arm_cpu.cc revision 13611:c8b7847b4171
1/*
2 * Copyright (c) 2012 ARM Limited
3 * All rights reserved
4 *
5 * The license below extends only to copyright in the software and shall
6 * not be construed as granting a license to any other intellectual
7 * property including but not limited to intellectual property relating
8 * to a hardware implementation of the functionality of the software
9 * licensed hereunder.  You may use the software subject to the license
10 * terms below provided that you ensure that this notice is replicated
11 * unmodified and in its entirety in all distributions of the software,
12 * modified or unmodified, in source code or in binary form.
13 *
14 * Redistribution and use in source and binary forms, with or without
15 * modification, are permitted provided that the following conditions are
16 * met: redistributions of source code must retain the above copyright
17 * notice, this list of conditions and the following disclaimer;
18 * redistributions in binary form must reproduce the above copyright
19 * notice, this list of conditions and the following disclaimer in the
20 * documentation and/or other materials provided with the distribution;
21 * neither the name of the copyright holders nor the names of its
22 * contributors may be used to endorse or promote products derived from
23 * this software without specific prior written permission.
24 *
25 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
26 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
27 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
28 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
29 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
30 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
31 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
32 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
33 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
34 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
35 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
36 *
37 * Authors: Andreas Sandberg
38 */
39
40#include "arch/arm/kvm/arm_cpu.hh"
41
42#include <linux/kvm.h>
43
44#include <algorithm>
45#include <cerrno>
46#include <memory>
47
48#include "arch/registers.hh"
49#include "cpu/kvm/base.hh"
50#include "debug/Kvm.hh"
51#include "debug/KvmContext.hh"
52#include "debug/KvmInt.hh"
53#include "sim/pseudo_inst.hh"
54
55using namespace ArmISA;
56
57#define EXTRACT_FIELD(val, mask, shift)         \
58    (((val) & (mask)) >> (shift))
59
60#define REG_IS_ARM(id)                          \
61    (((id) & KVM_REG_ARCH_MASK) == KVM_REG_ARM)
62
63#define REG_IS_32BIT(id)                                \
64    (((id) & KVM_REG_SIZE_MASK) == KVM_REG_SIZE_U32)
65
66#define REG_IS_64BIT(id)                                \
67    (((id) & KVM_REG_SIZE_MASK) == KVM_REG_SIZE_U64)
68
69#define REG_IS_CP(id, cp)                       \
70    (((id) & KVM_REG_ARM_COPROC_MASK) == (cp))
71
72#define REG_IS_CORE(id) REG_IS_CP((id), KVM_REG_ARM_CORE)
73
74#define REG_IS_VFP(id) REG_IS_CP((id), KVM_REG_ARM_VFP)
75#define REG_VFP_REG(id) ((id) & KVM_REG_ARM_VFP_MASK)
76// HACK: These aren't really defined in any of the headers, so we'll
77// assume some reasonable values for now.
78#define REG_IS_VFP_REG(id) (REG_VFP_REG(id) < 0x100)
79#define REG_IS_VFP_CTRL(id) (REG_VFP_REG(id) >= 0x100)
80
81#define REG_IS_DEMUX(id) REG_IS_CP((id), KVM_REG_ARM_DEMUX)
82
83
84// There is no constant in the kernel headers defining the mask to use
85// to get the core register index. We'll just do what they do
86// internally.
87#define REG_CORE_IDX(id)                                                \
88    (~(KVM_REG_ARCH_MASK | KVM_REG_SIZE_MASK | KVM_REG_ARM_CORE))
89
90#define REG_CP(id)                                                      \
91    EXTRACT_FIELD(id, KVM_REG_ARM_COPROC_MASK, KVM_REG_ARM_COPROC_SHIFT)
92
93#define REG_CRN(id)                                                     \
94    EXTRACT_FIELD(id, KVM_REG_ARM_32_CRN_MASK, KVM_REG_ARM_32_CRN_SHIFT)
95
96#define REG_OPC1(id)                                                    \
97    EXTRACT_FIELD(id, KVM_REG_ARM_OPC1_MASK, KVM_REG_ARM_OPC1_SHIFT)
98
99#define REG_CRM(id)                                                     \
100    EXTRACT_FIELD(id, KVM_REG_ARM_CRM_MASK, KVM_REG_ARM_CRM_SHIFT)
101
102#define REG_OPC2(id)                                                    \
103    EXTRACT_FIELD(id, KVM_REG_ARM_32_OPC2_MASK, KVM_REG_ARM_32_OPC2_SHIFT)
104
105#define REG_CP32(cpnum, crn, opc1, crm, opc2) ( \
106        (KVM_REG_ARM | KVM_REG_SIZE_U32) |      \
107        ((cpnum) << KVM_REG_ARM_COPROC_SHIFT) | \
108        ((crn) << KVM_REG_ARM_32_CRN_SHIFT) |   \
109        ((opc1) << KVM_REG_ARM_OPC1_SHIFT) |    \
110        ((crm) << KVM_REG_ARM_CRM_SHIFT) |      \
111        ((opc2) << KVM_REG_ARM_32_OPC2_SHIFT))
112
113#define REG_CP64(cpnum, opc1, crm) (            \
114        (KVM_REG_ARM | KVM_REG_SIZE_U64) |      \
115        ((cpnum) << KVM_REG_ARM_COPROC_SHIFT) | \
116        ((opc1) << KVM_REG_ARM_OPC1_SHIFT) |    \
117        ((crm) << KVM_REG_ARM_CRM_SHIFT))
118
119#define REG_CORE32(kname) (                     \
120        (KVM_REG_ARM | KVM_REG_SIZE_U32) |      \
121        (KVM_REG_ARM_CORE) |                    \
122        (KVM_REG_ARM_CORE_REG(kname)))
123
124#define REG_VFP32(regno) (                      \
125        (KVM_REG_ARM | KVM_REG_SIZE_U32) |      \
126        KVM_REG_ARM_VFP | (regno))
127
128#define REG_VFP64(regno) (                      \
129        (KVM_REG_ARM | KVM_REG_SIZE_U64) |      \
130        KVM_REG_ARM_VFP | (regno))
131
132#define REG_DEMUX32(dmxid, val) (               \
133        (KVM_REG_ARM | KVM_REG_SIZE_U32) |      \
134        (dmxid) | (val))
135
136// Some of the co-processor registers are invariants and must have the
137// same value on both the host and the guest. We need to keep a list
138// of these to prevent gem5 from fiddling with them on the guest.
139static uint64_t invariant_reg_vector[] = {
140    REG_CP32(15, 0, 0, 0, 0), // MIDR
141    REG_CP32(15, 0, 0, 0, 1), // CTR
142    REG_CP32(15, 0, 0, 0, 2), // TCMTR
143    REG_CP32(15, 0, 0, 0, 3), // TLBTR
144    REG_CP32(15, 0, 0, 0, 6), // REVIDR
145
146    REG_CP32(15, 0, 0, 1, 0), // ID_PFR0
147    REG_CP32(15, 0, 0, 1, 1), // ID_PFR1
148    REG_CP32(15, 0, 0, 1, 2), // ID_DFR0
149    REG_CP32(15, 0, 0, 1, 3), // ID_AFR0
150    REG_CP32(15, 0, 0, 1, 4), // ID_MMFR0
151    REG_CP32(15, 0, 0, 1, 5), // ID_MMFR1
152    REG_CP32(15, 0, 0, 1, 6), // ID_MMFR2
153    REG_CP32(15, 0, 0, 1, 7), // ID_MMFR3
154
155    REG_CP32(15, 0, 0, 2, 0), // ID_ISAR0
156    REG_CP32(15, 0, 0, 2, 1), // ID_ISAR1
157    REG_CP32(15, 0, 0, 2, 2), // ID_ISAR2
158    REG_CP32(15, 0, 0, 2, 3), // ID_ISAR3
159    REG_CP32(15, 0, 0, 2, 4), // ID_ISAR4
160    REG_CP32(15, 0, 0, 2, 5), // ID_ISAR5
161
162    REG_CP32(15, 0, 1, 0, 0), // CSSIDR
163    REG_CP32(15, 0, 1, 0, 1), // CLIDR
164    REG_CP32(15, 0, 1, 0, 7), // AIDR
165
166    REG_VFP32(KVM_REG_ARM_VFP_MVFR0),
167    REG_VFP32(KVM_REG_ARM_VFP_MVFR1),
168    REG_VFP32(KVM_REG_ARM_VFP_FPSID),
169
170    REG_DEMUX32(KVM_REG_ARM_DEMUX_ID_CCSIDR, 0),
171};
172
173const static uint64_t KVM_REG64_TTBR0(REG_CP64(15, 0, 2));
174const static uint64_t KVM_REG64_TTBR1(REG_CP64(15, 1, 2));
175
176#define INTERRUPT_ID(type, vcpu, irq) (                    \
177        ((type) << KVM_ARM_IRQ_TYPE_SHIFT) |               \
178        ((vcpu) << KVM_ARM_IRQ_VCPU_SHIFT) |               \
179        ((irq) << KVM_ARM_IRQ_NUM_SHIFT))
180
181#define INTERRUPT_VCPU_IRQ(vcpu)                                \
182    INTERRUPT_ID(KVM_ARM_IRQ_TYPE_CPU, vcpu, KVM_ARM_IRQ_CPU_IRQ)
183
184#define INTERRUPT_VCPU_FIQ(vcpu)                                \
185    INTERRUPT_ID(KVM_ARM_IRQ_TYPE_CPU, vcpu, KVM_ARM_IRQ_CPU_FIQ)
186
187
188#define COUNT_OF(l) (sizeof(l) / sizeof(*l))
189
190const std::set<uint64_t> ArmKvmCPU::invariant_regs(
191    invariant_reg_vector,
192    invariant_reg_vector + COUNT_OF(invariant_reg_vector));
193
194
195ArmKvmCPU::KvmIntRegInfo ArmKvmCPU::kvmIntRegs[] = {
196    { REG_CORE32(usr_regs.ARM_r0), INTREG_R0, "R0" },
197    { REG_CORE32(usr_regs.ARM_r1), INTREG_R1, "R1" },
198    { REG_CORE32(usr_regs.ARM_r2), INTREG_R2, "R2" },
199    { REG_CORE32(usr_regs.ARM_r3), INTREG_R3, "R3" },
200    { REG_CORE32(usr_regs.ARM_r4), INTREG_R4, "R4" },
201    { REG_CORE32(usr_regs.ARM_r5), INTREG_R5, "R5" },
202    { REG_CORE32(usr_regs.ARM_r6), INTREG_R6, "R6" },
203    { REG_CORE32(usr_regs.ARM_r7), INTREG_R7, "R7" },
204    { REG_CORE32(usr_regs.ARM_r8), INTREG_R8, "R8" },
205    { REG_CORE32(usr_regs.ARM_r9), INTREG_R9, "R9" },
206    { REG_CORE32(usr_regs.ARM_r10), INTREG_R10, "R10" },
207    { REG_CORE32(usr_regs.ARM_fp), INTREG_R11, "R11" },
208    { REG_CORE32(usr_regs.ARM_ip), INTREG_R12, "R12" },
209    { REG_CORE32(usr_regs.ARM_sp), INTREG_R13, "R13(USR)" },
210    { REG_CORE32(usr_regs.ARM_lr), INTREG_R14, "R14(USR)" },
211
212    { REG_CORE32(svc_regs[0]), INTREG_SP_SVC, "R13(SVC)" },
213    { REG_CORE32(svc_regs[1]), INTREG_LR_SVC, "R14(SVC)" },
214
215    { REG_CORE32(abt_regs[0]), INTREG_SP_ABT, "R13(ABT)" },
216    { REG_CORE32(abt_regs[1]), INTREG_LR_ABT, "R14(ABT)" },
217
218    { REG_CORE32(und_regs[0]), INTREG_SP_UND, "R13(UND)" },
219    { REG_CORE32(und_regs[1]), INTREG_LR_UND, "R14(UND)" },
220
221    { REG_CORE32(irq_regs[0]), INTREG_SP_IRQ, "R13(IRQ)" },
222    { REG_CORE32(irq_regs[1]), INTREG_LR_IRQ, "R14(IRQ)" },
223
224
225    { REG_CORE32(fiq_regs[0]), INTREG_R8_FIQ, "R8(FIQ)" },
226    { REG_CORE32(fiq_regs[1]), INTREG_R9_FIQ, "R9(FIQ)" },
227    { REG_CORE32(fiq_regs[2]), INTREG_R10_FIQ, "R10(FIQ)" },
228    { REG_CORE32(fiq_regs[3]), INTREG_R11_FIQ, "R11(FIQ)" },
229    { REG_CORE32(fiq_regs[4]), INTREG_R12_FIQ, "R12(FIQ)" },
230    { REG_CORE32(fiq_regs[5]), INTREG_R13_FIQ, "R13(FIQ)" },
231    { REG_CORE32(fiq_regs[6]), INTREG_R14_FIQ, "R14(FIQ)" },
232    { 0, NUM_INTREGS, NULL }
233};
234
235ArmKvmCPU::KvmCoreMiscRegInfo ArmKvmCPU::kvmCoreMiscRegs[] = {
236    { REG_CORE32(usr_regs.ARM_cpsr), MISCREG_CPSR, "CPSR" },
237    { REG_CORE32(svc_regs[2]), MISCREG_SPSR_SVC, "SPSR(SVC)" },
238    { REG_CORE32(abt_regs[2]), MISCREG_SPSR_ABT, "SPSR(ABT)" },
239    { REG_CORE32(und_regs[2]), MISCREG_SPSR_UND, "SPSR(UND)" },
240    { REG_CORE32(irq_regs[2]), MISCREG_SPSR_IRQ, "SPSR(IRQ)" },
241    { REG_CORE32(fiq_regs[2]), MISCREG_SPSR_FIQ, "SPSR(FIQ)" },
242    { 0, NUM_MISCREGS }
243};
244
245ArmKvmCPU::ArmKvmCPU(ArmKvmCPUParams *params)
246    : BaseKvmCPU(params),
247      irqAsserted(false), fiqAsserted(false)
248{
249}
250
251ArmKvmCPU::~ArmKvmCPU()
252{
253}
254
255void
256ArmKvmCPU::startup()
257{
258    BaseKvmCPU::startup();
259
260    /* TODO: This needs to be moved when we start to support VMs with
261     * multiple threads since kvmArmVCpuInit requires that all CPUs in
262     * the VM have been created.
263     */
264    /* TODO: The CPU type needs to be configurable once KVM on ARM
265     * starts to support more CPUs.
266     */
267    kvmArmVCpuInit(KVM_ARM_TARGET_CORTEX_A15);
268}
269
270Tick
271ArmKvmCPU::kvmRun(Tick ticks)
272{
273    bool simFIQ(interrupts[0]->checkRaw(INT_FIQ));
274    bool simIRQ(interrupts[0]->checkRaw(INT_IRQ));
275
276    if (fiqAsserted != simFIQ) {
277        fiqAsserted = simFIQ;
278        DPRINTF(KvmInt, "KVM: Update FIQ state: %i\n", simFIQ);
279        vm.setIRQLine(INTERRUPT_VCPU_FIQ(vcpuID), simFIQ);
280    }
281    if (irqAsserted != simIRQ) {
282        irqAsserted = simIRQ;
283        DPRINTF(KvmInt, "KVM: Update IRQ state: %i\n", simIRQ);
284        vm.setIRQLine(INTERRUPT_VCPU_IRQ(vcpuID), simIRQ);
285    }
286
287    return BaseKvmCPU::kvmRun(ticks);
288}
289
290void
291ArmKvmCPU::dump()
292{
293    dumpKvmStateCore();
294    dumpKvmStateMisc();
295}
296
297void
298ArmKvmCPU::updateKvmState()
299{
300    DPRINTF(KvmContext, "Updating KVM state...\n");
301
302    updateKvmStateCore();
303    updateKvmStateMisc();
304}
305
306void
307ArmKvmCPU::updateThreadContext()
308{
309    DPRINTF(KvmContext, "Updating gem5 state...\n");
310
311    updateTCStateCore();
312    updateTCStateMisc();
313}
314
315Tick
316ArmKvmCPU::onKvmExitHypercall()
317{
318    ThreadContext *tc(getContext(0));
319    const uint32_t reg_ip(tc->readIntRegFlat(INTREG_R12));
320    const uint8_t func((reg_ip >> 8) & 0xFF);
321    const uint8_t subfunc(reg_ip & 0xFF);
322
323    DPRINTF(Kvm, "KVM Hypercall: 0x%x/0x%x\n", func, subfunc);
324    const uint64_t ret(PseudoInst::pseudoInst(getContext(0), func, subfunc));
325
326    // Just set the return value using the KVM API instead of messing
327    // with the context. We could have used the context, but that
328    // would have required us to request a full context sync.
329    setOneReg(REG_CORE32(usr_regs.ARM_r0), ret & 0xFFFFFFFF);
330    setOneReg(REG_CORE32(usr_regs.ARM_r1), (ret >> 32) & 0xFFFFFFFF);
331
332    return 0;
333}
334
335const ArmKvmCPU::RegIndexVector &
336ArmKvmCPU::getRegList() const
337{
338    if (_regIndexList.size() == 0) {
339        std::unique_ptr<struct kvm_reg_list> regs;
340        uint64_t i(1);
341
342        do {
343            i <<= 1;
344            regs.reset((struct kvm_reg_list *)
345                       operator new(sizeof(struct kvm_reg_list) +
346                                    i * sizeof(uint64_t)));
347            regs->n = i;
348        } while (!getRegList(*regs));
349        _regIndexList.assign(regs->reg,
350                             regs->reg + regs->n);
351    }
352
353    return _regIndexList;
354}
355
356void
357ArmKvmCPU::kvmArmVCpuInit(uint32_t target)
358{
359    struct kvm_vcpu_init init;
360
361    memset(&init, 0, sizeof(init));
362
363    init.target = target;
364
365    kvmArmVCpuInit(init);
366}
367
368void
369ArmKvmCPU::kvmArmVCpuInit(const struct kvm_vcpu_init &init)
370{
371    if (ioctl(KVM_ARM_VCPU_INIT, (void *)&init) == -1)
372        panic("KVM: Failed to initialize vCPU\n");
373}
374
375MiscRegIndex
376ArmKvmCPU::decodeCoProcReg(uint64_t id) const
377{
378    const unsigned cp(REG_CP(id));
379    const bool is_reg32(REG_IS_32BIT(id));
380    const bool is_reg64(REG_IS_64BIT(id));
381
382    // CP numbers larger than 15 are reserved for KVM extensions
383    if (cp > 15)
384        return NUM_MISCREGS;
385
386    const unsigned crm(REG_CRM(id));
387    const unsigned crn(REG_CRN(id));
388    const unsigned opc1(REG_OPC1(id));
389    const unsigned opc2(REG_OPC2(id));
390
391    if (is_reg32) {
392        switch (cp) {
393          case 14:
394            return decodeCP14Reg(crn, opc1, crm, opc2);
395
396          case 15:
397            return decodeCP15Reg(crn, opc1, crm, opc2);
398
399          default:
400            return NUM_MISCREGS;
401        }
402    } else if (is_reg64) {
403        return NUM_MISCREGS;
404    } else {
405        warn("Unhandled register length, register (0x%x) ignored.\n");
406        return NUM_MISCREGS;
407    }
408}
409
410ArmISA::MiscRegIndex
411ArmKvmCPU::decodeVFPCtrlReg(uint64_t id) const
412{
413    if (!REG_IS_ARM(id) || !REG_IS_VFP(id) || !REG_IS_VFP_CTRL(id))
414        return NUM_MISCREGS;
415
416    const unsigned vfp_reg(REG_VFP_REG(id));
417    switch (vfp_reg) {
418      case KVM_REG_ARM_VFP_FPSID: return MISCREG_FPSID;
419      case KVM_REG_ARM_VFP_FPSCR: return MISCREG_FPSCR;
420      case KVM_REG_ARM_VFP_MVFR0: return MISCREG_MVFR0;
421      case KVM_REG_ARM_VFP_MVFR1: return MISCREG_MVFR1;
422      case KVM_REG_ARM_VFP_FPEXC: return MISCREG_FPEXC;
423
424      case KVM_REG_ARM_VFP_FPINST:
425      case KVM_REG_ARM_VFP_FPINST2:
426        warn_once("KVM: FPINST not implemented.\n");
427        return NUM_MISCREGS;
428
429      default:
430        return NUM_MISCREGS;
431    }
432}
433
434bool
435ArmKvmCPU::isInvariantReg(uint64_t id)
436{
437    /* Mask away the value field from multiplexed registers, we assume
438     * that entire groups of multiplexed registers can be treated as
439     * invariant. */
440    if (REG_IS_ARM(id) && REG_IS_DEMUX(id))
441        id &= ~KVM_REG_ARM_DEMUX_VAL_MASK;
442
443    return invariant_regs.find(id) != invariant_regs.end();
444}
445
446bool
447ArmKvmCPU::getRegList(struct kvm_reg_list &regs) const
448{
449    if (ioctl(KVM_GET_REG_LIST, (void *)&regs) == -1) {
450        if (errno == E2BIG) {
451            return false;
452        } else {
453            panic("KVM: Failed to get vCPU register list (errno: %i)\n",
454                  errno);
455        }
456    } else {
457        return true;
458    }
459}
460
461void
462ArmKvmCPU::dumpKvmStateCore()
463{
464    /* Print core registers */
465    uint32_t pc(getOneRegU32(REG_CORE32(usr_regs.ARM_pc)));
466    inform("PC: 0x%x\n", pc);
467
468    for (const KvmIntRegInfo *ri(kvmIntRegs);
469         ri->idx != NUM_INTREGS; ++ri) {
470
471        uint32_t value(getOneRegU32(ri->id));
472        inform("%s: 0x%x\n", ri->name, value);
473    }
474
475    for (const KvmCoreMiscRegInfo *ri(kvmCoreMiscRegs);
476         ri->idx != NUM_MISCREGS; ++ri) {
477
478        uint32_t value(getOneRegU32(ri->id));
479        inform("%s: 0x%x\n", miscRegName[ri->idx], value);
480    }
481}
482
483void
484ArmKvmCPU::dumpKvmStateMisc()
485{
486    /* Print co-processor registers */
487    const RegIndexVector &reg_ids(getRegList());;
488    for (RegIndexVector::const_iterator it(reg_ids.begin());
489         it != reg_ids.end(); ++it) {
490        uint64_t id(*it);
491
492        if (REG_IS_ARM(id) && REG_CP(id) <= 15) {
493            dumpKvmStateCoProc(id);
494        } else if (REG_IS_ARM(id) && REG_IS_VFP(id)) {
495            dumpKvmStateVFP(id);
496        } else if (REG_IS_ARM(id) && REG_IS_DEMUX(id)) {
497            switch (id & KVM_REG_ARM_DEMUX_ID_MASK) {
498              case KVM_REG_ARM_DEMUX_ID_CCSIDR:
499                inform("CCSIDR [0x%x]: %s\n",
500                       EXTRACT_FIELD(id,
501                                     KVM_REG_ARM_DEMUX_VAL_MASK,
502                                     KVM_REG_ARM_DEMUX_VAL_SHIFT),
503                       getAndFormatOneReg(id));
504                break;
505              default:
506                inform("DEMUX [0x%x, 0x%x]: %s\n",
507                       EXTRACT_FIELD(id,
508                                     KVM_REG_ARM_DEMUX_ID_MASK,
509                                     KVM_REG_ARM_DEMUX_ID_SHIFT),
510                       EXTRACT_FIELD(id,
511                                     KVM_REG_ARM_DEMUX_VAL_MASK,
512                                     KVM_REG_ARM_DEMUX_VAL_SHIFT),
513                       getAndFormatOneReg(id));
514                break;
515            }
516        } else if (!REG_IS_CORE(id)) {
517            inform("0x%x: %s\n", id, getAndFormatOneReg(id));
518        }
519    }
520}
521
522void
523ArmKvmCPU::dumpKvmStateCoProc(uint64_t id)
524{
525    assert(REG_IS_ARM(id));
526    assert(REG_CP(id) <= 15);
527
528    if (REG_IS_32BIT(id)) {
529        // 32-bit co-proc registers
530        MiscRegIndex idx(decodeCoProcReg(id));
531        uint32_t value(getOneRegU32(id));
532
533        if (idx != NUM_MISCREGS &&
534            !(idx >= MISCREG_CP15_UNIMP_START && idx < MISCREG_CP15_END)) {
535            const char *name(miscRegName[idx]);
536            const unsigned m5_ne(tc->readMiscRegNoEffect(idx));
537            const unsigned m5_e(tc->readMiscReg(idx));
538            inform("CP%i: [CRn: c%i opc1: %.2i CRm: c%i opc2: %i inv: %i]: "
539                   "[%s]: 0x%x/0x%x\n",
540                   REG_CP(id), REG_CRN(id), REG_OPC1(id), REG_CRM(id),
541                   REG_OPC2(id), isInvariantReg(id),
542                   name, value, m5_e);
543            if (m5_e != m5_ne) {
544                inform("readMiscReg: %x, readMiscRegNoEffect: %x\n",
545                       m5_e, m5_ne);
546            }
547        } else {
548            const char *name(idx != NUM_MISCREGS ? miscRegName[idx] : "-");
549            inform("CP%i: [CRn: c%i opc1: %.2i CRm: c%i opc2: %i inv: %i]: [%s]: "
550                   "0x%x\n",
551                   REG_CP(id), REG_CRN(id), REG_OPC1(id), REG_CRM(id),
552                   REG_OPC2(id), isInvariantReg(id), name, value);
553        }
554    } else {
555        inform("CP%i: [CRn: c%i opc1: %.2i CRm: c%i opc2: %i inv: %i "
556               "len: 0x%x]: %s\n",
557               REG_CP(id), REG_CRN(id), REG_OPC1(id), REG_CRM(id),
558               REG_OPC2(id), isInvariantReg(id),
559               EXTRACT_FIELD(id, KVM_REG_SIZE_MASK, KVM_REG_SIZE_SHIFT),
560               getAndFormatOneReg(id));
561    }
562}
563
564void
565ArmKvmCPU::dumpKvmStateVFP(uint64_t id)
566{
567    assert(REG_IS_ARM(id));
568    assert(REG_IS_VFP(id));
569
570    if (REG_IS_VFP_REG(id)) {
571        const unsigned idx(id & KVM_REG_ARM_VFP_MASK);
572        inform("VFP reg %i: %s", idx, getAndFormatOneReg(id));
573    } else if (REG_IS_VFP_CTRL(id)) {
574        MiscRegIndex idx(decodeVFPCtrlReg(id));
575        if (idx != NUM_MISCREGS) {
576            inform("VFP [%s]: %s", miscRegName[idx], getAndFormatOneReg(id));
577        } else {
578            inform("VFP [0x%x]: %s", id, getAndFormatOneReg(id));
579        }
580    } else {
581        inform("VFP [0x%x]: %s", id, getAndFormatOneReg(id));
582    }
583}
584
585void
586ArmKvmCPU::updateKvmStateCore()
587{
588    for (const KvmIntRegInfo *ri(kvmIntRegs);
589         ri->idx != NUM_INTREGS; ++ri) {
590
591        uint64_t value(tc->readIntRegFlat(ri->idx));
592        DPRINTF(KvmContext, "kvm(%s) := 0x%x\n", ri->name, value);
593        setOneReg(ri->id, value);
594    }
595
596    DPRINTF(KvmContext, "kvm(PC) := 0x%x\n", tc->instAddr());
597    setOneReg(REG_CORE32(usr_regs.ARM_pc), tc->instAddr());
598
599    for (const KvmCoreMiscRegInfo *ri(kvmCoreMiscRegs);
600         ri->idx != NUM_MISCREGS; ++ri) {
601
602        uint64_t value(tc->readMiscReg(ri->idx));
603        DPRINTF(KvmContext, "kvm(%s) := 0x%x\n", ri->name, value);
604        setOneReg(ri->id, value);
605    }
606
607    if (DTRACE(KvmContext))
608        dumpKvmStateCore();
609}
610
611void
612ArmKvmCPU::updateKvmStateMisc()
613{
614    static bool warned(false); // We can't use warn_once since we want
615                               // to show /all/ registers
616
617    const RegIndexVector &regs(getRegList());
618
619    for (RegIndexVector::const_iterator it(regs.begin());
620         it != regs.end();
621         ++it) {
622
623        if (!REG_IS_ARM(*it)) {
624            if (!warned)
625                warn("Skipping non-ARM register: 0x%x\n", *it);
626        } else if (isInvariantReg(*it)) {
627            DPRINTF(Kvm, "Skipping invariant register: 0x%x\n", *it);
628        } else if (REG_IS_CORE(*it)) {
629            // Core registers are handled in updateKvmStateCore
630            continue;
631        } else if (REG_CP(*it) <= 15) {
632            updateKvmStateCoProc(*it, !warned);
633        } else if (REG_IS_VFP(*it)) {
634            updateKvmStateVFP(*it, !warned);
635        } else {
636            if (!warned) {
637                warn("Skipping register with unknown CP (%i) id: 0x%x\n",
638                     REG_CP(*it), *it);
639            }
640        }
641
642    }
643
644    warned = true;
645    if (DTRACE(KvmContext))
646        dumpKvmStateMisc();
647}
648
649void
650ArmKvmCPU::updateKvmStateCoProc(uint64_t id, bool show_warnings)
651{
652    MiscRegIndex reg(decodeCoProcReg(id));
653
654    assert(REG_IS_ARM(id));
655    assert(REG_CP(id) <= 15);
656
657    if (id == KVM_REG64_TTBR0 || id == KVM_REG64_TTBR1) {
658        // HACK HACK HACK: Workaround for 64-bit TTBRx
659        reg = (id == KVM_REG64_TTBR0 ? MISCREG_TTBR0 : MISCREG_TTBR1);
660        if (show_warnings)
661            hack("KVM: 64-bit TTBBRx workaround\n");
662    }
663
664    if (reg == NUM_MISCREGS) {
665        if (show_warnings) {
666            warn("KVM: Ignoring unknown KVM co-processor register (0x%.8x):\n",
667                 id);
668            warn("\t0x%x: [CP: %i 64: %i CRn: c%i opc1: %.2i CRm: c%i"
669                 " opc2: %i]\n",
670                 id, REG_CP(id), REG_IS_64BIT(id), REG_CRN(id),
671                 REG_OPC1(id), REG_CRM(id), REG_OPC2(id));
672        }
673    } else if (reg >= MISCREG_CP15_UNIMP_START && reg < MISCREG_CP15_END) {
674        if (show_warnings)
675            warn("KVM: Co-processor reg. %s not implemented by gem5.\n",
676                 miscRegName[reg]);
677    } else {
678        setOneReg(id, tc->readMiscRegNoEffect(reg));
679    }
680}
681
682
683void
684ArmKvmCPU::updateKvmStateVFP(uint64_t id, bool show_warnings)
685{
686    assert(REG_IS_ARM(id));
687    assert(REG_IS_VFP(id));
688
689    if (REG_IS_VFP_REG(id)) {
690        if (!REG_IS_64BIT(id)) {
691            if (show_warnings)
692                warn("Unexpected VFP register length (reg: 0x%x).\n", id);
693            return;
694        }
695        const unsigned idx(id & KVM_REG_ARM_VFP_MASK);
696        const unsigned idx_base(idx << 1);
697        const unsigned idx_hi(idx_base + 1);
698        const unsigned idx_lo(idx_base + 0);
699        uint64_t value(
700            ((uint64_t)tc->readFloatRegFlat(idx_hi) << 32) |
701            tc->readFloatRegFlat(idx_lo));
702
703        setOneReg(id, value);
704    } else if (REG_IS_VFP_CTRL(id)) {
705        MiscRegIndex idx(decodeVFPCtrlReg(id));
706        if (idx == NUM_MISCREGS) {
707            if (show_warnings)
708                warn("Unhandled VFP control register: 0x%x\n", id);
709            return;
710        }
711        if (!REG_IS_32BIT(id)) {
712            if (show_warnings)
713                warn("Ignoring VFP control register (%s) with "
714                     "unexpected size.\n",
715                     miscRegName[idx]);
716            return;
717        }
718        setOneReg(id, (uint32_t)tc->readMiscReg(idx));
719    } else {
720        if (show_warnings)
721            warn("Unhandled VFP register: 0x%x\n", id);
722    }
723}
724
725void
726ArmKvmCPU::updateTCStateCore()
727{
728    for (const KvmIntRegInfo *ri(kvmIntRegs);
729         ri->idx != NUM_INTREGS; ++ri) {
730
731        tc->setIntRegFlat(ri->idx, getOneRegU32(ri->id));
732    }
733
734    for (const KvmCoreMiscRegInfo *ri(kvmCoreMiscRegs);
735         ri->idx != NUM_MISCREGS; ++ri) {
736
737        tc->setMiscRegNoEffect(ri->idx, getOneRegU32(ri->id));
738    }
739
740    /* We want the simulator to execute all side-effects of the CPSR
741     * update since this updates PC state and register maps.
742     */
743    tc->setMiscReg(MISCREG_CPSR, tc->readMiscRegNoEffect(MISCREG_CPSR));
744
745    // We update the PC state after we have updated the CPSR the
746    // contents of the CPSR affects how the npc is updated.
747    PCState pc(tc->pcState());
748    pc.set(getOneRegU32(REG_CORE32(usr_regs.ARM_pc)));
749    tc->pcState(pc);
750
751    if (DTRACE(KvmContext))
752        dumpKvmStateCore();
753}
754
755void
756ArmKvmCPU::updateTCStateMisc()
757{
758    static bool warned(false); // We can't use warn_once since we want
759                               // to show /all/ registers
760
761    const RegIndexVector &reg_ids(getRegList());;
762    for (RegIndexVector::const_iterator it(reg_ids.begin());
763         it != reg_ids.end(); ++it) {
764
765        if (!REG_IS_ARM(*it)) {
766            if (!warned)
767                warn("Skipping non-ARM register: 0x%x\n", *it);
768        } else if (REG_IS_CORE(*it)) {
769            // Core registers are handled in updateKvmStateCore
770        } else if (REG_CP(*it) <= 15) {
771            updateTCStateCoProc(*it, !warned);
772        } else if (REG_IS_VFP(*it)) {
773            updateTCStateVFP(*it, !warned);
774        } else {
775            if (!warned) {
776                warn("Skipping register with unknown CP (%i) id: 0x%x\n",
777                     REG_CP(*it), *it);
778            }
779        }
780    }
781
782    warned = true;
783
784    if (DTRACE(KvmContext))
785        dumpKvmStateMisc();
786}
787
788void
789ArmKvmCPU::updateTCStateCoProc(uint64_t id, bool show_warnings)
790{
791    MiscRegIndex reg(decodeCoProcReg(id));
792
793    assert(REG_IS_ARM(id));
794    assert(REG_CP(id) <= 15);
795
796    if (id == KVM_REG64_TTBR0 || id == KVM_REG64_TTBR1) {
797        // HACK HACK HACK: We don't currently support 64-bit TTBR0/TTBR1
798        hack_once("KVM: 64-bit TTBRx workaround\n");
799        tc->setMiscRegNoEffect(
800            id == KVM_REG64_TTBR0 ? MISCREG_TTBR0 : MISCREG_TTBR1,
801            (uint32_t)(getOneRegU64(id) & 0xFFFFFFFF));
802    } else if (reg == MISCREG_TTBCR) {
803        uint32_t value(getOneRegU64(id));
804        if (value & 0x80000000)
805            panic("KVM: Guest tried to enable LPAE.\n");
806        tc->setMiscRegNoEffect(reg, value);
807    } else if (reg == NUM_MISCREGS) {
808        if (show_warnings) {
809            warn("KVM: Ignoring unknown KVM co-processor register:\n", id);
810            warn("\t0x%x: [CP: %i 64: %i CRn: c%i opc1: %.2i CRm: c%i"
811                 " opc2: %i]\n",
812                 id, REG_CP(id), REG_IS_64BIT(id), REG_CRN(id),
813                 REG_OPC1(id), REG_CRM(id), REG_OPC2(id));
814        }
815    } else if (reg >= MISCREG_CP15_UNIMP_START && reg < MISCREG_CP15_END) {
816        if (show_warnings)
817            warn_once("KVM: Co-processor reg. %s not implemented by gem5.\n",
818                      miscRegName[reg]);
819    } else {
820        tc->setMiscRegNoEffect(reg, getOneRegU32(id));
821    }
822}
823
824void
825ArmKvmCPU::updateTCStateVFP(uint64_t id, bool show_warnings)
826{
827    assert(REG_IS_ARM(id));
828    assert(REG_IS_VFP(id));
829
830    if (REG_IS_VFP_REG(id)) {
831        if (!REG_IS_64BIT(id)) {
832            if (show_warnings)
833                warn("Unexpected VFP register length (reg: 0x%x).\n", id);
834            return;
835        }
836        const unsigned idx(id & KVM_REG_ARM_VFP_MASK);
837        const unsigned idx_base(idx << 1);
838        const unsigned idx_hi(idx_base + 1);
839        const unsigned idx_lo(idx_base + 0);
840        uint64_t value(getOneRegU64(id));
841
842        tc->setFloatRegFlat(idx_hi, (value >> 32) & 0xFFFFFFFF);
843        tc->setFloatRegFlat(idx_lo, value & 0xFFFFFFFF);
844    } else if (REG_IS_VFP_CTRL(id)) {
845        MiscRegIndex idx(decodeVFPCtrlReg(id));
846        if (idx == NUM_MISCREGS) {
847            if (show_warnings)
848                warn("Unhandled VFP control register: 0x%x\n", id);
849            return;
850        }
851        if (!REG_IS_32BIT(id)) {
852            if (show_warnings)
853                warn("Ignoring VFP control register (%s) with "
854                     "unexpected size.\n",
855                     miscRegName[idx]);
856            return;
857        }
858        tc->setMiscReg(idx, getOneRegU64(id));
859    } else {
860        if (show_warnings)
861            warn("Unhandled VFP register: 0x%x\n", id);
862    }
863}
864
865ArmKvmCPU *
866ArmKvmCPUParams::create()
867{
868    return new ArmKvmCPU(this);
869}
870