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1 /*
2  * QEMU KVM support
3  *
4  * Copyright IBM, Corp. 2008
5  *
6  * Authors:
7  *  Anthony Liguori   <[email protected]>
8  *
9  * This work is licensed under the terms of the GNU GPL, version 2 or later.
10  * See the COPYING file in the top-level directory.
11  *
12  */
13
14 #ifndef QEMU_KVM_H
15 #define QEMU_KVM_H
16
17 #include <errno.h>
18 #include "config-host.h"
19 #include "qemu/queue.h"
20 #include "qom/cpu.h"
21
22 #ifdef CONFIG_KVM
23 #include <linux/kvm.h>
24 #include <linux/kvm_para.h>
25 #else
26 /* These constants must never be used at runtime if kvm_enabled() is false.
27  * They exist so we don't need #ifdefs around KVM-specific code that already
28  * checks kvm_enabled() properly.
29  */
30 #define KVM_CPUID_SIGNATURE      0
31 #define KVM_CPUID_FEATURES       0
32 #define KVM_FEATURE_CLOCKSOURCE  0
33 #define KVM_FEATURE_NOP_IO_DELAY 0
34 #define KVM_FEATURE_MMU_OP       0
35 #define KVM_FEATURE_CLOCKSOURCE2 0
36 #define KVM_FEATURE_ASYNC_PF     0
37 #define KVM_FEATURE_STEAL_TIME   0
38 #define KVM_FEATURE_PV_EOI       0
39 #define KVM_FEATURE_CLOCKSOURCE_STABLE_BIT 0
40 #endif
41
42 extern bool kvm_allowed;
43 extern bool kvm_kernel_irqchip;
44 extern bool kvm_async_interrupts_allowed;
45 extern bool kvm_halt_in_kernel_allowed;
46 extern bool kvm_eventfds_allowed;
47 extern bool kvm_irqfds_allowed;
48 extern bool kvm_resamplefds_allowed;
49 extern bool kvm_msi_via_irqfd_allowed;
50 extern bool kvm_gsi_routing_allowed;
51 extern bool kvm_gsi_direct_mapping;
52 extern bool kvm_readonly_mem_allowed;
53
54 #if defined CONFIG_KVM || !defined NEED_CPU_H
55 #define kvm_enabled()           (kvm_allowed)
56 /**
57  * kvm_irqchip_in_kernel:
58  *
59  * Returns: true if the user asked us to create an in-kernel
60  * irqchip via the "kernel_irqchip=on" machine option.
61  * What this actually means is architecture and machine model
62  * specific: on PC, for instance, it means that the LAPIC,
63  * IOAPIC and PIT are all in kernel. This function should never
64  * be used from generic target-independent code: use one of the
65  * following functions or some other specific check instead.
66  */
67 #define kvm_irqchip_in_kernel() (kvm_kernel_irqchip)
68
69 /**
70  * kvm_async_interrupts_enabled:
71  *
72  * Returns: true if we can deliver interrupts to KVM
73  * asynchronously (ie by ioctl from any thread at any time)
74  * rather than having to do interrupt delivery synchronously
75  * (where the vcpu must be stopped at a suitable point first).
76  */
77 #define kvm_async_interrupts_enabled() (kvm_async_interrupts_allowed)
78
79 /**
80  * kvm_halt_in_kernel
81  *
82  * Returns: true if halted cpus should still get a KVM_RUN ioctl to run
83  * inside of kernel space. This only works if MP state is implemented.
84  */
85 #define kvm_halt_in_kernel() (kvm_halt_in_kernel_allowed)
86
87 /**
88  * kvm_eventfds_enabled:
89  *
90  * Returns: true if we can use eventfds to receive notifications
91  * from a KVM CPU (ie the kernel supports eventds and we are running
92  * with a configuration where it is meaningful to use them).
93  */
94 #define kvm_eventfds_enabled() (kvm_eventfds_allowed)
95
96 /**
97  * kvm_irqfds_enabled:
98  *
99  * Returns: true if we can use irqfds to inject interrupts into
100  * a KVM CPU (ie the kernel supports irqfds and we are running
101  * with a configuration where it is meaningful to use them).
102  */
103 #define kvm_irqfds_enabled() (kvm_irqfds_allowed)
104
105 /**
106  * kvm_resamplefds_enabled:
107  *
108  * Returns: true if we can use resamplefds to inject interrupts into
109  * a KVM CPU (ie the kernel supports resamplefds and we are running
110  * with a configuration where it is meaningful to use them).
111  */
112 #define kvm_resamplefds_enabled() (kvm_resamplefds_allowed)
113
114 /**
115  * kvm_msi_via_irqfd_enabled:
116  *
117  * Returns: true if we can route a PCI MSI (Message Signaled Interrupt)
118  * to a KVM CPU via an irqfd. This requires that the kernel supports
119  * this and that we're running in a configuration that permits it.
120  */
121 #define kvm_msi_via_irqfd_enabled() (kvm_msi_via_irqfd_allowed)
122
123 /**
124  * kvm_gsi_routing_enabled:
125  *
126  * Returns: true if GSI routing is enabled (ie the kernel supports
127  * it and we're running in a configuration that permits it).
128  */
129 #define kvm_gsi_routing_enabled() (kvm_gsi_routing_allowed)
130
131 /**
132  * kvm_gsi_direct_mapping:
133  *
134  * Returns: true if GSI direct mapping is enabled.
135  */
136 #define kvm_gsi_direct_mapping() (kvm_gsi_direct_mapping)
137
138 /**
139  * kvm_readonly_mem_enabled:
140  *
141  * Returns: true if KVM readonly memory is enabled (ie the kernel
142  * supports it and we're running in a configuration that permits it).
143  */
144 #define kvm_readonly_mem_enabled() (kvm_readonly_mem_allowed)
145
146 #else
147 #define kvm_enabled()           (0)
148 #define kvm_irqchip_in_kernel() (false)
149 #define kvm_async_interrupts_enabled() (false)
150 #define kvm_halt_in_kernel() (false)
151 #define kvm_eventfds_enabled() (false)
152 #define kvm_irqfds_enabled() (false)
153 #define kvm_msi_via_irqfd_enabled() (false)
154 #define kvm_gsi_routing_allowed() (false)
155 #define kvm_gsi_direct_mapping() (false)
156 #define kvm_readonly_mem_enabled() (false)
157 #endif
158
159 struct kvm_run;
160 struct kvm_lapic_state;
161 struct kvm_irq_routing_entry;
162
163 typedef struct KVMCapabilityInfo {
164     const char *name;
165     int value;
166 } KVMCapabilityInfo;
167
168 #define KVM_CAP_INFO(CAP) { "KVM_CAP_" stringify(CAP), KVM_CAP_##CAP }
169 #define KVM_CAP_LAST_INFO { NULL, 0 }
170
171 struct KVMState;
172 typedef struct KVMState KVMState;
173 extern KVMState *kvm_state;
174
175 /* external API */
176
177 bool kvm_has_free_slot(MachineState *ms);
178 int kvm_has_sync_mmu(void);
179 int kvm_has_vcpu_events(void);
180 int kvm_has_robust_singlestep(void);
181 int kvm_has_debugregs(void);
182 int kvm_has_xsave(void);
183 int kvm_has_xcrs(void);
184 int kvm_has_pit_state2(void);
185 int kvm_has_many_ioeventfds(void);
186 int kvm_has_gsi_routing(void);
187 int kvm_has_intx_set_mask(void);
188
189 int kvm_init_vcpu(CPUState *cpu);
190 int kvm_cpu_exec(CPUState *cpu);
191
192 #ifdef NEED_CPU_H
193
194 void kvm_setup_guest_memory(void *start, size_t size);
195 void kvm_flush_coalesced_mmio_buffer(void);
196
197 int kvm_insert_breakpoint(CPUState *cpu, target_ulong addr,
198                           target_ulong len, int type);
199 int kvm_remove_breakpoint(CPUState *cpu, target_ulong addr,
200                           target_ulong len, int type);
201 void kvm_remove_all_breakpoints(CPUState *cpu);
202 int kvm_update_guest_debug(CPUState *cpu, unsigned long reinject_trap);
203 #ifndef _WIN32
204 int kvm_set_signal_mask(CPUState *cpu, const sigset_t *sigset);
205 #endif
206
207 int kvm_on_sigbus_vcpu(CPUState *cpu, int code, void *addr);
208 int kvm_on_sigbus(int code, void *addr);
209
210 /* internal API */
211
212 int kvm_ioctl(KVMState *s, int type, ...);
213
214 int kvm_vm_ioctl(KVMState *s, int type, ...);
215
216 int kvm_vcpu_ioctl(CPUState *cpu, int type, ...);
217
218 /**
219  * kvm_device_ioctl - call an ioctl on a kvm device
220  * @fd: The KVM device file descriptor as returned from KVM_CREATE_DEVICE
221  * @type: The device-ctrl ioctl number
222  *
223  * Returns: -errno on error, nonnegative on success
224  */
225 int kvm_device_ioctl(int fd, int type, ...);
226
227 /**
228  * kvm_create_device - create a KVM device for the device control API
229  * @KVMState: The KVMState pointer
230  * @type: The KVM device type (see Documentation/virtual/kvm/devices in the
231  *        kernel source)
232  * @test: If true, only test if device can be created, but don't actually
233  *        create the device.
234  *
235  * Returns: -errno on error, nonnegative on success: @test ? 0 : device fd;
236  */
237 int kvm_create_device(KVMState *s, uint64_t type, bool test);
238
239
240 /* Arch specific hooks */
241
242 extern const KVMCapabilityInfo kvm_arch_required_capabilities[];
243
244 void kvm_arch_pre_run(CPUState *cpu, struct kvm_run *run);
245 void kvm_arch_post_run(CPUState *cpu, struct kvm_run *run);
246
247 int kvm_arch_handle_exit(CPUState *cpu, struct kvm_run *run);
248
249 int kvm_arch_process_async_events(CPUState *cpu);
250
251 int kvm_arch_get_registers(CPUState *cpu);
252
253 /* state subset only touched by the VCPU itself during runtime */
254 #define KVM_PUT_RUNTIME_STATE   1
255 /* state subset modified during VCPU reset */
256 #define KVM_PUT_RESET_STATE     2
257 /* full state set, modified during initialization or on vmload */
258 #define KVM_PUT_FULL_STATE      3
259
260 int kvm_arch_put_registers(CPUState *cpu, int level);
261
262 int kvm_arch_init(MachineState *ms, KVMState *s);
263
264 int kvm_arch_init_vcpu(CPUState *cpu);
265
266 /* Returns VCPU ID to be used on KVM_CREATE_VCPU ioctl() */
267 unsigned long kvm_arch_vcpu_id(CPUState *cpu);
268
269 int kvm_arch_on_sigbus_vcpu(CPUState *cpu, int code, void *addr);
270 int kvm_arch_on_sigbus(int code, void *addr);
271
272 void kvm_arch_init_irq_routing(KVMState *s);
273
274 int kvm_arch_fixup_msi_route(struct kvm_irq_routing_entry *route,
275                              uint64_t address, uint32_t data);
276
277 int kvm_set_irq(KVMState *s, int irq, int level);
278 int kvm_irqchip_send_msi(KVMState *s, MSIMessage msg);
279
280 void kvm_irqchip_add_irq_route(KVMState *s, int gsi, int irqchip, int pin);
281 void kvm_irqchip_commit_routes(KVMState *s);
282
283 void kvm_put_apic_state(DeviceState *d, struct kvm_lapic_state *kapic);
284 void kvm_get_apic_state(DeviceState *d, struct kvm_lapic_state *kapic);
285
286 struct kvm_guest_debug;
287 struct kvm_debug_exit_arch;
288
289 struct kvm_sw_breakpoint {
290     target_ulong pc;
291     target_ulong saved_insn;
292     int use_count;
293     QTAILQ_ENTRY(kvm_sw_breakpoint) entry;
294 };
295
296 QTAILQ_HEAD(kvm_sw_breakpoint_head, kvm_sw_breakpoint);
297
298 struct kvm_sw_breakpoint *kvm_find_sw_breakpoint(CPUState *cpu,
299                                                  target_ulong pc);
300
301 int kvm_sw_breakpoints_active(CPUState *cpu);
302
303 int kvm_arch_insert_sw_breakpoint(CPUState *cpu,
304                                   struct kvm_sw_breakpoint *bp);
305 int kvm_arch_remove_sw_breakpoint(CPUState *cpu,
306                                   struct kvm_sw_breakpoint *bp);
307 int kvm_arch_insert_hw_breakpoint(target_ulong addr,
308                                   target_ulong len, int type);
309 int kvm_arch_remove_hw_breakpoint(target_ulong addr,
310                                   target_ulong len, int type);
311 void kvm_arch_remove_all_hw_breakpoints(void);
312
313 void kvm_arch_update_guest_debug(CPUState *cpu, struct kvm_guest_debug *dbg);
314
315 bool kvm_arch_stop_on_emulation_error(CPUState *cpu);
316
317 int kvm_check_extension(KVMState *s, unsigned int extension);
318
319 int kvm_vm_check_extension(KVMState *s, unsigned int extension);
320
321 #define kvm_vm_enable_cap(s, capability, cap_flags, ...)             \
322     ({                                                               \
323         struct kvm_enable_cap cap = {                                \
324             .cap = capability,                                       \
325             .flags = cap_flags,                                      \
326         };                                                           \
327         uint64_t args_tmp[] = { __VA_ARGS__ };                       \
328         int i;                                                       \
329         for (i = 0; i < (int)ARRAY_SIZE(args_tmp) &&                 \
330                      i < ARRAY_SIZE(cap.args); i++) {                \
331             cap.args[i] = args_tmp[i];                               \
332         }                                                            \
333         kvm_vm_ioctl(s, KVM_ENABLE_CAP, &cap);                       \
334     })
335
336 #define kvm_vcpu_enable_cap(cpu, capability, cap_flags, ...)         \
337     ({                                                               \
338         struct kvm_enable_cap cap = {                                \
339             .cap = capability,                                       \
340             .flags = cap_flags,                                      \
341         };                                                           \
342         uint64_t args_tmp[] = { __VA_ARGS__ };                       \
343         int i;                                                       \
344         for (i = 0; i < (int)ARRAY_SIZE(args_tmp) &&                 \
345                      i < ARRAY_SIZE(cap.args); i++) {                \
346             cap.args[i] = args_tmp[i];                               \
347         }                                                            \
348         kvm_vcpu_ioctl(cpu, KVM_ENABLE_CAP, &cap);                   \
349     })
350
351 uint32_t kvm_arch_get_supported_cpuid(KVMState *env, uint32_t function,
352                                       uint32_t index, int reg);
353
354 void kvm_set_sigmask_len(KVMState *s, unsigned int sigmask_len);
355
356 #if !defined(CONFIG_USER_ONLY)
357 int kvm_physical_memory_addr_from_host(KVMState *s, void *ram_addr,
358                                        hwaddr *phys_addr);
359 #endif
360
361 #endif /* NEED_CPU_H */
362
363 void kvm_cpu_synchronize_state(CPUState *cpu);
364 void kvm_cpu_synchronize_post_reset(CPUState *cpu);
365 void kvm_cpu_synchronize_post_init(CPUState *cpu);
366 void kvm_cpu_clean_state(CPUState *cpu);
367
368 /* generic hooks - to be moved/refactored once there are more users */
369
370 static inline void cpu_synchronize_state(CPUState *cpu)
371 {
372     if (kvm_enabled()) {
373         kvm_cpu_synchronize_state(cpu);
374     }
375 }
376
377 static inline void cpu_synchronize_post_reset(CPUState *cpu)
378 {
379     if (kvm_enabled()) {
380         kvm_cpu_synchronize_post_reset(cpu);
381     }
382 }
383
384 static inline void cpu_synchronize_post_init(CPUState *cpu)
385 {
386     if (kvm_enabled()) {
387         kvm_cpu_synchronize_post_init(cpu);
388     }
389 }
390
391 static inline void cpu_clean_state(CPUState *cpu)
392 {
393     if (kvm_enabled()) {
394         kvm_cpu_clean_state(cpu);
395     }
396 }
397
398 int kvm_irqchip_add_msi_route(KVMState *s, MSIMessage msg);
399 int kvm_irqchip_update_msi_route(KVMState *s, int virq, MSIMessage msg);
400 void kvm_irqchip_release_virq(KVMState *s, int virq);
401
402 int kvm_irqchip_add_adapter_route(KVMState *s, AdapterInfo *adapter);
403
404 int kvm_irqchip_add_irqfd_notifier(KVMState *s, EventNotifier *n,
405                                    EventNotifier *rn, int virq);
406 int kvm_irqchip_remove_irqfd_notifier(KVMState *s, EventNotifier *n, int virq);
407 void kvm_pc_gsi_handler(void *opaque, int n, int level);
408 void kvm_pc_setup_irq_routing(bool pci_enabled);
409 void kvm_init_irq_routing(KVMState *s);
410
411 /**
412  * kvm_arch_irqchip_create:
413  * @KVMState: The KVMState pointer
414  *
415  * Allow architectures to create an in-kernel irq chip themselves.
416  *
417  * Returns: < 0: error
418  *            0: irq chip was not created
419  *          > 0: irq chip was created
420  */
421 int kvm_arch_irqchip_create(KVMState *s);
422
423 /**
424  * kvm_set_one_reg - set a register value in KVM via KVM_SET_ONE_REG ioctl
425  * @id: The register ID
426  * @source: The pointer to the value to be set. It must point to a variable
427  *          of the correct type/size for the register being accessed.
428  *
429  * Returns: 0 on success, or a negative errno on failure.
430  */
431 int kvm_set_one_reg(CPUState *cs, uint64_t id, void *source);
432
433 /**
434  * kvm_get_one_reg - get a register value from KVM via KVM_GET_ONE_REG ioctl
435  * @id: The register ID
436  * @target: The pointer where the value is to be stored. It must point to a
437  *          variable of the correct type/size for the register being accessed.
438  *
439  * Returns: 0 on success, or a negative errno on failure.
440  */
441 int kvm_get_one_reg(CPUState *cs, uint64_t id, void *target);
442 #endif
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