base_cpu.cc revision 11178:555325cbf464 
1/*
2 * Copyright (c) 2012, 2015 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/base_cpu.hh"
41
42#include <linux/kvm.h>
43
44#include "debug/KvmInt.hh"
45#include "params/BaseArmKvmCPU.hh"
46
47
48#define INTERRUPT_ID(type, vcpu, irq) (                    \
49        ((type) << KVM_ARM_IRQ_TYPE_SHIFT) |               \
50        ((vcpu) << KVM_ARM_IRQ_VCPU_SHIFT) |               \
51        ((irq) << KVM_ARM_IRQ_NUM_SHIFT))
52
53#define INTERRUPT_VCPU_IRQ(vcpu)                                \
54    INTERRUPT_ID(KVM_ARM_IRQ_TYPE_CPU, vcpu, KVM_ARM_IRQ_CPU_IRQ)
55
56#define INTERRUPT_VCPU_FIQ(vcpu)                                \
57    INTERRUPT_ID(KVM_ARM_IRQ_TYPE_CPU, vcpu, KVM_ARM_IRQ_CPU_FIQ)
58
59
60BaseArmKvmCPU::BaseArmKvmCPU(BaseArmKvmCPUParams *params)
61    : BaseKvmCPU(params),
62      irqAsserted(false), fiqAsserted(false)
63{
64}
65
66BaseArmKvmCPU::~BaseArmKvmCPU()
67{
68}
69
70void
71BaseArmKvmCPU::startup()
72{
73    BaseKvmCPU::startup();
74
75    /* TODO: This needs to be moved when we start to support VMs with
76     * multiple threads since kvmArmVCpuInit requires that all CPUs in
77     * the VM have been created.
78     */
79    struct kvm_vcpu_init target_config;
80    memset(&target_config, 0, sizeof(target_config));
81
82    vm.kvmArmPreferredTarget(target_config);
83    kvmArmVCpuInit(target_config);
84}
85
86Tick
87BaseArmKvmCPU::kvmRun(Tick ticks)
88{
89    bool simFIQ(interrupts[0]->checkRaw(INT_FIQ));
90    bool simIRQ(interrupts[0]->checkRaw(INT_IRQ));
91
92    if (fiqAsserted != simFIQ) {
93        fiqAsserted = simFIQ;
94        DPRINTF(KvmInt, "KVM: Update FIQ state: %i\n", simFIQ);
95        vm.setIRQLine(INTERRUPT_VCPU_FIQ(vcpuID), simFIQ);
96    }
97    if (irqAsserted != simIRQ) {
98        irqAsserted = simIRQ;
99        DPRINTF(KvmInt, "KVM: Update IRQ state: %i\n", simIRQ);
100        vm.setIRQLine(INTERRUPT_VCPU_IRQ(vcpuID), simIRQ);
101    }
102
103    return BaseKvmCPU::kvmRun(ticks);
104}
105
106const BaseArmKvmCPU::RegIndexVector &
107BaseArmKvmCPU::getRegList() const
108{
109    // Do we need to request a list of registers from the kernel?
110    if (_regIndexList.size() == 0) {
111        // Start by probing for the size of the list. We do this
112        // calling the ioctl with a struct size of 0. The kernel will
113        // return the number of elements required to hold the list.
114        kvm_reg_list regs_probe;
115        regs_probe.n = 0;
116        getRegList(regs_probe);
117
118        // Request the actual register list now that we know how many
119        // register we need to allocate space for.
120        std::unique_ptr<struct kvm_reg_list> regs;
121        const size_t size(sizeof(struct kvm_reg_list) +
122                          regs_probe.n * sizeof(uint64_t));
123        regs.reset((struct kvm_reg_list *)operator new(size));
124        regs->n = regs_probe.n;
125        if (!getRegList(*regs))
126            panic("Failed to determine register list size.\n");
127
128        _regIndexList.assign(regs->reg, regs->reg + regs->n);
129    }
130
131    return _regIndexList;
132}
133
134void
135BaseArmKvmCPU::kvmArmVCpuInit(const struct kvm_vcpu_init &init)
136{
137    if (ioctl(KVM_ARM_VCPU_INIT, (void *)&init) == -1)
138        panic("KVM: Failed to initialize vCPU\n");
139}
140
141bool
142BaseArmKvmCPU::getRegList(struct kvm_reg_list &regs) const
143{
144    if (ioctl(KVM_GET_REG_LIST, (void *)&regs) == -1) {
145        if (errno == E2BIG) {
146            return false;
147        } else {
148            panic("KVM: Failed to get vCPU register list (errno: %i)\n",
149                  errno);
150        }
151    } else {
152        return true;
153    }
154}
155