1// SPDX-License-Identifier: GPL-2.0
2/*
3 * Copyright © 2019 Oracle and/or its affiliates. All rights reserved.
4 * Copyright © 2020 Amazon.com, Inc. or its affiliates. All Rights Reserved.
5 *
6 * KVM Xen emulation
7 */
8
9#ifndef __ARCH_X86_KVM_XEN_H__
10#define __ARCH_X86_KVM_XEN_H__
11
12#include <asm/xen/cpuid.h>
13#include <asm/xen/hypervisor.h>
14
15#ifdef CONFIG_KVM_XEN
16#include <linux/jump_label_ratelimit.h>
17
18extern struct static_key_false_deferred kvm_xen_enabled;
19
20int __kvm_xen_has_interrupt(struct kvm_vcpu *vcpu);
21void kvm_xen_inject_pending_events(struct kvm_vcpu *vcpu);
22void kvm_xen_inject_vcpu_vector(struct kvm_vcpu *vcpu);
23int kvm_xen_vcpu_set_attr(struct kvm_vcpu *vcpu, struct kvm_xen_vcpu_attr *data);
24int kvm_xen_vcpu_get_attr(struct kvm_vcpu *vcpu, struct kvm_xen_vcpu_attr *data);
25int kvm_xen_hvm_set_attr(struct kvm *kvm, struct kvm_xen_hvm_attr *data);
26int kvm_xen_hvm_get_attr(struct kvm *kvm, struct kvm_xen_hvm_attr *data);
27int kvm_xen_hvm_evtchn_send(struct kvm *kvm, struct kvm_irq_routing_xen_evtchn *evt);
28int kvm_xen_write_hypercall_page(struct kvm_vcpu *vcpu, u64 data);
29int kvm_xen_hvm_config(struct kvm *kvm, struct kvm_xen_hvm_config *xhc);
30void kvm_xen_init_vm(struct kvm *kvm);
31void kvm_xen_destroy_vm(struct kvm *kvm);
32void kvm_xen_init_vcpu(struct kvm_vcpu *vcpu);
33void kvm_xen_destroy_vcpu(struct kvm_vcpu *vcpu);
34int kvm_xen_set_evtchn_fast(struct kvm_xen_evtchn *xe,
35 struct kvm *kvm);
36int kvm_xen_setup_evtchn(struct kvm *kvm,
37 struct kvm_kernel_irq_routing_entry *e,
38 const struct kvm_irq_routing_entry *ue);
39
40static inline void kvm_xen_sw_enable_lapic(struct kvm_vcpu *vcpu)
41{
42 /*
43 * The local APIC is being enabled. If the per-vCPU upcall vector is
44 * set and the vCPU's evtchn_upcall_pending flag is set, inject the
45 * interrupt.
46 */
47 if (static_branch_unlikely(&kvm_xen_enabled.key) &&
48 vcpu->arch.xen.vcpu_info_cache.active &&
49 vcpu->arch.xen.upcall_vector && __kvm_xen_has_interrupt(vcpu))
50 kvm_xen_inject_vcpu_vector(vcpu);
51}
52
53static inline bool kvm_xen_is_tsc_leaf(struct kvm_vcpu *vcpu, u32 function)
54{
55 return static_branch_unlikely(&kvm_xen_enabled.key) &&
56 vcpu->arch.xen.cpuid.base &&
57 function <= vcpu->arch.xen.cpuid.limit &&
58 function == (vcpu->arch.xen.cpuid.base | XEN_CPUID_LEAF(3));
59}
60
61static inline bool kvm_xen_msr_enabled(struct kvm *kvm)
62{
63 return static_branch_unlikely(&kvm_xen_enabled.key) &&
64 kvm->arch.xen.hvm_config.msr;
65}
66
67static inline bool kvm_xen_is_hypercall_page_msr(struct kvm *kvm, u32 msr)
68{
69 if (!static_branch_unlikely(&kvm_xen_enabled.key))
70 return false;
71
72 return msr && msr == kvm->arch.xen.hvm_config.msr;
73}
74
75static inline bool kvm_xen_hypercall_enabled(struct kvm *kvm)
76{
77 return static_branch_unlikely(&kvm_xen_enabled.key) &&
78 (kvm->arch.xen.hvm_config.flags &
79 KVM_XEN_HVM_CONFIG_INTERCEPT_HCALL);
80}
81
82static inline int kvm_xen_has_interrupt(struct kvm_vcpu *vcpu)
83{
84 if (static_branch_unlikely(&kvm_xen_enabled.key) &&
85 vcpu->arch.xen.vcpu_info_cache.active &&
86 vcpu->kvm->arch.xen.upcall_vector)
87 return __kvm_xen_has_interrupt(vcpu);
88
89 return 0;
90}
91
92static inline bool kvm_xen_has_pending_events(struct kvm_vcpu *vcpu)
93{
94 return static_branch_unlikely(&kvm_xen_enabled.key) &&
95 vcpu->arch.xen.evtchn_pending_sel;
96}
97
98static inline bool kvm_xen_timer_enabled(struct kvm_vcpu *vcpu)
99{
100 return !!vcpu->arch.xen.timer_virq;
101}
102
103static inline int kvm_xen_has_pending_timer(struct kvm_vcpu *vcpu)
104{
105 if (kvm_xen_hypercall_enabled(kvm: vcpu->kvm) && kvm_xen_timer_enabled(vcpu))
106 return atomic_read(v: &vcpu->arch.xen.timer_pending);
107
108 return 0;
109}
110
111void kvm_xen_inject_timer_irqs(struct kvm_vcpu *vcpu);
112#else
113static inline int kvm_xen_write_hypercall_page(struct kvm_vcpu *vcpu, u64 data)
114{
115 return 1;
116}
117
118static inline void kvm_xen_init_vm(struct kvm *kvm)
119{
120}
121
122static inline void kvm_xen_destroy_vm(struct kvm *kvm)
123{
124}
125
126static inline void kvm_xen_init_vcpu(struct kvm_vcpu *vcpu)
127{
128}
129
130static inline void kvm_xen_destroy_vcpu(struct kvm_vcpu *vcpu)
131{
132}
133
134static inline void kvm_xen_sw_enable_lapic(struct kvm_vcpu *vcpu)
135{
136}
137
138static inline bool kvm_xen_msr_enabled(struct kvm *kvm)
139{
140 return false;
141}
142
143static inline bool kvm_xen_is_hypercall_page_msr(struct kvm *kvm, u32 msr)
144{
145 return false;
146}
147
148static inline bool kvm_xen_hypercall_enabled(struct kvm *kvm)
149{
150 return false;
151}
152
153static inline int kvm_xen_has_interrupt(struct kvm_vcpu *vcpu)
154{
155 return 0;
156}
157
158static inline void kvm_xen_inject_pending_events(struct kvm_vcpu *vcpu)
159{
160}
161
162static inline bool kvm_xen_has_pending_events(struct kvm_vcpu *vcpu)
163{
164 return false;
165}
166
167static inline int kvm_xen_has_pending_timer(struct kvm_vcpu *vcpu)
168{
169 return 0;
170}
171
172static inline void kvm_xen_inject_timer_irqs(struct kvm_vcpu *vcpu)
173{
174}
175
176static inline bool kvm_xen_timer_enabled(struct kvm_vcpu *vcpu)
177{
178 return false;
179}
180
181static inline bool kvm_xen_is_tsc_leaf(struct kvm_vcpu *vcpu, u32 function)
182{
183 return false;
184}
185#endif
186
187int kvm_xen_hypercall(struct kvm_vcpu *vcpu);
188
189#include <asm/pvclock-abi.h>
190#include <asm/xen/interface.h>
191#include <xen/interface/vcpu.h>
192
193void kvm_xen_update_runstate(struct kvm_vcpu *vcpu, int state);
194
195static inline void kvm_xen_runstate_set_running(struct kvm_vcpu *vcpu)
196{
197 kvm_xen_update_runstate(vcpu, RUNSTATE_running);
198}
199
200static inline void kvm_xen_runstate_set_preempted(struct kvm_vcpu *vcpu)
201{
202 /*
203 * If the vCPU wasn't preempted but took a normal exit for
204 * some reason (hypercalls, I/O, etc.), that is accounted as
205 * still RUNSTATE_running, as the VMM is still operating on
206 * behalf of the vCPU. Only if the VMM does actually block
207 * does it need to enter RUNSTATE_blocked.
208 */
209 if (WARN_ON_ONCE(!vcpu->preempted))
210 return;
211
212 kvm_xen_update_runstate(vcpu, RUNSTATE_runnable);
213}
214
215/* 32-bit compatibility definitions, also used natively in 32-bit build */
216struct compat_arch_vcpu_info {
217 unsigned int cr2;
218 unsigned int pad[5];
219};
220
221struct compat_vcpu_info {
222 uint8_t evtchn_upcall_pending;
223 uint8_t evtchn_upcall_mask;
224 uint16_t pad;
225 uint32_t evtchn_pending_sel;
226 struct compat_arch_vcpu_info arch;
227 struct pvclock_vcpu_time_info time;
228}; /* 64 bytes (x86) */
229
230struct compat_arch_shared_info {
231 unsigned int max_pfn;
232 unsigned int pfn_to_mfn_frame_list_list;
233 unsigned int nmi_reason;
234 unsigned int p2m_cr3;
235 unsigned int p2m_vaddr;
236 unsigned int p2m_generation;
237 uint32_t wc_sec_hi;
238};
239
240struct compat_shared_info {
241 struct compat_vcpu_info vcpu_info[MAX_VIRT_CPUS];
242 uint32_t evtchn_pending[32];
243 uint32_t evtchn_mask[32];
244 struct pvclock_wall_clock wc;
245 struct compat_arch_shared_info arch;
246};
247
248#define COMPAT_EVTCHN_2L_NR_CHANNELS (8 * \
249 sizeof_field(struct compat_shared_info, \
250 evtchn_pending))
251struct compat_vcpu_runstate_info {
252 int state;
253 uint64_t state_entry_time;
254 uint64_t time[4];
255} __attribute__((packed));
256
257struct compat_sched_poll {
258 /* This is actually a guest virtual address which points to ports. */
259 uint32_t ports;
260 unsigned int nr_ports;
261 uint64_t timeout;
262};
263
264#endif /* __ARCH_X86_KVM_XEN_H__ */
265

source code of linux/arch/x86/kvm/xen.h