xref: /linux/arch/x86/kvm/xen.h (revision 79790b6818e96c58fe2bffee1b418c16e64e7b80)
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/hypervisor.h>
13 
14 #ifdef CONFIG_KVM_XEN
15 #include <linux/jump_label_ratelimit.h>
16 
17 extern struct static_key_false_deferred kvm_xen_enabled;
18 
19 int __kvm_xen_has_interrupt(struct kvm_vcpu *vcpu);
20 void kvm_xen_inject_pending_events(struct kvm_vcpu *vcpu);
21 void kvm_xen_inject_vcpu_vector(struct kvm_vcpu *vcpu);
22 int kvm_xen_vcpu_set_attr(struct kvm_vcpu *vcpu, struct kvm_xen_vcpu_attr *data);
23 int kvm_xen_vcpu_get_attr(struct kvm_vcpu *vcpu, struct kvm_xen_vcpu_attr *data);
24 int kvm_xen_hvm_set_attr(struct kvm *kvm, struct kvm_xen_hvm_attr *data);
25 int kvm_xen_hvm_get_attr(struct kvm *kvm, struct kvm_xen_hvm_attr *data);
26 int kvm_xen_hvm_evtchn_send(struct kvm *kvm, struct kvm_irq_routing_xen_evtchn *evt);
27 int kvm_xen_write_hypercall_page(struct kvm_vcpu *vcpu, u64 data);
28 int kvm_xen_hvm_config(struct kvm *kvm, struct kvm_xen_hvm_config *xhc);
29 void kvm_xen_init_vm(struct kvm *kvm);
30 void kvm_xen_destroy_vm(struct kvm *kvm);
31 void kvm_xen_init_vcpu(struct kvm_vcpu *vcpu);
32 void kvm_xen_destroy_vcpu(struct kvm_vcpu *vcpu);
33 int kvm_xen_set_evtchn_fast(struct kvm_xen_evtchn *xe,
34 			    struct kvm *kvm);
35 int kvm_xen_setup_evtchn(struct kvm *kvm,
36 			 struct kvm_kernel_irq_routing_entry *e,
37 			 const struct kvm_irq_routing_entry *ue);
38 void kvm_xen_update_tsc_info(struct kvm_vcpu *vcpu);
39 
kvm_xen_sw_enable_lapic(struct kvm_vcpu * vcpu)40 static 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 
kvm_xen_msr_enabled(struct kvm * kvm)53 static inline bool kvm_xen_msr_enabled(struct kvm *kvm)
54 {
55 	return static_branch_unlikely(&kvm_xen_enabled.key) &&
56 		kvm->arch.xen_hvm_config.msr;
57 }
58 
kvm_xen_hypercall_enabled(struct kvm * kvm)59 static inline bool kvm_xen_hypercall_enabled(struct kvm *kvm)
60 {
61 	return static_branch_unlikely(&kvm_xen_enabled.key) &&
62 		(kvm->arch.xen_hvm_config.flags &
63 		 KVM_XEN_HVM_CONFIG_INTERCEPT_HCALL);
64 }
65 
kvm_xen_has_interrupt(struct kvm_vcpu * vcpu)66 static inline int kvm_xen_has_interrupt(struct kvm_vcpu *vcpu)
67 {
68 	if (static_branch_unlikely(&kvm_xen_enabled.key) &&
69 	    vcpu->arch.xen.vcpu_info_cache.active &&
70 	    vcpu->kvm->arch.xen.upcall_vector)
71 		return __kvm_xen_has_interrupt(vcpu);
72 
73 	return 0;
74 }
75 
kvm_xen_has_pending_events(struct kvm_vcpu * vcpu)76 static inline bool kvm_xen_has_pending_events(struct kvm_vcpu *vcpu)
77 {
78 	return static_branch_unlikely(&kvm_xen_enabled.key) &&
79 		vcpu->arch.xen.evtchn_pending_sel;
80 }
81 
kvm_xen_timer_enabled(struct kvm_vcpu * vcpu)82 static inline bool kvm_xen_timer_enabled(struct kvm_vcpu *vcpu)
83 {
84 	return !!vcpu->arch.xen.timer_virq;
85 }
86 
kvm_xen_has_pending_timer(struct kvm_vcpu * vcpu)87 static inline int kvm_xen_has_pending_timer(struct kvm_vcpu *vcpu)
88 {
89 	if (kvm_xen_hypercall_enabled(vcpu->kvm) && kvm_xen_timer_enabled(vcpu))
90 		return atomic_read(&vcpu->arch.xen.timer_pending);
91 
92 	return 0;
93 }
94 
95 void kvm_xen_inject_timer_irqs(struct kvm_vcpu *vcpu);
96 #else
kvm_xen_write_hypercall_page(struct kvm_vcpu * vcpu,u64 data)97 static inline int kvm_xen_write_hypercall_page(struct kvm_vcpu *vcpu, u64 data)
98 {
99 	return 1;
100 }
101 
kvm_xen_init_vm(struct kvm * kvm)102 static inline void kvm_xen_init_vm(struct kvm *kvm)
103 {
104 }
105 
kvm_xen_destroy_vm(struct kvm * kvm)106 static inline void kvm_xen_destroy_vm(struct kvm *kvm)
107 {
108 }
109 
kvm_xen_init_vcpu(struct kvm_vcpu * vcpu)110 static inline void kvm_xen_init_vcpu(struct kvm_vcpu *vcpu)
111 {
112 }
113 
kvm_xen_destroy_vcpu(struct kvm_vcpu * vcpu)114 static inline void kvm_xen_destroy_vcpu(struct kvm_vcpu *vcpu)
115 {
116 }
117 
kvm_xen_sw_enable_lapic(struct kvm_vcpu * vcpu)118 static inline void kvm_xen_sw_enable_lapic(struct kvm_vcpu *vcpu)
119 {
120 }
121 
kvm_xen_msr_enabled(struct kvm * kvm)122 static inline bool kvm_xen_msr_enabled(struct kvm *kvm)
123 {
124 	return false;
125 }
126 
kvm_xen_hypercall_enabled(struct kvm * kvm)127 static inline bool kvm_xen_hypercall_enabled(struct kvm *kvm)
128 {
129 	return false;
130 }
131 
kvm_xen_has_interrupt(struct kvm_vcpu * vcpu)132 static inline int kvm_xen_has_interrupt(struct kvm_vcpu *vcpu)
133 {
134 	return 0;
135 }
136 
kvm_xen_inject_pending_events(struct kvm_vcpu * vcpu)137 static inline void kvm_xen_inject_pending_events(struct kvm_vcpu *vcpu)
138 {
139 }
140 
kvm_xen_has_pending_events(struct kvm_vcpu * vcpu)141 static inline bool kvm_xen_has_pending_events(struct kvm_vcpu *vcpu)
142 {
143 	return false;
144 }
145 
kvm_xen_has_pending_timer(struct kvm_vcpu * vcpu)146 static inline int kvm_xen_has_pending_timer(struct kvm_vcpu *vcpu)
147 {
148 	return 0;
149 }
150 
kvm_xen_inject_timer_irqs(struct kvm_vcpu * vcpu)151 static inline void kvm_xen_inject_timer_irqs(struct kvm_vcpu *vcpu)
152 {
153 }
154 
kvm_xen_timer_enabled(struct kvm_vcpu * vcpu)155 static inline bool kvm_xen_timer_enabled(struct kvm_vcpu *vcpu)
156 {
157 	return false;
158 }
159 
kvm_xen_update_tsc_info(struct kvm_vcpu * vcpu)160 static inline void kvm_xen_update_tsc_info(struct kvm_vcpu *vcpu)
161 {
162 }
163 #endif
164 
165 int kvm_xen_hypercall(struct kvm_vcpu *vcpu);
166 
167 #include <asm/pvclock-abi.h>
168 #include <asm/xen/interface.h>
169 #include <xen/interface/vcpu.h>
170 
171 void kvm_xen_update_runstate(struct kvm_vcpu *vcpu, int state);
172 
kvm_xen_runstate_set_running(struct kvm_vcpu * vcpu)173 static inline void kvm_xen_runstate_set_running(struct kvm_vcpu *vcpu)
174 {
175 	kvm_xen_update_runstate(vcpu, RUNSTATE_running);
176 }
177 
kvm_xen_runstate_set_preempted(struct kvm_vcpu * vcpu)178 static inline void kvm_xen_runstate_set_preempted(struct kvm_vcpu *vcpu)
179 {
180 	/*
181 	 * If the vCPU wasn't preempted but took a normal exit for
182 	 * some reason (hypercalls, I/O, etc.), that is accounted as
183 	 * still RUNSTATE_running, as the VMM is still operating on
184 	 * behalf of the vCPU. Only if the VMM does actually block
185 	 * does it need to enter RUNSTATE_blocked.
186 	 */
187 	if (WARN_ON_ONCE(!vcpu->preempted))
188 		return;
189 
190 	kvm_xen_update_runstate(vcpu, RUNSTATE_runnable);
191 }
192 
193 /* 32-bit compatibility definitions, also used natively in 32-bit build */
194 struct compat_arch_vcpu_info {
195 	unsigned int cr2;
196 	unsigned int pad[5];
197 };
198 
199 struct compat_vcpu_info {
200 	uint8_t evtchn_upcall_pending;
201 	uint8_t evtchn_upcall_mask;
202 	uint16_t pad;
203 	uint32_t evtchn_pending_sel;
204 	struct compat_arch_vcpu_info arch;
205 	struct pvclock_vcpu_time_info time;
206 }; /* 64 bytes (x86) */
207 
208 struct compat_arch_shared_info {
209 	unsigned int max_pfn;
210 	unsigned int pfn_to_mfn_frame_list_list;
211 	unsigned int nmi_reason;
212 	unsigned int p2m_cr3;
213 	unsigned int p2m_vaddr;
214 	unsigned int p2m_generation;
215 	uint32_t wc_sec_hi;
216 };
217 
218 struct compat_shared_info {
219 	struct compat_vcpu_info vcpu_info[MAX_VIRT_CPUS];
220 	uint32_t evtchn_pending[32];
221 	uint32_t evtchn_mask[32];
222 	struct pvclock_wall_clock wc;
223 	struct compat_arch_shared_info arch;
224 };
225 
226 #define COMPAT_EVTCHN_2L_NR_CHANNELS (8 *				\
227 				      sizeof_field(struct compat_shared_info, \
228 						   evtchn_pending))
229 struct compat_vcpu_runstate_info {
230     int state;
231     uint64_t state_entry_time;
232     uint64_t time[4];
233 } __attribute__((packed));
234 
235 struct compat_sched_poll {
236 	/* This is actually a guest virtual address which points to ports. */
237 	uint32_t ports;
238 	unsigned int nr_ports;
239 	uint64_t timeout;
240 };
241 
242 #endif /* __ARCH_X86_KVM_XEN_H__ */
243