diff options
Diffstat (limited to 'src/arch/arm')
| -rw-r--r-- | src/arch/arm/kvm/ArmV8KvmCPU.py | 43 | ||||
| -rw-r--r-- | src/arch/arm/kvm/BaseArmKvmCPU.py | 44 | ||||
| -rw-r--r-- | src/arch/arm/kvm/SConscript | 6 | ||||
| -rw-r--r-- | src/arch/arm/kvm/armv8_cpu.cc | 326 | ||||
| -rw-r--r-- | src/arch/arm/kvm/armv8_cpu.hh | 140 | ||||
| -rw-r--r-- | src/arch/arm/kvm/base_cpu.cc | 154 | ||||
| -rw-r--r-- | src/arch/arm/kvm/base_cpu.hh | 111 |
7 files changed, 824 insertions, 0 deletions
diff --git a/src/arch/arm/kvm/ArmV8KvmCPU.py b/src/arch/arm/kvm/ArmV8KvmCPU.py new file mode 100644 index 000000000..13cf2d4db --- /dev/null +++ b/src/arch/arm/kvm/ArmV8KvmCPU.py @@ -0,0 +1,43 @@ +# Copyright (c) 2015 ARM Limited +# All rights reserved. +# +# The license below extends only to copyright in the software and shall +# not be construed as granting a license to any other intellectual +# property including but not limited to intellectual property relating +# to a hardware implementation of the functionality of the software +# licensed hereunder. You may use the software subject to the license +# terms below provided that you ensure that this notice is replicated +# unmodified and in its entirety in all distributions of the software, +# modified or unmodified, in source code or in binary form. +# +# Redistribution and use in source and binary forms, with or without +# modification, are permitted provided that the following conditions are +# met: redistributions of source code must retain the above copyright +# notice, this list of conditions and the following disclaimer; +# redistributions in binary form must reproduce the above copyright +# notice, this list of conditions and the following disclaimer in the +# documentation and/or other materials provided with the distribution; +# neither the name of the copyright holders nor the names of its +# contributors may be used to endorse or promote products derived from +# this software without specific prior written permission. +# +# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS +# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT +# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR +# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT +# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, +# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT +# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, +# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY +# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT +# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE +# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. +# +# Authors: Andreas Sandberg + +from m5.params import * +from BaseArmKvmCPU import BaseArmKvmCPU + +class ArmV8KvmCPU(BaseArmKvmCPU): + type = 'ArmV8KvmCPU' + cxx_header = "arch/arm/kvm/armv8_cpu.hh" diff --git a/src/arch/arm/kvm/BaseArmKvmCPU.py b/src/arch/arm/kvm/BaseArmKvmCPU.py new file mode 100644 index 000000000..f29c81190 --- /dev/null +++ b/src/arch/arm/kvm/BaseArmKvmCPU.py @@ -0,0 +1,44 @@ +# Copyright (c) 2015 ARM Limited +# All rights reserved. +# +# The license below extends only to copyright in the software and shall +# not be construed as granting a license to any other intellectual +# property including but not limited to intellectual property relating +# to a hardware implementation of the functionality of the software +# licensed hereunder. You may use the software subject to the license +# terms below provided that you ensure that this notice is replicated +# unmodified and in its entirety in all distributions of the software, +# modified or unmodified, in source code or in binary form. +# +# Redistribution and use in source and binary forms, with or without +# modification, are permitted provided that the following conditions are +# met: redistributions of source code must retain the above copyright +# notice, this list of conditions and the following disclaimer; +# redistributions in binary form must reproduce the above copyright +# notice, this list of conditions and the following disclaimer in the +# documentation and/or other materials provided with the distribution; +# neither the name of the copyright holders nor the names of its +# contributors may be used to endorse or promote products derived from +# this software without specific prior written permission. +# +# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS +# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT +# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR +# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT +# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, +# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT +# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, +# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY +# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT +# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE +# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. +# +# Authors: Andreas Sandberg + +from m5.params import * +from BaseKvmCPU import BaseKvmCPU + +class BaseArmKvmCPU(BaseKvmCPU): + type = 'BaseArmKvmCPU' + cxx_header = "arch/arm/kvm/base_cpu.hh" + abstract = True diff --git a/src/arch/arm/kvm/SConscript b/src/arch/arm/kvm/SConscript index 185aac7b6..a8a2d2dc8 100644 --- a/src/arch/arm/kvm/SConscript +++ b/src/arch/arm/kvm/SConscript @@ -48,6 +48,12 @@ host_isa = platform.machine() SimObject('KvmGic.py') Source('gic.cc') +SimObject('BaseArmKvmCPU.py') +Source('base_cpu.cc') + if host_isa == "armv7l": SimObject('ArmKvmCPU.py') Source('arm_cpu.cc') +elif host_isa == "aarch64": + SimObject('ArmV8KvmCPU.py') + Source('armv8_cpu.cc') diff --git a/src/arch/arm/kvm/armv8_cpu.cc b/src/arch/arm/kvm/armv8_cpu.cc new file mode 100644 index 000000000..071d27dd0 --- /dev/null +++ b/src/arch/arm/kvm/armv8_cpu.cc @@ -0,0 +1,326 @@ +/* + * Copyright (c) 2015 ARM Limited + * All rights reserved + * + * The license below extends only to copyright in the software and shall + * not be construed as granting a license to any other intellectual + * property including but not limited to intellectual property relating + * to a hardware implementation of the functionality of the software + * licensed hereunder. You may use the software subject to the license + * terms below provided that you ensure that this notice is replicated + * unmodified and in its entirety in all distributions of the software, + * modified or unmodified, in source code or in binary form. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions are + * met: redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer; + * redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution; + * neither the name of the copyright holders nor the names of its + * contributors may be used to endorse or promote products derived from + * this software without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS + * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT + * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR + * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT + * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, + * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT + * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, + * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY + * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT + * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE + * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + * + * Authors: Andreas Sandberg + */ + +#include "arch/arm/kvm/armv8_cpu.hh" + +#include <linux/kvm.h> + +#include "debug/KvmContext.hh" +#include "params/ArmV8KvmCPU.hh" + +// Unlike gem5, kvm doesn't count the SP as a normal integer register, +// which means we only have 31 normal integer registers. +constexpr static unsigned NUM_XREGS = NUM_ARCH_INTREGS - 1; +static_assert(NUM_XREGS == 31, "Unexpected number of aarch64 int. regs."); + +// The KVM interface accesses vector registers of 4 single precision +// floats instead of individual registers. +constexpr static unsigned NUM_QREGS = NumFloatV8ArchRegs / 4; +static_assert(NUM_QREGS == 32, "Unexpected number of aarch64 vector regs."); + +#define EXTRACT_FIELD(v, name) \ + (((v) & name ## _MASK) >> name ## _SHIFT) + +#define CORE_REG(name, size) \ + (KVM_REG_ARM64 | KVM_REG_ARM_CORE | \ + KVM_REG_SIZE_ ## size | \ + KVM_REG_ARM_CORE_REG(name)) + +#define INT_REG(name) CORE_REG(name, U64) +#define SIMD_REG(name) CORE_REG(name, U128) + +constexpr uint64_t +kvmXReg(const int num) +{ + return INT_REG(regs.regs[0]) + + (INT_REG(regs.regs[1]) - INT_REG(regs.regs[0])) * num; +} + +constexpr uint64_t +kvmFPReg(const int num) +{ + return SIMD_REG(fp_regs.vregs[0]) + + (SIMD_REG(fp_regs.vregs[1]) - SIMD_REG(fp_regs.vregs[0])) * num; +} + +union KvmFPReg { + union { + uint32_t i; + float f; + } s[4]; + + union { + uint64_t i; + double f; + } d[2]; + + uint8_t data[32]; +}; + +#define FP_REGS_PER_VFP_REG 4 +static_assert(sizeof(FloatRegBits) == 4, "Unexpected float reg size"); + +const std::vector<ArmV8KvmCPU::IntRegInfo> ArmV8KvmCPU::intRegMap = { + { INT_REG(regs.sp), INTREG_SP0, "SP(EL0)" }, + { INT_REG(sp_el1), INTREG_SP1, "SP(EL1)" }, +}; + +const std::vector<ArmV8KvmCPU::MiscRegInfo> ArmV8KvmCPU::miscRegMap = { + MiscRegInfo(INT_REG(regs.pstate), MISCREG_CPSR, "PSTATE"), + MiscRegInfo(INT_REG(elr_el1), MISCREG_ELR_EL1, "ELR(EL1)"), + MiscRegInfo(INT_REG(spsr[KVM_SPSR_EL1]), MISCREG_SPSR_EL1, "SPSR(EL1)"), + MiscRegInfo(INT_REG(spsr[KVM_SPSR_ABT]), MISCREG_SPSR_ABT, "SPSR(ABT)"), + MiscRegInfo(INT_REG(spsr[KVM_SPSR_UND]), MISCREG_SPSR_UND, "SPSR(UND)"), + MiscRegInfo(INT_REG(spsr[KVM_SPSR_IRQ]), MISCREG_SPSR_IRQ, "SPSR(IRQ)"), + MiscRegInfo(INT_REG(spsr[KVM_SPSR_FIQ]), MISCREG_SPSR_FIQ, "SPSR(FIQ)"), + MiscRegInfo(INT_REG(fp_regs.fpsr), MISCREG_FPSR, "FPSR"), + MiscRegInfo(INT_REG(fp_regs.fpcr), MISCREG_FPCR, "FPCR"), +}; + +ArmV8KvmCPU::ArmV8KvmCPU(ArmV8KvmCPUParams *params) + : BaseArmKvmCPU(params) +{ +} + +ArmV8KvmCPU::~ArmV8KvmCPU() +{ +} + +void +ArmV8KvmCPU::dump() +{ + inform("Integer registers:\n"); + inform(" PC: %s\n", getAndFormatOneReg(INT_REG(regs.pc))); + for (int i = 0; i < NUM_XREGS; ++i) + inform(" X%i: %s\n", i, getAndFormatOneReg(kvmXReg(i))); + + for (int i = 0; i < NUM_QREGS; ++i) + inform(" Q%i: %s\n", i, getAndFormatOneReg(kvmFPReg(i))); + + for (const auto &ri : intRegMap) + inform(" %s: %s\n", ri.name, getAndFormatOneReg(ri.kvm)); + + for (const auto &ri : miscRegMap) + inform(" %s: %s\n", ri.name, getAndFormatOneReg(ri.kvm)); + + for (const auto ® : getRegList()) { + const uint64_t arch(reg & KVM_REG_ARCH_MASK); + if (arch != KVM_REG_ARM64) { + inform("0x%x: %s\n", reg, getAndFormatOneReg(reg)); + continue; + } + + const uint64_t type(reg & KVM_REG_ARM_COPROC_MASK); + switch (type) { + case KVM_REG_ARM_CORE: + // These have already been printed + break; + + case KVM_REG_ARM64_SYSREG: { + const uint64_t op0(EXTRACT_FIELD(reg, KVM_REG_ARM64_SYSREG_OP0)); + const uint64_t op1(EXTRACT_FIELD(reg, KVM_REG_ARM64_SYSREG_OP1)); + const uint64_t crn(EXTRACT_FIELD(reg, KVM_REG_ARM64_SYSREG_CRN)); + const uint64_t crm(EXTRACT_FIELD(reg, KVM_REG_ARM64_SYSREG_CRM)); + const uint64_t op2(EXTRACT_FIELD(reg, KVM_REG_ARM64_SYSREG_OP2)); + const MiscRegIndex idx( + decodeAArch64SysReg(op0, op1, crn, crm, op2)); + + inform(" %s (op0: %i, op1: %i, crn: %i, crm: %i, op2: %i): %s", + miscRegName[idx], op0, op1, crn, crm, op2, + getAndFormatOneReg(reg)); + } break; + + case KVM_REG_ARM_DEMUX: { + const uint64_t id(EXTRACT_FIELD(reg, KVM_REG_ARM_DEMUX_ID)); + const uint64_t val(EXTRACT_FIELD(reg, KVM_REG_ARM_DEMUX_VAL)); + if (id == KVM_REG_ARM_DEMUX_ID_CCSIDR) { + inform(" CSSIDR[%i]: %s\n", val, + getAndFormatOneReg(reg)); + } else { + inform(" UNKNOWN[%i:%i]: %s\n", id, val, + getAndFormatOneReg(reg)); + } + } break; + + default: + inform("0x%x: %s\n", reg, getAndFormatOneReg(reg)); + } + } +} + +void +ArmV8KvmCPU::updateKvmState() +{ + DPRINTF(KvmContext, "In updateKvmState():\n"); + for (const auto &ri : miscRegMap) { + const uint64_t value(tc->readMiscReg(ri.idx)); + DPRINTF(KvmContext, " %s := 0x%x\n", ri.name, value); + setOneReg(ri.kvm, value); + } + + for (int i = 0; i < NUM_XREGS; ++i) { + const uint64_t value(tc->readIntReg(INTREG_X0 + i)); + DPRINTF(KvmContext, " X%i := 0x%x\n", i, value); + setOneReg(kvmXReg(i), value); + } + + for (const auto &ri : intRegMap) { + const uint64_t value(tc->readIntReg(ri.idx)); + DPRINTF(KvmContext, " %s := 0x%x\n", ri.name, value); + setOneReg(ri.kvm, value); + } + + for (int i = 0; i < NUM_QREGS; ++i) { + const RegIndex reg_base(i * FP_REGS_PER_VFP_REG); + KvmFPReg reg; + for (int j = 0; j < FP_REGS_PER_VFP_REG; j++) + reg.s[j].i = tc->readFloatRegBits(reg_base + j); + + setOneReg(kvmFPReg(i), reg.data); + DPRINTF(KvmContext, " Q%i: %s\n", i, getAndFormatOneReg(kvmFPReg(i))); + } + + for (const auto &ri : getSysRegMap()) { + const uint64_t value(tc->readMiscReg(ri.idx)); + DPRINTF(KvmContext, " %s := 0x%x\n", ri.name, value); + setOneReg(ri.kvm, value); + } + + setOneReg(INT_REG(regs.pc), tc->instAddr()); + DPRINTF(KvmContext, " PC := 0x%x\n", tc->instAddr()); +} + +void +ArmV8KvmCPU::updateThreadContext() +{ + DPRINTF(KvmContext, "In updateThreadContext():\n"); + + // Update core misc regs first as they (particularly PSTATE/CPSR) + // affect how other registers are mapped. + for (const auto &ri : miscRegMap) { + const auto value(getOneRegU64(ri.kvm)); + DPRINTF(KvmContext, " %s := 0x%x\n", ri.name, value); + tc->setMiscRegNoEffect(ri.idx, value); + } + + for (int i = 0; i < NUM_XREGS; ++i) { + const auto value(getOneRegU64(kvmXReg(i))); + DPRINTF(KvmContext, " X%i := 0x%x\n", i, value); + tc->setIntReg(INTREG_X0 + i, value); + } + + for (const auto &ri : intRegMap) { + const auto value(getOneRegU64(ri.kvm)); + DPRINTF(KvmContext, " %s := 0x%x\n", ri.name, value); + tc->setIntReg(ri.idx, value); + } + + for (int i = 0; i < NUM_QREGS; ++i) { + const RegIndex reg_base(i * FP_REGS_PER_VFP_REG); + KvmFPReg reg; + DPRINTF(KvmContext, " Q%i: %s\n", i, getAndFormatOneReg(kvmFPReg(i))); + getOneReg(kvmFPReg(i), reg.data); + for (int j = 0; j < FP_REGS_PER_VFP_REG; j++) + tc->setFloatRegBits(reg_base + j, reg.s[j].i); + } + + for (const auto &ri : getSysRegMap()) { + const auto value(getOneRegU64(ri.kvm)); + DPRINTF(KvmContext, " %s := 0x%x\n", ri.name, value); + tc->setMiscRegNoEffect(ri.idx, value); + } + + const CPSR cpsr(tc->readMiscRegNoEffect(MISCREG_CPSR)); + PCState pc(getOneRegU64(INT_REG(regs.pc))); + pc.aarch64(inAArch64(tc)); + pc.thumb(cpsr.t); + pc.nextAArch64(inAArch64(tc)); + // TODO: This is a massive assumption that will break when + // switching to thumb. + pc.nextThumb(cpsr.t); + DPRINTF(KvmContext, " PC := 0x%x (t: %i, a64: %i)\n", + pc.instAddr(), pc.thumb(), pc.aarch64()); + tc->pcState(pc); +} + +const std::vector<ArmV8KvmCPU::MiscRegInfo> & +ArmV8KvmCPU::getSysRegMap() const +{ + // Try to use the cached map + if (!sysRegMap.empty()) + return sysRegMap; + + for (const auto ® : getRegList()) { + const uint64_t arch(reg & KVM_REG_ARCH_MASK); + if (arch != KVM_REG_ARM64) + continue; + + const uint64_t type(reg & KVM_REG_ARM_COPROC_MASK); + if (type != KVM_REG_ARM64_SYSREG) + continue; + + const uint64_t op0(EXTRACT_FIELD(reg, KVM_REG_ARM64_SYSREG_OP0)); + const uint64_t op1(EXTRACT_FIELD(reg, KVM_REG_ARM64_SYSREG_OP1)); + const uint64_t crn(EXTRACT_FIELD(reg, KVM_REG_ARM64_SYSREG_CRN)); + const uint64_t crm(EXTRACT_FIELD(reg, KVM_REG_ARM64_SYSREG_CRM)); + const uint64_t op2(EXTRACT_FIELD(reg, KVM_REG_ARM64_SYSREG_OP2)); + const MiscRegIndex idx(decodeAArch64SysReg(op0, op1, crn, crm, op2)); + const auto &info(miscRegInfo[idx]); + const bool writeable( + info[MISCREG_USR_NS_WR] || info[MISCREG_USR_S_WR] || + info[MISCREG_PRI_S_WR] || info[MISCREG_PRI_NS_WR] || + info[MISCREG_HYP_WR] || + info[MISCREG_MON_NS0_WR] || info[MISCREG_MON_NS1_WR]); + const bool implemented( + info[MISCREG_IMPLEMENTED] || info[MISCREG_WARN_NOT_FAIL]); + + // Only add implemented registers that we are going to be able + // to write. + if (implemented && writeable) + sysRegMap.emplace_back(reg, idx, miscRegName[idx]); + } + + return sysRegMap; +} + +ArmV8KvmCPU * +ArmV8KvmCPUParams::create() +{ + return new ArmV8KvmCPU(this); +} diff --git a/src/arch/arm/kvm/armv8_cpu.hh b/src/arch/arm/kvm/armv8_cpu.hh new file mode 100644 index 000000000..97127b471 --- /dev/null +++ b/src/arch/arm/kvm/armv8_cpu.hh @@ -0,0 +1,140 @@ +/* + * Copyright (c) 2015 ARM Limited + * All rights reserved + * + * The license below extends only to copyright in the software and shall + * not be construed as granting a license to any other intellectual + * property including but not limited to intellectual property relating + * to a hardware implementation of the functionality of the software + * licensed hereunder. You may use the software subject to the license + * terms below provided that you ensure that this notice is replicated + * unmodified and in its entirety in all distributions of the software, + * modified or unmodified, in source code or in binary form. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions are + * met: redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer; + * redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution; + * neither the name of the copyright holders nor the names of its + * contributors may be used to endorse or promote products derived from + * this software without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS + * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT + * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR + * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT + * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, + * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT + * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, + * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY + * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT + * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE + * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + * + * Authors: Andreas Sandberg + */ + +#ifndef __ARCH_ARM_KVM_ARMV8_CPU_HH__ +#define __ARCH_ARM_KVM_ARMV8_CPU_HH__ + +#include <vector> + +#include "arch/arm/intregs.hh" +#include "arch/arm/kvm/base_cpu.hh" +#include "arch/arm/miscregs.hh" + +struct ArmV8KvmCPUParams; + +/** + * This is an implementation of a KVM-based ARMv8-compatible CPU. + * + * Known limitations: + * <ul> + * + * <li>The system-register-based generic timer can only be simulated + * by the host kernel. Workaround: Use a memory mapped timer + * instead to simulate the timer in gem5. + * + * <li>Simulating devices (e.g., the generic timer) in the host + * kernel requires that the host kernel also simulates the + * GIC. + * + * <li>ID registers in the host and in gem5 must match for switching + * between simulated CPUs and KVM. This is particularly + * important for ID registers describing memory system + * capabilities (e.g., ASID size, physical address size). + * + * <li>Switching between a virtualized CPU and a simulated CPU is + * currently not supported if in-kernel device emulation is + * used. This could be worked around by adding support for + * switching to the gem5 (e.g., the KvmGic) side of the device + * models. A simpler workaround is to avoid in-kernel device + * models altogether. + * + * </ul> + * + */ +class ArmV8KvmCPU : public BaseArmKvmCPU +{ + public: + ArmV8KvmCPU(ArmV8KvmCPUParams *params); + virtual ~ArmV8KvmCPU(); + + void dump() M5_ATTR_OVERRIDE; + + protected: + void updateKvmState() M5_ATTR_OVERRIDE; + void updateThreadContext() M5_ATTR_OVERRIDE; + + protected: + /** Mapping between integer registers in gem5 and KVM */ + struct IntRegInfo { + IntRegInfo(uint64_t _kvm, IntRegIndex _idx, const char *_name) + : kvm(_kvm), idx(_idx), name(_name) {} + + /** Register index in KVM */ + uint64_t kvm; + /** Register index in gem5 */ + IntRegIndex idx; + /** Name to use in debug dumps */ + const char *name; + }; + + /** Mapping between misc registers in gem5 and registers in KVM */ + struct MiscRegInfo { + MiscRegInfo(uint64_t _kvm, MiscRegIndex _idx, const char *_name) + : kvm(_kvm), idx(_idx), name(_name) {} + + /** Register index in KVM */ + uint64_t kvm; + /** Register index in gem5 */ + MiscRegIndex idx; + /** Name to use in debug dumps */ + const char *name; + }; + + /** + * Get a map between system registers in kvm and gem5 registers + * + * This method returns a mapping between system registers in kvm + * and misc regs in gem5. The actual mapping is only created the + * first time the method is called and stored in a cache + * (ArmV8KvmCPU::sysRegMap). + * + * @return Vector of kvm<->misc reg mappings. + */ + const std::vector<ArmV8KvmCPU::MiscRegInfo> &getSysRegMap() const; + + /** Mapping between gem5 integer registers and integer registers in kvm */ + static const std::vector<ArmV8KvmCPU::IntRegInfo> intRegMap; + /** Mapping between gem5 misc registers registers and registers in kvm */ + static const std::vector<ArmV8KvmCPU::MiscRegInfo> miscRegMap; + + /** Cached mapping between system registers in kvm and misc regs in gem5 */ + mutable std::vector<ArmV8KvmCPU::MiscRegInfo> sysRegMap; +}; + +#endif // __ARCH_ARM_KVM_ARMV8_CPU_HH__ diff --git a/src/arch/arm/kvm/base_cpu.cc b/src/arch/arm/kvm/base_cpu.cc new file mode 100644 index 000000000..61de16900 --- /dev/null +++ b/src/arch/arm/kvm/base_cpu.cc @@ -0,0 +1,154 @@ +/* + * Copyright (c) 2012, 2015 ARM Limited + * All rights reserved + * + * The license below extends only to copyright in the software and shall + * not be construed as granting a license to any other intellectual + * property including but not limited to intellectual property relating + * to a hardware implementation of the functionality of the software + * licensed hereunder. You may use the software subject to the license + * terms below provided that you ensure that this notice is replicated + * unmodified and in its entirety in all distributions of the software, + * modified or unmodified, in source code or in binary form. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions are + * met: redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer; + * redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution; + * neither the name of the copyright holders nor the names of its + * contributors may be used to endorse or promote products derived from + * this software without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS + * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT + * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR + * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT + * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, + * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT + * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, + * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY + * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT + * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE + * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + * + * Authors: Andreas Sandberg + */ + +#include "arch/arm/kvm/base_cpu.hh" + +#include <linux/kvm.h> + +#include "debug/KvmInt.hh" +#include "params/BaseArmKvmCPU.hh" + + +#define INTERRUPT_ID(type, vcpu, irq) ( \ + ((type) << KVM_ARM_IRQ_TYPE_SHIFT) | \ + ((vcpu) << KVM_ARM_IRQ_VCPU_SHIFT) | \ + ((irq) << KVM_ARM_IRQ_NUM_SHIFT)) + +#define INTERRUPT_VCPU_IRQ(vcpu) \ + INTERRUPT_ID(KVM_ARM_IRQ_TYPE_CPU, vcpu, KVM_ARM_IRQ_CPU_IRQ) + +#define INTERRUPT_VCPU_FIQ(vcpu) \ + INTERRUPT_ID(KVM_ARM_IRQ_TYPE_CPU, vcpu, KVM_ARM_IRQ_CPU_FIQ) + + +BaseArmKvmCPU::BaseArmKvmCPU(BaseArmKvmCPUParams *params) + : BaseKvmCPU(params), + irqAsserted(false), fiqAsserted(false) +{ +} + +BaseArmKvmCPU::~BaseArmKvmCPU() +{ +} + +void +BaseArmKvmCPU::startup() +{ + BaseKvmCPU::startup(); + + /* TODO: This needs to be moved when we start to support VMs with + * multiple threads since kvmArmVCpuInit requires that all CPUs in + * the VM have been created. + */ + struct kvm_vcpu_init target_config; + memset(&target_config, 0, sizeof(target_config)); + + vm.kvmArmPreferredTarget(target_config); + kvmArmVCpuInit(target_config); +} + +Tick +BaseArmKvmCPU::kvmRun(Tick ticks) +{ + bool simFIQ(interrupts->checkRaw(INT_FIQ)); + bool simIRQ(interrupts->checkRaw(INT_IRQ)); + + if (fiqAsserted != simFIQ) { + fiqAsserted = simFIQ; + DPRINTF(KvmInt, "KVM: Update FIQ state: %i\n", simFIQ); + vm.setIRQLine(INTERRUPT_VCPU_FIQ(vcpuID), simFIQ); + } + if (irqAsserted != simIRQ) { + irqAsserted = simIRQ; + DPRINTF(KvmInt, "KVM: Update IRQ state: %i\n", simIRQ); + vm.setIRQLine(INTERRUPT_VCPU_IRQ(vcpuID), simIRQ); + } + + return BaseKvmCPU::kvmRun(ticks); +} + +const BaseArmKvmCPU::RegIndexVector & +BaseArmKvmCPU::getRegList() const +{ + // Do we need to request a list of registers from the kernel? + if (_regIndexList.size() == 0) { + // Start by probing for the size of the list. We do this + // calling the ioctl with a struct size of 0. The kernel will + // return the number of elements required to hold the list. + kvm_reg_list regs_probe; + regs_probe.n = 0; + getRegList(regs_probe); + + // Request the actual register list now that we know how many + // register we need to allocate space for. + std::unique_ptr<struct kvm_reg_list> regs; + const size_t size(sizeof(struct kvm_reg_list) + + regs_probe.n * sizeof(uint64_t)); + regs.reset((struct kvm_reg_list *)operator new(size)); + regs->n = regs_probe.n; + if (!getRegList(*regs)) + panic("Failed to determine register list size.\n"); + + _regIndexList.assign(regs->reg, regs->reg + regs->n); + } + + return _regIndexList; +} + +void +BaseArmKvmCPU::kvmArmVCpuInit(const struct kvm_vcpu_init &init) +{ + if (ioctl(KVM_ARM_VCPU_INIT, (void *)&init) == -1) + panic("KVM: Failed to initialize vCPU\n"); +} + +bool +BaseArmKvmCPU::getRegList(struct kvm_reg_list ®s) const +{ + if (ioctl(KVM_GET_REG_LIST, (void *)®s) == -1) { + if (errno == E2BIG) { + return false; + } else { + panic("KVM: Failed to get vCPU register list (errno: %i)\n", + errno); + } + } else { + return true; + } +} diff --git a/src/arch/arm/kvm/base_cpu.hh b/src/arch/arm/kvm/base_cpu.hh new file mode 100644 index 000000000..736153b78 --- /dev/null +++ b/src/arch/arm/kvm/base_cpu.hh @@ -0,0 +1,111 @@ +/* + * Copyright (c) 2012, 2015 ARM Limited + * All rights reserved + * + * The license below extends only to copyright in the software and shall + * not be construed as granting a license to any other intellectual + * property including but not limited to intellectual property relating + * to a hardware implementation of the functionality of the software + * licensed hereunder. You may use the software subject to the license + * terms below provided that you ensure that this notice is replicated + * unmodified and in its entirety in all distributions of the software, + * modified or unmodified, in source code or in binary form. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions are + * met: redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer; + * redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution; + * neither the name of the copyright holders nor the names of its + * contributors may be used to endorse or promote products derived from + * this software without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS + * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT + * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR + * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT + * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, + * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT + * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, + * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY + * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT + * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE + * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + * + * Authors: Andreas Sandberg + */ + +#ifndef __ARCH_ARM_KVM_BASE_CPU_HH__ +#define __ARCH_ARM_KVM_BASE_CPU_HH__ + +#include <vector> + +#include "cpu/kvm/base.hh" + +struct BaseArmKvmCPUParams; + +class BaseArmKvmCPU : public BaseKvmCPU +{ + public: + BaseArmKvmCPU(BaseArmKvmCPUParams *params); + virtual ~BaseArmKvmCPU(); + + void startup() M5_ATTR_OVERRIDE; + + protected: + Tick kvmRun(Tick ticks) M5_ATTR_OVERRIDE; + + + /** Cached state of the IRQ line */ + bool irqAsserted; + /** Cached state of the FIQ line */ + bool fiqAsserted; + + protected: + typedef std::vector<uint64_t> RegIndexVector; + + /** + * Get a list of registers supported by getOneReg() and setOneReg(). + * + * This method returns a list of all registers supported by + * kvm. The actual list is only requested the first time this + * method is called. Subsequent calls return a cached copy of the + * register list. + * + * @return Vector of register indexes. + */ + const RegIndexVector &getRegList() const; + + /** + * Tell the kernel to initialize this CPU + * + * The kernel needs to know what type of the CPU that we want to + * emulate. The specified CPU type has to be compatible with the + * host CPU. In practice, we usually call + * KvmVM::kvmArmPreferredTarget() to discover the host CPU. + * + * @param target CPU type to emulate + */ + void kvmArmVCpuInit(const struct kvm_vcpu_init &init); + + private: + std::unique_ptr<struct kvm_reg_list> tryGetRegList(uint64_t nelem) const; + + /** + * Get a list of registers supported by getOneReg() and setOneReg(). + * + * @return False if the number of elements allocated in the list + * is too small to hold the complete register list (the required + * size is written to regs.n in this case). True on success. + */ + bool getRegList(struct kvm_reg_list ®s) const; + + /** + * Cached copy of the list of registers supported by KVM + */ + mutable RegIndexVector _regIndexList; +}; + +#endif // __ARCH_ARM_KVM_BASE_CPU_HH__ |