vm.cc revision 9651
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 <linux/kvm.h> 41#include <sys/ioctl.h> 42#include <sys/stat.h> 43#include <sys/types.h> 44#include <fcntl.h> 45#include <unistd.h> 46 47#include <cerrno> 48 49#include "cpu/kvm/vm.hh" 50#include "debug/Kvm.hh" 51#include "params/KvmVM.hh" 52#include "sim/system.hh" 53 54#define EXPECTED_KVM_API_VERSION 12 55 56#if EXPECTED_KVM_API_VERSION != KVM_API_VERSION 57#error Unsupported KVM version 58#endif 59 60Kvm *Kvm::instance = NULL; 61 62Kvm::Kvm() 63 : kvmFD(-1), apiVersion(-1), vcpuMMapSize(0) 64{ 65 kvmFD = ::open("/dev/kvm", O_RDWR); 66 if (kvmFD == -1) 67 fatal("KVM: Failed to open /dev/kvm\n"); 68 69 apiVersion = ioctl(KVM_GET_API_VERSION); 70 if (apiVersion != EXPECTED_KVM_API_VERSION) 71 fatal("KVM: Incompatible API version\n"); 72 73 vcpuMMapSize = ioctl(KVM_GET_VCPU_MMAP_SIZE); 74 if (vcpuMMapSize == -1) 75 panic("KVM: Failed to get virtual CPU MMAP size\n"); 76} 77 78Kvm::~Kvm() 79{ 80 close(kvmFD); 81} 82 83Kvm * 84Kvm::create() 85{ 86 if (!instance) 87 instance = new Kvm(); 88 89 return instance; 90} 91 92bool 93Kvm::capUserMemory() const 94{ 95 return checkExtension(KVM_CAP_USER_MEMORY) != 0; 96} 97 98bool 99Kvm::capSetTSSAddress() const 100{ 101 return checkExtension(KVM_CAP_SET_TSS_ADDR) != 0; 102} 103 104bool 105Kvm::capExtendedCPUID() const 106{ 107 return checkExtension(KVM_CAP_EXT_CPUID) != 0; 108} 109 110bool 111Kvm::capUserNMI() const 112{ 113#ifdef KVM_CAP_USER_NMI 114 return checkExtension(KVM_CAP_USER_NMI) != 0; 115#else 116 return false; 117#endif 118} 119 120int 121Kvm::capCoalescedMMIO() const 122{ 123 return checkExtension(KVM_CAP_COALESCED_MMIO); 124} 125 126bool 127Kvm::capOneReg() const 128{ 129#ifdef KVM_CAP_ONE_REG 130 return checkExtension(KVM_CAP_ONE_REG) != 0; 131#else 132 return false; 133#endif 134} 135 136bool 137Kvm::capIRQChip() const 138{ 139 return checkExtension(KVM_CAP_IRQCHIP) != 0; 140} 141 142bool 143Kvm::getSupportedCPUID(struct kvm_cpuid2 &cpuid) const 144{ 145#if defined(__i386__) || defined(__x86_64__) 146 if (ioctl(KVM_GET_SUPPORTED_CPUID, (void *)&cpuid) == -1) { 147 if (errno == E2BIG) 148 return false; 149 else 150 panic("KVM: Failed to get supported CPUID (errno: %i)\n", errno); 151 } else 152 return true; 153#else 154 panic("KVM: getSupportedCPUID is unsupported on this platform.\n"); 155#endif 156} 157 158int 159Kvm::checkExtension(int extension) const 160{ 161 int ret = ioctl(KVM_CHECK_EXTENSION, extension); 162 if (ret == -1) 163 panic("KVM: ioctl failed when checking for extension\n"); 164 return ret; 165} 166 167int 168Kvm::ioctl(int request, long p1) const 169{ 170 assert(kvmFD != -1); 171 172 return ::ioctl(kvmFD, request, p1); 173} 174 175int 176Kvm::createVM() 177{ 178 int vmFD; 179 180 vmFD = ioctl(KVM_CREATE_VM); 181 if (vmFD == -1) 182 panic("Failed to create KVM VM\n"); 183 184 return vmFD; 185} 186 187 188KvmVM::KvmVM(KvmVMParams *params) 189 : SimObject(params), 190 kvm(), system(params->system), 191 vmFD(kvm.createVM()), 192 started(false), 193 nextVCPUID(0) 194{ 195 /* Setup the coalesced MMIO regions */ 196 for (int i = 0; i < params->coalescedMMIO.size(); ++i) 197 coalesceMMIO(params->coalescedMMIO[i]); 198} 199 200KvmVM::~KvmVM() 201{ 202 close(vmFD); 203} 204 205void 206KvmVM::cpuStartup() 207{ 208 if (started) 209 return; 210 started = true; 211 212 delayedStartup(); 213} 214 215void 216KvmVM::delayedStartup() 217{ 218 const std::vector<std::pair<AddrRange, uint8_t*> >&memories( 219 system->getPhysMem().getBackingStore()); 220 221 DPRINTF(Kvm, "Mapping %i memory region(s)\n", memories.size()); 222 for (int slot(0); slot < memories.size(); ++slot) { 223 const AddrRange &range(memories[slot].first); 224 void *pmem(memories[slot].second); 225 226 if (pmem) { 227 DPRINTF(Kvm, "Mapping region: 0x%p -> 0x%llx [size: 0x%llx]\n", 228 pmem, range.start(), range.size()); 229 230 setUserMemoryRegion(slot, pmem, range, 0 /* flags */); 231 } else { 232 DPRINTF(Kvm, "Zero-region not mapped: [0x%llx]\n", range.start()); 233 hack("KVM: Zero memory handled as IO\n"); 234 } 235 } 236} 237 238void 239KvmVM::setUserMemoryRegion(uint32_t slot, 240 void *host_addr, AddrRange guest_range, 241 uint32_t flags) 242{ 243 if (guest_range.interleaved()) 244 panic("Tried to map an interleaved memory range into a KVM VM.\n"); 245 246 setUserMemoryRegion(slot, host_addr, 247 guest_range.start(), guest_range.size(), 248 flags); 249} 250 251void 252KvmVM::setUserMemoryRegion(uint32_t slot, 253 void *host_addr, Addr guest_addr, 254 uint64_t len, uint32_t flags) 255{ 256 struct kvm_userspace_memory_region m; 257 258 memset(&m, 0, sizeof(m)); 259 m.slot = slot; 260 m.flags = flags; 261 m.guest_phys_addr = (uint64_t)guest_addr; 262 m.memory_size = len; 263 m.userspace_addr = (__u64)host_addr; 264 265 if (ioctl(KVM_SET_USER_MEMORY_REGION, (void *)&m) == -1) { 266 panic("Failed to setup KVM memory region:\n" 267 "\tHost Address: 0x%p\n" 268 "\tGuest Address: 0x%llx\n", 269 "\tSize: %ll\n", 270 "\tFlags: 0x%x\n", 271 m.userspace_addr, m.guest_phys_addr, 272 m.memory_size, m.flags); 273 } 274} 275 276void 277KvmVM::coalesceMMIO(const AddrRange &range) 278{ 279 coalesceMMIO(range.start(), range.size()); 280} 281 282void 283KvmVM::coalesceMMIO(Addr start, int size) 284{ 285 struct kvm_coalesced_mmio_zone zone; 286 287 zone.addr = start; 288 zone.size = size; 289 zone.pad = 0; 290 291 DPRINTF(Kvm, "KVM: Registering coalesced MMIO region [0x%x, 0x%x]\n", 292 zone.addr, zone.addr + zone.size - 1); 293 if (ioctl(KVM_REGISTER_COALESCED_MMIO, (void *)&zone) == -1) 294 panic("KVM: Failed to register coalesced MMIO region (%i)\n", 295 errno); 296} 297 298void 299KvmVM::setTSSAddress(Addr tss_address) 300{ 301 if (ioctl(KVM_SET_TSS_ADDR, (unsigned long)tss_address) == -1) 302 panic("KVM: Failed to set VM TSS address\n"); 303} 304 305void 306KvmVM::createIRQChip() 307{ 308 if (_hasKernelIRQChip) 309 panic("KvmVM::createIRQChip called twice.\n"); 310 311 if (ioctl(KVM_CREATE_IRQCHIP) != -1) { 312 _hasKernelIRQChip = true; 313 } else { 314 warn("KVM: Failed to create in-kernel IRQ chip (errno: %i)\n", 315 errno); 316 _hasKernelIRQChip = false; 317 } 318} 319 320void 321KvmVM::setIRQLine(uint32_t irq, bool high) 322{ 323 struct kvm_irq_level kvm_level; 324 325 kvm_level.irq = irq; 326 kvm_level.level = high ? 1 : 0; 327 328 if (ioctl(KVM_IRQ_LINE, &kvm_level) == -1) 329 panic("KVM: Failed to set IRQ line level (errno: %i)\n", 330 errno); 331} 332 333int 334KvmVM::createVCPU(long vcpuID) 335{ 336 int fd; 337 338 fd = ioctl(KVM_CREATE_VCPU, vcpuID); 339 if (fd == -1) 340 panic("KVM: Failed to create virtual CPU"); 341 342 return fd; 343} 344 345long 346KvmVM::allocVCPUID() 347{ 348 return nextVCPUID++; 349} 350 351int 352KvmVM::ioctl(int request, long p1) const 353{ 354 assert(vmFD != -1); 355 356 return ::ioctl(vmFD, request, p1); 357} 358 359 360KvmVM * 361KvmVMParams::create() 362{ 363 static bool created = false; 364 if (created) 365 warn_once("Use of multiple KvmVMs is currently untested!\n"); 366 367 created = true; 368 369 return new KvmVM(this); 370} 371