diff options
Diffstat (limited to 'src/cpu/kvm')
| -rw-r--r-- | src/cpu/kvm/ArmKvmCPU.py | 43 | ||||
| -rw-r--r-- | src/cpu/kvm/SConscript | 4 | ||||
| -rw-r--r-- | src/cpu/kvm/arm_cpu.cc | 705 | ||||
| -rw-r--r-- | src/cpu/kvm/arm_cpu.hh | 161 |
4 files changed, 913 insertions, 0 deletions
diff --git a/src/cpu/kvm/ArmKvmCPU.py b/src/cpu/kvm/ArmKvmCPU.py new file mode 100644 index 000000000..2bdc05820 --- /dev/null +++ b/src/cpu/kvm/ArmKvmCPU.py @@ -0,0 +1,43 @@ +# Copyright (c) 2012 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 ArmKvmCPU(BaseKvmCPU): + type = 'ArmKvmCPU' + cxx_header = "cpu/kvm/arm_cpu.hh" diff --git a/src/cpu/kvm/SConscript b/src/cpu/kvm/SConscript index a567720fa..56cc660cb 100644 --- a/src/cpu/kvm/SConscript +++ b/src/cpu/kvm/SConscript @@ -48,6 +48,10 @@ if env['USE_KVM']: Source('perfevent.cc') Source('timer.cc') + if env['TARGET_ISA'] == 'arm': + SimObject('ArmKvmCPU.py') + Source('arm_cpu.cc') + DebugFlag('Kvm', 'Basic KVM Functionality') DebugFlag('KvmContext', 'KVM/gem5 context synchronization') DebugFlag('KvmIO', 'KVM MMIO diagnostics') diff --git a/src/cpu/kvm/arm_cpu.cc b/src/cpu/kvm/arm_cpu.cc new file mode 100644 index 000000000..92851520f --- /dev/null +++ b/src/cpu/kvm/arm_cpu.cc @@ -0,0 +1,705 @@ +/* + * Copyright (c) 2012 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 <linux/kvm.h> + +#include <algorithm> +#include <cerrno> +#include <memory> + +#include "arch/registers.hh" +#include "cpu/kvm/arm_cpu.hh" +#include "cpu/kvm/base.hh" +#include "debug/Kvm.hh" +#include "debug/KvmContext.hh" +#include "debug/KvmInt.hh" + +using namespace ArmISA; + +#define EXTRACT_FIELD(val, mask, shift) \ + (((val) & (mask)) >> (shift)) + +#define REG_IS_ARM(id) \ + (((id) & KVM_REG_ARCH_MASK) == KVM_REG_ARM) + +#define REG_IS_32BIT(id) \ + (((id) & KVM_REG_SIZE_MASK) == KVM_REG_SIZE_U32) + +#define REG_IS_64BIT(id) \ + (((id) & KVM_REG_SIZE_MASK) == KVM_REG_SIZE_U64) + +#define REG_IS_CP(id, cp) \ + (((id) & KVM_REG_ARM_COPROC_MASK) == (cp)) + +#define REG_IS_CORE(id) REG_IS_CP((id), KVM_REG_ARM_CORE) + +#define REG_IS_VFP(id) REG_IS_CP((id), KVM_REG_ARM_VFP) +#define REG_VFP_REG(id) ((id) & KVM_REG_ARM_VFP_MASK) +// HACK: These aren't really defined in any of the headers, so we'll +// assume some reasonable values for now. +#define REG_IS_VFP_REG(id) (REG_VFP_REG(id) < 0x100) +#define REG_IS_VFP_CTRL(id) (REG_VFP_REG(id) >= 0x100) + +#define REG_IS_DEMUX(id) REG_IS_CP((id), KVM_REG_ARM_DEMUX) + + +// There is no constant in the kernel headers defining the mask to use +// to get the core register index. We'll just do what they do +// internally. +#define REG_CORE_IDX(id) \ + (~(KVM_REG_ARCH_MASK | KVM_REG_SIZE_MASK | KVM_REG_ARM_CORE)) + +#define REG_CP(id) \ + EXTRACT_FIELD(id, KVM_REG_ARM_COPROC_MASK, KVM_REG_ARM_COPROC_SHIFT) + +#define REG_CRN(id) \ + EXTRACT_FIELD(id, KVM_REG_ARM_32_CRN_MASK, KVM_REG_ARM_32_CRN_SHIFT) + +#define REG_OPC1(id) \ + EXTRACT_FIELD(id, KVM_REG_ARM_OPC1_MASK, KVM_REG_ARM_OPC1_SHIFT) + +#define REG_CRM(id) \ + EXTRACT_FIELD(id, KVM_REG_ARM_CRM_MASK, KVM_REG_ARM_CRM_SHIFT) + +#define REG_OPC2(id) \ + EXTRACT_FIELD(id, KVM_REG_ARM_32_OPC2_MASK, KVM_REG_ARM_32_OPC2_SHIFT) + +#define REG_CP32(cpnum, crn, opc1, crm, opc2) ( \ + (KVM_REG_ARM | KVM_REG_SIZE_U32) | \ + ((cpnum) << KVM_REG_ARM_COPROC_SHIFT) | \ + ((crn) << KVM_REG_ARM_32_CRN_SHIFT) | \ + ((opc1) << KVM_REG_ARM_OPC1_SHIFT) | \ + ((crm) << KVM_REG_ARM_CRM_SHIFT) | \ + ((opc2) << KVM_REG_ARM_32_OPC2_SHIFT)) + +#define REG_CP64(cpnum, opc1, crm) ( \ + (KVM_REG_ARM | KVM_REG_SIZE_U64) | \ + ((cpnum) << KVM_REG_ARM_COPROC_SHIFT) | \ + ((opc1) << KVM_REG_ARM_OPC1_SHIFT) | \ + ((crm) << KVM_REG_ARM_CRM_SHIFT)) + +#define REG_CORE32(kname) ( \ + (KVM_REG_ARM | KVM_REG_SIZE_U32) | \ + (KVM_REG_ARM_CORE) | \ + (KVM_REG_ARM_CORE_REG(kname))) + +#define REG_VFP32(regno) ( \ + (KVM_REG_ARM | KVM_REG_SIZE_U32) | \ + KVM_REG_ARM_VFP | (regno)) + +#define REG_VFP64(regno) ( \ + (KVM_REG_ARM | KVM_REG_SIZE_U64) | \ + KVM_REG_ARM_VFP | (regno)) + +#define REG_DEMUX32(dmxid, val) ( \ + (KVM_REG_ARM | KVM_REG_SIZE_U32) | \ + (dmxid) | (val)) + +// Some of the co-processor registers are invariants and must have the +// same value on both the host and the guest. We need to keep a list +// of these to prevent gem5 from fiddling with them on the guest. +static uint64_t invariant_reg_vector[] = { + REG_CP32(15, 0, 0, 0, 0), // MIDR + REG_CP32(15, 0, 0, 0, 1), // CTR + REG_CP32(15, 0, 0, 0, 2), // TCMTR + REG_CP32(15, 0, 0, 0, 3), // TLBTR + REG_CP32(15, 0, 0, 0, 6), // REVIDR + + REG_CP32(15, 0, 0, 1, 0), // ID_PFR0 + REG_CP32(15, 0, 0, 1, 1), // ID_PFR1 + REG_CP32(15, 0, 0, 1, 2), // ID_DFR0 + REG_CP32(15, 0, 0, 1, 3), // ID_AFR0 + REG_CP32(15, 0, 0, 1, 4), // ID_MMFR0 + REG_CP32(15, 0, 0, 1, 5), // ID_MMFR1 + REG_CP32(15, 0, 0, 1, 6), // ID_MMFR2 + REG_CP32(15, 0, 0, 1, 7), // ID_MMFR3 + + REG_CP32(15, 0, 0, 2, 0), // ID_ISAR0 + REG_CP32(15, 0, 0, 2, 1), // ID_ISAR1 + REG_CP32(15, 0, 0, 2, 2), // ID_ISAR2 + REG_CP32(15, 0, 0, 2, 3), // ID_ISAR3 + REG_CP32(15, 0, 0, 2, 4), // ID_ISAR4 + REG_CP32(15, 0, 0, 2, 5), // ID_ISAR5 + + REG_CP32(15, 0, 1, 0, 0), // CSSIDR + REG_CP32(15, 0, 1, 0, 1), // CLIDR + REG_CP32(15, 0, 1, 0, 7), // AIDR + + REG_VFP32(KVM_REG_ARM_VFP_MVFR0), + REG_VFP32(KVM_REG_ARM_VFP_MVFR1), + REG_VFP32(KVM_REG_ARM_VFP_FPSID), + + REG_DEMUX32(KVM_REG_ARM_DEMUX_ID_CCSIDR, 0), +}; + +const static uint64_t KVM_REG64_TTBR0(REG_CP64(15, 0, 2)); +const static uint64_t KVM_REG64_TTBR1(REG_CP64(15, 1, 2)); + +#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) + + +#define COUNT_OF(l) (sizeof(l) / sizeof(*l)) + +const std::set<uint64_t> ArmKvmCPU::invariant_regs( + invariant_reg_vector, + invariant_reg_vector + COUNT_OF(invariant_reg_vector)); + + +ArmKvmCPU::KvmIntRegInfo ArmKvmCPU::kvmIntRegs[] = { + { REG_CORE32(usr_regs.ARM_r0), INTREG_R0, "R0" }, + { REG_CORE32(usr_regs.ARM_r1), INTREG_R1, "R1" }, + { REG_CORE32(usr_regs.ARM_r2), INTREG_R2, "R2" }, + { REG_CORE32(usr_regs.ARM_r3), INTREG_R3, "R3" }, + { REG_CORE32(usr_regs.ARM_r4), INTREG_R4, "R4" }, + { REG_CORE32(usr_regs.ARM_r5), INTREG_R5, "R5" }, + { REG_CORE32(usr_regs.ARM_r6), INTREG_R6, "R6" }, + { REG_CORE32(usr_regs.ARM_r7), INTREG_R7, "R7" }, + { REG_CORE32(usr_regs.ARM_r8), INTREG_R8, "R8" }, + { REG_CORE32(usr_regs.ARM_r9), INTREG_R9, "R9" }, + { REG_CORE32(usr_regs.ARM_r10), INTREG_R10, "R10" }, + { REG_CORE32(usr_regs.ARM_fp), INTREG_R11, "R11" }, + { REG_CORE32(usr_regs.ARM_ip), INTREG_R12, "R12" }, + { REG_CORE32(usr_regs.ARM_sp), INTREG_R13, "R13(USR)" }, + { REG_CORE32(usr_regs.ARM_lr), INTREG_R14, "R14(USR)" }, + + { REG_CORE32(svc_regs[0]), INTREG_SP_SVC, "R13(SVC)" }, + { REG_CORE32(svc_regs[1]), INTREG_LR_SVC, "R14(SVC)" }, + + { REG_CORE32(abt_regs[0]), INTREG_SP_ABT, "R13(ABT)" }, + { REG_CORE32(abt_regs[1]), INTREG_LR_ABT, "R14(ABT)" }, + + { REG_CORE32(und_regs[0]), INTREG_SP_UND, "R13(UND)" }, + { REG_CORE32(und_regs[1]), INTREG_LR_UND, "R14(UND)" }, + + { REG_CORE32(irq_regs[0]), INTREG_SP_IRQ, "R13(IRQ)" }, + { REG_CORE32(irq_regs[1]), INTREG_LR_IRQ, "R14(IRQ)" }, + + + { REG_CORE32(fiq_regs[0]), INTREG_R8_FIQ, "R8(FIQ)" }, + { REG_CORE32(fiq_regs[1]), INTREG_R9_FIQ, "R9(FIQ)" }, + { REG_CORE32(fiq_regs[2]), INTREG_R10_FIQ, "R10(FIQ)" }, + { REG_CORE32(fiq_regs[3]), INTREG_R11_FIQ, "R11(FIQ)" }, + { REG_CORE32(fiq_regs[4]), INTREG_R12_FIQ, "R12(FIQ)" }, + { REG_CORE32(fiq_regs[5]), INTREG_R13_FIQ, "R13(FIQ)" }, + { REG_CORE32(fiq_regs[6]), INTREG_R14_FIQ, "R14(FIQ)" }, + { 0, NUM_INTREGS, NULL } +}; + +ArmKvmCPU::KvmCoreMiscRegInfo ArmKvmCPU::kvmCoreMiscRegs[] = { + { REG_CORE32(usr_regs.ARM_cpsr), MISCREG_CPSR, "CPSR" }, + { REG_CORE32(svc_regs[2]), MISCREG_SPSR_SVC, "SPSR(SVC)" }, + { REG_CORE32(abt_regs[2]), MISCREG_SPSR_ABT, "SPSR(ABT)" }, + { REG_CORE32(und_regs[2]), MISCREG_SPSR_UND, "SPSR(UND)" }, + { REG_CORE32(irq_regs[2]), MISCREG_SPSR_IRQ, "SPSR(IRQ)" }, + { REG_CORE32(fiq_regs[2]), MISCREG_SPSR_FIQ, "SPSR(FIQ)" }, + { 0, NUM_MISCREGS } +}; + +ArmKvmCPU::ArmKvmCPU(ArmKvmCPUParams *params) + : BaseKvmCPU(params), + irqAsserted(false), fiqAsserted(false) +{ +} + +ArmKvmCPU::~ArmKvmCPU() +{ +} + +void +ArmKvmCPU::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. + */ + /* TODO: The CPU type needs to be configurable once KVM on ARM + * starts to support more CPUs. + */ + kvmArmVCpuInit(KVM_ARM_TARGET_CORTEX_A15); +} + +void +ArmKvmCPU::tick() +{ + 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); + } + + BaseKvmCPU::tick(); +} + +void +ArmKvmCPU::updateKvmState() +{ + DPRINTF(KvmContext, "Updating KVM state...\n"); + + updateKvmStateCore(); + updateKvmStateMisc(); +} + +void +ArmKvmCPU::updateThreadContext() +{ + DPRINTF(KvmContext, "Updating gem5 state...\n"); + + updateTCStateCore(); + updateTCStateMisc(); +} + +const ArmKvmCPU::RegIndexVector & +ArmKvmCPU::getRegList() const +{ + if (_regIndexList.size() == 0) { + std::unique_ptr<struct kvm_reg_list> regs; + uint64_t i(1); + + do { + i <<= 1; + regs.reset((struct kvm_reg_list *) + operator new(sizeof(struct kvm_reg_list) + + i * sizeof(uint64_t))); + regs->n = i; + } while (!getRegList(*regs)); + _regIndexList.assign(regs->reg, + regs->reg + regs->n); + } + + return _regIndexList; +} + +void +ArmKvmCPU::kvmArmVCpuInit(uint32_t target) +{ + struct kvm_vcpu_init init; + + memset(&init, 0, sizeof(init)); + + init.target = target; + + kvmArmVCpuInit(init); +} + +void +ArmKvmCPU::kvmArmVCpuInit(const struct kvm_vcpu_init &init) +{ + if (ioctl(KVM_ARM_VCPU_INIT, (void *)&init) == -1) + panic("KVM: Failed to initialize vCPU\n"); +} + +MiscRegIndex +ArmKvmCPU::decodeCoProcReg(uint64_t id) const +{ + const unsigned cp(REG_CP(id)); + const bool is_reg32(REG_IS_32BIT(id)); + const bool is_reg64(REG_IS_64BIT(id)); + + // CP numbers larger than 15 are reserved for KVM extensions + if (cp > 15) + return NUM_MISCREGS; + + const unsigned crm(REG_CRM(id)); + const unsigned crn(REG_CRN(id)); + const unsigned opc1(REG_OPC1(id)); + const unsigned opc2(REG_OPC2(id)); + + if (is_reg32) { + switch (cp) { + case 14: + return decodeCP14Reg(crn, opc1, crm, opc2); + + case 15: + return decodeCP15Reg(crn, opc1, crm, opc2); + + default: + return NUM_MISCREGS; + } + } else if(is_reg64) { + return NUM_MISCREGS; + } else { + warn("Unhandled register length, register (0x%x) ignored.\n"); + return NUM_MISCREGS; + } +} + +ArmISA::MiscRegIndex +ArmKvmCPU::decodeVFPCtrlReg(uint64_t id) const +{ + if (!REG_IS_ARM(id) || !REG_IS_VFP(id) || !REG_IS_VFP_CTRL(id)) + return NUM_MISCREGS; + + const unsigned vfp_reg(REG_VFP_REG(id)); + switch (vfp_reg) { + case KVM_REG_ARM_VFP_FPSID: return MISCREG_FPSID; + case KVM_REG_ARM_VFP_FPSCR: return MISCREG_FPSCR; + case KVM_REG_ARM_VFP_MVFR0: return MISCREG_MVFR0; + case KVM_REG_ARM_VFP_MVFR1: return MISCREG_MVFR1; + case KVM_REG_ARM_VFP_FPEXC: return MISCREG_FPEXC; + + case KVM_REG_ARM_VFP_FPINST: + case KVM_REG_ARM_VFP_FPINST2: + warn_once("KVM: FPINST not implemented.\n"); + return NUM_MISCREGS; + + default: + return NUM_MISCREGS; + } +} + +bool +ArmKvmCPU::isInvariantReg(uint64_t id) +{ + /* Mask away the value field from multiplexed registers, we assume + * that entire groups of multiplexed registers can be treated as + * invariant. */ + if (REG_IS_ARM(id) && REG_IS_DEMUX(id)) + id &= ~KVM_REG_ARM_DEMUX_VAL_MASK; + + return invariant_regs.find(id) != invariant_regs.end(); +} + +bool +ArmKvmCPU::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; + } +} + +void +ArmKvmCPU::updateKvmStateCore() +{ + for (const KvmIntRegInfo *ri(kvmIntRegs); + ri->idx != NUM_INTREGS; ++ri) { + + uint64_t value(tc->readIntRegFlat(ri->idx)); + DPRINTF(KvmContext, "kvm(%s) := 0x%x\n", ri->name, value); + setOneReg(ri->id, value); + } + + DPRINTF(KvmContext, "kvm(PC) := 0x%x\n", tc->instAddr()); + setOneReg(REG_CORE32(usr_regs.ARM_pc), tc->instAddr()); + + for (const KvmCoreMiscRegInfo *ri(kvmCoreMiscRegs); + ri->idx != NUM_MISCREGS; ++ri) { + + uint64_t value(tc->readMiscReg(ri->idx)); + DPRINTF(KvmContext, "kvm(%s) := 0x%x\n", ri->name, value); + setOneReg(ri->id, value); + } +} + +void +ArmKvmCPU::updateKvmStateMisc() +{ + static bool warned(false); // We can't use warn_once since we want + // to show /all/ registers + + const RegIndexVector ®s(getRegList()); + + for (RegIndexVector::const_iterator it(regs.begin()); + it != regs.end(); + ++it) { + + if (!REG_IS_ARM(*it)) { + if (!warned) + warn("Skipping non-ARM register: 0x%x\n", *it); + } else if (isInvariantReg(*it)) { + DPRINTF(Kvm, "Skipping invariant register: 0x%x\n", *it); + } else if (REG_IS_CORE(*it)) { + // Core registers are handled in updateKvmStateCore + continue; + } else if (REG_CP(*it) <= 15) { + updateKvmStateCoProc(*it, !warned); + } else if (REG_IS_VFP(*it)) { + updateKvmStateVFP(*it, !warned); + } else { + if (!warned) { + warn("Skipping register with unknown CP (%i) id: 0x%x\n", + REG_CP(*it), *it); + } + } + + } + + warned = true; +} + +void +ArmKvmCPU::updateKvmStateCoProc(uint64_t id, bool show_warnings) +{ + MiscRegIndex reg(decodeCoProcReg(id)); + + assert(REG_IS_ARM(id)); + assert(REG_CP(id) <= 15); + + if (id == KVM_REG64_TTBR0 || id == KVM_REG64_TTBR1) { + // HACK HACK HACK: Workaround for 64-bit TTBRx + reg = (id == KVM_REG64_TTBR0 ? MISCREG_TTBR0 : MISCREG_TTBR1); + if (show_warnings) + hack("KVM: 64-bit TTBBRx workaround\n"); + } + + if (reg == NUM_MISCREGS) { + if (show_warnings) { + warn("KVM: Ignoring unknown KVM co-processor register (0x%.8x):\n", + id); + warn("\t0x%x: [CP: %i 64: %i CRn: c%i opc1: %.2i CRm: c%i" + " opc2: %i]\n", + id, REG_CP(id), REG_IS_64BIT(id), REG_CRN(id), + REG_OPC1(id), REG_CRM(id), REG_OPC2(id)); + } + } else if (reg >= MISCREG_CP15_UNIMP_START && reg < MISCREG_CP15_END) { + if (show_warnings) + warn("KVM: Co-processor reg. %s not implemented by gem5.\n", + miscRegName[reg]); + } else { + setOneReg(id, tc->readMiscRegNoEffect(reg)); + } +} + + +void +ArmKvmCPU::updateKvmStateVFP(uint64_t id, bool show_warnings) +{ + assert(REG_IS_ARM(id)); + assert(REG_IS_VFP(id)); + + if (REG_IS_VFP_REG(id)) { + if (!REG_IS_64BIT(id)) { + if (show_warnings) + warn("Unexpected VFP register length (reg: 0x%x).\n", id); + return; + } + const unsigned idx(id & KVM_REG_ARM_VFP_MASK); + const unsigned idx_base(idx << 1); + const unsigned idx_hi(idx_base + 1); + const unsigned idx_lo(idx_base + 0); + uint64_t value( + ((uint64_t)tc->readFloatRegBitsFlat(idx_hi) << 32) | + tc->readFloatRegBitsFlat(idx_lo)); + + setOneReg(id, value); + } else if (REG_IS_VFP_CTRL(id)) { + MiscRegIndex idx(decodeVFPCtrlReg(id)); + if (idx == NUM_MISCREGS) { + if (show_warnings) + warn("Unhandled VFP control register: 0x%x\n", id); + return; + } + if (!REG_IS_32BIT(id)) { + if (show_warnings) + warn("Ignoring VFP control register (%s) with " + "unexpected size.\n", + miscRegName[idx]); + return; + } + setOneReg(id, (uint32_t)tc->readMiscReg(idx)); + } else { + if (show_warnings) + warn("Unhandled VFP register: 0x%x\n", id); + } +} + +void +ArmKvmCPU::updateTCStateCore() +{ + for (const KvmIntRegInfo *ri(kvmIntRegs); + ri->idx != NUM_INTREGS; ++ri) { + + tc->setIntRegFlat(ri->idx, getOneRegU32(ri->id)); + } + + for (const KvmCoreMiscRegInfo *ri(kvmCoreMiscRegs); + ri->idx != NUM_MISCREGS; ++ri) { + + tc->setMiscRegNoEffect(ri->idx, getOneRegU32(ri->id)); + } + + /* We want the simulator to execute all side-effects of the CPSR + * update since this updates PC state and register maps. + */ + tc->setMiscReg(MISCREG_CPSR, tc->readMiscRegNoEffect(MISCREG_CPSR)); + + // We update the PC state after we have updated the CPSR the + // contents of the CPSR affects how the npc is updated. + PCState pc(tc->pcState()); + pc.set(getOneRegU32(REG_CORE32(usr_regs.ARM_pc))); + tc->pcState(pc); +} + +void +ArmKvmCPU::updateTCStateMisc() +{ + static bool warned(false); // We can't use warn_once since we want + // to show /all/ registers + + const RegIndexVector ®_ids(getRegList());; + for (RegIndexVector::const_iterator it(reg_ids.begin()); + it != reg_ids.end(); ++it) { + + if (!REG_IS_ARM(*it)) { + if (!warned) + warn("Skipping non-ARM register: 0x%x\n", *it); + } else if (REG_IS_CORE(*it)) { + // Core registers are handled in updateKvmStateCore + } else if (REG_CP(*it) <= 15) { + updateTCStateCoProc(*it, !warned); + } else if (REG_IS_VFP(*it)) { + updateTCStateVFP(*it, !warned); + } else { + if (!warned) { + warn("Skipping register with unknown CP (%i) id: 0x%x\n", + REG_CP(*it), *it); + } + } + } + + warned = true; +} + +void +ArmKvmCPU::updateTCStateCoProc(uint64_t id, bool show_warnings) +{ + MiscRegIndex reg(decodeCoProcReg(id)); + + assert(REG_IS_ARM(id)); + assert(REG_CP(id) <= 15); + + if (id == KVM_REG64_TTBR0 || id == KVM_REG64_TTBR1) { + // HACK HACK HACK: We don't currently support 64-bit TTBR0/TTBR1 + hack_once("KVM: 64-bit TTBRx workaround\n"); + tc->setMiscRegNoEffect( + id == KVM_REG64_TTBR0 ? MISCREG_TTBR0 : MISCREG_TTBR1, + (uint32_t)(getOneRegU64(id) & 0xFFFFFFFF)); + } else if (reg == MISCREG_TTBCR) { + uint32_t value(getOneRegU64(id)); + if (value & 0x80000000) + panic("KVM: Guest tried to enable LPAE.\n"); + tc->setMiscRegNoEffect(reg, value); + } else if (reg == NUM_MISCREGS) { + if (show_warnings) { + warn("KVM: Ignoring unknown KVM co-processor register:\n", id); + warn("\t0x%x: [CP: %i 64: %i CRn: c%i opc1: %.2i CRm: c%i" + " opc2: %i]\n", + id, REG_CP(id), REG_IS_64BIT(id), REG_CRN(id), + REG_OPC1(id), REG_CRM(id), REG_OPC2(id)); + } + } else if (reg >= MISCREG_CP15_UNIMP_START && reg < MISCREG_CP15_END) { + if (show_warnings) + warn_once("KVM: Co-processor reg. %s not implemented by gem5.\n", + miscRegName[reg]); + } else { + tc->setMiscRegNoEffect(reg, getOneRegU32(id)); + } +} + +void +ArmKvmCPU::updateTCStateVFP(uint64_t id, bool show_warnings) +{ + assert(REG_IS_ARM(id)); + assert(REG_IS_VFP(id)); + + if (REG_IS_VFP_REG(id)) { + if (!REG_IS_64BIT(id)) { + if (show_warnings) + warn("Unexpected VFP register length (reg: 0x%x).\n", id); + return; + } + const unsigned idx(id & KVM_REG_ARM_VFP_MASK); + const unsigned idx_base(idx << 1); + const unsigned idx_hi(idx_base + 1); + const unsigned idx_lo(idx_base + 0); + uint64_t value(getOneRegU64(id)); + + tc->setFloatRegBitsFlat(idx_hi, (value >> 32) & 0xFFFFFFFF); + tc->setFloatRegBitsFlat(idx_lo, value & 0xFFFFFFFF); + } else if (REG_IS_VFP_CTRL(id)) { + MiscRegIndex idx(decodeVFPCtrlReg(id)); + if (idx == NUM_MISCREGS) { + if (show_warnings) + warn("Unhandled VFP control register: 0x%x\n", id); + return; + } + if (!REG_IS_32BIT(id)) { + if (show_warnings) + warn("Ignoring VFP control register (%s) with " + "unexpected size.\n", + miscRegName[idx]); + return; + } + tc->setMiscReg(idx, getOneRegU64(id)); + } else { + if (show_warnings) + warn("Unhandled VFP register: 0x%x\n", id); + } +} + +ArmKvmCPU * +ArmKvmCPUParams::create() +{ + return new ArmKvmCPU(this); +} diff --git a/src/cpu/kvm/arm_cpu.hh b/src/cpu/kvm/arm_cpu.hh new file mode 100644 index 000000000..b9d18b7f1 --- /dev/null +++ b/src/cpu/kvm/arm_cpu.hh @@ -0,0 +1,161 @@ +/* + * Copyright (c) 2012 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 __CPU_KVM_ARM_CPU_HH__ +#define __CPU_KVM_ARM_CPU_HH__ + +#include <set> +#include <vector> + +#include "cpu/kvm/base.hh" +#include "params/ArmKvmCPU.hh" + +/** + * ARM implementation of a KVM-based hardware virtualized CPU. + * Architecture specific limitations: + * * LPAE is currently not supported by gem5. We therefore panic if LPAE + * is enabled when returning to gem5. + * * The co-processor based interface to the architected timer is + * unsupported. We can't support this due to limitations in the KVM + * API on ARM. + * * M5 ops are currently not supported. This requires either a kernel + * hack or a memory mapped device that handles the guest<->m5 + * interface. + */ +class ArmKvmCPU : public BaseKvmCPU +{ + public: + ArmKvmCPU(ArmKvmCPUParams *params); + virtual ~ArmKvmCPU(); + + void startup(); + + protected: + struct KvmIntRegInfo { + /** KVM ID */ + const uint64_t id; + /** gem5 index */ + const IntRegIndex idx; + /** Name in debug output */ + const char *name; + }; + + struct KvmCoreMiscRegInfo { + /** KVM ID */ + const uint64_t id; + /** gem5 index */ + const MiscRegIndex idx; + /** Name in debug output */ + const char *name; + }; + + typedef std::vector<uint64_t> RegIndexVector; + + void tick(); + + void updateKvmState(); + void updateThreadContext(); + + /** + * Get a list of registers supported by getOneReg() and setOneReg(). + */ + const RegIndexVector &getRegList() const; + + void kvmArmVCpuInit(uint32_t target); + void kvmArmVCpuInit(const struct kvm_vcpu_init &init); + + ArmISA::MiscRegIndex decodeCoProcReg(uint64_t id) const; + + ArmISA::MiscRegIndex decodeVFPCtrlReg(uint64_t id) const; + + /** + * Determine if a register is invariant. + * + * Some registers must have the same value in both the host and + * the guest. Such registers are referred to as "invariant" + * registers in KVM. This is a restriction imposed by KVM as + * having different values in ID registers (e.g., the cache + * identification registers) would confuse the guest kernel. + */ + bool isInvariantReg(uint64_t id); + + static KvmIntRegInfo kvmIntRegs[]; + static KvmCoreMiscRegInfo kvmCoreMiscRegs[]; + + private: + /** + * 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 + * value is written into n in this case). True on success. + */ + bool getRegList(struct kvm_reg_list ®s) const; + + void updateKvmStateCore(); + void updateKvmStateMisc(); + void updateKvmStateCoProc(uint64_t id, bool show_warnings); + void updateKvmStateVFP(uint64_t id, bool show_warnings); + + void updateTCStateCore(); + void updateTCStateMisc(); + void updateTCStateCoProc(uint64_t id, bool show_warnings); + void updateTCStateVFP(uint64_t id, bool show_warnings); + + + /** Cached state of the IRQ line */ + bool irqAsserted; + /** Cached state of the FIQ line */ + bool fiqAsserted; + + /** + * Cached copy of the list of co-processor registers supported by + * KVM + */ + mutable RegIndexVector _regIndexList; + + /** + * List of co-processor registers that KVM requires to be + * identical on both the host and the guest. KVM does not allow + * writes to these registers. + */ + static const std::set<uint64_t> invariant_regs; +}; + +#endif |