1 /******************************************************************************
2 * arch-x86_32.h
3 *
4 * Guest OS interface to x86 Xen.
5 *
6 * Permission is hereby granted, free of charge, to any person obtaining a copy
7 * of this software and associated documentation files (the "Software"), to
8 * deal in the Software without restriction, including without limitation the
9 * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
10 * sell copies of the Software, and to permit persons to whom the Software is
11 * furnished to do so, subject to the following conditions:
12 *
13 * The above copyright notice and this permission notice shall be included in
14 * all copies or substantial portions of the Software.
15 *
16 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
17 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
18 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
19 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
20 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
21 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
22 * DEALINGS IN THE SOFTWARE.
23 *
24 * Copyright (c) 2004-2006, K A Fraser
25 */
26
27 #ifndef _ASM_X86_XEN_INTERFACE_H
28 #define _ASM_X86_XEN_INTERFACE_H
29
30 /*
31 * XEN_GUEST_HANDLE represents a guest pointer, when passed as a field
32 * in a struct in memory.
33 * XEN_GUEST_HANDLE_PARAM represent a guest pointer, when passed as an
34 * hypercall argument.
35 * XEN_GUEST_HANDLE_PARAM and XEN_GUEST_HANDLE are the same on X86 but
36 * they might not be on other architectures.
37 */
38 #ifdef __XEN__
39 #define __DEFINE_GUEST_HANDLE(name, type) \
40 typedef struct { type *p; } __guest_handle_ ## name
41 #else
42 #define __DEFINE_GUEST_HANDLE(name, type) \
43 typedef type * __guest_handle_ ## name
44 #endif
45
46 #define DEFINE_GUEST_HANDLE_STRUCT(name) \
47 __DEFINE_GUEST_HANDLE(name, struct name)
48 #define DEFINE_GUEST_HANDLE(name) __DEFINE_GUEST_HANDLE(name, name)
49 #define GUEST_HANDLE(name) __guest_handle_ ## name
50
51 #ifdef __XEN__
52 #if defined(__i386__)
53 #define set_xen_guest_handle(hnd, val) \
54 do { \
55 if (sizeof(hnd) == 8) \
56 *(uint64_t *)&(hnd) = 0; \
57 (hnd).p = val; \
58 } while (0)
59 #elif defined(__x86_64__)
60 #define set_xen_guest_handle(hnd, val) do { (hnd).p = val; } while (0)
61 #endif
62 #else
63 #if defined(__i386__)
64 #define set_xen_guest_handle(hnd, val) \
65 do { \
66 if (sizeof(hnd) == 8) \
67 *(uint64_t *)&(hnd) = 0; \
68 (hnd) = val; \
69 } while (0)
70 #elif defined(__x86_64__)
71 #define set_xen_guest_handle(hnd, val) do { (hnd) = val; } while (0)
72 #endif
73 #endif
74
75 #ifndef __ASSEMBLY__
76 /* Explicitly size integers that represent pfns in the public interface
77 * with Xen so that on ARM we can have one ABI that works for 32 and 64
78 * bit guests. */
79 typedef unsigned long xen_pfn_t;
80 #define PRI_xen_pfn "lx"
81 typedef unsigned long xen_ulong_t;
82 #define PRI_xen_ulong "lx"
83 typedef long xen_long_t;
84 #define PRI_xen_long "lx"
85
86 /* Guest handles for primitive C types. */
87 __DEFINE_GUEST_HANDLE(uchar, unsigned char);
88 __DEFINE_GUEST_HANDLE(uint, unsigned int);
89 DEFINE_GUEST_HANDLE(char);
90 DEFINE_GUEST_HANDLE(int);
91 DEFINE_GUEST_HANDLE(void);
92 DEFINE_GUEST_HANDLE(uint64_t);
93 DEFINE_GUEST_HANDLE(uint32_t);
94 DEFINE_GUEST_HANDLE(xen_pfn_t);
95 DEFINE_GUEST_HANDLE(xen_ulong_t);
96 #endif
97
98 #ifndef HYPERVISOR_VIRT_START
99 #define HYPERVISOR_VIRT_START mk_unsigned_long(__HYPERVISOR_VIRT_START)
100 #endif
101
102 #define MACH2PHYS_VIRT_START mk_unsigned_long(__MACH2PHYS_VIRT_START)
103 #define MACH2PHYS_VIRT_END mk_unsigned_long(__MACH2PHYS_VIRT_END)
104 #define MACH2PHYS_NR_ENTRIES ((MACH2PHYS_VIRT_END-MACH2PHYS_VIRT_START)>>__MACH2PHYS_SHIFT)
105
106 /* Maximum number of virtual CPUs in multi-processor guests. */
107 #define MAX_VIRT_CPUS 32
108
109 /*
110 * SEGMENT DESCRIPTOR TABLES
111 */
112 /*
113 * A number of GDT entries are reserved by Xen. These are not situated at the
114 * start of the GDT because some stupid OSes export hard-coded selector values
115 * in their ABI. These hard-coded values are always near the start of the GDT,
116 * so Xen places itself out of the way, at the far end of the GDT.
117 *
118 * NB The LDT is set using the MMUEXT_SET_LDT op of HYPERVISOR_mmuext_op
119 */
120 #define FIRST_RESERVED_GDT_PAGE 14
121 #define FIRST_RESERVED_GDT_BYTE (FIRST_RESERVED_GDT_PAGE * 4096)
122 #define FIRST_RESERVED_GDT_ENTRY (FIRST_RESERVED_GDT_BYTE / 8)
123
124 /*
125 * Send an array of these to HYPERVISOR_set_trap_table().
126 * Terminate the array with a sentinel entry, with traps[].address==0.
127 * The privilege level specifies which modes may enter a trap via a software
128 * interrupt. On x86/64, since rings 1 and 2 are unavailable, we allocate
129 * privilege levels as follows:
130 * Level == 0: No one may enter
131 * Level == 1: Kernel may enter
132 * Level == 2: Kernel may enter
133 * Level == 3: Everyone may enter
134 */
135 #define TI_GET_DPL(_ti) ((_ti)->flags & 3)
136 #define TI_GET_IF(_ti) ((_ti)->flags & 4)
137 #define TI_SET_DPL(_ti, _dpl) ((_ti)->flags |= (_dpl))
138 #define TI_SET_IF(_ti, _if) ((_ti)->flags |= ((!!(_if))<<2))
139
140 #ifndef __ASSEMBLY__
141 struct trap_info {
142 uint8_t vector; /* exception vector */
143 uint8_t flags; /* 0-3: privilege level; 4: clear event enable? */
144 uint16_t cs; /* code selector */
145 unsigned long address; /* code offset */
146 };
147 DEFINE_GUEST_HANDLE_STRUCT(trap_info);
148
149 struct arch_shared_info {
150 /*
151 * Number of valid entries in the p2m table(s) anchored at
152 * pfn_to_mfn_frame_list_list and/or p2m_vaddr.
153 */
154 unsigned long max_pfn;
155 /*
156 * Frame containing list of mfns containing list of mfns containing p2m.
157 * A value of 0 indicates it has not yet been set up, ~0 indicates it
158 * has been set to invalid e.g. due to the p2m being too large for the
159 * 3-level p2m tree. In this case the linear mapper p2m list anchored
160 * at p2m_vaddr is to be used.
161 */
162 xen_pfn_t pfn_to_mfn_frame_list_list;
163 unsigned long nmi_reason;
164 /*
165 * Following three fields are valid if p2m_cr3 contains a value
166 * different from 0.
167 * p2m_cr3 is the root of the address space where p2m_vaddr is valid.
168 * p2m_cr3 is in the same format as a cr3 value in the vcpu register
169 * state and holds the folded machine frame number (via xen_pfn_to_cr3)
170 * of a L3 or L4 page table.
171 * p2m_vaddr holds the virtual address of the linear p2m list. All
172 * entries in the range [0...max_pfn[ are accessible via this pointer.
173 * p2m_generation will be incremented by the guest before and after each
174 * change of the mappings of the p2m list. p2m_generation starts at 0
175 * and a value with the least significant bit set indicates that a
176 * mapping update is in progress. This allows guest external software
177 * (e.g. in Dom0) to verify that read mappings are consistent and
178 * whether they have changed since the last check.
179 * Modifying a p2m element in the linear p2m list is allowed via an
180 * atomic write only.
181 */
182 unsigned long p2m_cr3; /* cr3 value of the p2m address space */
183 unsigned long p2m_vaddr; /* virtual address of the p2m list */
184 unsigned long p2m_generation; /* generation count of p2m mapping */
185 };
186 #endif /* !__ASSEMBLY__ */
187
188 #ifdef CONFIG_X86_32
189 #include <asm/xen/interface_32.h>
190 #else
191 #include <asm/xen/interface_64.h>
192 #endif
193
194 #include <asm/pvclock-abi.h>
195
196 #ifndef __ASSEMBLY__
197 /*
198 * The following is all CPU context. Note that the fpu_ctxt block is filled
199 * in by FXSAVE if the CPU has feature FXSR; otherwise FSAVE is used.
200 *
201 * Also note that when calling DOMCTL_setvcpucontext and VCPU_initialise
202 * for HVM and PVH guests, not all information in this structure is updated:
203 *
204 * - For HVM guests, the structures read include: fpu_ctxt (if
205 * VGCT_I387_VALID is set), flags, user_regs, debugreg[*]
206 *
207 * - PVH guests are the same as HVM guests, but additionally use ctrlreg[3] to
208 * set cr3. All other fields not used should be set to 0.
209 */
210 struct vcpu_guest_context {
211 /* FPU registers come first so they can be aligned for FXSAVE/FXRSTOR. */
212 struct { char x[512]; } fpu_ctxt; /* User-level FPU registers */
213 #define VGCF_I387_VALID (1<<0)
214 #define VGCF_IN_KERNEL (1<<2)
215 #define _VGCF_i387_valid 0
216 #define VGCF_i387_valid (1<<_VGCF_i387_valid)
217 #define _VGCF_in_kernel 2
218 #define VGCF_in_kernel (1<<_VGCF_in_kernel)
219 #define _VGCF_failsafe_disables_events 3
220 #define VGCF_failsafe_disables_events (1<<_VGCF_failsafe_disables_events)
221 #define _VGCF_syscall_disables_events 4
222 #define VGCF_syscall_disables_events (1<<_VGCF_syscall_disables_events)
223 #define _VGCF_online 5
224 #define VGCF_online (1<<_VGCF_online)
225 unsigned long flags; /* VGCF_* flags */
226 struct cpu_user_regs user_regs; /* User-level CPU registers */
227 struct trap_info trap_ctxt[256]; /* Virtual IDT */
228 unsigned long ldt_base, ldt_ents; /* LDT (linear address, # ents) */
229 unsigned long gdt_frames[16], gdt_ents; /* GDT (machine frames, # ents) */
230 unsigned long kernel_ss, kernel_sp; /* Virtual TSS (only SS1/SP1) */
231 /* NB. User pagetable on x86/64 is placed in ctrlreg[1]. */
232 unsigned long ctrlreg[8]; /* CR0-CR7 (control registers) */
233 unsigned long debugreg[8]; /* DB0-DB7 (debug registers) */
234 #ifdef __i386__
235 unsigned long event_callback_cs; /* CS:EIP of event callback */
236 unsigned long event_callback_eip;
237 unsigned long failsafe_callback_cs; /* CS:EIP of failsafe callback */
238 unsigned long failsafe_callback_eip;
239 #else
240 unsigned long event_callback_eip;
241 unsigned long failsafe_callback_eip;
242 unsigned long syscall_callback_eip;
243 #endif
244 unsigned long vm_assist; /* VMASST_TYPE_* bitmap */
245 #ifdef __x86_64__
246 /* Segment base addresses. */
247 uint64_t fs_base;
248 uint64_t gs_base_kernel;
249 uint64_t gs_base_user;
250 #endif
251 };
252 DEFINE_GUEST_HANDLE_STRUCT(vcpu_guest_context);
253
254 /* AMD PMU registers and structures */
255 struct xen_pmu_amd_ctxt {
256 /*
257 * Offsets to counter and control MSRs (relative to xen_pmu_arch.c.amd).
258 * For PV(H) guests these fields are RO.
259 */
260 uint32_t counters;
261 uint32_t ctrls;
262
263 /* Counter MSRs */
264 #if defined(__STDC_VERSION__) && __STDC_VERSION__ >= 199901L
265 uint64_t regs[];
266 #elif defined(__GNUC__)
267 uint64_t regs[0];
268 #endif
269 };
270
271 /* Intel PMU registers and structures */
272 struct xen_pmu_cntr_pair {
273 uint64_t counter;
274 uint64_t control;
275 };
276
277 struct xen_pmu_intel_ctxt {
278 /*
279 * Offsets to fixed and architectural counter MSRs (relative to
280 * xen_pmu_arch.c.intel).
281 * For PV(H) guests these fields are RO.
282 */
283 uint32_t fixed_counters;
284 uint32_t arch_counters;
285
286 /* PMU registers */
287 uint64_t global_ctrl;
288 uint64_t global_ovf_ctrl;
289 uint64_t global_status;
290 uint64_t fixed_ctrl;
291 uint64_t ds_area;
292 uint64_t pebs_enable;
293 uint64_t debugctl;
294
295 /* Fixed and architectural counter MSRs */
296 #if defined(__STDC_VERSION__) && __STDC_VERSION__ >= 199901L
297 uint64_t regs[];
298 #elif defined(__GNUC__)
299 uint64_t regs[0];
300 #endif
301 };
302
303 /* Sampled domain's registers */
304 struct xen_pmu_regs {
305 uint64_t ip;
306 uint64_t sp;
307 uint64_t flags;
308 uint16_t cs;
309 uint16_t ss;
310 uint8_t cpl;
311 uint8_t pad[3];
312 };
313
314 /* PMU flags */
315 #define PMU_CACHED (1<<0) /* PMU MSRs are cached in the context */
316 #define PMU_SAMPLE_USER (1<<1) /* Sample is from user or kernel mode */
317 #define PMU_SAMPLE_REAL (1<<2) /* Sample is from realmode */
318 #define PMU_SAMPLE_PV (1<<3) /* Sample from a PV guest */
319
320 /*
321 * Architecture-specific information describing state of the processor at
322 * the time of PMU interrupt.
323 * Fields of this structure marked as RW for guest should only be written by
324 * the guest when PMU_CACHED bit in pmu_flags is set (which is done by the
325 * hypervisor during PMU interrupt). Hypervisor will read updated data in
326 * XENPMU_flush hypercall and clear PMU_CACHED bit.
327 */
328 struct xen_pmu_arch {
329 union {
330 /*
331 * Processor's registers at the time of interrupt.
332 * WO for hypervisor, RO for guests.
333 */
334 struct xen_pmu_regs regs;
335 /*
336 * Padding for adding new registers to xen_pmu_regs in
337 * the future
338 */
339 #define XENPMU_REGS_PAD_SZ 64
340 uint8_t pad[XENPMU_REGS_PAD_SZ];
341 } r;
342
343 /* WO for hypervisor, RO for guest */
344 uint64_t pmu_flags;
345
346 /*
347 * APIC LVTPC register.
348 * RW for both hypervisor and guest.
349 * Only APIC_LVT_MASKED bit is loaded by the hypervisor into hardware
350 * during XENPMU_flush or XENPMU_lvtpc_set.
351 */
352 union {
353 uint32_t lapic_lvtpc;
354 uint64_t pad;
355 } l;
356
357 /*
358 * Vendor-specific PMU registers.
359 * RW for both hypervisor and guest (see exceptions above).
360 * Guest's updates to this field are verified and then loaded by the
361 * hypervisor into hardware during XENPMU_flush
362 */
363 union {
364 struct xen_pmu_amd_ctxt amd;
365 struct xen_pmu_intel_ctxt intel;
366
367 /*
368 * Padding for contexts (fixed parts only, does not include
369 * MSR banks that are specified by offsets)
370 */
371 #define XENPMU_CTXT_PAD_SZ 128
372 uint8_t pad[XENPMU_CTXT_PAD_SZ];
373 } c;
374 };
375
376 #endif /* !__ASSEMBLY__ */
377
378 /*
379 * Prefix forces emulation of some non-trapping instructions.
380 * Currently only CPUID.
381 */
382 #ifdef __ASSEMBLY__
383 #define XEN_EMULATE_PREFIX .byte 0x0f,0x0b,0x78,0x65,0x6e ;
384 #define XEN_CPUID XEN_EMULATE_PREFIX cpuid
385 #else
386 #define XEN_EMULATE_PREFIX ".byte 0x0f,0x0b,0x78,0x65,0x6e ; "
387 #define XEN_CPUID XEN_EMULATE_PREFIX "cpuid"
388 #endif
389
390 #endif /* _ASM_X86_XEN_INTERFACE_H */