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 #ifdef CONFIG_X86_32
186 uint32_t wc_sec_hi;
187 #endif
188 };
189 #endif /* !__ASSEMBLY__ */
190
191 #ifdef CONFIG_X86_32
192 #include <asm/xen/interface_32.h>
193 #else
194 #include <asm/xen/interface_64.h>
195 #endif
196
197 #include <asm/pvclock-abi.h>
198
199 #ifndef __ASSEMBLY__
200 /*
201 * The following is all CPU context. Note that the fpu_ctxt block is filled
202 * in by FXSAVE if the CPU has feature FXSR; otherwise FSAVE is used.
203 *
204 * Also note that when calling DOMCTL_setvcpucontext and VCPU_initialise
205 * for HVM and PVH guests, not all information in this structure is updated:
206 *
207 * - For HVM guests, the structures read include: fpu_ctxt (if
208 * VGCT_I387_VALID is set), flags, user_regs, debugreg[*]
209 *
210 * - PVH guests are the same as HVM guests, but additionally use ctrlreg[3] to
211 * set cr3. All other fields not used should be set to 0.
212 */
213 struct vcpu_guest_context {
214 /* FPU registers come first so they can be aligned for FXSAVE/FXRSTOR. */
215 struct { char x[512]; } fpu_ctxt; /* User-level FPU registers */
216 #define VGCF_I387_VALID (1<<0)
217 #define VGCF_IN_KERNEL (1<<2)
218 #define _VGCF_i387_valid 0
219 #define VGCF_i387_valid (1<<_VGCF_i387_valid)
220 #define _VGCF_in_kernel 2
221 #define VGCF_in_kernel (1<<_VGCF_in_kernel)
222 #define _VGCF_failsafe_disables_events 3
223 #define VGCF_failsafe_disables_events (1<<_VGCF_failsafe_disables_events)
224 #define _VGCF_syscall_disables_events 4
225 #define VGCF_syscall_disables_events (1<<_VGCF_syscall_disables_events)
226 #define _VGCF_online 5
227 #define VGCF_online (1<<_VGCF_online)
228 unsigned long flags; /* VGCF_* flags */
229 struct cpu_user_regs user_regs; /* User-level CPU registers */
230 struct trap_info trap_ctxt[256]; /* Virtual IDT */
231 unsigned long ldt_base, ldt_ents; /* LDT (linear address, # ents) */
232 unsigned long gdt_frames[16], gdt_ents; /* GDT (machine frames, # ents) */
233 unsigned long kernel_ss, kernel_sp; /* Virtual TSS (only SS1/SP1) */
234 /* NB. User pagetable on x86/64 is placed in ctrlreg[1]. */
235 unsigned long ctrlreg[8]; /* CR0-CR7 (control registers) */
236 unsigned long debugreg[8]; /* DB0-DB7 (debug registers) */
237 #ifdef __i386__
238 unsigned long event_callback_cs; /* CS:EIP of event callback */
239 unsigned long event_callback_eip;
240 unsigned long failsafe_callback_cs; /* CS:EIP of failsafe callback */
241 unsigned long failsafe_callback_eip;
242 #else
243 unsigned long event_callback_eip;
244 unsigned long failsafe_callback_eip;
245 unsigned long syscall_callback_eip;
246 #endif
247 unsigned long vm_assist; /* VMASST_TYPE_* bitmap */
248 #ifdef __x86_64__
249 /* Segment base addresses. */
250 uint64_t fs_base;
251 uint64_t gs_base_kernel;
252 uint64_t gs_base_user;
253 #endif
254 };
255 DEFINE_GUEST_HANDLE_STRUCT(vcpu_guest_context);
256
257 /* AMD PMU registers and structures */
258 struct xen_pmu_amd_ctxt {
259 /*
260 * Offsets to counter and control MSRs (relative to xen_pmu_arch.c.amd).
261 * For PV(H) guests these fields are RO.
262 */
263 uint32_t counters;
264 uint32_t ctrls;
265
266 /* Counter MSRs */
267 #if defined(__STDC_VERSION__) && __STDC_VERSION__ >= 199901L
268 uint64_t regs[];
269 #elif defined(__GNUC__)
270 uint64_t regs[0];
271 #endif
272 };
273
274 /* Intel PMU registers and structures */
275 struct xen_pmu_cntr_pair {
276 uint64_t counter;
277 uint64_t control;
278 };
279
280 struct xen_pmu_intel_ctxt {
281 /*
282 * Offsets to fixed and architectural counter MSRs (relative to
283 * xen_pmu_arch.c.intel).
284 * For PV(H) guests these fields are RO.
285 */
286 uint32_t fixed_counters;
287 uint32_t arch_counters;
288
289 /* PMU registers */
290 uint64_t global_ctrl;
291 uint64_t global_ovf_ctrl;
292 uint64_t global_status;
293 uint64_t fixed_ctrl;
294 uint64_t ds_area;
295 uint64_t pebs_enable;
296 uint64_t debugctl;
297
298 /* Fixed and architectural counter MSRs */
299 #if defined(__STDC_VERSION__) && __STDC_VERSION__ >= 199901L
300 uint64_t regs[];
301 #elif defined(__GNUC__)
302 uint64_t regs[0];
303 #endif
304 };
305
306 /* Sampled domain's registers */
307 struct xen_pmu_regs {
308 uint64_t ip;
309 uint64_t sp;
310 uint64_t flags;
311 uint16_t cs;
312 uint16_t ss;
313 uint8_t cpl;
314 uint8_t pad[3];
315 };
316
317 /* PMU flags */
318 #define PMU_CACHED (1<<0) /* PMU MSRs are cached in the context */
319 #define PMU_SAMPLE_USER (1<<1) /* Sample is from user or kernel mode */
320 #define PMU_SAMPLE_REAL (1<<2) /* Sample is from realmode */
321 #define PMU_SAMPLE_PV (1<<3) /* Sample from a PV guest */
322
323 /*
324 * Architecture-specific information describing state of the processor at
325 * the time of PMU interrupt.
326 * Fields of this structure marked as RW for guest should only be written by
327 * the guest when PMU_CACHED bit in pmu_flags is set (which is done by the
328 * hypervisor during PMU interrupt). Hypervisor will read updated data in
329 * XENPMU_flush hypercall and clear PMU_CACHED bit.
330 */
331 struct xen_pmu_arch {
332 union {
333 /*
334 * Processor's registers at the time of interrupt.
335 * WO for hypervisor, RO for guests.
336 */
337 struct xen_pmu_regs regs;
338 /*
339 * Padding for adding new registers to xen_pmu_regs in
340 * the future
341 */
342 #define XENPMU_REGS_PAD_SZ 64
343 uint8_t pad[XENPMU_REGS_PAD_SZ];
344 } r;
345
346 /* WO for hypervisor, RO for guest */
347 uint64_t pmu_flags;
348
349 /*
350 * APIC LVTPC register.
351 * RW for both hypervisor and guest.
352 * Only APIC_LVT_MASKED bit is loaded by the hypervisor into hardware
353 * during XENPMU_flush or XENPMU_lvtpc_set.
354 */
355 union {
356 uint32_t lapic_lvtpc;
357 uint64_t pad;
358 } l;
359
360 /*
361 * Vendor-specific PMU registers.
362 * RW for both hypervisor and guest (see exceptions above).
363 * Guest's updates to this field are verified and then loaded by the
364 * hypervisor into hardware during XENPMU_flush
365 */
366 union {
367 struct xen_pmu_amd_ctxt amd;
368 struct xen_pmu_intel_ctxt intel;
369
370 /*
371 * Padding for contexts (fixed parts only, does not include
372 * MSR banks that are specified by offsets)
373 */
374 #define XENPMU_CTXT_PAD_SZ 128
375 uint8_t pad[XENPMU_CTXT_PAD_SZ];
376 } c;
377 };
378
379 #endif /* !__ASSEMBLY__ */
380
381 /*
382 * Prefix forces emulation of some non-trapping instructions.
383 * Currently only CPUID.
384 */
385 #include <asm/emulate_prefix.h>
386
387 #define XEN_EMULATE_PREFIX __ASM_FORM(.byte __XEN_EMULATE_PREFIX ;)
388 #define XEN_CPUID XEN_EMULATE_PREFIX __ASM_FORM(cpuid)
389
390 #endif /* _ASM_X86_XEN_INTERFACE_H */
391
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