed under the terms of the GNU GPL, version 2. See + * the COPYING file in the top-level directory. + * + */ + +#include "x86.h" +#include "lapic.h" +#include "ioapic.h" +#include "hyperv.h" + +#include <linux/kvm_host.h> +#include <linux/highmem.h> +#include <linux/sched/cputime.h> +#include <linux/eventfd.h> + +#include <asm/apicdef.h> +#include <trace/events/kvm.h> + +#include "trace.h" + +static inline u64 synic_read_sint(struct kvm_vcpu_hv_synic *synic, int sint) +{ + return atomic64_read(&synic->sint[sint]); +} + +static inline int synic_get_sint_vector(u64 sint_value) +{ + if (sint_value & HV_SYNIC_SINT_MASKED) + return -1; + return sint_value & HV_SYNIC_SINT_VECTOR_MASK; +} + +static bool synic_has_vector_connected(struct kvm_vcpu_hv_synic *synic, + int vector) +{ + int i; + + for (i = 0; i < ARRAY_SIZE(synic->sint); i++) { + if (synic_get_sint_vector(synic_read_sint(synic, i)) == vector) + return true; + } + return false; +} + +static bool synic_has_vector_auto_eoi(struct kvm_vcpu_hv_synic *synic, + int vector) +{ + int i; + u64 sint_value; + + for (i = 0; i < ARRAY_SIZE(synic->sint); i++) { + sint_value = synic_read_sint(synic, i); + if (synic_get_sint_vector(sint_value) == vector && + sint_value & HV_SYNIC_SINT_AUTO_EOI) + return true; + } + return false; +} + +static void synic_update_vector(struct kvm_vcpu_hv_synic *synic, + int vector) +{ + if (vector < HV_SYNIC_FIRST_VALID_VECTOR) + return; + + if (synic_has_vector_connected(synic, vector)) + __set_bit(vector, synic->vec_bitmap); + else + __clear_bit(vector, synic->vec_bitmap); + + if (synic_has_vector_auto_eoi(synic, vector)) + __set_bit(vector, synic->auto_eoi_bitmap); + else + __clear_bit(vector, synic->auto_eoi_bitmap); +} + +static int synic_set_sint(struct kvm_vcpu_hv_synic *synic, int sint, + u64 data, bool host) +{ + int vector, old_vector; + bool masked; + + vector = data & HV_SYNIC_SINT_VECTOR_MASK; + masked = data & HV_SYNIC_SINT_MASKED; + + /* + * Valid vectors are 16-255, however, nested Hyper-V attempts to write + * default '0x10000' value on boot and this should not #GP. We need to + * allow zero-initing the register from host as well. + */ + if (vector < HV_SYNIC_FIRST_VALID_VECTOR && !host && !masked) + return 1; + /* + * Guest may configure multiple SINTs to use the same vector, so + * we maintain a bitmap of vectors handled by synic, and a + * bitmap of vectors with auto-eoi behavior. The bitmaps are + * updated here, and atomically queried on fast paths. + */ + old_vector = synic_read_sint(synic, sint) & HV_SYNIC_SINT_VECTOR_MASK; + + atomic64_set(&synic->sint[sint], data); + + synic_update_vector(synic, old_vector); + + synic_update_vector(synic, vector); + + /* Load SynIC vectors into EOI exit bitmap */ + kvm_make_request(KVM_REQ_SCAN_IOAPIC, synic_to_vcpu(synic)); + return 0; +} + +static struct kvm_vcpu *get_vcpu_by_vpidx(struct kvm *kvm, u32 vpidx) +{ + struct kvm_vcpu *vcpu = NULL; + int i; + + if (vpidx >= KVM_MAX_VCPUS) + return NULL; + + vcpu = kvm_get_vcpu(kvm, vpidx); + if (vcpu && vcpu_to_hv_vcpu(vcpu)->vp_index == vpidx) + return vcpu; + kvm_for_each_vcpu(i, vcpu, kvm) + if (vcpu_to_hv_vcpu(vcpu)->vp_index == vpidx) + return vcpu; + return NULL; +} + +static struct kvm_vcpu_hv_synic *synic_get(struct kvm *kvm, u32 vpidx) +{ + struct kvm_vcpu *vcpu; + struct kvm_vcpu_hv_synic *synic; + + vcpu = get_vcpu_by_vpidx(kvm, vpidx); + if (!vcpu) + return NULL; + synic = vcpu_to_synic(vcpu); + return (synic->active) ? synic : NULL; +} + +static void synic_clear_sint_msg_pending(struct kvm_vcpu_hv_synic *synic, + u32 sint) +{ + struct kvm_vcpu *vcpu = synic_to_vcpu(synic); + struct page *page; + gpa_t gpa; + struct hv_message *msg; + struct hv_message_page *msg_page; + + gpa = synic->msg_page & PAGE_MASK; + page = kvm_vcpu_gfn_to_page(vcpu, gpa >> PAGE_SHIFT); + if (is_error_page(page)) { + vcpu_err(vcpu, "Hyper-V SynIC can't get msg page, gpa 0x%llx\n", + gpa); + return; + } + msg_page = kmap_atomic(page); + + msg = &msg_page->sint_message[sint]; + msg->header.message_flags.msg_pending = 0; + + kunmap_atomic(msg_page); + kvm_release_page_dirty(page); + kvm_vcpu_mark_page_dirty(vcpu, gpa >> PAGE_SHIFT); +} + +static void kvm_hv_notify_acked_sint(struct kvm_vcpu *vcpu, u32 sint) +{ + struct kvm *kvm = vcpu->kvm; + struct kvm_vcpu_hv_synic *synic = vcpu_to_synic(vcpu); + struct kvm_vcpu_hv *hv_vcpu = vcpu_to_hv_vcpu(vcpu); + struct kvm_vcpu_hv_stimer *stimer; + int gsi, idx, stimers_pending; + + trace_kvm_hv_notify_acked_sint(vcpu->vcpu_id, sint); + + if (synic->msg_page & HV_SYNIC_SIMP_ENABLE) + synic_clear_sint_msg_pending(synic, sint); + + /* Try to deliver pending Hyper-V SynIC timers messages */ + stimers_pending = 0; + for (idx = 0; idx < ARRAY_SIZE(hv_vcpu->stimer); idx++) { + stimer = &hv_vcpu->stimer[idx]; + if (stimer->msg_pending && + (stimer->config & HV_STIMER_ENABLE) && + HV_STIMER_SINT(stimer->config) == sint) { + set_bit(stimer->index, + hv_vcpu->stimer_pending_bitmap); + stimers_pending++; + } + } + if (stimers_pending) + kvm_make_request(KVM_REQ_HV_STIMER, vcpu); + + idx = srcu_read_lock(&kvm->irq_srcu); + gsi = atomic_read(&synic->sint_to_gsi[sint]); + if (gsi != -1) + kvm_notify_acked_gsi(kvm, gsi); + srcu_read_unlock(&kvm->irq_srcu, idx); +} + +static void synic_exit(struct kvm_vcpu_hv_synic *synic, u32 msr) +{ + struct kvm_vcpu *vcpu = synic_to_vcpu(synic); + struct kvm_vcpu_hv *hv_vcpu = &vcpu->arch.hyperv; + + hv_vcpu->exit.type = KVM_EXIT_HYPERV_SYNIC; + hv_vcpu->exit.u.synic.msr = msr; + hv_vcpu->exit.u.synic.control = synic->control; + hv_vcpu->exit.u.synic.evt_page = synic->evt_page; + hv_vcpu->exit.u.synic.msg_page = synic->msg_page; + + kvm_make_request(KVM_REQ_HV_EXIT, vcpu); +} + +static int synic_set_msr(struct kvm_vcpu_hv_synic *synic, + u32 msr, u64 data, bool host) +{ + struct kvm_vcpu *vcpu = synic_to_vcpu(synic); + int ret; + + if (!synic->active && (!host || data)) + return 1; + + trace_kvm_hv_synic_set_msr(vcpu->vcpu_id, msr, data, host); + + ret = 0; + switch (msr) { + case HV_X64_MSR_SCONTROL: + synic->control = data; + if (!host) + synic_exit(synic, msr); + break; + case HV_X64_MSR_SVERSION: + if (!host) { + ret = 1; + break; + } + synic->version = data; + break; + case HV_X64_MSR_SIEFP: + if ((data & HV_SYNIC_SIEFP_ENABLE) && !host && + !synic->dont_zero_synic_pages) + if (kvm_clear_guest(vcpu->kvm, + data & PAGE_MASK, PAGE_SIZE)) { + ret = 1; + break; + } + synic->evt_page = data; + if (!host) + synic_exit(synic, msr); + break; + case HV_X64_MSR_SIMP: + if ((data & HV_SYNIC_SIMP_ENABLE) && !host && + !synic->dont_zero_synic_pages) + if (kvm_clear_guest(vcpu->kvm, + data & PAGE_MASK, PAGE_SIZE)) { + ret = 1; + break; + } + synic->msg_page = data; + if (!host) + synic_exit(synic, msr); + break; + case HV_X64_MSR_EOM: { + int i; + + if (!synic->active) + break; + + for (i = 0; i < ARRAY_SIZE(synic->sint); i++) + kvm_hv_notify_acked_sint(vcpu, i); + break; + } + case HV_X64_MSR_SINT0 ... HV_X64_MSR_SINT15: + ret = synic_set_sint(synic, msr - HV_X64_MSR_SINT0, data, host); + break; + default: + ret = 1; + break; + } + return ret; +} + +static int synic_get_msr(struct kvm_vcpu_hv_synic *synic, u32 msr, u64 *pdata, + bool host) +{ + int ret; + + if (!synic->active && !host) + return 1; + + ret = 0; + switch (msr) { + case HV_X64_MSR_SCONTROL: + *pdata = synic->control; + break; + case HV_X64_MSR_SVERSION: + *pdata = synic->version; + break; + case HV_X64_MSR_SIEFP: + *pdata = synic->evt_page; + break; + case HV_X64_MSR_SIMP: + *pdata = synic->msg_page; + break; + case HV_X64_MSR_EOM: + *pdata = 0; + break; + case HV_X64_MSR_SINT0 ... HV_X64_MSR_SINT15: + *pdata = atomic64_read(&synic->sint[msr - HV_X64_MSR_SINT0]); + break; + default: + ret = 1; + break; + } + return ret; +} + +static int synic_set_irq(struct kvm_vcpu_hv_synic *synic, u32 sint) +{ + struct kvm_vcpu *vcpu = synic_to_vcpu(synic); + struct kvm_lapic_irq irq; + int ret, vector; + + if (sint >= ARRAY_SIZE(synic->sint)) + return -EINVAL; + + vector = synic_get_sint_vector(synic_read_sint(synic, sint)); + if (vector < 0) + return -ENOENT; + + memset(&irq, 0, sizeof(irq)); + irq.shorthand = APIC_DEST_SELF; + irq.dest_mode = APIC_DEST_PHYSICAL; + irq.delivery_mode = APIC_DM_FIXED; + irq.vector = vector; + irq.level = 1; + + ret = kvm_irq_delivery_to_apic(vcpu->kvm, vcpu->arch.apic, &irq, NULL); + trace_kvm_hv_synic_set_irq(vcpu->vcpu_id, sint, irq.vector, ret); + return ret; +} + +int kvm_hv_synic_set_irq(struct kvm *kvm, u32 vpidx, u32 sint) +{ + struct kvm_vcpu_hv_synic *synic; + + synic = synic_get(kvm, vpidx); + if (!synic) + return -EINVAL; + + return synic_set_irq(synic, sint); +} + +void kvm_hv_synic_send_eoi(struct kvm_vcpu *vcpu, int vector) +{ + struct kvm_vcpu_hv_synic *synic = vcpu_to_synic(vcpu); + int i; + + trace_kvm_hv_synic_send_eoi(vcpu->vcpu_id, vector); + + for (i = 0; i < ARRAY_SIZE(synic->sint); i++) + if (synic_get_sint_vector(synic_read_sint(synic, i)) == vector) + kvm_hv_notify_acked_sint(vcpu, i); +} + +static int kvm_hv_set_sint_gsi(struct kvm *kvm, u32 vpidx, u32 sint, int gsi) +{ + struct kvm_vcpu_hv_synic *synic; + + synic = synic_get(kvm, vpidx); + if (!synic) + return -EINVAL; + + if (sint >= ARRAY_SIZE(synic->sint_to_gsi)) + return -EINVAL; + + atomic_set(&synic->sint_to_gsi[sint], gsi); + return 0; +} + +void kvm_hv_irq_routing_update(struct kvm *kvm) +{ + struct kvm_irq_routing_table *irq_rt; + struct kvm_kernel_irq_routing_entry *e; + u32 gsi; + + irq_rt = srcu_dereference_check(kvm->irq_routing, &kvm->irq_srcu, + lockdep_is_held(&kvm->irq_lock)); + + for (gsi = 0; gsi < irq_rt->nr_rt_entries; gsi++) { + hlist_for_each_entry(e, &irq_rt->map[gsi], link) { + if (e->type == KVM_IRQ_ROUTING_HV_SINT) + kvm_hv_set_sint_gsi(kvm, e->hv_sint.vcpu, + e->hv_sint.sint, gsi); + } + } +} + +static void synic_init(struct kvm_vcpu_hv_synic *synic) +{ + int i; + + memset(synic, 0, sizeof(*synic)); + synic->version = HV_SYNIC_VERSION_1; + for (i = 0; i < ARRAY_SIZE(synic->sint); i++) { + atomic64_set(&synic->sint[i], HV_SYNIC_SINT_MASKED); + atomic_set(&synic->sint_to_gsi[i], -1); + } +} + +static u64 get_time_ref_counter(struct kvm *kvm) +{ + struct kvm_hv *hv = &kvm->arch.hyperv; + struct kvm_vcpu *vcpu; + u64 tsc; + + /* + * The guest has not set up the TSC page or the clock isn't + * stable, fall back to get_kvmclock_ns. + */ + if (!hv->tsc_ref.tsc_sequence) + return div_u64(get_kvmclock_ns(kvm), 100); + + vcpu = kvm_get_vcpu(kvm, 0); + tsc = kvm_read_l1_tsc(vcpu, rdtsc()); + return mul_u64_u64_shr(tsc, hv->tsc_ref.tsc_scale, 64) + + hv->tsc_ref.tsc_offset; +} + +static void stimer_mark_pending(struct kvm_vcpu_hv_stimer *stimer, + bool vcpu_kick) +{ + struct kvm_vcpu *vcpu = stimer_to_vcpu(stimer); + + set_bit(stimer->index, + vcpu_to_hv_vcpu(vcpu)->stimer_pending_bitmap); + kvm_make_request(KVM_REQ_HV_STIMER, vcpu); + if (vcpu_kick) + kvm_vcpu_kick(vcpu); +} + +static void stimer_cleanup(struct kvm_vcpu_hv_stimer *stimer) +{ + struct kvm_vcpu *vcpu = stimer_to_vcpu(stimer); + + trace_kvm_hv_stimer_cleanup(stimer_to_vcpu(stimer)->vcpu_id, + stimer->index); + + hrtimer_cancel(&stimer->timer); + clear_bit(stimer->index, + vcpu_to_hv_vcpu(vcpu)->stimer_pending_bitmap); + stimer->msg_pending = false; + stimer->exp_time = 0; +} + +static enum hrtimer_restart stimer_timer_callback(struct hrtimer *timer) +{ + struct kvm_vcpu_hv_stimer *stimer; + + stimer = container_of(timer, struct kvm_vcpu_hv_stimer, timer); + trace_kvm_hv_stimer_callback(stimer_to_vcpu(stimer)->vcpu_id, + stimer->index); + stimer_mark_pending(stimer, true); + + return HRTIMER_NORESTART; +} + +/* + * stimer_start() assumptions: + * a) stimer->count is not equal to 0 + * b) stimer->config has HV_STIMER_ENABLE flag + */ +static int stimer_start(struct kvm_vcpu_hv_stimer *stimer) +{ + u64 time_now; + ktime_t ktime_now; + + time_now = get_time_ref_counter(stimer_to_vcpu(stimer)->kvm); + ktime_now = ktime_get(); + + if (stimer->config & HV_STIMER_PERIODIC) { + if (stimer->exp_time) { + if (time_now >= stimer->exp_time) { + u64 remainder; + + div64_u64_rem(time_now - stimer->exp_time, + stimer->count, &remainder); + stimer->exp_time = + time_now + (stimer->count - remainder); + } + } else + stimer->exp_time = time_now + stimer->count; + + trace_kvm_hv_stimer_start_periodic( + stimer_to_vcpu(stimer)->vcpu_id, + stimer->index, + time_now, stimer->exp_time); + + hrtimer_start(&stimer->timer, + ktime_add_ns(ktime_now, + 100 * (stimer->exp_time - time_now)), + HRTIMER_MODE_ABS); + return 0; + } + stimer->exp_time = stimer->count; + if (time_now >= stimer->count) { + /* + * Expire timer according to Hypervisor Top-Level Functional + * specification v4(15.3.1): + * "If a one shot is enabled and the specified count is in + * the past, it will expire immediately." + */ + stimer_mark_pending(stimer, false); + return 0; + } + + trace_kvm_hv_stimer_start_one_shot(stimer_to_vcpu(stimer)->vcpu_id, + stimer->index, + time_now, stimer->count); + + hrtimer_start(&stimer->timer, + ktime_add_ns(ktime_now, 100 * (stimer->count - time_now)), + HRTIMER_MODE_ABS); + return 0; +} + +static int stimer_set_config(struct kvm_vcpu_hv_stimer *stimer, u64 config, + bool host) +{ + struct kvm_vcpu *vcpu = stimer_to_vcpu(stimer); + struct kvm_vcpu_hv_synic *synic = vcpu_to_synic(vcpu); + + if (!synic->active && (!host || config)) + return 1; + + trace_kvm_hv_stimer_set_config(stimer_to_vcpu(stimer)->vcpu_id, + stimer->index, config, host); + + stimer_cleanup(stimer); + if ((stimer->config & HV_STIMER_ENABLE) && HV_STIMER_SINT(config) == 0) + config &= ~HV_STIMER_ENABLE; + stimer->config = config; + stimer_mark_pending(stimer, false); + return 0; +} + +static int stimer_set_count(struct kvm_vcpu_hv_stimer *stimer, u64 count, + bool host) +{ + struct kvm_vcpu *vcpu = stimer_to_vcpu(stimer); + struct kvm_vcpu_hv_synic *synic = vcpu_to_synic(vcpu); + + if (!synic->active && (!host || count)) + return 1; + + trace_kvm_hv_stimer_set_count(stimer_to_vcpu(stimer)->vcpu_id, + stimer->index, count, host); + + stimer_cleanup(stimer); + stimer->count = count; + if (stimer->count == 0) + stimer->config &= ~HV_STIMER_ENABLE; + else if (stimer->config & HV_STIMER_AUTOENABLE) + stimer->config |= HV_STIMER_ENABLE; + stimer_mark_pending(stimer, false); + return 0; +} + +static int stimer_get_config(struct kvm_vcpu_hv_stimer *stimer, u64 *pconfig) +{ + *pconfig = stimer->config; + return 0; +} + +static int stimer_get_count(struct kvm_vcpu_hv_stimer *stimer, u64 *pcount) +{ + *pcount = stimer->count; + return 0; +} + +static int synic_deliver_msg(struct kvm_vcpu_hv_synic *synic, u32 sint, + struct hv_message *src_msg) +{ + struct kvm_vcpu *vcpu = synic_to_vcpu(synic); + struct page *page; + gpa_t gpa; + struct hv_message *dst_msg; + int r; + struct hv_message_page *msg_page; + + if (!(synic->msg_page & HV_SYNIC_SIMP_ENABLE)) + return -ENOENT; + + gpa = synic->msg_page & PAGE_MASK; + page = kvm_vcpu_gfn_to_page(vcpu, gpa >> PAGE_SHIFT); + if (is_error_page(page)) + return -EFAULT; + + msg_page = kmap_atomic(page); + dst_msg = &msg_page->sint_message[sint]; + if (sync_cmpxchg(&dst_msg->header.message_type, HVMSG_NONE, + src_msg->header.message_type) != HVMSG_NONE) { + dst_msg->header.message_flags.msg_pending = 1; + r = -EAGAIN; + } else { + memcpy(&dst_msg->u.payload, &src_msg->u.payload, + src_msg->header.payload_size); + dst_msg->header.message_type = src_msg->header.message_type; + dst_msg->header.payload_size = src_msg->header.payload_size; + r = synic_set_irq(synic, sint); + if (r >= 1) + r = 0; + else if (r == 0) + r = -EFAULT; + } + kunmap_atomic(msg_page); + kvm_release_page_dirty(page); + kvm_vcpu_mark_page_dirty(vcpu, gpa >> PAGE_SHIFT); + return r; +} + +static int stimer_send_msg(struct kvm_vcpu_hv_stimer *stimer) +{ + struct kvm_vcpu *vcpu = stimer_to_vcpu(stimer); + struct hv_message *msg = &stimer->msg; + struct hv_timer_message_payload *payload = + (struct hv_timer_message_payload *)&msg->u.payload; + + payload->expiration_time = stimer->exp_time; + payload->delivery_time = get_time_ref_counter(vcpu->kvm); + return synic_deliver_msg(vcpu_to_synic(vcpu), + HV_STIMER_SINT(stimer->config), msg); +} + +static void stimer_expiration(struct kvm_vcpu_hv_stimer *stimer) +{ + int r; + + stimer->msg_pending = true; + r = stimer_send_msg(stimer); + trace_kvm_hv_stimer_expiration(stimer_to_vcpu(stimer)->vcpu_id, + stimer->index, r); + if (!r) { + stimer->msg_pending = false; + if (!(stimer->config & HV_STIMER_PERIODIC)) + stimer->config &= ~HV_STIMER_ENABLE; + } +} + +void kvm_hv_process_stimers(struct kvm_vcpu *vcpu) +{ + struct kvm_vcpu_hv *hv_vcpu = vcpu_to_hv_vcpu(vcpu); + struct kvm_vcpu_hv_stimer *stimer; + u64 time_now, exp_time; + int i; + + for (i = 0; i < ARRAY_SIZE(hv_vcpu->stimer); i++) + if (test_and_clear_bit(i, hv_vcpu->stimer_pending_bitmap)) { + stimer = &hv_vcpu->stimer[i]; + if (stimer->config & HV_STIMER_ENABLE) { + exp_time = stimer->exp_time; + + if (exp_time) { + time_now = + get_time_ref_counter(vcpu->kvm); + if (time_now >= exp_time) + stimer_expiration(stimer); + } + + if ((stimer->config & HV_STIMER_ENABLE) && + stimer->count) { + if (!stimer->msg_pending) + stimer_start(stimer); + } else + stimer_cleanup(stimer); + } + } +} + +void kvm_hv_vcpu_uninit(struct kvm_vcpu *vcpu) +{ + struct kvm_vcpu_hv *hv_vcpu = vcpu_to_hv_vcpu(vcpu); + int i; + + for (i = 0; i < ARRAY_SIZE(hv_vcpu->stimer); i++) + stimer_cleanup(&hv_vcpu->stimer[i]); +} + +bool kvm_hv_assist_page_enabled(struct kvm_vcpu *vcpu) +{ + if (!(vcpu->arch.hyperv.hv_vapic & HV_X64_MSR_VP_ASSIST_PAGE_ENABLE)) + return false; + return vcpu->arch.pv_eoi.msr_val & KVM_MSR_ENABLED; +} +EXPORT_SYMBOL_GPL(kvm_hv_assist_page_enabled); + +bool kvm_hv_get_assist_page(struct kvm_vcpu *vcpu, + struct hv_vp_assist_page *assist_page) +{ + if (!kvm_hv_assist_page_enabled(vcpu)) + return false; + return !kvm_read_guest_cached(vcpu->kvm, &vcpu->arch.pv_eoi.data, + assist_page, sizeof(*assist_page)); +} +EXPORT_SYMBOL_GPL(kvm_hv_get_assist_page); + +static void stimer_prepare_msg(struct kvm_vcpu_hv_stimer *stimer) +{ + struct hv_message *msg = &stimer->msg; + struct hv_timer_message_payload *payload = + (struct hv_timer_message_payload *)&msg->u.payload; + + memset(&msg->header, 0, sizeof(msg->header)); + msg->header.message_type = HVMSG_TIMER_EXPIRED; + msg->header.payload_size = sizeof(*payload); + + payload->timer_index = stimer->index; + payload->expiration_time = 0; + payload->delivery_time = 0; +} + +static void stimer_init(struct kvm_vcpu_hv_stimer *stimer, int timer_index) +{ + memset(stimer, 0, sizeof(*stimer)); + stimer->index = timer_index; + hrtimer_init(&stimer->timer, CLOCK_MONOTONIC, HRTIMER_MODE_ABS); + stimer->timer.function = stimer_timer_callback; + stimer_prepare_msg(stimer); +} + +void kvm_hv_vcpu_init(struct kvm_vcpu *vcpu) +{ + struct kvm_vcpu_hv *hv_vcpu = vcpu_to_hv_vcpu(vcpu); + int i; + + synic_init(&hv_vcpu->synic); + + bitmap_zero(hv_vcpu->stimer_pending_bitmap, HV_SYNIC_STIMER_COUNT); + for (i = 0; i < ARRAY_SIZE(hv_vcpu->stimer); i++) + stimer_init(&hv_vcpu->stimer[i], i); +} + +void kvm_hv_vcpu_postcreate(struct kvm_vcpu *vcpu) +{ + struct kvm_vcpu_hv *hv_vcpu = vcpu_to_hv_vcpu(vcpu); + + hv_vcpu->vp_index = kvm_vcpu_get_idx(vcpu); +} + +int kvm_hv_activate_synic(struct kvm_vcpu *vcpu, bool dont_zero_synic_pages) +{ + struct kvm_vcpu_hv_synic *synic = vcpu_to_synic(vcpu); + + /* + * Hyper-V SynIC auto EOI SINT's are + * not compatible with APICV, so deactivate APICV + */ + kvm_vcpu_deactivate_apicv(vcpu); + synic->active = true; + synic->dont_zero_synic_pages = dont_zero_synic_pages; + return 0; +} + +static bool kvm_hv_msr_partition_wide(u32 msr) +{ + bool r = false; + + switch (msr) { + case HV_X64_MSR_GUEST_OS_ID: + case HV_X64_MSR_HYPERCALL: + case HV_X64_MSR_REFERENCE_TSC: + case HV_X64_MSR_TIME_REF_COUNT: + case HV_X64_MSR_CRASH_CTL: + case HV_X64_MSR_CRASH_P0 ... HV_X64_MSR_CRASH_P4: + case HV_X64_MSR_RESET: + case HV_X64_MSR_REENLIGHTENMENT_CONTROL: + case HV_X64_MSR_TSC_EMULATION_CONTROL: + case HV_X64_MSR_TSC_EMULATION_STATUS: + r = true; + break; + } + + return r; +} + +static int kvm_hv_msr_get_crash_data(struct kvm_vcpu *vcpu, + u32 index, u64 *pdata) +{ + struct kvm_hv *hv = &vcpu->kvm->arch.hyperv; + size_t size = ARRAY_SIZE(hv->hv_crash_param); + + if (WARN_ON_ONCE(index >= size)) + return -EINVAL; + + *pdata = hv->hv_crash_param[array_index_nospec(index, size)]; + return 0; +} + +static int kvm_hv_msr_get_crash_ctl(struct kvm_vcpu *vcpu, u64 *pdata) +{ + struct kvm_hv *hv = &vcpu->kvm->arch.hyperv; + + *pdata = hv->hv_crash_ctl; + return 0; +} + +static int kvm_hv_msr_set_crash_ctl(struct kvm_vcpu *vcpu, u64 data, bool host) +{ + struct kvm_hv *hv = &vcpu->kvm->arch.hyperv; + + if (host) + hv->hv_crash_ctl = data & HV_X64_MSR_CRASH_CTL_NOTIFY; + + if (!host && (data & HV_X64_MSR_CRASH_CTL_NOTIFY)) { + + vcpu_debug(vcpu, "hv crash (0x%llx 0x%llx 0x%llx 0x%llx 0x%llx)\n", + hv->hv_crash_param[0], + hv->hv_crash_param[1], + hv->hv_crash_param[2], + hv->hv_crash_param[3], + hv->hv_crash_param[4]); + + /* Send notification about crash to user space */ + kvm_make_request(KVM_REQ_HV_CRASH, vcpu); + } + + return 0; +} + +static int kvm_hv_msr_set_crash_data(struct kvm_vcpu *vcpu, + u32 index, u64 data) +{ + struct kvm_hv *hv = &vcpu->kvm->arch.hyperv; + size_t size = ARRAY_SIZE(hv->hv_crash_param); + + if (WARN_ON_ONCE(index >= size)) + return -EINVAL; + + hv->hv_crash_param[array_index_nospec(index, size)] = data; + return 0; +} + +/* + * The kvmclock and Hyper-V TSC page use similar formulas, and converting + * between them is possible: + * + * kvmclock formula: + * nsec = (ticks - tsc_timestamp) * tsc_to_system_mul * 2^(tsc_shift-32) + * + system_time + * + * Hyper-V formula: + * nsec/100 = ticks * scale / 2^64 + offset + * + * When tsc_timestamp = system_time = 0, offset is zero in the Hyper-V formula. + * By dividing the kvmclock formula by 100 and equating what's left we get: + * ticks * scale / 2^64 = ticks * tsc_to_system_mul * 2^(tsc_shift-32) / 100 + * scale / 2^64 = tsc_to_system_mul * 2^(tsc_shift-32) / 100 + * scale = tsc_to_system_mul * 2^(32+tsc_shift) / 100 + * + * Now expand the kvmclock formula and divide by 100: + * nsec = ticks * tsc_to_system_mul * 2^(tsc_shift-32) + * - tsc_timestamp * tsc_to_system_mul * 2^(tsc_shift-32) + * + system_time + * nsec/100 = ticks * tsc_to_system_mul * 2^(tsc_shift-32) / 100 + * - tsc_timestamp * tsc_to_system_mul * 2^(tsc_shift-32) / 100 + * + system_time / 100 + * + * Replace tsc_to_system_mul * 2^(tsc_shift-32) / 100 by scale / 2^64: + * nsec/100 = ticks * scale / 2^64 + * - tsc_timestamp * scale / 2^64 + * + system_time / 100 + * + * Equate with the Hyper-V formula so that ticks * scale / 2^64 cancels out: + * offset = system_time / 100 - tsc_timestamp * scale / 2^64 + * + * These two equivalencies are implemented in this function. + */ +static bool compute_tsc_page_parameters(struct pvclock_vcpu_time_info *hv_clock, + HV_REFERENCE_TSC_PAGE *tsc_ref) +{ + u64 max_mul; + + if (!(hv_clock->flags & PVCLOCK_TSC_STABLE_BIT)) + return false; + + /* + * check if scale would overflow, if so we use the time ref counter + * tsc_to_system_mul * 2^(tsc_shift+32) / 100 >= 2^64 + * tsc_to_system_mul / 100 >= 2^(32-tsc_shift) + * tsc_to_system_mul >= 100 * 2^(32-tsc_shift) + */ + max_mul = 100ull << (32 - hv_clock->tsc_shift); + if (hv_clock->tsc_to_system_mul >= max_mul) + return false; + + /* + * Otherwise compute the scale and offset according to the formulas + * derived above. + */ + tsc_ref->tsc_scale = + mul_u64_u32_div(1ULL << (32 + hv_clock->tsc_shift), + hv_clock->tsc_to_system_mul, + 100); + + tsc_ref->tsc_offset = hv_clock->system_time; + do_div(tsc_ref->tsc_offset, 100); + tsc_ref->tsc_offset -= + mul_u64_u64_shr(hv_clock->tsc_timestamp, tsc_ref->tsc_scale, 64); + return true; +} + +void kvm_hv_setup_tsc_page(struct kvm *kvm, + struct pvclock_vcpu_time_info *hv_clock) +{ + struct kvm_hv *hv = &kvm->arch.hyperv; + u32 tsc_seq; + u64 gfn; + + BUILD_BUG_ON(sizeof(tsc_seq) != sizeof(hv->tsc_ref.tsc_sequence)); + BUILD_BUG_ON(offsetof(HV_REFERENCE_TSC_PAGE, tsc_sequence) != 0); + + if (!(hv->hv_tsc_page & HV_X64_MSR_TSC_REFERENCE_ENABLE)) + return; + + mutex_lock(&kvm->arch.hyperv.hv_lock); + if (!(hv->hv_tsc_page & HV_X64_MSR_TSC_REFERENCE_ENABLE)) + goto out_unlock; + + gfn = hv->hv_tsc_page >> HV_X64_MSR_TSC_REFERENCE_ADDRESS_SHIFT; + /* + * Because the TSC parameters only vary when there is a + * change in the master clock, do not bother with caching. + */ + if (unlikely(kvm_read_guest(kvm, gfn_to_gpa(gfn), + &tsc_seq, sizeof(tsc_seq)))) + goto out_unlock; + + /* + * While we're computing and writing the parameters, force the + * guest to use the time reference count MSR. + */ + hv->tsc_ref.tsc_sequence = 0; + if (kvm_write_guest(kvm, gfn_to_gpa(gfn), + &hv->tsc_ref, sizeof(hv->tsc_ref.tsc_sequence))) + goto out_unlock; + + if (!compute_tsc_page_parameters(hv_clock, &hv->tsc_ref)) + goto out_unlock; + + /* Ensure sequence is zero before writing the rest of the struct. */ + smp_wmb(); + if (kvm_write_guest(kvm, gfn_to_gpa(gfn), &hv->tsc_ref, sizeof(hv->tsc_ref))) + goto out_unlock; + + /* + * Now switch to the TSC page mechanism by writing the sequence. + */ + tsc_seq++; + if (tsc_seq == 0xFFFFFFFF || tsc_seq == 0) + tsc_seq = 1; + + /* Write the struct entirely before the non-zero sequence. */ + smp_wmb(); + + hv->tsc_ref.tsc_sequence = tsc_seq; + kvm_write_guest(kvm, gfn_to_gpa(gfn), + &hv->tsc_ref, sizeof(hv->tsc_ref.tsc_sequence)); +out_unlock: + mutex_unlock(&kvm->arch.hyperv.hv_lock); +} + +static int kvm_hv_set_msr_pw(struct kvm_vcpu *vcpu, u32 msr, u64 data, + bool host) +{ + struct kvm *kvm = vcpu->kvm; + struct kvm_hv *hv = &kvm->arch.hyperv; + + switch (msr) { + case HV_X64_MSR_GUEST_OS_ID: + hv->hv_guest_os_id = data; + /* setting guest os id to zero disables hypercall page */ + if (!hv->hv_guest_os_id) + hv->hv_hypercall &= ~HV_X64_MSR_HYPERCALL_ENABLE; + break; + case HV_X64_MSR_HYPERCALL: { + u64 gfn; + unsigned long addr; + u8 instructions[4]; + + /* if guest os id is not set hypercall should remain disabled */ + if (!hv->hv_guest_os_id) + break; + if (!(data & HV_X64_MSR_HYPERCALL_ENABLE)) { + hv->hv_hypercall = data; + break; + } + gfn = data >> HV_X64_MSR_HYPERCALL_PAGE_ADDRESS_SHIFT; + addr = gfn_to_hva(kvm, gfn); + if (kvm_is_error_hva(addr)) + return 1; + kvm_x86_ops->patch_hypercall(vcpu, instructions); + ((unsigned char *)instructions)[3] = 0xc3; /* ret */ + if (__copy_to_user((void __user *)addr, instructions, 4)) + return 1; + hv->hv_hypercall = data; + mark_page_dirty(kvm, gfn); + break; + } + case HV_X64_MSR_REFERENCE_TSC: + hv->hv_tsc_page = data; + if (hv->hv_tsc_page & HV_X64_MSR_TSC_REFERENCE_ENABLE) + kvm_make_request(KVM_REQ_MASTERCLOCK_UPDATE, vcpu); + break; + case HV_X64_MSR_CRASH_P0 ... HV_X64_MSR_CRASH_P4: + return kvm_hv_msr_set_crash_data(vcpu, + msr - HV_X64_MSR_CRASH_P0, + data); + case HV_X64_MSR_CRASH_CTL: + return kvm_hv_msr_set_crash_ctl(vcpu, data, host); + case HV_X64_MSR_RESET: + if (data == 1) { + vcpu_debug(vcpu, "hyper-v reset requested\n"); + kvm_make_request(KVM_REQ_HV_RESET, vcpu); + } + break; + case HV_X64_MSR_REENLIGHTENMENT_CONTROL: + hv->hv_reenlightenment_control = data; + break; + case HV_X64_MSR_TSC_EMULATION_CONTROL: + hv->hv_tsc_emulation_control = data; + break; + case HV_X64_MSR_TSC_EMULATION_STATUS: + hv->hv_tsc_emulation_status = data; + break; + case HV_X64_MSR_TIME_REF_COUNT: + /* read-only, but still ignore it if host-initiated */ + if (!host) + return 1; + break; + default: + vcpu_unimpl(vcpu, "Hyper-V uhandled wrmsr: 0x%x data 0x%llx\n", + msr, data); + return 1; + } + return 0; +} + +/* Calculate cpu time spent by current task in 100ns units */ +static u64 current_task_runtime_100ns(void) +{ + u64 utime, stime; + + task_cputime_adjusted(current, &utime, &stime); + + return div_u64(utime + stime, 100); +} + +static int kvm_hv_set_msr(struct kvm_vcpu *vcpu, u32 msr, u64 data, bool host) +{ + struct kvm_vcpu_hv *hv_vcpu = &vcpu->arch.hyperv; + + switch (msr) { + case HV_X64_MSR_VP_INDEX: { + struct kvm_hv *hv = &vcpu->kvm->arch.hyperv; + int vcpu_idx = kvm_vcpu_get_idx(vcpu); + u32 new_vp_index = (u32)data; + + if (!host || new_vp_index >= KVM_MAX_VCPUS) + return 1; + + if (new_vp_index == hv_vcpu->vp_index) + return 0; + + /* + * The VP index is initialized to vcpu_index by + * kvm_hv_vcpu_postcreate so they initially match. Now the + * VP index is changing, adjust num_mismatched_vp_indexes if + * it now matches or no longer matches vcpu_idx. + */ + if (hv_vcpu->vp_index == vcpu_idx) + atomic_inc(&hv->num_mismatched_vp_indexes); + else if (new_vp_index == vcpu_idx) + atomic_dec(&hv->num_mismatched_vp_indexes); + + hv_vcpu->vp_index = new_vp_index; + break; + } + case HV_X64_MSR_VP_ASSIST_PAGE: { + u64 gfn; + unsigned long addr; + + if (!(data & HV_X64_MSR_VP_ASSIST_PAGE_ENABLE)) { + hv_vcpu->hv_vapic = data; + if (kvm_lapic_enable_pv_eoi(vcpu, 0, 0)) + return 1; + break; + } + gfn = data >> HV_X64_MSR_VP_ASSIST_PAGE_ADDRESS_SHIFT; + addr = kvm_vcpu_gfn_to_hva(vcpu, gfn); + if (kvm_is_error_hva(addr)) + return 1; + if (__clear_user((void __user *)addr, PAGE_SIZE)) + return 1; + hv_vcpu->hv_vapic = data; + kvm_vcpu_mark_page_dirty(vcpu, gfn); + if (kvm_lapic_enable_pv_eoi(vcpu, + gfn_to_gpa(gfn) | KVM_MSR_ENABLED, + sizeof(struct hv_vp_assist_page))) + return 1; + break; + } + case HV_X64_MSR_EOI: + return kvm_hv_vapic_msr_write(vcpu, APIC_EOI, data); + case HV_X64_MSR_ICR: + return kvm_hv_vapic_msr_write(vcpu, APIC_ICR, data); + case HV_X64_MSR_TPR: + return kvm_hv_vapic_msr_write(vcpu, APIC_TASKPRI, data); + case HV_X64_MSR_VP_RUNTIME: + if (!host) + return 1; + hv_vcpu->runtime_offset = data - current_task_runtime_100ns(); + break; + case HV_X64_MSR_SCONTROL: + case HV_X64_MSR_SVERSION: + case HV_X64_MSR_SIEFP: + case HV_X64_MSR_SIMP: + case HV_X64_MSR_EOM: + case HV_X64_MSR_SINT0 ... HV_X64_MSR_SINT15: + return synic_set_msr(vcpu_to_synic(vcpu), msr, data, host); + case HV_X64_MSR_STIMER0_CONFIG: + case HV_X64_MSR_STIMER1_CONFIG: + case HV_X64_MSR_STIMER2_CONFIG: + case HV_X64_MSR_STIMER3_CONFIG: { + int timer_index = (msr - HV_X64_MSR_STIMER0_CONFIG)/2; + + return stimer_set_config(vcpu_to_stimer(vcpu, timer_index), + data, host); + } + case HV_X64_MSR_STIMER0_COUNT: + case HV_X64_MSR_STIMER1_COUNT: + case HV_X64_MSR_STIMER2_COUNT: + case HV_X64_MSR_STIMER3_COUNT: { + int timer_index = (msr - HV_X64_MSR_STIMER0_COUNT)/2; + + return stimer_set_count(vcpu_to_stimer(vcpu, timer_index), + data, host); + } + case HV_X64_MSR_TSC_FREQUENCY: + case HV_X64_MSR_APIC_FREQUENCY: + /* read-only, but still ignore it if host-initiated */ + if (!host) + return 1; + break; + default: + vcpu_unimpl(vcpu, "Hyper-V uhandled wrmsr: 0x%x data 0x%llx\n", + msr, data); + return 1; + } + + return 0; +} + +static int kvm_hv_get_msr_pw(struct kvm_vcpu *vcpu, u32 msr, u64 *pdata) +{ + u64 data = 0; + struct kvm *kvm = vcpu->kvm; + struct kvm_hv *hv = &kvm->arch.hyperv; + + switch (msr) { + case HV_X64_MSR_GUEST_OS_ID: + data = hv->hv_guest_os_id; + break; + case HV_X64_MSR_HYPERCALL: + data = hv->hv_hypercall; + break; + case HV_X64_MSR_TIME_REF_COUNT: + data = get_time_ref_counter(kvm); + break; + case HV_X64_MSR_REFERENCE_TSC: + data = hv->hv_tsc_page; + break; + case HV_X64_MSR_CRASH_P0 ... HV_X64_MSR_CRASH_P4: + return kvm_hv_msr_get_crash_data(vcpu, + msr - HV_X64_MSR_CRASH_P0, + pdata); + case HV_X64_MSR_CRASH_CTL: + return kvm_hv_msr_get_crash_ctl(vcpu, pdata); + case HV_X64_MSR_RESET: + data = 0; + break; + case HV_X64_MSR_REENLIGHTENMENT_CONTROL: + data = hv->hv_reenlightenment_control; + break; + case HV_X64_MSR_TSC_EMULATION_CONTROL: + data = hv->hv_tsc_emulation_control; + break; + case HV_X64_MSR_TSC_EMULATION_STATUS: + data = hv->hv_tsc_emulation_status; + break; + default: + vcpu_unimpl(vcpu, "Hyper-V unhandled rdmsr: 0x%x\n", msr); + return 1; + } + + *pdata = data; + return 0; +} + +static int kvm_hv_get_msr(struct kvm_vcpu *vcpu, u32 msr, u64 *pdata, + bool host) +{ + u64 data = 0; + struct kvm_vcpu_hv *hv_vcpu = &vcpu->arch.hyperv; + + switch (msr) { + case HV_X64_MSR_VP_INDEX: + data = hv_vcpu->vp_index; + break; + case HV_X64_MSR_EOI: + return kvm_hv_vapic_msr_read(vcpu, APIC_EOI, pdata); + case HV_X64_MSR_ICR: + return kvm_hv_vapic_msr_read(vcpu, APIC_ICR, pdata); + case HV_X64_MSR_TPR: + return kvm_hv_vapic_msr_read(vcpu, APIC_TASKPRI, pdata); + case HV_X64_MSR_VP_ASSIST_PAGE: + data = hv_vcpu->hv_vapic; + break; + case HV_X64_MSR_VP_RUNTIME: + data = current_task_runtime_100ns() + hv_vcpu->runtime_offset; + break; + case HV_X64_MSR_SCONTROL: + case HV_X64_MSR_SVERSION: + case HV_X64_MSR_SIEFP: + case HV_X64_MSR_SIMP: + case HV_X64_MSR_EOM: + case HV_X64_MSR_SINT0 ... HV_X64_MSR_SINT15: + return synic_get_msr(vcpu_to_synic(vcpu), msr, pdata, host); + case HV_X64_MSR_STIMER0_CONFIG: + case HV_X64_MSR_STIMER1_CONFIG: + case HV_X64_MSR_STIMER2_CONFIG: + case HV_X64_MSR_STIMER3_CONFIG: { + int timer_index = (msr - HV_X64_MSR_STIMER0_CONFIG)/2; + + return stimer_get_config(vcpu_to_stimer(vcpu, timer_index), + pdata); + } + case HV_X64_MSR_STIMER0_COUNT: + case HV_X64_MSR_STIMER1_COUNT: + case HV_X64_MSR_STIMER2_COUNT: + case HV_X64_MSR_STIMER3_COUNT: { + int timer_index = (msr - HV_X64_MSR_STIMER0_COUNT)/2; + + return stimer_get_count(vcpu_to_stimer(vcpu, timer_index), + pdata); + } + case HV_X64_MSR_TSC_FREQUENCY: + data = (u64)vcpu->arch.virtual_tsc_khz * 1000; + break; + case HV_X64_MSR_APIC_FREQUENCY: + data = APIC_BUS_FREQUENCY; + break; + default: + vcpu_unimpl(vcpu, "Hyper-V unhandled rdmsr: 0x%x\n", msr); + return 1; + } + *pdata = data; + return 0; +} + +int kvm_hv_set_msr_common(struct kvm_vcpu *vcpu, u32 msr, u64 data, bool host) +{ + if (kvm_hv_msr_partition_wide(msr)) { + int r; + + mutex_lock(&vcpu->kvm->arch.hyperv.hv_lock); + r = kvm_hv_set_msr_pw(vcpu, msr, data, host); + mutex_unlock(&vcpu->kvm->arch.hyperv.hv_lock); + return r; + } else + return kvm_hv_set_msr(vcpu, msr, data, host); +} + +int kvm_hv_get_msr_common(struct kvm_vcpu *vcpu, u32 msr, u64 *pdata, bool host) +{ + if (kvm_hv_msr_partition_wide(msr)) { + int r; + + mutex_lock(&vcpu->kvm->arch.hyperv.hv_lock); + r = kvm_hv_get_msr_pw(vcpu, msr, pdata); + mutex_unlock(&vcpu->kvm->arch.hyperv.hv_lock); + return r; + } else + return kvm_hv_get_msr(vcpu, msr, pdata, host); +} + +static __always_inline int get_sparse_bank_no(u64 valid_bank_mask, int bank_no) +{ + int i = 0, j; + + if (!(valid_bank_mask & BIT_ULL(bank_no))) + return -1; + + for (j = 0; j < bank_no; j++) + if (valid_bank_mask & BIT_ULL(j)) + i++; + + return i; +} + +static u64 kvm_hv_flush_tlb(struct kvm_vcpu *current_vcpu, u64 ingpa, + u16 rep_cnt, bool ex) +{ + struct kvm *kvm = current_vcpu->kvm; + struct kvm_vcpu_hv *hv_current = ¤t_vcpu->arch.hyperv; + struct hv_tlb_flush_ex flush_ex; + struct hv_tlb_flush flush; + struct kvm_vcpu *vcpu; + unsigned long vcpu_bitmap[BITS_TO_LONGS(KVM_MAX_VCPUS)] = {0}; + unsigned long valid_bank_mask = 0; + u64 sparse_banks[64]; + int sparse_banks_len, i; + bool all_cpus; + + if (!ex) { + if (unlikely(kvm_read_guest(kvm, ingpa, &flush, sizeof(flush)))) + return HV_STATUS_INVALID_HYPERCALL_INPUT; + + trace_kvm_hv_flush_tlb(flush.processor_mask, + flush.address_space, flush.flags); + + sparse_banks[0] = flush.processor_mask; + + /* + * Work around possible WS2012 bug: it sends hypercalls + * with processor_mask = 0x0 and HV_FLUSH_ALL_PROCESSORS clear, + * while also expecting us to flush something and crashing if + * we don't. Let's treat processor_mask == 0 same as + * HV_FLUSH_ALL_PROCESSORS. + */ + all_cpus = (flush.flags & HV_FLUSH_ALL_PROCESSORS) || + flush.processor_mask == 0; + } else { + if (unlikely(kvm_read_guest(kvm, ingpa, &flush_ex, + sizeof(flush_ex)))) + return HV_STATUS_INVALID_HYPERCALL_INPUT; + + trace_kvm_hv_flush_tlb_ex(flush_ex.hv_vp_set.valid_bank_mask, + flush_ex.hv_vp_set.format, + flush_ex.address_space, + flush_ex.flags); + + valid_bank_mask = flush_ex.hv_vp_set.valid_bank_mask; + all_cpus = flush_ex.hv_vp_set.format != + HV_GENERIC_SET_SPARSE_4K; + + sparse_banks_len = bitmap_weight(&valid_bank_mask, 64) * + sizeof(sparse_banks[0]); + + if (!sparse_banks_len && !all_cpus) + goto ret_success; + + if (!all_cpus && + kvm_read_guest(kvm, + ingpa + offsetof(struct hv_tlb_flush_ex, + hv_vp_set.bank_contents), + sparse_banks, + sparse_banks_len)) + return HV_STATUS_INVALID_HYPERCALL_INPUT; + } + + cpumask_clear(&hv_current->tlb_lush); + + kvm_for_each_vcpu(i, vcpu, kvm) { + struct kvm_vcpu_hv *hv = &vcpu->arch.hyperv; + int bank = hv->vp_index / 64, sbank = 0; + + if (!all_cpus) { + /* Banks >64 can't be represented */ + if (bank >= 64) + continue; + + /* Non-ex hypercalls can only address first 64 vCPUs */ + if (!ex && bank) + continue; + + if (ex) { + /* + * Check is the bank of this vCPU is in sparse + * set and get the sparse bank number. + */ + sbank = get_sparse_bank_no(valid_bank_mask, + bank); + + if (sbank < 0) + continue; + } + + if (!(sparse_banks[sbank] & BIT_ULL(hv->vp_index % 64))) + continue; + } + + /* + * vcpu->arch.cr3 may not be up-to-date for running vCPUs so we + * can't analyze it here, flush TLB regardless of the specified + * address space. + */ + __set_bit(i, vcpu_bitmap); + } + + kvm_make_vcpus_request_mask(kvm, + KVM_REQ_TLB_FLUSH | KVM_REQUEST_NO_WAKEUP, + vcpu_bitmap, &hv_current->tlb_lush); + +ret_success: + /* We always do full TLB flush, set rep_done = rep_cnt. */ + return (u64)HV_STATUS_SUCCESS | + ((u64)rep_cnt << HV_HYPERCALL_REP_COMP_OFFSET); +} + +bool kvm_hv_hypercall_enabled(struct kvm *kvm) +{ + return READ_ONCE(kvm->arch.hyperv.hv_hypercall) & HV_X64_MSR_HYPERCALL_ENABLE; +} + +static void kvm_hv_hypercall_set_result(struct kvm_vcpu *vcpu, u64 result) +{ + bool longmode; + + longmode = is_64_bit_mode(vcpu); + if (longmode) + kvm_register_write(vcpu, VCPU_REGS_RAX, result); + else { + kvm_register_write(vcpu, VCPU_REGS_RDX, result >> 32); + kvm_register_write(vcpu, VCPU_REGS_RAX, result & 0xffffffff); + } +} + +static int kvm_hv_hypercall_complete(struct kvm_vcpu *vcpu, u64 result) +{ + kvm_hv_hypercall_set_result(vcpu, result); + ++vcpu->stat.hypercalls; + return kvm_skip_emulated_instruction(vcpu); +} + +static int kvm_hv_hypercall_complete_userspace(struct kvm_vcpu *vcpu) +{ + return kvm_hv_hypercall_complete(vcpu, vcpu->run->hyperv.u.hcall.result); +} + +static u16 kvm_hvcall_signal_event(struct kvm_vcpu *vcpu, bool fast, u64 param) +{ + struct eventfd_ctx *eventfd; + + if (unlikely(!fast)) { + int ret; + gpa_t gpa = param; + + if ((gpa & (__alignof__(param) - 1)) || + offset_in_page(gpa) + sizeof(param) > PAGE_SIZE) + return HV_STATUS_INVALID_ALIGNMENT; + + ret = kvm_vcpu_read_guest(vcpu, gpa, ¶m, sizeof(param)); + if (ret < 0) + return HV_STATUS_INVALID_ALIGNMENT; + } + + /* + * Per spec, bits 32-47 contain the extra "flag number". However, we + * have no use for it, and in all known usecases it is zero, so just + * report lookup failure if it isn't. + */ + if (param & 0xffff00000000ULL) + return HV_STATUS_INVALID_PORT_ID; + /* remaining bits are reserved-zero */ + if (param & ~KVM_HYPERV_CONN_ID_MASK) + return HV_STATUS_INVALID_HYPERCALL_INPUT; + + /* the eventfd is protected by vcpu->kvm->srcu, but conn_to_evt isn't */ + rcu_read_lock(); + eventfd = idr_find(&vcpu->kvm->arch.hyperv.conn_to_evt, param); + rcu_read_unlock(); + if (!eventfd) + return HV_STATUS_INVALID_PORT_ID; + + eventfd_signal(eventfd, 1); + return HV_STATUS_SUCCESS; +} + +int kvm_hv_hypercall(struct kvm_vcpu *vcpu) +{ + u64 param, ingpa, outgpa, ret = HV_STATUS_SUCCESS; + uint16_t code, rep_idx, rep_cnt; + bool fast, longmode, rep; + + /* + * hypercall generates UD from non zero cpl and real mode + * per HYPER-V spec + */ + if (kvm_x86_ops->get_cpl(vcpu) != 0 || !is_protmode(vcpu)) { + kvm_queue_exception(vcpu, UD_VECTOR); + return 1; + } + + longmode = is_64_bit_mode(vcpu); + + if (!longmode) { + param = ((u64)kvm_register_read(vcpu, VCPU_REGS_RDX) << 32) | + (kvm_register_read(vcpu, VCPU_REGS_RAX) & 0xffffffff); + ingpa = ((u64)kvm_register_read(vcpu, VCPU_REGS_RBX) << 32) | + (kvm_register_read(vcpu, VCPU_REGS_RCX) & 0xffffffff); + outgpa = ((u64)kvm_register_read(vcpu, VCPU_REGS_RDI) << 32) | + (kvm_register_read(vcpu, VCPU_REGS_RSI) & 0xffffffff); + } +#ifdef CONFIG_X86_64 + else { + param = kvm_register_read(vcpu, VCPU_REGS_RCX); + ingpa = kvm_register_read(vcpu, VCPU_REGS_RDX); + outgpa = kvm_register_read(vcpu, VCPU_REGS_R8); + } +#endif + + code = param & 0xffff; + fast = !!(param & HV_HYPERCALL_FAST_BIT); + rep_cnt = (param >> HV_HYPERCALL_REP_COMP_OFFSET) & 0xfff; + rep_idx = (param >> HV_HYPERCALL_REP_START_OFFSET) & 0xfff; + rep = !!(rep_cnt || rep_idx); + + trace_kvm_hv_hypercall(code, fast, rep_cnt, rep_idx, ingpa, outgpa); + + switch (code) { + case HVCALL_NOTIFY_LONG_SPIN_WAIT: + if (unlikely(rep)) { + ret = HV_STATUS_INVALID_HYPERCALL_INPUT; + break; + } + kvm_vcpu_on_spin(vcpu, true); + break; + case HVCALL_SIGNAL_EVENT: + if (unlikely(rep)) { + ret = HV_STATUS_INVALID_HYPERCALL_INPUT; + break; + } + ret = kvm_hvcall_signal_event(vcpu, fast, ingpa); + if (ret != HV_STATUS_INVALID_PORT_ID) + break; + /* maybe userspace knows this conn_id: fall through */ + case HVCALL_POST_MESSAGE: + /* don't bother userspace if it has no way to handle it */ + if (unlikely(rep || !vcpu_to_synic(vcpu)->active)) { + ret = HV_STATUS_INVALID_HYPERCALL_INPUT; + break; + } + vcpu->run->exit_reason = KVM_EXIT_HYPERV; + vcpu->run->hyperv.type = KVM_EXIT_HYPERV_HCALL; + vcpu->run->hyperv.u.hcall.input = param; + vcpu->run->hyperv.u.hcall.params[0] = ingpa; + vcpu->run->hyperv.u.hcall.params[1] = outgpa; + vcpu->arch.complete_userspace_io = + kvm_hv_hypercall_complete_userspace; + return 0; + case HVCALL_FLUSH_VIRTUAL_ADDRESS_LIST: + if (unlikely(fast || !rep_cnt || rep_idx)) { + ret = HV_STATUS_INVALID_HYPERCALL_INPUT; + break; + } + ret = kvm_hv_flush_tlb(vcpu, ingpa, rep_cnt, false); + break; + case HVCALL_FLUSH_VIRTUAL_ADDRESS_SPACE: + if (unlikely(fast || rep)) { + ret = HV_STATUS_INVALID_HYPERCALL_INPUT; + break; + } + ret = kvm_hv_flush_tlb(vcpu, ingpa, rep_cnt, false); + break; + case HVCALL_FLUSH_VIRTUAL_ADDRESS_LIST_EX: + if (unlikely(fast || !rep_cnt || rep_idx)) { + ret = HV_STATUS_INVALID_HYPERCALL_INPUT; + break; + } + ret = kvm_hv_flush_tlb(vcpu, ingpa, rep_cnt, true); + break; + case HVCALL_FLUSH_VIRTUAL_ADDRESS_SPACE_EX: + if (unlikely(fast || rep)) { + ret = HV_STATUS_INVALID_HYPERCALL_INPUT; + break; + } + ret = kvm_hv_flush_tlb(vcpu, ingpa, rep_cnt, true); + break; + default: + ret = HV_STATUS_INVALID_HYPERCALL_CODE; + break; + } + + return kvm_hv_hypercall_complete(vcpu, ret); +} + +void kvm_hv_init_vm(struct kvm *kvm) +{ + mutex_init(&kvm->arch.hyperv.hv_lock); + idr_init(&kvm->arch.hyperv.conn_to_evt); +} + +void kvm_hv_destroy_vm(struct kvm *kvm) +{ + struct eventfd_ctx *eventfd; + int i; + + idr_for_each_entry(&kvm->arch.hyperv.conn_to_evt, eventfd, i) + eventfd_ctx_put(eventfd); + idr_destroy(&kvm->arch.hyperv.conn_to_evt); +} + +static int kvm_hv_eventfd_assign(struct kvm *kvm, u32 conn_id, int fd) +{ + struct kvm_hv *hv = &kvm->arch.hyperv; + struct eventfd_ctx *eventfd; + int ret; + + eventfd = eventfd_ctx_fdget(fd); + if (IS_ERR(eventfd)) + return PTR_ERR(eventfd); + + mutex_lock(&hv->hv_lock); + ret = idr_alloc(&hv->conn_to_evt, eventfd, conn_id, conn_id + 1, + GFP_KERNEL); + mutex_unlock(&hv->hv_lock); + + if (ret >= 0) + return 0; + + if (ret == -ENOSPC) + ret = -EEXIST; + eventfd_ctx_put(eventfd); + return ret; +} + +static int kvm_hv_eventfd_deassign(struct kvm *kvm, u32 conn_id) +{ + struct kvm_hv *hv = &kvm->arch.hyperv; + struct eventfd_ctx *eventfd; + + mutex_lock(&hv->hv_lock); + eventfd = idr_remove(&hv->conn_to_evt, conn_id); + mutex_unlock(&hv->hv_lock); + + if (!eventfd) + return -ENOENT; + + synchronize_srcu(&kvm->srcu); + eventfd_ctx_put(eventfd); + return 0; +} + +int kvm_vm_ioctl_hv_eventfd(struct kvm *kvm, struct kvm_hyperv_eventfd *args) +{ + if ((args->flags & ~KVM_HYPERV_EVENTFD_DEASSIGN) || + (args->conn_id & ~KVM_HYPERV_CONN_ID_MASK)) + return -EINVAL; + + if (args->flags == KVM_HYPERV_EVENTFD_DEASSIGN) + return kvm_hv_eventfd_deassign(kvm, args->conn_id); + return kvm_hv_eventfd_assign(kvm, args->conn_id, args->fd); +} |