diff options
Diffstat (limited to 'src/arch/arm/kvm')
| -rw-r--r-- | src/arch/arm/kvm/KvmGic.py | 54 | ||||
| -rw-r--r-- | src/arch/arm/kvm/SConscript | 3 | ||||
| -rw-r--r-- | src/arch/arm/kvm/gic.cc | 148 | ||||
| -rw-r--r-- | src/arch/arm/kvm/gic.hh | 133 |
4 files changed, 338 insertions, 0 deletions
diff --git a/src/arch/arm/kvm/KvmGic.py b/src/arch/arm/kvm/KvmGic.py new file mode 100644 index 000000000..53814698e --- /dev/null +++ b/src/arch/arm/kvm/KvmGic.py @@ -0,0 +1,54 @@ +# 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 m5.proxy import * + +from Gic import BaseGic +from KvmVM import KvmVM +from System import System + +class KvmGic(BaseGic): + type = 'KvmGic' + cxx_header = "arch/arm/kvm/gic.hh" + + dist_addr = Param.Addr(0x1f001000, "Address for distributor") + cpu_addr = Param.Addr(0x1f000100, "Address for cpu") + + system = Param.System(Parent.any, + 'System this interrupt controller belongs to') + kvmVM = Param.KvmVM(Parent.any, 'KVM VM (i.e., shared memory domain)') diff --git a/src/arch/arm/kvm/SConscript b/src/arch/arm/kvm/SConscript index 50589659c..185aac7b6 100644 --- a/src/arch/arm/kvm/SConscript +++ b/src/arch/arm/kvm/SConscript @@ -45,6 +45,9 @@ if not (env['USE_KVM'] and env['TARGET_ISA'] == 'arm'): import platform host_isa = platform.machine() +SimObject('KvmGic.py') +Source('gic.cc') + if host_isa == "armv7l": SimObject('ArmKvmCPU.py') Source('arm_cpu.cc') diff --git a/src/arch/arm/kvm/gic.cc b/src/arch/arm/kvm/gic.cc new file mode 100644 index 000000000..9010d8df8 --- /dev/null +++ b/src/arch/arm/kvm/gic.cc @@ -0,0 +1,148 @@ +/* + * 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/gic.hh" + +#include <linux/kvm.h> + +#include "debug/Interrupt.hh" +#include "params/KvmGic.hh" + +KvmGic::KvmGic(const KvmGicParams *p) + : BaseGic(p), + system(*p->system), + vm(*p->kvmVM), + kdev(vm.createDevice(KVM_DEV_TYPE_ARM_VGIC_V2)), + distRange(RangeSize(p->dist_addr, KVM_VGIC_V2_DIST_SIZE)), + cpuRange(RangeSize(p->cpu_addr, KVM_VGIC_V2_CPU_SIZE)), + addrRanges{distRange, cpuRange} +{ + kdev.setAttr<uint64_t>( + KVM_DEV_ARM_VGIC_GRP_ADDR, KVM_VGIC_V2_ADDR_TYPE_DIST, + p->dist_addr); + kdev.setAttr<uint64_t>( + KVM_DEV_ARM_VGIC_GRP_ADDR, KVM_VGIC_V2_ADDR_TYPE_CPU, + p->cpu_addr); +} + +KvmGic::~KvmGic() +{ +} + +void +KvmGic::serialize(std::ostream &os) +{ + panic("Checkpointing unsupported\n"); +} + +void +KvmGic::unserialize(Checkpoint *cp, const std::string &sec) +{ + panic("Checkpointing unsupported\n"); +} + +Tick +KvmGic::read(PacketPtr pkt) +{ + panic("KvmGic: PIO from gem5 is currently unsupported\n"); +} + +Tick +KvmGic::write(PacketPtr pkt) +{ + panic("KvmGic: PIO from gem5 is currently unsupported\n"); +} + +void +KvmGic::sendInt(uint32_t num) +{ + DPRINTF(Interrupt, "Set SPI %d\n", num); + setIntState(KVM_ARM_IRQ_TYPE_SPI, 0, num, true); +} + +void +KvmGic::clearInt(uint32_t num) +{ + DPRINTF(Interrupt, "Clear SPI %d\n", num); + setIntState(KVM_ARM_IRQ_TYPE_SPI, 0, num, false); +} + +void +KvmGic::sendPPInt(uint32_t num, uint32_t cpu) +{ + DPRINTF(Interrupt, "Set PPI %d:%d\n", cpu, num); + setIntState(KVM_ARM_IRQ_TYPE_PPI, cpu, num, true); +} + +void +KvmGic::clearPPInt(uint32_t num, uint32_t cpu) +{ + DPRINTF(Interrupt, "Clear PPI %d:%d\n", cpu, num); + setIntState(KVM_ARM_IRQ_TYPE_PPI, cpu, num, false); +} + +void +KvmGic::verifyMemoryMode() const +{ + if (!(system.isAtomicMode() && system.bypassCaches())) { + fatal("The in-kernel KVM GIC can only be used with KVM CPUs, but the " + "current memory mode does not support KVM.\n"); + } +} + +void +KvmGic::setIntState(uint8_t type, uint8_t vcpu, uint16_t irq, bool high) +{ + assert(type < KVM_ARM_IRQ_TYPE_MASK); + assert(vcpu < KVM_ARM_IRQ_VCPU_MASK); + assert(irq < KVM_ARM_IRQ_NUM_MASK); + const uint32_t line( + (type << KVM_ARM_IRQ_TYPE_SHIFT) | + (vcpu << KVM_ARM_IRQ_VCPU_SHIFT) | + (irq << KVM_ARM_IRQ_NUM_SHIFT)); + + vm.setIRQLine(line, high); +} + + +KvmGic * +KvmGicParams::create() +{ + return new KvmGic(this); +} diff --git a/src/arch/arm/kvm/gic.hh b/src/arch/arm/kvm/gic.hh new file mode 100644 index 000000000..3b196d108 --- /dev/null +++ b/src/arch/arm/kvm/gic.hh @@ -0,0 +1,133 @@ +/* + * 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_GIC_HH__ +#define __ARCH_ARM_KVM_GIC_HH__ + +#include "arch/arm/system.hh" +#include "cpu/kvm/device.hh" +#include "cpu/kvm/vm.hh" +#include "dev/arm/base_gic.hh" +#include "dev/platform.hh" + +class KvmGicParams; + +/** + * In-kernel GIC model. + * + * When using a KVM-based CPU model, it is possible to offload GIC + * emulation to the kernel. This reduces some overheads when the guest + * accesses the GIC and makes it possible to use in-kernel + * architected/generic timer emulation. + * + * This device uses interfaces with the kernel GicV2 model that is + * documented in Documentation/virtual/kvm/devices/arm-vgic.txt in the + * Linux kernel sources. + * + * This GIC model has the following known limitations: + * <ul> + * <li>Checkpointing is not supported. + * <li>This model only works with kvm. Simulated CPUs are not + * supported since this would require the kernel to inject + * interrupt into the simulated CPU. + * </ul> + * + * @warn This GIC model cannot be used with simulated CPUs! + */ +class KvmGic : public BaseGic +{ + public: // SimObject / Serializable / Drainable + KvmGic(const KvmGicParams *p); + ~KvmGic(); + + void startup() M5_ATTR_OVERRIDE { verifyMemoryMode(); } + void drainResume() M5_ATTR_OVERRIDE { verifyMemoryMode(); } + + void serialize(std::ostream &os) M5_ATTR_OVERRIDE; + void unserialize(Checkpoint *cp, const std::string &sec) M5_ATTR_OVERRIDE; + + public: // PioDevice + AddrRangeList getAddrRanges() const { return addrRanges; } + Tick read(PacketPtr pkt) M5_ATTR_OVERRIDE; + Tick write(PacketPtr pkt) M5_ATTR_OVERRIDE; + + public: // BaseGic + void sendInt(uint32_t num) M5_ATTR_OVERRIDE; + void clearInt(uint32_t num) M5_ATTR_OVERRIDE; + + void sendPPInt(uint32_t num, uint32_t cpu) M5_ATTR_OVERRIDE; + void clearPPInt(uint32_t num, uint32_t cpu) M5_ATTR_OVERRIDE; + + protected: + /** + * Do memory mode sanity checks + * + * This method only really exists to warn users that try to switch + * to a simulate CPU. There is no fool proof method to detect + * simulated CPUs, but checking that we're in atomic mode and + * bypassing caches should be robust enough. + */ + void verifyMemoryMode() const; + + /** + * Update the kernel's VGIC interrupt state + * + * @param type Interrupt type (KVM_ARM_IRQ_TYPE_PPI/KVM_ARM_IRQ_TYPE_SPI) + * @param vcpu CPU id within KVM (ignored for SPIs) + * @param irq Interrupt number + * @param high True to signal an interrupt, false to clear it. + */ + void setIntState(uint8_t type, uint8_t vcpu, uint16_t irq, bool high); + + /** System this interrupt controller belongs to */ + System &system; + /** VM for this system */ + KvmVM &vm; + /** Kernel interface to the GIC */ + KvmDevice kdev; + + /** Address range for the distributor interface */ + const AddrRange distRange; + /** Address range for the CPU interfaces */ + const AddrRange cpuRange; + /** Union of all memory */ + const AddrRangeList addrRanges; +}; + +#endif // __ARCH_ARM_KVM_GIC_HH__ |