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/*
* Copyright (C) 2018 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#pragma once
#include <memory>
#include <string>
#include <unordered_map>
#include <vector>
#include <fruit/fruit.h>
#include "common/libs/utils/result.h"
#include "host/libs/config/command_source.h"
#include "host/libs/config/cuttlefish_config.h"
namespace cuttlefish {
namespace vm_manager {
// Superclass of every guest VM manager.
class VmManager {
public:
// This is the number of HVC virtual console ports that should be configured
// by the VmManager. Because crosvm currently allocates these ports as the
// first PCI devices, and it does not control the allocation of PCI ID
// assignments, the number of these ports affects the PCI paths for
// subsequent PCI devices, and these paths are hard-coded in SEPolicy.
// Fortunately, HVC virtual console ports can be set up to be "sink" devices,
// so even if they are disabled and the guest isn't using them, they don't
// need to consume host resources, except for the PCI ID. Use this trick to
// keep the number of PCI IDs assigned constant for all flags/vm manager
// combinations
static const int kDefaultNumHvcs = 10;
// This is the number of virtual disks (block devices) that should be
// configured by the VmManager. Related to the description above regarding
// HVC ports, this problem can also affect block devices (which are
// enumerated second) if not all of the block devices are available. Unlike
// HVC virtual console ports, block devices cannot be configured to be sinks,
// so we once again leverage HVC virtual console ports to "bump up" the last
// assigned virtual disk PCI ID (i.e. 2 disks = 7 hvcs, 1 disks = 8 hvcs)
static constexpr int kMaxDisks = 3;
// This is the number of virtual disks that contribute to the named partition
// list (/dev/block/by-name/*) under Android. The partitions names from
// multiple disks *must not* collide. Normally we have one set of partitions
// from the powerwashed disk (operating system disk) and another set from
// the persistent disk
static const int kDefaultNumBootDevices = 2;
virtual ~VmManager() = default;
virtual bool IsSupported() = 0;
virtual Result<std::unordered_map<std::string, std::string>>
ConfigureGraphics(const CuttlefishConfig::InstanceSpecific& instance) = 0;
virtual Result<std::unordered_map<std::string, std::string>>
ConfigureBootDevices(int num_disks, bool have_gpu) = 0;
// Starts the VMM. It will usually build a command and pass it to the
// command_starter function, although it may start more than one. The
// command_starter function allows to customize the way vmm commands are
// started/tracked/etc.
virtual Result<std::vector<MonitorCommand>> StartCommands(
const CuttlefishConfig& config) = 0;
};
fruit::Component<fruit::Required<const CuttlefishConfig,
const CuttlefishConfig::InstanceSpecific>,
VmManager>
VmManagerComponent();
std::unique_ptr<VmManager> GetVmManager(const std::string&, Arch arch);
Result<std::unordered_map<std::string, std::string>>
ConfigureMultipleBootDevices(const std::string& pci_path, int pci_offset,
int num_disks);
} // namespace vm_manager
} // namespace cuttlefish
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