2 * KVM Microsoft Hyper-V emulation
4 * derived from arch/x86/kvm/x86.c
6 * Copyright (C) 2006 Qumranet, Inc.
7 * Copyright (C) 2008 Qumranet, Inc.
8 * Copyright IBM Corporation, 2008
9 * Copyright 2010 Red Hat, Inc. and/or its affiliates.
10 * Copyright (C) 2015 Andrey Smetanin <asmetanin@virtuozzo.com>
13 * Avi Kivity <avi@qumranet.com>
14 * Yaniv Kamay <yaniv@qumranet.com>
15 * Amit Shah <amit.shah@qumranet.com>
16 * Ben-Ami Yassour <benami@il.ibm.com>
17 * Andrey Smetanin <asmetanin@virtuozzo.com>
19 * This work is licensed under the terms of the GNU GPL, version 2. See
20 * the COPYING file in the top-level directory.
28 #include <linux/kvm_host.h>
29 #include <linux/nospec.h>
30 #include <trace/events/kvm.h>
34 static bool kvm_hv_msr_partition_wide(u32 msr)
39 case HV_X64_MSR_GUEST_OS_ID:
40 case HV_X64_MSR_HYPERCALL:
41 case HV_X64_MSR_REFERENCE_TSC:
42 case HV_X64_MSR_TIME_REF_COUNT:
43 case HV_X64_MSR_CRASH_CTL:
44 case HV_X64_MSR_CRASH_P0 ... HV_X64_MSR_CRASH_P4:
45 case HV_X64_MSR_RESET:
53 static int kvm_hv_msr_get_crash_data(struct kvm_vcpu *vcpu,
54 u32 index, u64 *pdata)
56 struct kvm_hv *hv = &vcpu->kvm->arch.hyperv;
57 size_t size = ARRAY_SIZE(hv->hv_crash_param);
59 if (WARN_ON_ONCE(index >= size))
62 *pdata = hv->hv_crash_param[array_index_nospec(index, size)];
66 static int kvm_hv_msr_get_crash_ctl(struct kvm_vcpu *vcpu, u64 *pdata)
68 struct kvm_hv *hv = &vcpu->kvm->arch.hyperv;
70 *pdata = hv->hv_crash_ctl;
74 static int kvm_hv_msr_set_crash_ctl(struct kvm_vcpu *vcpu, u64 data, bool host)
76 struct kvm_hv *hv = &vcpu->kvm->arch.hyperv;
79 hv->hv_crash_ctl = data & HV_X64_MSR_CRASH_CTL_NOTIFY;
81 if (!host && (data & HV_X64_MSR_CRASH_CTL_NOTIFY)) {
83 vcpu_debug(vcpu, "hv crash (0x%llx 0x%llx 0x%llx 0x%llx 0x%llx)\n",
84 hv->hv_crash_param[0],
85 hv->hv_crash_param[1],
86 hv->hv_crash_param[2],
87 hv->hv_crash_param[3],
88 hv->hv_crash_param[4]);
90 /* Send notification about crash to user space */
91 kvm_make_request(KVM_REQ_HV_CRASH, vcpu);
97 static int kvm_hv_msr_set_crash_data(struct kvm_vcpu *vcpu,
100 struct kvm_hv *hv = &vcpu->kvm->arch.hyperv;
101 size_t size = ARRAY_SIZE(hv->hv_crash_param);
103 if (WARN_ON_ONCE(index >= size))
106 hv->hv_crash_param[array_index_nospec(index, size)] = data;
110 static int kvm_hv_set_msr_pw(struct kvm_vcpu *vcpu, u32 msr, u64 data,
113 struct kvm *kvm = vcpu->kvm;
114 struct kvm_hv *hv = &kvm->arch.hyperv;
117 case HV_X64_MSR_GUEST_OS_ID:
118 hv->hv_guest_os_id = data;
119 /* setting guest os id to zero disables hypercall page */
120 if (!hv->hv_guest_os_id)
121 hv->hv_hypercall &= ~HV_X64_MSR_HYPERCALL_ENABLE;
123 case HV_X64_MSR_HYPERCALL: {
128 /* if guest os id is not set hypercall should remain disabled */
129 if (!hv->hv_guest_os_id)
131 if (!(data & HV_X64_MSR_HYPERCALL_ENABLE)) {
132 hv->hv_hypercall = data;
135 gfn = data >> HV_X64_MSR_HYPERCALL_PAGE_ADDRESS_SHIFT;
136 addr = gfn_to_hva(kvm, gfn);
137 if (kvm_is_error_hva(addr))
139 kvm_x86_ops->patch_hypercall(vcpu, instructions);
140 ((unsigned char *)instructions)[3] = 0xc3; /* ret */
141 if (__copy_to_user((void __user *)addr, instructions, 4))
143 hv->hv_hypercall = data;
144 mark_page_dirty(kvm, gfn);
147 case HV_X64_MSR_REFERENCE_TSC: {
149 HV_REFERENCE_TSC_PAGE tsc_ref;
151 memset(&tsc_ref, 0, sizeof(tsc_ref));
152 hv->hv_tsc_page = data;
153 if (!(data & HV_X64_MSR_TSC_REFERENCE_ENABLE))
155 gfn = data >> HV_X64_MSR_TSC_REFERENCE_ADDRESS_SHIFT;
158 gfn << HV_X64_MSR_TSC_REFERENCE_ADDRESS_SHIFT,
159 &tsc_ref, sizeof(tsc_ref)))
161 mark_page_dirty(kvm, gfn);
164 case HV_X64_MSR_CRASH_P0 ... HV_X64_MSR_CRASH_P4:
165 return kvm_hv_msr_set_crash_data(vcpu,
166 msr - HV_X64_MSR_CRASH_P0,
168 case HV_X64_MSR_CRASH_CTL:
169 return kvm_hv_msr_set_crash_ctl(vcpu, data, host);
170 case HV_X64_MSR_RESET:
172 vcpu_debug(vcpu, "hyper-v reset requested\n");
173 kvm_make_request(KVM_REQ_HV_RESET, vcpu);
177 vcpu_unimpl(vcpu, "Hyper-V uhandled wrmsr: 0x%x data 0x%llx\n",
184 /* Calculate cpu time spent by current task in 100ns units */
185 static u64 current_task_runtime_100ns(void)
187 cputime_t utime, stime;
189 task_cputime_adjusted(current, &utime, &stime);
190 return div_u64(cputime_to_nsecs(utime + stime), 100);
193 static int kvm_hv_set_msr(struct kvm_vcpu *vcpu, u32 msr, u64 data, bool host)
195 struct kvm_vcpu_hv *hv = &vcpu->arch.hyperv;
198 case HV_X64_MSR_APIC_ASSIST_PAGE: {
202 if (!(data & HV_X64_MSR_APIC_ASSIST_PAGE_ENABLE)) {
204 if (kvm_lapic_enable_pv_eoi(vcpu, 0))
208 gfn = data >> HV_X64_MSR_APIC_ASSIST_PAGE_ADDRESS_SHIFT;
209 addr = kvm_vcpu_gfn_to_hva(vcpu, gfn);
210 if (kvm_is_error_hva(addr))
212 if (__clear_user((void __user *)addr, PAGE_SIZE))
215 kvm_vcpu_mark_page_dirty(vcpu, gfn);
216 if (kvm_lapic_enable_pv_eoi(vcpu,
217 gfn_to_gpa(gfn) | KVM_MSR_ENABLED))
222 return kvm_hv_vapic_msr_write(vcpu, APIC_EOI, data);
224 return kvm_hv_vapic_msr_write(vcpu, APIC_ICR, data);
226 return kvm_hv_vapic_msr_write(vcpu, APIC_TASKPRI, data);
227 case HV_X64_MSR_VP_RUNTIME:
230 hv->runtime_offset = data - current_task_runtime_100ns();
233 vcpu_unimpl(vcpu, "Hyper-V uhandled wrmsr: 0x%x data 0x%llx\n",
241 static int kvm_hv_get_msr_pw(struct kvm_vcpu *vcpu, u32 msr, u64 *pdata)
244 struct kvm *kvm = vcpu->kvm;
245 struct kvm_hv *hv = &kvm->arch.hyperv;
248 case HV_X64_MSR_GUEST_OS_ID:
249 data = hv->hv_guest_os_id;
251 case HV_X64_MSR_HYPERCALL:
252 data = hv->hv_hypercall;
254 case HV_X64_MSR_TIME_REF_COUNT: {
256 div_u64(get_kernel_ns() + kvm->arch.kvmclock_offset, 100);
259 case HV_X64_MSR_REFERENCE_TSC:
260 data = hv->hv_tsc_page;
262 case HV_X64_MSR_CRASH_P0 ... HV_X64_MSR_CRASH_P4:
263 return kvm_hv_msr_get_crash_data(vcpu,
264 msr - HV_X64_MSR_CRASH_P0,
266 case HV_X64_MSR_CRASH_CTL:
267 return kvm_hv_msr_get_crash_ctl(vcpu, pdata);
268 case HV_X64_MSR_RESET:
272 vcpu_unimpl(vcpu, "Hyper-V unhandled rdmsr: 0x%x\n", msr);
280 static int kvm_hv_get_msr(struct kvm_vcpu *vcpu, u32 msr, u64 *pdata)
283 struct kvm_vcpu_hv *hv = &vcpu->arch.hyperv;
286 case HV_X64_MSR_VP_INDEX: {
290 kvm_for_each_vcpu(r, v, vcpu->kvm) {
299 return kvm_hv_vapic_msr_read(vcpu, APIC_EOI, pdata);
301 return kvm_hv_vapic_msr_read(vcpu, APIC_ICR, pdata);
303 return kvm_hv_vapic_msr_read(vcpu, APIC_TASKPRI, pdata);
304 case HV_X64_MSR_APIC_ASSIST_PAGE:
307 case HV_X64_MSR_VP_RUNTIME:
308 data = current_task_runtime_100ns() + hv->runtime_offset;
311 vcpu_unimpl(vcpu, "Hyper-V unhandled rdmsr: 0x%x\n", msr);
318 int kvm_hv_set_msr_common(struct kvm_vcpu *vcpu, u32 msr, u64 data, bool host)
320 if (kvm_hv_msr_partition_wide(msr)) {
323 mutex_lock(&vcpu->kvm->lock);
324 r = kvm_hv_set_msr_pw(vcpu, msr, data, host);
325 mutex_unlock(&vcpu->kvm->lock);
328 return kvm_hv_set_msr(vcpu, msr, data, host);
331 int kvm_hv_get_msr_common(struct kvm_vcpu *vcpu, u32 msr, u64 *pdata)
333 if (kvm_hv_msr_partition_wide(msr)) {
336 mutex_lock(&vcpu->kvm->lock);
337 r = kvm_hv_get_msr_pw(vcpu, msr, pdata);
338 mutex_unlock(&vcpu->kvm->lock);
341 return kvm_hv_get_msr(vcpu, msr, pdata);
344 bool kvm_hv_hypercall_enabled(struct kvm *kvm)
346 return kvm->arch.hyperv.hv_hypercall & HV_X64_MSR_HYPERCALL_ENABLE;
349 int kvm_hv_hypercall(struct kvm_vcpu *vcpu)
351 u64 param, ingpa, outgpa, ret;
352 uint16_t code, rep_idx, rep_cnt, res = HV_STATUS_SUCCESS, rep_done = 0;
356 * hypercall generates UD from non zero cpl and real mode
359 if (kvm_x86_ops->get_cpl(vcpu) != 0 || !is_protmode(vcpu)) {
360 kvm_queue_exception(vcpu, UD_VECTOR);
364 longmode = is_64_bit_mode(vcpu);
367 param = ((u64)kvm_register_read(vcpu, VCPU_REGS_RDX) << 32) |
368 (kvm_register_read(vcpu, VCPU_REGS_RAX) & 0xffffffff);
369 ingpa = ((u64)kvm_register_read(vcpu, VCPU_REGS_RBX) << 32) |
370 (kvm_register_read(vcpu, VCPU_REGS_RCX) & 0xffffffff);
371 outgpa = ((u64)kvm_register_read(vcpu, VCPU_REGS_RDI) << 32) |
372 (kvm_register_read(vcpu, VCPU_REGS_RSI) & 0xffffffff);
376 param = kvm_register_read(vcpu, VCPU_REGS_RCX);
377 ingpa = kvm_register_read(vcpu, VCPU_REGS_RDX);
378 outgpa = kvm_register_read(vcpu, VCPU_REGS_R8);
382 code = param & 0xffff;
383 fast = (param >> 16) & 0x1;
384 rep_cnt = (param >> 32) & 0xfff;
385 rep_idx = (param >> 48) & 0xfff;
387 trace_kvm_hv_hypercall(code, fast, rep_cnt, rep_idx, ingpa, outgpa);
390 case HV_X64_HV_NOTIFY_LONG_SPIN_WAIT:
391 kvm_vcpu_on_spin(vcpu);
394 res = HV_STATUS_INVALID_HYPERCALL_CODE;
398 ret = res | (((u64)rep_done & 0xfff) << 32);
400 kvm_register_write(vcpu, VCPU_REGS_RAX, ret);
402 kvm_register_write(vcpu, VCPU_REGS_RDX, ret >> 32);
403 kvm_register_write(vcpu, VCPU_REGS_RAX, ret & 0xffffffff);