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1/*
2* This file is subject to the terms and conditions of the GNU General Public
3* License. See the file "COPYING" in the main directory of this archive
4* for more details.
5*
6* Copyright (C) 2012 MIPS Technologies, Inc. All rights reserved.
7* Authors: Sanjay Lal <sanjayl@kymasys.com>
8*/
9
10#ifndef __MIPS_KVM_HOST_H__
11#define __MIPS_KVM_HOST_H__
12
13#include <linux/mutex.h>
14#include <linux/hrtimer.h>
15#include <linux/interrupt.h>
16#include <linux/types.h>
17#include <linux/kvm.h>
18#include <linux/kvm_types.h>
19#include <linux/threads.h>
20#include <linux/spinlock.h>
21
22#include <asm/inst.h>
23#include <asm/mipsregs.h>
24
25/* MIPS KVM register ids */
26#define MIPS_CP0_32(_R, _S) \
27 (KVM_REG_MIPS_CP0 | KVM_REG_SIZE_U32 | (8 * (_R) + (_S)))
28
29#define MIPS_CP0_64(_R, _S) \
30 (KVM_REG_MIPS_CP0 | KVM_REG_SIZE_U64 | (8 * (_R) + (_S)))
31
32#define KVM_REG_MIPS_CP0_INDEX MIPS_CP0_32(0, 0)
33#define KVM_REG_MIPS_CP0_ENTRYLO0 MIPS_CP0_64(2, 0)
34#define KVM_REG_MIPS_CP0_ENTRYLO1 MIPS_CP0_64(3, 0)
35#define KVM_REG_MIPS_CP0_CONTEXT MIPS_CP0_64(4, 0)
36#define KVM_REG_MIPS_CP0_USERLOCAL MIPS_CP0_64(4, 2)
37#define KVM_REG_MIPS_CP0_PAGEMASK MIPS_CP0_32(5, 0)
38#define KVM_REG_MIPS_CP0_PAGEGRAIN MIPS_CP0_32(5, 1)
39#define KVM_REG_MIPS_CP0_WIRED MIPS_CP0_32(6, 0)
40#define KVM_REG_MIPS_CP0_HWRENA MIPS_CP0_32(7, 0)
41#define KVM_REG_MIPS_CP0_BADVADDR MIPS_CP0_64(8, 0)
42#define KVM_REG_MIPS_CP0_COUNT MIPS_CP0_32(9, 0)
43#define KVM_REG_MIPS_CP0_ENTRYHI MIPS_CP0_64(10, 0)
44#define KVM_REG_MIPS_CP0_COMPARE MIPS_CP0_32(11, 0)
45#define KVM_REG_MIPS_CP0_STATUS MIPS_CP0_32(12, 0)
46#define KVM_REG_MIPS_CP0_CAUSE MIPS_CP0_32(13, 0)
47#define KVM_REG_MIPS_CP0_EPC MIPS_CP0_64(14, 0)
48#define KVM_REG_MIPS_CP0_PRID MIPS_CP0_32(15, 0)
49#define KVM_REG_MIPS_CP0_EBASE MIPS_CP0_64(15, 1)
50#define KVM_REG_MIPS_CP0_CONFIG MIPS_CP0_32(16, 0)
51#define KVM_REG_MIPS_CP0_CONFIG1 MIPS_CP0_32(16, 1)
52#define KVM_REG_MIPS_CP0_CONFIG2 MIPS_CP0_32(16, 2)
53#define KVM_REG_MIPS_CP0_CONFIG3 MIPS_CP0_32(16, 3)
54#define KVM_REG_MIPS_CP0_CONFIG4 MIPS_CP0_32(16, 4)
55#define KVM_REG_MIPS_CP0_CONFIG5 MIPS_CP0_32(16, 5)
56#define KVM_REG_MIPS_CP0_CONFIG7 MIPS_CP0_32(16, 7)
57#define KVM_REG_MIPS_CP0_XCONTEXT MIPS_CP0_64(20, 0)
58#define KVM_REG_MIPS_CP0_ERROREPC MIPS_CP0_64(30, 0)
59#define KVM_REG_MIPS_CP0_KSCRATCH1 MIPS_CP0_64(31, 2)
60#define KVM_REG_MIPS_CP0_KSCRATCH2 MIPS_CP0_64(31, 3)
61#define KVM_REG_MIPS_CP0_KSCRATCH3 MIPS_CP0_64(31, 4)
62#define KVM_REG_MIPS_CP0_KSCRATCH4 MIPS_CP0_64(31, 5)
63#define KVM_REG_MIPS_CP0_KSCRATCH5 MIPS_CP0_64(31, 6)
64#define KVM_REG_MIPS_CP0_KSCRATCH6 MIPS_CP0_64(31, 7)
65
66
67#define KVM_MAX_VCPUS 1
68#define KVM_USER_MEM_SLOTS 8
69/* memory slots that does not exposed to userspace */
70#define KVM_PRIVATE_MEM_SLOTS 0
71
72#define KVM_COALESCED_MMIO_PAGE_OFFSET 1
73#define KVM_HALT_POLL_NS_DEFAULT 500000
74
75
76
77/*
78 * Special address that contains the comm page, used for reducing # of traps
79 * This needs to be within 32Kb of 0x0 (so the zero register can be used), but
80 * preferably not at 0x0 so that most kernel NULL pointer dereferences can be
81 * caught.
82 */
83#define KVM_GUEST_COMMPAGE_ADDR ((PAGE_SIZE > 0x8000) ? 0 : \
84 (0x8000 - PAGE_SIZE))
85
86#define KVM_GUEST_KERNEL_MODE(vcpu) ((kvm_read_c0_guest_status(vcpu->arch.cop0) & (ST0_EXL | ST0_ERL)) || \
87 ((kvm_read_c0_guest_status(vcpu->arch.cop0) & KSU_USER) == 0))
88
89#define KVM_GUEST_KUSEG 0x00000000UL
90#define KVM_GUEST_KSEG0 0x40000000UL
91#define KVM_GUEST_KSEG23 0x60000000UL
92#define KVM_GUEST_KSEGX(a) ((_ACAST32_(a)) & 0xe0000000)
93#define KVM_GUEST_CPHYSADDR(a) ((_ACAST32_(a)) & 0x1fffffff)
94
95#define KVM_GUEST_CKSEG0ADDR(a) (KVM_GUEST_CPHYSADDR(a) | KVM_GUEST_KSEG0)
96#define KVM_GUEST_CKSEG1ADDR(a) (KVM_GUEST_CPHYSADDR(a) | KVM_GUEST_KSEG1)
97#define KVM_GUEST_CKSEG23ADDR(a) (KVM_GUEST_CPHYSADDR(a) | KVM_GUEST_KSEG23)
98
99/*
100 * Map an address to a certain kernel segment
101 */
102#define KVM_GUEST_KSEG0ADDR(a) (KVM_GUEST_CPHYSADDR(a) | KVM_GUEST_KSEG0)
103#define KVM_GUEST_KSEG1ADDR(a) (KVM_GUEST_CPHYSADDR(a) | KVM_GUEST_KSEG1)
104#define KVM_GUEST_KSEG23ADDR(a) (KVM_GUEST_CPHYSADDR(a) | KVM_GUEST_KSEG23)
105
106#define KVM_INVALID_PAGE 0xdeadbeef
107#define KVM_INVALID_INST 0xdeadbeef
108#define KVM_INVALID_ADDR 0xdeadbeef
109
110/*
111 * EVA has overlapping user & kernel address spaces, so user VAs may be >
112 * PAGE_OFFSET. For this reason we can't use the default KVM_HVA_ERR_BAD of
113 * PAGE_OFFSET.
114 */
115
116#define KVM_HVA_ERR_BAD (-1UL)
117#define KVM_HVA_ERR_RO_BAD (-2UL)
118
119static inline bool kvm_is_error_hva(unsigned long addr)
120{
121 return IS_ERR_VALUE(addr);
122}
123
124extern atomic_t kvm_mips_instance;
125
126struct kvm_vm_stat {
127 ulong remote_tlb_flush;
128};
129
130struct kvm_vcpu_stat {
131 u64 wait_exits;
132 u64 cache_exits;
133 u64 signal_exits;
134 u64 int_exits;
135 u64 cop_unusable_exits;
136 u64 tlbmod_exits;
137 u64 tlbmiss_ld_exits;
138 u64 tlbmiss_st_exits;
139 u64 addrerr_st_exits;
140 u64 addrerr_ld_exits;
141 u64 syscall_exits;
142 u64 resvd_inst_exits;
143 u64 break_inst_exits;
144 u64 trap_inst_exits;
145 u64 msa_fpe_exits;
146 u64 fpe_exits;
147 u64 msa_disabled_exits;
148 u64 flush_dcache_exits;
149 u64 halt_successful_poll;
150 u64 halt_attempted_poll;
151 u64 halt_poll_invalid;
152 u64 halt_wakeup;
153};
154
155struct kvm_arch_memory_slot {
156};
157
158struct kvm_arch {
159 /* Guest GVA->HPA page table */
160 unsigned long *guest_pmap;
161 unsigned long guest_pmap_npages;
162
163 /* Wired host TLB used for the commpage */
164 int commpage_tlb;
165};
166
167#define N_MIPS_COPROC_REGS 32
168#define N_MIPS_COPROC_SEL 8
169
170struct mips_coproc {
171 unsigned long reg[N_MIPS_COPROC_REGS][N_MIPS_COPROC_SEL];
172#ifdef CONFIG_KVM_MIPS_DEBUG_COP0_COUNTERS
173 unsigned long stat[N_MIPS_COPROC_REGS][N_MIPS_COPROC_SEL];
174#endif
175};
176
177/*
178 * Coprocessor 0 register names
179 */
180#define MIPS_CP0_TLB_INDEX 0
181#define MIPS_CP0_TLB_RANDOM 1
182#define MIPS_CP0_TLB_LOW 2
183#define MIPS_CP0_TLB_LO0 2
184#define MIPS_CP0_TLB_LO1 3
185#define MIPS_CP0_TLB_CONTEXT 4
186#define MIPS_CP0_TLB_PG_MASK 5
187#define MIPS_CP0_TLB_WIRED 6
188#define MIPS_CP0_HWRENA 7
189#define MIPS_CP0_BAD_VADDR 8
190#define MIPS_CP0_COUNT 9
191#define MIPS_CP0_TLB_HI 10
192#define MIPS_CP0_COMPARE 11
193#define MIPS_CP0_STATUS 12
194#define MIPS_CP0_CAUSE 13
195#define MIPS_CP0_EXC_PC 14
196#define MIPS_CP0_PRID 15
197#define MIPS_CP0_CONFIG 16
198#define MIPS_CP0_LLADDR 17
199#define MIPS_CP0_WATCH_LO 18
200#define MIPS_CP0_WATCH_HI 19
201#define MIPS_CP0_TLB_XCONTEXT 20
202#define MIPS_CP0_ECC 26
203#define MIPS_CP0_CACHE_ERR 27
204#define MIPS_CP0_TAG_LO 28
205#define MIPS_CP0_TAG_HI 29
206#define MIPS_CP0_ERROR_PC 30
207#define MIPS_CP0_DEBUG 23
208#define MIPS_CP0_DEPC 24
209#define MIPS_CP0_PERFCNT 25
210#define MIPS_CP0_ERRCTL 26
211#define MIPS_CP0_DATA_LO 28
212#define MIPS_CP0_DATA_HI 29
213#define MIPS_CP0_DESAVE 31
214
215#define MIPS_CP0_CONFIG_SEL 0
216#define MIPS_CP0_CONFIG1_SEL 1
217#define MIPS_CP0_CONFIG2_SEL 2
218#define MIPS_CP0_CONFIG3_SEL 3
219#define MIPS_CP0_CONFIG4_SEL 4
220#define MIPS_CP0_CONFIG5_SEL 5
221
222/* Resume Flags */
223#define RESUME_FLAG_DR (1<<0) /* Reload guest nonvolatile state? */
224#define RESUME_FLAG_HOST (1<<1) /* Resume host? */
225
226#define RESUME_GUEST 0
227#define RESUME_GUEST_DR RESUME_FLAG_DR
228#define RESUME_HOST RESUME_FLAG_HOST
229
230enum emulation_result {
231 EMULATE_DONE, /* no further processing */
232 EMULATE_DO_MMIO, /* kvm_run filled with MMIO request */
233 EMULATE_FAIL, /* can't emulate this instruction */
234 EMULATE_WAIT, /* WAIT instruction */
235 EMULATE_PRIV_FAIL,
236};
237
238#define mips3_paddr_to_tlbpfn(x) \
239 (((unsigned long)(x) >> MIPS3_PG_SHIFT) & MIPS3_PG_FRAME)
240#define mips3_tlbpfn_to_paddr(x) \
241 ((unsigned long)((x) & MIPS3_PG_FRAME) << MIPS3_PG_SHIFT)
242
243#define MIPS3_PG_SHIFT 6
244#define MIPS3_PG_FRAME 0x3fffffc0
245
246#define VPN2_MASK 0xffffe000
247#define KVM_ENTRYHI_ASID MIPS_ENTRYHI_ASID
248#define TLB_IS_GLOBAL(x) ((x).tlb_lo[0] & (x).tlb_lo[1] & ENTRYLO_G)
249#define TLB_VPN2(x) ((x).tlb_hi & VPN2_MASK)
250#define TLB_ASID(x) ((x).tlb_hi & KVM_ENTRYHI_ASID)
251#define TLB_LO_IDX(x, va) (((va) >> PAGE_SHIFT) & 1)
252#define TLB_IS_VALID(x, va) ((x).tlb_lo[TLB_LO_IDX(x, va)] & ENTRYLO_V)
253#define TLB_HI_VPN2_HIT(x, y) ((TLB_VPN2(x) & ~(x).tlb_mask) == \
254 ((y) & VPN2_MASK & ~(x).tlb_mask))
255#define TLB_HI_ASID_HIT(x, y) (TLB_IS_GLOBAL(x) || \
256 TLB_ASID(x) == ((y) & KVM_ENTRYHI_ASID))
257
258struct kvm_mips_tlb {
259 long tlb_mask;
260 long tlb_hi;
261 long tlb_lo[2];
262};
263
264#define KVM_MIPS_AUX_FPU 0x1
265#define KVM_MIPS_AUX_MSA 0x2
266
267#define KVM_MIPS_GUEST_TLB_SIZE 64
268struct kvm_vcpu_arch {
269 void *guest_ebase;
270 int (*vcpu_run)(struct kvm_run *run, struct kvm_vcpu *vcpu);
271 unsigned long host_stack;
272 unsigned long host_gp;
273
274 /* Host CP0 registers used when handling exits from guest */
275 unsigned long host_cp0_badvaddr;
276 unsigned long host_cp0_epc;
277 u32 host_cp0_cause;
278
279 /* GPRS */
280 unsigned long gprs[32];
281 unsigned long hi;
282 unsigned long lo;
283 unsigned long pc;
284
285 /* FPU State */
286 struct mips_fpu_struct fpu;
287 /* Which auxiliary state is loaded (KVM_MIPS_AUX_*) */
288 unsigned int aux_inuse;
289
290 /* COP0 State */
291 struct mips_coproc *cop0;
292
293 /* Host KSEG0 address of the EI/DI offset */
294 void *kseg0_commpage;
295
296 /* Resume PC after MMIO completion */
297 unsigned long io_pc;
298 /* GPR used as IO source/target */
299 u32 io_gpr;
300
301 struct hrtimer comparecount_timer;
302 /* Count timer control KVM register */
303 u32 count_ctl;
304 /* Count bias from the raw time */
305 u32 count_bias;
306 /* Frequency of timer in Hz */
307 u32 count_hz;
308 /* Dynamic nanosecond bias (multiple of count_period) to avoid overflow */
309 s64 count_dyn_bias;
310 /* Resume time */
311 ktime_t count_resume;
312 /* Period of timer tick in ns */
313 u64 count_period;
314
315 /* Bitmask of exceptions that are pending */
316 unsigned long pending_exceptions;
317
318 /* Bitmask of pending exceptions to be cleared */
319 unsigned long pending_exceptions_clr;
320
321 /* Save/Restore the entryhi register when are are preempted/scheduled back in */
322 unsigned long preempt_entryhi;
323
324 /* S/W Based TLB for guest */
325 struct kvm_mips_tlb guest_tlb[KVM_MIPS_GUEST_TLB_SIZE];
326
327 /* Cached guest kernel/user ASIDs */
328 u32 guest_user_asid[NR_CPUS];
329 u32 guest_kernel_asid[NR_CPUS];
330 struct mm_struct guest_kernel_mm, guest_user_mm;
331
332 /* Guest ASID of last user mode execution */
333 unsigned int last_user_gasid;
334
335 int last_sched_cpu;
336
337 /* WAIT executed */
338 int wait;
339
340 u8 fpu_enabled;
341 u8 msa_enabled;
342 u8 kscratch_enabled;
343};
344
345
346#define kvm_read_c0_guest_index(cop0) (cop0->reg[MIPS_CP0_TLB_INDEX][0])
347#define kvm_write_c0_guest_index(cop0, val) (cop0->reg[MIPS_CP0_TLB_INDEX][0] = val)
348#define kvm_read_c0_guest_entrylo0(cop0) (cop0->reg[MIPS_CP0_TLB_LO0][0])
349#define kvm_read_c0_guest_entrylo1(cop0) (cop0->reg[MIPS_CP0_TLB_LO1][0])
350#define kvm_read_c0_guest_context(cop0) (cop0->reg[MIPS_CP0_TLB_CONTEXT][0])
351#define kvm_write_c0_guest_context(cop0, val) (cop0->reg[MIPS_CP0_TLB_CONTEXT][0] = (val))
352#define kvm_read_c0_guest_userlocal(cop0) (cop0->reg[MIPS_CP0_TLB_CONTEXT][2])
353#define kvm_write_c0_guest_userlocal(cop0, val) (cop0->reg[MIPS_CP0_TLB_CONTEXT][2] = (val))
354#define kvm_read_c0_guest_pagemask(cop0) (cop0->reg[MIPS_CP0_TLB_PG_MASK][0])
355#define kvm_write_c0_guest_pagemask(cop0, val) (cop0->reg[MIPS_CP0_TLB_PG_MASK][0] = (val))
356#define kvm_read_c0_guest_wired(cop0) (cop0->reg[MIPS_CP0_TLB_WIRED][0])
357#define kvm_write_c0_guest_wired(cop0, val) (cop0->reg[MIPS_CP0_TLB_WIRED][0] = (val))
358#define kvm_read_c0_guest_hwrena(cop0) (cop0->reg[MIPS_CP0_HWRENA][0])
359#define kvm_write_c0_guest_hwrena(cop0, val) (cop0->reg[MIPS_CP0_HWRENA][0] = (val))
360#define kvm_read_c0_guest_badvaddr(cop0) (cop0->reg[MIPS_CP0_BAD_VADDR][0])
361#define kvm_write_c0_guest_badvaddr(cop0, val) (cop0->reg[MIPS_CP0_BAD_VADDR][0] = (val))
362#define kvm_read_c0_guest_count(cop0) (cop0->reg[MIPS_CP0_COUNT][0])
363#define kvm_write_c0_guest_count(cop0, val) (cop0->reg[MIPS_CP0_COUNT][0] = (val))
364#define kvm_read_c0_guest_entryhi(cop0) (cop0->reg[MIPS_CP0_TLB_HI][0])
365#define kvm_write_c0_guest_entryhi(cop0, val) (cop0->reg[MIPS_CP0_TLB_HI][0] = (val))
366#define kvm_read_c0_guest_compare(cop0) (cop0->reg[MIPS_CP0_COMPARE][0])
367#define kvm_write_c0_guest_compare(cop0, val) (cop0->reg[MIPS_CP0_COMPARE][0] = (val))
368#define kvm_read_c0_guest_status(cop0) (cop0->reg[MIPS_CP0_STATUS][0])
369#define kvm_write_c0_guest_status(cop0, val) (cop0->reg[MIPS_CP0_STATUS][0] = (val))
370#define kvm_read_c0_guest_intctl(cop0) (cop0->reg[MIPS_CP0_STATUS][1])
371#define kvm_write_c0_guest_intctl(cop0, val) (cop0->reg[MIPS_CP0_STATUS][1] = (val))
372#define kvm_read_c0_guest_cause(cop0) (cop0->reg[MIPS_CP0_CAUSE][0])
373#define kvm_write_c0_guest_cause(cop0, val) (cop0->reg[MIPS_CP0_CAUSE][0] = (val))
374#define kvm_read_c0_guest_epc(cop0) (cop0->reg[MIPS_CP0_EXC_PC][0])
375#define kvm_write_c0_guest_epc(cop0, val) (cop0->reg[MIPS_CP0_EXC_PC][0] = (val))
376#define kvm_read_c0_guest_prid(cop0) (cop0->reg[MIPS_CP0_PRID][0])
377#define kvm_write_c0_guest_prid(cop0, val) (cop0->reg[MIPS_CP0_PRID][0] = (val))
378#define kvm_read_c0_guest_ebase(cop0) (cop0->reg[MIPS_CP0_PRID][1])
379#define kvm_write_c0_guest_ebase(cop0, val) (cop0->reg[MIPS_CP0_PRID][1] = (val))
380#define kvm_read_c0_guest_config(cop0) (cop0->reg[MIPS_CP0_CONFIG][0])
381#define kvm_read_c0_guest_config1(cop0) (cop0->reg[MIPS_CP0_CONFIG][1])
382#define kvm_read_c0_guest_config2(cop0) (cop0->reg[MIPS_CP0_CONFIG][2])
383#define kvm_read_c0_guest_config3(cop0) (cop0->reg[MIPS_CP0_CONFIG][3])
384#define kvm_read_c0_guest_config4(cop0) (cop0->reg[MIPS_CP0_CONFIG][4])
385#define kvm_read_c0_guest_config5(cop0) (cop0->reg[MIPS_CP0_CONFIG][5])
386#define kvm_read_c0_guest_config7(cop0) (cop0->reg[MIPS_CP0_CONFIG][7])
387#define kvm_write_c0_guest_config(cop0, val) (cop0->reg[MIPS_CP0_CONFIG][0] = (val))
388#define kvm_write_c0_guest_config1(cop0, val) (cop0->reg[MIPS_CP0_CONFIG][1] = (val))
389#define kvm_write_c0_guest_config2(cop0, val) (cop0->reg[MIPS_CP0_CONFIG][2] = (val))
390#define kvm_write_c0_guest_config3(cop0, val) (cop0->reg[MIPS_CP0_CONFIG][3] = (val))
391#define kvm_write_c0_guest_config4(cop0, val) (cop0->reg[MIPS_CP0_CONFIG][4] = (val))
392#define kvm_write_c0_guest_config5(cop0, val) (cop0->reg[MIPS_CP0_CONFIG][5] = (val))
393#define kvm_write_c0_guest_config7(cop0, val) (cop0->reg[MIPS_CP0_CONFIG][7] = (val))
394#define kvm_read_c0_guest_errorepc(cop0) (cop0->reg[MIPS_CP0_ERROR_PC][0])
395#define kvm_write_c0_guest_errorepc(cop0, val) (cop0->reg[MIPS_CP0_ERROR_PC][0] = (val))
396#define kvm_read_c0_guest_kscratch1(cop0) (cop0->reg[MIPS_CP0_DESAVE][2])
397#define kvm_read_c0_guest_kscratch2(cop0) (cop0->reg[MIPS_CP0_DESAVE][3])
398#define kvm_read_c0_guest_kscratch3(cop0) (cop0->reg[MIPS_CP0_DESAVE][4])
399#define kvm_read_c0_guest_kscratch4(cop0) (cop0->reg[MIPS_CP0_DESAVE][5])
400#define kvm_read_c0_guest_kscratch5(cop0) (cop0->reg[MIPS_CP0_DESAVE][6])
401#define kvm_read_c0_guest_kscratch6(cop0) (cop0->reg[MIPS_CP0_DESAVE][7])
402#define kvm_write_c0_guest_kscratch1(cop0, val) (cop0->reg[MIPS_CP0_DESAVE][2] = (val))
403#define kvm_write_c0_guest_kscratch2(cop0, val) (cop0->reg[MIPS_CP0_DESAVE][3] = (val))
404#define kvm_write_c0_guest_kscratch3(cop0, val) (cop0->reg[MIPS_CP0_DESAVE][4] = (val))
405#define kvm_write_c0_guest_kscratch4(cop0, val) (cop0->reg[MIPS_CP0_DESAVE][5] = (val))
406#define kvm_write_c0_guest_kscratch5(cop0, val) (cop0->reg[MIPS_CP0_DESAVE][6] = (val))
407#define kvm_write_c0_guest_kscratch6(cop0, val) (cop0->reg[MIPS_CP0_DESAVE][7] = (val))
408
409/*
410 * Some of the guest registers may be modified asynchronously (e.g. from a
411 * hrtimer callback in hard irq context) and therefore need stronger atomicity
412 * guarantees than other registers.
413 */
414
415static inline void _kvm_atomic_set_c0_guest_reg(unsigned long *reg,
416 unsigned long val)
417{
418 unsigned long temp;
419 do {
420 __asm__ __volatile__(
421 " .set "MIPS_ISA_ARCH_LEVEL" \n"
422 " " __LL "%0, %1 \n"
423 " or %0, %2 \n"
424 " " __SC "%0, %1 \n"
425 " .set mips0 \n"
426 : "=&r" (temp), "+m" (*reg)
427 : "r" (val));
428 } while (unlikely(!temp));
429}
430
431static inline void _kvm_atomic_clear_c0_guest_reg(unsigned long *reg,
432 unsigned long val)
433{
434 unsigned long temp;
435 do {
436 __asm__ __volatile__(
437 " .set "MIPS_ISA_ARCH_LEVEL" \n"
438 " " __LL "%0, %1 \n"
439 " and %0, %2 \n"
440 " " __SC "%0, %1 \n"
441 " .set mips0 \n"
442 : "=&r" (temp), "+m" (*reg)
443 : "r" (~val));
444 } while (unlikely(!temp));
445}
446
447static inline void _kvm_atomic_change_c0_guest_reg(unsigned long *reg,
448 unsigned long change,
449 unsigned long val)
450{
451 unsigned long temp;
452 do {
453 __asm__ __volatile__(
454 " .set "MIPS_ISA_ARCH_LEVEL" \n"
455 " " __LL "%0, %1 \n"
456 " and %0, %2 \n"
457 " or %0, %3 \n"
458 " " __SC "%0, %1 \n"
459 " .set mips0 \n"
460 : "=&r" (temp), "+m" (*reg)
461 : "r" (~change), "r" (val & change));
462 } while (unlikely(!temp));
463}
464
465#define kvm_set_c0_guest_status(cop0, val) (cop0->reg[MIPS_CP0_STATUS][0] |= (val))
466#define kvm_clear_c0_guest_status(cop0, val) (cop0->reg[MIPS_CP0_STATUS][0] &= ~(val))
467
468/* Cause can be modified asynchronously from hardirq hrtimer callback */
469#define kvm_set_c0_guest_cause(cop0, val) \
470 _kvm_atomic_set_c0_guest_reg(&cop0->reg[MIPS_CP0_CAUSE][0], val)
471#define kvm_clear_c0_guest_cause(cop0, val) \
472 _kvm_atomic_clear_c0_guest_reg(&cop0->reg[MIPS_CP0_CAUSE][0], val)
473#define kvm_change_c0_guest_cause(cop0, change, val) \
474 _kvm_atomic_change_c0_guest_reg(&cop0->reg[MIPS_CP0_CAUSE][0], \
475 change, val)
476
477#define kvm_set_c0_guest_ebase(cop0, val) (cop0->reg[MIPS_CP0_PRID][1] |= (val))
478#define kvm_clear_c0_guest_ebase(cop0, val) (cop0->reg[MIPS_CP0_PRID][1] &= ~(val))
479#define kvm_change_c0_guest_ebase(cop0, change, val) \
480{ \
481 kvm_clear_c0_guest_ebase(cop0, change); \
482 kvm_set_c0_guest_ebase(cop0, ((val) & (change))); \
483}
484
485/* Helpers */
486
487static inline bool kvm_mips_guest_can_have_fpu(struct kvm_vcpu_arch *vcpu)
488{
489 return (!__builtin_constant_p(raw_cpu_has_fpu) || raw_cpu_has_fpu) &&
490 vcpu->fpu_enabled;
491}
492
493static inline bool kvm_mips_guest_has_fpu(struct kvm_vcpu_arch *vcpu)
494{
495 return kvm_mips_guest_can_have_fpu(vcpu) &&
496 kvm_read_c0_guest_config1(vcpu->cop0) & MIPS_CONF1_FP;
497}
498
499static inline bool kvm_mips_guest_can_have_msa(struct kvm_vcpu_arch *vcpu)
500{
501 return (!__builtin_constant_p(cpu_has_msa) || cpu_has_msa) &&
502 vcpu->msa_enabled;
503}
504
505static inline bool kvm_mips_guest_has_msa(struct kvm_vcpu_arch *vcpu)
506{
507 return kvm_mips_guest_can_have_msa(vcpu) &&
508 kvm_read_c0_guest_config3(vcpu->cop0) & MIPS_CONF3_MSA;
509}
510
511struct kvm_mips_callbacks {
512 int (*handle_cop_unusable)(struct kvm_vcpu *vcpu);
513 int (*handle_tlb_mod)(struct kvm_vcpu *vcpu);
514 int (*handle_tlb_ld_miss)(struct kvm_vcpu *vcpu);
515 int (*handle_tlb_st_miss)(struct kvm_vcpu *vcpu);
516 int (*handle_addr_err_st)(struct kvm_vcpu *vcpu);
517 int (*handle_addr_err_ld)(struct kvm_vcpu *vcpu);
518 int (*handle_syscall)(struct kvm_vcpu *vcpu);
519 int (*handle_res_inst)(struct kvm_vcpu *vcpu);
520 int (*handle_break)(struct kvm_vcpu *vcpu);
521 int (*handle_trap)(struct kvm_vcpu *vcpu);
522 int (*handle_msa_fpe)(struct kvm_vcpu *vcpu);
523 int (*handle_fpe)(struct kvm_vcpu *vcpu);
524 int (*handle_msa_disabled)(struct kvm_vcpu *vcpu);
525 int (*vm_init)(struct kvm *kvm);
526 int (*vcpu_init)(struct kvm_vcpu *vcpu);
527 int (*vcpu_setup)(struct kvm_vcpu *vcpu);
528 gpa_t (*gva_to_gpa)(gva_t gva);
529 void (*queue_timer_int)(struct kvm_vcpu *vcpu);
530 void (*dequeue_timer_int)(struct kvm_vcpu *vcpu);
531 void (*queue_io_int)(struct kvm_vcpu *vcpu,
532 struct kvm_mips_interrupt *irq);
533 void (*dequeue_io_int)(struct kvm_vcpu *vcpu,
534 struct kvm_mips_interrupt *irq);
535 int (*irq_deliver)(struct kvm_vcpu *vcpu, unsigned int priority,
536 u32 cause);
537 int (*irq_clear)(struct kvm_vcpu *vcpu, unsigned int priority,
538 u32 cause);
539 unsigned long (*num_regs)(struct kvm_vcpu *vcpu);
540 int (*copy_reg_indices)(struct kvm_vcpu *vcpu, u64 __user *indices);
541 int (*get_one_reg)(struct kvm_vcpu *vcpu,
542 const struct kvm_one_reg *reg, s64 *v);
543 int (*set_one_reg)(struct kvm_vcpu *vcpu,
544 const struct kvm_one_reg *reg, s64 v);
545 int (*vcpu_get_regs)(struct kvm_vcpu *vcpu);
546 int (*vcpu_set_regs)(struct kvm_vcpu *vcpu);
547};
548extern struct kvm_mips_callbacks *kvm_mips_callbacks;
549int kvm_mips_emulation_init(struct kvm_mips_callbacks **install_callbacks);
550
551/* Debug: dump vcpu state */
552int kvm_arch_vcpu_dump_regs(struct kvm_vcpu *vcpu);
553
554extern int kvm_mips_handle_exit(struct kvm_run *run, struct kvm_vcpu *vcpu);
555
556/* Building of entry/exception code */
557int kvm_mips_entry_setup(void);
558void *kvm_mips_build_vcpu_run(void *addr);
559void *kvm_mips_build_exception(void *addr, void *handler);
560void *kvm_mips_build_exit(void *addr);
561
562/* FPU/MSA context management */
563void __kvm_save_fpu(struct kvm_vcpu_arch *vcpu);
564void __kvm_restore_fpu(struct kvm_vcpu_arch *vcpu);
565void __kvm_restore_fcsr(struct kvm_vcpu_arch *vcpu);
566void __kvm_save_msa(struct kvm_vcpu_arch *vcpu);
567void __kvm_restore_msa(struct kvm_vcpu_arch *vcpu);
568void __kvm_restore_msa_upper(struct kvm_vcpu_arch *vcpu);
569void __kvm_restore_msacsr(struct kvm_vcpu_arch *vcpu);
570void kvm_own_fpu(struct kvm_vcpu *vcpu);
571void kvm_own_msa(struct kvm_vcpu *vcpu);
572void kvm_drop_fpu(struct kvm_vcpu *vcpu);
573void kvm_lose_fpu(struct kvm_vcpu *vcpu);
574
575/* TLB handling */
576u32 kvm_get_kernel_asid(struct kvm_vcpu *vcpu);
577
578u32 kvm_get_user_asid(struct kvm_vcpu *vcpu);
579
580u32 kvm_get_commpage_asid (struct kvm_vcpu *vcpu);
581
582extern int kvm_mips_handle_kseg0_tlb_fault(unsigned long badbaddr,
583 struct kvm_vcpu *vcpu);
584
585extern int kvm_mips_handle_commpage_tlb_fault(unsigned long badvaddr,
586 struct kvm_vcpu *vcpu);
587
588extern int kvm_mips_handle_mapped_seg_tlb_fault(struct kvm_vcpu *vcpu,
589 struct kvm_mips_tlb *tlb);
590
591extern enum emulation_result kvm_mips_handle_tlbmiss(u32 cause,
592 u32 *opc,
593 struct kvm_run *run,
594 struct kvm_vcpu *vcpu);
595
596extern enum emulation_result kvm_mips_handle_tlbmod(u32 cause,
597 u32 *opc,
598 struct kvm_run *run,
599 struct kvm_vcpu *vcpu);
600
601extern void kvm_mips_dump_host_tlbs(void);
602extern void kvm_mips_dump_guest_tlbs(struct kvm_vcpu *vcpu);
603extern int kvm_mips_host_tlb_write(struct kvm_vcpu *vcpu, unsigned long entryhi,
604 unsigned long entrylo0,
605 unsigned long entrylo1,
606 int flush_dcache_mask);
607extern void kvm_mips_flush_host_tlb(int skip_kseg0);
608extern int kvm_mips_host_tlb_inv(struct kvm_vcpu *vcpu, unsigned long entryhi);
609
610extern int kvm_mips_guest_tlb_lookup(struct kvm_vcpu *vcpu,
611 unsigned long entryhi);
612extern int kvm_mips_host_tlb_lookup(struct kvm_vcpu *vcpu, unsigned long vaddr);
613extern unsigned long kvm_mips_translate_guest_kseg0_to_hpa(struct kvm_vcpu *vcpu,
614 unsigned long gva);
615extern void kvm_get_new_mmu_context(struct mm_struct *mm, unsigned long cpu,
616 struct kvm_vcpu *vcpu);
617extern void kvm_local_flush_tlb_all(void);
618extern void kvm_mips_alloc_new_mmu_context(struct kvm_vcpu *vcpu);
619extern void kvm_mips_vcpu_load(struct kvm_vcpu *vcpu, int cpu);
620extern void kvm_mips_vcpu_put(struct kvm_vcpu *vcpu);
621
622/* Emulation */
623u32 kvm_get_inst(u32 *opc, struct kvm_vcpu *vcpu);
624enum emulation_result update_pc(struct kvm_vcpu *vcpu, u32 cause);
625
626extern enum emulation_result kvm_mips_emulate_inst(u32 cause,
627 u32 *opc,
628 struct kvm_run *run,
629 struct kvm_vcpu *vcpu);
630
631extern enum emulation_result kvm_mips_emulate_syscall(u32 cause,
632 u32 *opc,
633 struct kvm_run *run,
634 struct kvm_vcpu *vcpu);
635
636extern enum emulation_result kvm_mips_emulate_tlbmiss_ld(u32 cause,
637 u32 *opc,
638 struct kvm_run *run,
639 struct kvm_vcpu *vcpu);
640
641extern enum emulation_result kvm_mips_emulate_tlbinv_ld(u32 cause,
642 u32 *opc,
643 struct kvm_run *run,
644 struct kvm_vcpu *vcpu);
645
646extern enum emulation_result kvm_mips_emulate_tlbmiss_st(u32 cause,
647 u32 *opc,
648 struct kvm_run *run,
649 struct kvm_vcpu *vcpu);
650
651extern enum emulation_result kvm_mips_emulate_tlbinv_st(u32 cause,
652 u32 *opc,
653 struct kvm_run *run,
654 struct kvm_vcpu *vcpu);
655
656extern enum emulation_result kvm_mips_emulate_tlbmod(u32 cause,
657 u32 *opc,
658 struct kvm_run *run,
659 struct kvm_vcpu *vcpu);
660
661extern enum emulation_result kvm_mips_emulate_fpu_exc(u32 cause,
662 u32 *opc,
663 struct kvm_run *run,
664 struct kvm_vcpu *vcpu);
665
666extern enum emulation_result kvm_mips_handle_ri(u32 cause,
667 u32 *opc,
668 struct kvm_run *run,
669 struct kvm_vcpu *vcpu);
670
671extern enum emulation_result kvm_mips_emulate_ri_exc(u32 cause,
672 u32 *opc,
673 struct kvm_run *run,
674 struct kvm_vcpu *vcpu);
675
676extern enum emulation_result kvm_mips_emulate_bp_exc(u32 cause,
677 u32 *opc,
678 struct kvm_run *run,
679 struct kvm_vcpu *vcpu);
680
681extern enum emulation_result kvm_mips_emulate_trap_exc(u32 cause,
682 u32 *opc,
683 struct kvm_run *run,
684 struct kvm_vcpu *vcpu);
685
686extern enum emulation_result kvm_mips_emulate_msafpe_exc(u32 cause,
687 u32 *opc,
688 struct kvm_run *run,
689 struct kvm_vcpu *vcpu);
690
691extern enum emulation_result kvm_mips_emulate_fpe_exc(u32 cause,
692 u32 *opc,
693 struct kvm_run *run,
694 struct kvm_vcpu *vcpu);
695
696extern enum emulation_result kvm_mips_emulate_msadis_exc(u32 cause,
697 u32 *opc,
698 struct kvm_run *run,
699 struct kvm_vcpu *vcpu);
700
701extern enum emulation_result kvm_mips_complete_mmio_load(struct kvm_vcpu *vcpu,
702 struct kvm_run *run);
703
704u32 kvm_mips_read_count(struct kvm_vcpu *vcpu);
705void kvm_mips_write_count(struct kvm_vcpu *vcpu, u32 count);
706void kvm_mips_write_compare(struct kvm_vcpu *vcpu, u32 compare, bool ack);
707void kvm_mips_init_count(struct kvm_vcpu *vcpu);
708int kvm_mips_set_count_ctl(struct kvm_vcpu *vcpu, s64 count_ctl);
709int kvm_mips_set_count_resume(struct kvm_vcpu *vcpu, s64 count_resume);
710int kvm_mips_set_count_hz(struct kvm_vcpu *vcpu, s64 count_hz);
711void kvm_mips_count_enable_cause(struct kvm_vcpu *vcpu);
712void kvm_mips_count_disable_cause(struct kvm_vcpu *vcpu);
713enum hrtimer_restart kvm_mips_count_timeout(struct kvm_vcpu *vcpu);
714
715enum emulation_result kvm_mips_check_privilege(u32 cause,
716 u32 *opc,
717 struct kvm_run *run,
718 struct kvm_vcpu *vcpu);
719
720enum emulation_result kvm_mips_emulate_cache(union mips_instruction inst,
721 u32 *opc,
722 u32 cause,
723 struct kvm_run *run,
724 struct kvm_vcpu *vcpu);
725enum emulation_result kvm_mips_emulate_CP0(union mips_instruction inst,
726 u32 *opc,
727 u32 cause,
728 struct kvm_run *run,
729 struct kvm_vcpu *vcpu);
730enum emulation_result kvm_mips_emulate_store(union mips_instruction inst,
731 u32 cause,
732 struct kvm_run *run,
733 struct kvm_vcpu *vcpu);
734enum emulation_result kvm_mips_emulate_load(union mips_instruction inst,
735 u32 cause,
736 struct kvm_run *run,
737 struct kvm_vcpu *vcpu);
738
739unsigned int kvm_mips_config1_wrmask(struct kvm_vcpu *vcpu);
740unsigned int kvm_mips_config3_wrmask(struct kvm_vcpu *vcpu);
741unsigned int kvm_mips_config4_wrmask(struct kvm_vcpu *vcpu);
742unsigned int kvm_mips_config5_wrmask(struct kvm_vcpu *vcpu);
743
744/* Dynamic binary translation */
745extern int kvm_mips_trans_cache_index(union mips_instruction inst,
746 u32 *opc, struct kvm_vcpu *vcpu);
747extern int kvm_mips_trans_cache_va(union mips_instruction inst, u32 *opc,
748 struct kvm_vcpu *vcpu);
749extern int kvm_mips_trans_mfc0(union mips_instruction inst, u32 *opc,
750 struct kvm_vcpu *vcpu);
751extern int kvm_mips_trans_mtc0(union mips_instruction inst, u32 *opc,
752 struct kvm_vcpu *vcpu);
753
754/* Misc */
755extern void kvm_mips_dump_stats(struct kvm_vcpu *vcpu);
756extern unsigned long kvm_mips_get_ramsize(struct kvm *kvm);
757
758static inline void kvm_arch_hardware_disable(void) {}
759static inline void kvm_arch_hardware_unsetup(void) {}
760static inline void kvm_arch_sync_events(struct kvm *kvm) {}
761static inline void kvm_arch_free_memslot(struct kvm *kvm,
762 struct kvm_memory_slot *free, struct kvm_memory_slot *dont) {}
763static inline void kvm_arch_memslots_updated(struct kvm *kvm, struct kvm_memslots *slots) {}
764static inline void kvm_arch_flush_shadow_all(struct kvm *kvm) {}
765static inline void kvm_arch_flush_shadow_memslot(struct kvm *kvm,
766 struct kvm_memory_slot *slot) {}
767static inline void kvm_arch_vcpu_uninit(struct kvm_vcpu *vcpu) {}
768static inline void kvm_arch_sched_in(struct kvm_vcpu *vcpu, int cpu) {}
769static inline void kvm_arch_vcpu_blocking(struct kvm_vcpu *vcpu) {}
770static inline void kvm_arch_vcpu_unblocking(struct kvm_vcpu *vcpu) {}
771static inline void kvm_arch_vcpu_block_finish(struct kvm_vcpu *vcpu) {}
772
773#endif /* __MIPS_KVM_HOST_H__ */