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1/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
2/*
3 * Userspace interfaces for /dev/mshv* devices and derived fds
4 *
5 * This file is divided into sections containing data structures and IOCTLs for
6 * a particular set of related devices or derived file descriptors.
7 *
8 * The IOCTL definitions are at the end of each section. They are grouped by
9 * device/fd, so that new IOCTLs can easily be added with a monotonically
10 * increasing number.
11 */
12#ifndef _UAPI_LINUX_MSHV_H
13#define _UAPI_LINUX_MSHV_H
14
15#include <linux/types.h>
16
17#define MSHV_IOCTL 0xB8
18
19/*
20 *******************************************
21 * Entry point to main VMM APIs: /dev/mshv *
22 *******************************************
23 */
24
25enum {
26 MSHV_PT_BIT_LAPIC,
27 MSHV_PT_BIT_X2APIC,
28 MSHV_PT_BIT_GPA_SUPER_PAGES,
29 MSHV_PT_BIT_CPU_AND_XSAVE_FEATURES,
30 MSHV_PT_BIT_COUNT,
31};
32
33#define MSHV_PT_FLAGS_MASK ((1 << MSHV_PT_BIT_COUNT) - 1)
34
35enum {
36 MSHV_PT_ISOLATION_NONE,
37 MSHV_PT_ISOLATION_COUNT,
38};
39
40/**
41 * struct mshv_create_partition - arguments for MSHV_CREATE_PARTITION
42 * @pt_flags: Bitmask of 1 << MSHV_PT_BIT_*
43 * @pt_isolation: MSHV_PT_ISOLATION_*
44 *
45 * This is the initial/v1 version for backward compatibility.
46 *
47 * Returns a file descriptor to act as a handle to a guest partition.
48 * At this point the partition is not yet initialized in the hypervisor.
49 * Some operations must be done with the partition in this state, e.g. setting
50 * so-called "early" partition properties. The partition can then be
51 * initialized with MSHV_INITIALIZE_PARTITION.
52 */
53struct mshv_create_partition {
54 __u64 pt_flags;
55 __u64 pt_isolation;
56};
57
58#define MSHV_NUM_CPU_FEATURES_BANKS 2
59
60/**
61 * struct mshv_create_partition_v2
62 *
63 * This is extended version of the above initial MSHV_CREATE_PARTITION
64 * ioctl and allows for following additional parameters:
65 *
66 * @pt_num_cpu_fbanks: Must be set to MSHV_NUM_CPU_FEATURES_BANKS.
67 * @pt_cpu_fbanks: Disabled processor feature banks array.
68 * @pt_disabled_xsave: Disabled xsave feature bits.
69 *
70 * pt_cpu_fbanks and pt_disabled_xsave are passed through as-is to the create
71 * partition hypercall.
72 *
73 * Returns : same as above original mshv_create_partition
74 */
75struct mshv_create_partition_v2 {
76 __u64 pt_flags;
77 __u64 pt_isolation;
78 __u16 pt_num_cpu_fbanks;
79 __u8 pt_rsvd[6]; /* MBZ */
80 __u64 pt_cpu_fbanks[MSHV_NUM_CPU_FEATURES_BANKS];
81 __u64 pt_rsvd1[2]; /* MBZ */
82#if defined(__x86_64__)
83 __u64 pt_disabled_xsave;
84#else
85 __u64 pt_rsvd2; /* MBZ */
86#endif
87} __packed;
88
89/* /dev/mshv */
90#define MSHV_CREATE_PARTITION _IOW(MSHV_IOCTL, 0x00, struct mshv_create_partition)
91
92/*
93 ************************
94 * Child partition APIs *
95 ************************
96 */
97
98struct mshv_create_vp {
99 __u32 vp_index;
100};
101
102enum {
103 MSHV_SET_MEM_BIT_WRITABLE,
104 MSHV_SET_MEM_BIT_EXECUTABLE,
105 MSHV_SET_MEM_BIT_UNMAP,
106 MSHV_SET_MEM_BIT_COUNT
107};
108
109#define MSHV_SET_MEM_FLAGS_MASK ((1 << MSHV_SET_MEM_BIT_COUNT) - 1)
110
111/* The hypervisor's "native" page size */
112#define MSHV_HV_PAGE_SIZE 0x1000
113
114/**
115 * struct mshv_user_mem_region - arguments for MSHV_SET_GUEST_MEMORY
116 * @size: Size of the memory region (bytes). Must be aligned to
117 * MSHV_HV_PAGE_SIZE
118 * @guest_pfn: Base guest page number to map
119 * @userspace_addr: Base address of userspace memory. Must be aligned to
120 * MSHV_HV_PAGE_SIZE
121 * @flags: Bitmask of 1 << MSHV_SET_MEM_BIT_*. If (1 << MSHV_SET_MEM_BIT_UNMAP)
122 * is set, ignore other bits.
123 * @rsvd: MBZ
124 *
125 * Map or unmap a region of userspace memory to Guest Physical Addresses (GPA).
126 * Mappings can't overlap in GPA space.
127 * To unmap, these fields must match an existing mapping.
128 */
129struct mshv_user_mem_region {
130 __u64 size;
131 __u64 guest_pfn;
132 __u64 userspace_addr;
133 __u8 flags;
134 __u8 rsvd[7];
135};
136
137enum {
138 MSHV_IRQFD_BIT_DEASSIGN,
139 MSHV_IRQFD_BIT_RESAMPLE,
140 MSHV_IRQFD_BIT_COUNT,
141};
142
143#define MSHV_IRQFD_FLAGS_MASK ((1 << MSHV_IRQFD_BIT_COUNT) - 1)
144
145struct mshv_user_irqfd {
146 __s32 fd;
147 __s32 resamplefd;
148 __u32 gsi;
149 __u32 flags;
150};
151
152enum {
153 MSHV_IOEVENTFD_BIT_DATAMATCH,
154 MSHV_IOEVENTFD_BIT_PIO,
155 MSHV_IOEVENTFD_BIT_DEASSIGN,
156 MSHV_IOEVENTFD_BIT_COUNT,
157};
158
159#define MSHV_IOEVENTFD_FLAGS_MASK ((1 << MSHV_IOEVENTFD_BIT_COUNT) - 1)
160
161struct mshv_user_ioeventfd {
162 __u64 datamatch;
163 __u64 addr; /* legal pio/mmio address */
164 __u32 len; /* 1, 2, 4, or 8 bytes */
165 __s32 fd;
166 __u32 flags;
167 __u8 rsvd[4];
168};
169
170struct mshv_user_irq_entry {
171 __u32 gsi;
172 __u32 address_lo;
173 __u32 address_hi;
174 __u32 data;
175};
176
177struct mshv_user_irq_table {
178 __u32 nr;
179 __u32 rsvd; /* MBZ */
180 struct mshv_user_irq_entry entries[];
181};
182
183enum {
184 MSHV_GPAP_ACCESS_TYPE_ACCESSED,
185 MSHV_GPAP_ACCESS_TYPE_DIRTY,
186 MSHV_GPAP_ACCESS_TYPE_COUNT /* Count of enum members */
187};
188
189enum {
190 MSHV_GPAP_ACCESS_OP_NOOP,
191 MSHV_GPAP_ACCESS_OP_CLEAR,
192 MSHV_GPAP_ACCESS_OP_SET,
193 MSHV_GPAP_ACCESS_OP_COUNT /* Count of enum members */
194};
195
196/**
197 * struct mshv_gpap_access_bitmap - arguments for MSHV_GET_GPAP_ACCESS_BITMAP
198 * @access_type: MSHV_GPAP_ACCESS_TYPE_* - The type of access to record in the
199 * bitmap
200 * @access_op: MSHV_GPAP_ACCESS_OP_* - Allows an optional clear or set of all
201 * the access states in the range, after retrieving the current
202 * states.
203 * @rsvd: MBZ
204 * @page_count: Number of pages
205 * @gpap_base: Base gpa page number
206 * @bitmap_ptr: Output buffer for bitmap, at least (page_count + 7) / 8 bytes
207 *
208 * Retrieve a bitmap of either ACCESSED or DIRTY bits for a given range of guest
209 * memory, and optionally clear or set the bits.
210 */
211struct mshv_gpap_access_bitmap {
212 __u8 access_type;
213 __u8 access_op;
214 __u8 rsvd[6];
215 __u64 page_count;
216 __u64 gpap_base;
217 __u64 bitmap_ptr;
218};
219
220/**
221 * struct mshv_root_hvcall - arguments for MSHV_ROOT_HVCALL
222 * @code: Hypercall code (HVCALL_*)
223 * @reps: in: Rep count ('repcount')
224 * out: Reps completed ('repcomp'). MBZ unless rep hvcall
225 * @in_sz: Size of input incl rep data. <= MSHV_HV_PAGE_SIZE
226 * @out_sz: Size of output buffer. <= MSHV_HV_PAGE_SIZE. MBZ if out_ptr is 0
227 * @status: in: MBZ
228 * out: HV_STATUS_* from hypercall
229 * @rsvd: MBZ
230 * @in_ptr: Input data buffer (struct hv_input_*). If used with partition or
231 * vp fd, partition id field is populated by kernel.
232 * @out_ptr: Output data buffer (optional)
233 */
234struct mshv_root_hvcall {
235 __u16 code;
236 __u16 reps;
237 __u16 in_sz;
238 __u16 out_sz;
239 __u16 status;
240 __u8 rsvd[6];
241 __u64 in_ptr;
242 __u64 out_ptr;
243};
244
245/* Partition fds created with MSHV_CREATE_PARTITION */
246#define MSHV_INITIALIZE_PARTITION _IO(MSHV_IOCTL, 0x00)
247#define MSHV_CREATE_VP _IOW(MSHV_IOCTL, 0x01, struct mshv_create_vp)
248#define MSHV_SET_GUEST_MEMORY _IOW(MSHV_IOCTL, 0x02, struct mshv_user_mem_region)
249#define MSHV_IRQFD _IOW(MSHV_IOCTL, 0x03, struct mshv_user_irqfd)
250#define MSHV_IOEVENTFD _IOW(MSHV_IOCTL, 0x04, struct mshv_user_ioeventfd)
251#define MSHV_SET_MSI_ROUTING _IOW(MSHV_IOCTL, 0x05, struct mshv_user_irq_table)
252#define MSHV_GET_GPAP_ACCESS_BITMAP _IOWR(MSHV_IOCTL, 0x06, struct mshv_gpap_access_bitmap)
253/* Generic hypercall */
254#define MSHV_ROOT_HVCALL _IOWR(MSHV_IOCTL, 0x07, struct mshv_root_hvcall)
255
256/*
257 ********************************
258 * VP APIs for child partitions *
259 ********************************
260 */
261
262#define MSHV_RUN_VP_BUF_SZ 256
263
264/*
265 * VP state pages may be mapped to userspace via mmap().
266 * To specify which state page, use MSHV_VP_MMAP_OFFSET_ values multiplied by
267 * the system page size.
268 * e.g.
269 * long page_size = sysconf(_SC_PAGE_SIZE);
270 * void *reg_page = mmap(NULL, MSHV_HV_PAGE_SIZE, PROT_READ|PROT_WRITE,
271 * MAP_SHARED, vp_fd,
272 * MSHV_VP_MMAP_OFFSET_REGISTERS * page_size);
273 */
274enum {
275 MSHV_VP_MMAP_OFFSET_REGISTERS,
276 MSHV_VP_MMAP_OFFSET_INTERCEPT_MESSAGE,
277 MSHV_VP_MMAP_OFFSET_GHCB,
278 MSHV_VP_MMAP_OFFSET_COUNT
279};
280
281/**
282 * struct mshv_run_vp - argument for MSHV_RUN_VP
283 * @msg_buf: On success, the intercept message is copied here. It can be
284 * interpreted using the relevant hypervisor definitions.
285 */
286struct mshv_run_vp {
287 __u8 msg_buf[MSHV_RUN_VP_BUF_SZ];
288};
289
290enum {
291 MSHV_VP_STATE_LAPIC, /* Local interrupt controller state (either arch) */
292 MSHV_VP_STATE_XSAVE, /* XSAVE data in compacted form (x86_64) */
293 MSHV_VP_STATE_SIMP,
294 MSHV_VP_STATE_SIEFP,
295 MSHV_VP_STATE_SYNTHETIC_TIMERS,
296 MSHV_VP_STATE_COUNT,
297};
298
299/**
300 * struct mshv_get_set_vp_state - arguments for MSHV_[GET,SET]_VP_STATE
301 * @type: MSHV_VP_STATE_*
302 * @rsvd: MBZ
303 * @buf_sz: in: 4k page-aligned size of buffer
304 * out: Actual size of data (on EINVAL, check this to see if buffer
305 * was too small)
306 * @buf_ptr: 4k page-aligned data buffer
307 */
308struct mshv_get_set_vp_state {
309 __u8 type;
310 __u8 rsvd[3];
311 __u32 buf_sz;
312 __u64 buf_ptr;
313};
314
315/* VP fds created with MSHV_CREATE_VP */
316#define MSHV_RUN_VP _IOR(MSHV_IOCTL, 0x00, struct mshv_run_vp)
317#define MSHV_GET_VP_STATE _IOWR(MSHV_IOCTL, 0x01, struct mshv_get_set_vp_state)
318#define MSHV_SET_VP_STATE _IOWR(MSHV_IOCTL, 0x02, struct mshv_get_set_vp_state)
319/*
320 * Generic hypercall
321 * Defined above in partition IOCTLs, avoid redefining it here
322 * #define MSHV_ROOT_HVCALL _IOWR(MSHV_IOCTL, 0x07, struct mshv_root_hvcall)
323 */
324
325/* Structure definitions, macros and IOCTLs for mshv_vtl */
326
327#define MSHV_CAP_CORE_API_STABLE 0x0
328#define MSHV_CAP_REGISTER_PAGE 0x1
329#define MSHV_CAP_VTL_RETURN_ACTION 0x2
330#define MSHV_CAP_DR6_SHARED 0x3
331#define MSHV_MAX_RUN_MSG_SIZE 256
332
333struct mshv_vp_registers {
334 __u32 count; /* supports only 1 register at a time */
335 __u32 reserved; /* Reserved for alignment or future use */
336 __u64 regs_ptr; /* pointer to struct hv_register_assoc */
337};
338
339struct mshv_vtl_set_eventfd {
340 __s32 fd;
341 __u32 flag;
342};
343
344struct mshv_vtl_signal_event {
345 __u32 connection_id;
346 __u32 flag;
347};
348
349struct mshv_vtl_sint_post_msg {
350 __u64 message_type;
351 __u32 connection_id;
352 __u32 payload_size; /* Must not exceed HV_MESSAGE_PAYLOAD_BYTE_COUNT */
353 __u64 payload_ptr; /* pointer to message payload (bytes) */
354};
355
356struct mshv_vtl_ram_disposition {
357 __u64 start_pfn;
358 __u64 last_pfn;
359};
360
361struct mshv_vtl_set_poll_file {
362 __u32 cpu;
363 __u32 fd;
364};
365
366struct mshv_vtl_hvcall_setup {
367 __u64 bitmap_array_size; /* stores number of bytes */
368 __u64 allow_bitmap_ptr;
369};
370
371struct mshv_vtl_hvcall {
372 __u64 control; /* Hypercall control code */
373 __u64 input_size; /* Size of the input data */
374 __u64 input_ptr; /* Pointer to the input struct */
375 __u64 status; /* Status of the hypercall (output) */
376 __u64 output_size; /* Size of the output data */
377 __u64 output_ptr; /* Pointer to the output struct */
378};
379
380struct mshv_sint_mask {
381 __u8 mask;
382 __u8 reserved[7];
383};
384
385/* /dev/mshv device IOCTL */
386#define MSHV_CHECK_EXTENSION _IOW(MSHV_IOCTL, 0x00, __u32)
387
388/* vtl device */
389#define MSHV_CREATE_VTL _IOR(MSHV_IOCTL, 0x1D, char)
390#define MSHV_ADD_VTL0_MEMORY _IOW(MSHV_IOCTL, 0x21, struct mshv_vtl_ram_disposition)
391#define MSHV_SET_POLL_FILE _IOW(MSHV_IOCTL, 0x25, struct mshv_vtl_set_poll_file)
392#define MSHV_RETURN_TO_LOWER_VTL _IO(MSHV_IOCTL, 0x27)
393#define MSHV_GET_VP_REGISTERS _IOWR(MSHV_IOCTL, 0x05, struct mshv_vp_registers)
394#define MSHV_SET_VP_REGISTERS _IOW(MSHV_IOCTL, 0x06, struct mshv_vp_registers)
395
396/* VMBus device IOCTLs */
397#define MSHV_SINT_SIGNAL_EVENT _IOW(MSHV_IOCTL, 0x22, struct mshv_vtl_signal_event)
398#define MSHV_SINT_POST_MESSAGE _IOW(MSHV_IOCTL, 0x23, struct mshv_vtl_sint_post_msg)
399#define MSHV_SINT_SET_EVENTFD _IOW(MSHV_IOCTL, 0x24, struct mshv_vtl_set_eventfd)
400#define MSHV_SINT_PAUSE_MESSAGE_STREAM _IOW(MSHV_IOCTL, 0x25, struct mshv_sint_mask)
401
402/* hv_hvcall device */
403#define MSHV_HVCALL_SETUP _IOW(MSHV_IOCTL, 0x1E, struct mshv_vtl_hvcall_setup)
404#define MSHV_HVCALL _IOWR(MSHV_IOCTL, 0x1F, struct mshv_vtl_hvcall)
405#endif