QEMU源码全解析 —— 内存虚拟化（2）

蓝天居士2024-02-03 12:12

接前一篇文章：

本文内容参考：

《趣谈Linux操作系统》 ------ 刘超，极客时间

《QEMU/KVM》源码解析与应用 ------ 李强，机械工业出版社

QEMU内存管理模型

特此致谢！

QEMU内存初始化

1. 基本结构

在开始介绍内存初始化的时候，首先需要对QEMU中几个与内存相关的数据结构进行介绍。

（1）AddressSpace

首先是AddressSpace结构。AddressSpace结构用来表示一个虚拟机或者虚拟CPU能够访问的所有物理地址。注意，这里的"访问"和"能够访问"并不是一回事。与进程的地址空间一样，一个进程的虚拟地址空间为4GB（32位），但这并不是说操作系统需要为进程分配这么大的空间。同样，QEMU中的AddressSpace表示的是一段地址空间，整个系统可以有一个全局的地址空间，CPU可以有自己的地址空间视角，设备也可以有自己的地址空间视角。

AddressSpace的定义在include/qemu/typedefs.h中，如下：

cpp 复制代码 
typedef struct AddressSpace AddressSpace;

而struct AddressSpace的定义在include/exec/memory.h中，代码如下：

cpp 复制代码 
/**
 * struct AddressSpace: describes a mapping of addresses to #MemoryRegion objects
 */
struct AddressSpace {
    /* private: */
    struct rcu_head rcu;
    char *name;
    MemoryRegion *root;

    /* Accessed via RCU.  */
    struct FlatView *current_map;

    int ioeventfd_nb;
    struct MemoryRegionIoeventfd *ioeventfds;
    QTAILQ_HEAD(, MemoryListener) listeners;
    QTAILQ_ENTRY(AddressSpace) address_spaces_link;
};

根据struct AddressSpace的注释，此结构描述了一个到MemoryRegion对象的地址映射。

其中：

  • MemoryRegion *root成员表示AddressSpace对应的一个根MemoryRegion。
  • struct FlatView *current_map成员表示该地址空间是一个平坦模式下的视图。
  • QEMU的其它子系统可以注册地址变更的事件，所有注册的信息都通过QTAILQ_HEAD(, MemoryListener) listeners成员连接起来。
  • 所有的AddressSpace通过address_spaces_link这个node连接起来（QTAILQ_ENTRY(AddressSpace) address_spaces_link），链表头是address_spaces。

在QEMU monitor中输入"info qtree"，可以看到所有的AddressSpace，如下所示：

bash 复制代码 
$ qemu-system-x86_64 -vnc :1 -monitor stdio
QEMU 6.2.0 monitor - type 'help' for more information
(qemu) info mtree
address-space: memory
  0000000000000000-ffffffffffffffff (prio 0, i/o): system
    0000000000000000-0000000007ffffff (prio 0, ram): alias ram-below-4g @pc.ram 0000000000000000-0000000007ffffff
    0000000000000000-ffffffffffffffff (prio -1, i/o): pci
      00000000000a0000-00000000000bffff (prio 1, i/o): vga-lowmem
      00000000000c0000-00000000000dffff (prio 1, rom): pc.rom
      00000000000e0000-00000000000fffff (prio 1, rom): alias isa-bios @pc.bios 0000000000020000-000000000003ffff
      00000000fd000000-00000000fdffffff (prio 1, ram): vga.vram
      00000000feb80000-00000000feb9ffff (prio 1, i/o): e1000-mmio
      00000000febb0000-00000000febb0fff (prio 1, i/o): vga.mmio
        00000000febb0000-00000000febb017f (prio 0, i/o): edid
        00000000febb0400-00000000febb041f (prio 0, i/o): vga ioports remapped
        00000000febb0500-00000000febb0515 (prio 0, i/o): bochs dispi interface
        00000000febb0600-00000000febb0607 (prio 0, i/o): qemu extended regs
      00000000fffc0000-00000000ffffffff (prio 0, rom): pc.bios
    00000000000a0000-00000000000bffff (prio 1, i/o): alias smram-region @pci 00000000000a0000-00000000000bffff
    00000000000c0000-00000000000c3fff (prio 1, ram): alias pam-rom @pc.ram 00000000000c0000-00000000000c3fff
    00000000000c4000-00000000000c7fff (prio 1, ram): alias pam-rom @pc.ram 00000000000c4000-00000000000c7fff
    00000000000c8000-00000000000cbfff (prio 1, ram): alias pam-rom @pc.ram 00000000000c8000-00000000000cbfff
    00000000000cb000-00000000000cdfff (prio 1000, ram): alias kvmvapic-rom @pc.ram 00000000000cb000-00000000000cdfff
    00000000000cc000-00000000000cffff (prio 1, ram): alias pam-rom @pc.ram 00000000000cc000-00000000000cffff
    00000000000d0000-00000000000d3fff (prio 1, ram): alias pam-rom @pc.ram 00000000000d0000-00000000000d3fff
    00000000000d4000-00000000000d7fff (prio 1, ram): alias pam-rom @pc.ram 00000000000d4000-00000000000d7fff
    00000000000d8000-00000000000dbfff (prio 1, ram): alias pam-rom @pc.ram 00000000000d8000-00000000000dbfff
    00000000000dc000-00000000000dffff (prio 1, ram): alias pam-rom @pc.ram 00000000000dc000-00000000000dffff
    00000000000e0000-00000000000e3fff (prio 1, ram): alias pam-rom @pc.ram 00000000000e0000-00000000000e3fff
    00000000000e4000-00000000000e7fff (prio 1, ram): alias pam-rom @pc.ram 00000000000e4000-00000000000e7fff
    00000000000e8000-00000000000ebfff (prio 1, ram): alias pam-ram @pc.ram 00000000000e8000-00000000000ebfff
    00000000000ec000-00000000000effff (prio 1, ram): alias pam-ram @pc.ram 00000000000ec000-00000000000effff
    00000000000f0000-00000000000fffff (prio 1, ram): alias pam-rom @pc.ram 00000000000f0000-00000000000fffff
    00000000fec00000-00000000fec00fff (prio 0, i/o): ioapic
    00000000fed00000-00000000fed003ff (prio 0, i/o): hpet
    00000000fee00000-00000000feefffff (prio 4096, i/o): apic-msi

address-space: I/O
  0000000000000000-000000000000ffff (prio 0, i/o): io
    0000000000000000-0000000000000007 (prio 0, i/o): dma-chan
    0000000000000008-000000000000000f (prio 0, i/o): dma-cont
    0000000000000020-0000000000000021 (prio 0, i/o): pic
    0000000000000040-0000000000000043 (prio 0, i/o): pit
    0000000000000060-0000000000000060 (prio 0, i/o): i8042-data
    0000000000000061-0000000000000061 (prio 0, i/o): pcspk
    0000000000000064-0000000000000064 (prio 0, i/o): i8042-cmd
    0000000000000070-0000000000000071 (prio 0, i/o): rtc
      0000000000000070-0000000000000070 (prio 0, i/o): rtc-index
    000000000000007e-000000000000007f (prio 0, i/o): kvmvapic
    0000000000000080-0000000000000080 (prio 0, i/o): ioport80
    0000000000000081-0000000000000083 (prio 0, i/o): dma-page
    0000000000000087-0000000000000087 (prio 0, i/o): dma-page
    0000000000000089-000000000000008b (prio 0, i/o): dma-page
    000000000000008f-000000000000008f (prio 0, i/o): dma-page
    0000000000000092-0000000000000092 (prio 0, i/o): port92
    00000000000000a0-00000000000000a1 (prio 0, i/o): pic
    00000000000000b2-00000000000000b3 (prio 0, i/o): apm-io
    00000000000000c0-00000000000000cf (prio 0, i/o): dma-chan
    00000000000000d0-00000000000000df (prio 0, i/o): dma-cont
    00000000000000f0-00000000000000f0 (prio 0, i/o): ioportF0
    0000000000000170-0000000000000177 (prio 0, i/o): ide
    00000000000001ce-00000000000001d1 (prio 0, i/o): vbe
    00000000000001f0-00000000000001f7 (prio 0, i/o): ide
    0000000000000376-0000000000000376 (prio 0, i/o): ide
    0000000000000378-000000000000037f (prio 0, i/o): parallel
    00000000000003b4-00000000000003b5 (prio 0, i/o): vga
    00000000000003ba-00000000000003ba (prio 0, i/o): vga
    00000000000003c0-00000000000003cf (prio 0, i/o): vga
    00000000000003d4-00000000000003d5 (prio 0, i/o): vga
    00000000000003da-00000000000003da (prio 0, i/o): vga
    00000000000003f1-00000000000003f5 (prio 0, i/o): fdc
    00000000000003f6-00000000000003f6 (prio 0, i/o): ide
    00000000000003f7-00000000000003f7 (prio 0, i/o): fdc
    00000000000003f8-00000000000003ff (prio 0, i/o): serial
    00000000000004d0-00000000000004d0 (prio 0, i/o): elcr
    00000000000004d1-00000000000004d1 (prio 0, i/o): elcr
    0000000000000510-0000000000000511 (prio 0, i/o): fwcfg
    0000000000000514-000000000000051b (prio 0, i/o): fwcfg.dma
    0000000000000600-000000000000063f (prio 0, i/o): piix4-pm
      0000000000000600-0000000000000603 (prio 0, i/o): acpi-evt
      0000000000000604-0000000000000605 (prio 0, i/o): acpi-cnt
      0000000000000608-000000000000060b (prio 0, i/o): acpi-tmr
    0000000000000700-000000000000073f (prio 0, i/o): pm-smbus
    0000000000000cf8-0000000000000cfb (prio 0, i/o): pci-conf-idx
    0000000000000cf9-0000000000000cf9 (prio 1, i/o): piix3-reset-control
    0000000000000cfc-0000000000000cff (prio 0, i/o): pci-conf-data
    0000000000005658-0000000000005658 (prio 0, i/o): vmport
    000000000000ae00-000000000000ae17 (prio 0, i/o): acpi-pci-hotplug
    000000000000af00-000000000000af1f (prio 0, i/o): acpi-cpu-hotplug
    000000000000afe0-000000000000afe3 (prio 0, i/o): acpi-gpe0
    000000000000c000-000000000000c03f (prio 1, i/o): e1000-io
    000000000000c040-000000000000c04f (prio 1, i/o): piix-bmdma-container
      000000000000c040-000000000000c043 (prio 0, i/o): piix-bmdma
      000000000000c044-000000000000c047 (prio 0, i/o): bmdma
      000000000000c048-000000000000c04b (prio 0, i/o): piix-bmdma
      000000000000c04c-000000000000c04f (prio 0, i/o): bmdma

address-space: cpu-memory-0
  0000000000000000-ffffffffffffffff (prio 0, i/o): system
    0000000000000000-0000000007ffffff (prio 0, ram): alias ram-below-4g @pc.ram 0000000000000000-0000000007ffffff
    0000000000000000-ffffffffffffffff (prio -1, i/o): pci
      00000000000a0000-00000000000bffff (prio 1, i/o): vga-lowmem
      00000000000c0000-00000000000dffff (prio 1, rom): pc.rom
      00000000000e0000-00000000000fffff (prio 1, rom): alias isa-bios @pc.bios 0000000000020000-000000000003ffff
      00000000fd000000-00000000fdffffff (prio 1, ram): vga.vram
      00000000feb80000-00000000feb9ffff (prio 1, i/o): e1000-mmio
      00000000febb0000-00000000febb0fff (prio 1, i/o): vga.mmio
        00000000febb0000-00000000febb017f (prio 0, i/o): edid
        00000000febb0400-00000000febb041f (prio 0, i/o): vga ioports remapped
        00000000febb0500-00000000febb0515 (prio 0, i/o): bochs dispi interface
        00000000febb0600-00000000febb0607 (prio 0, i/o): qemu extended regs
      00000000fffc0000-00000000ffffffff (prio 0, rom): pc.bios
    00000000000a0000-00000000000bffff (prio 1, i/o): alias smram-region @pci 00000000000a0000-00000000000bffff
    00000000000c0000-00000000000c3fff (prio 1, ram): alias pam-rom @pc.ram 00000000000c0000-00000000000c3fff
    00000000000c4000-00000000000c7fff (prio 1, ram): alias pam-rom @pc.ram 00000000000c4000-00000000000c7fff
    00000000000c8000-00000000000cbfff (prio 1, ram): alias pam-rom @pc.ram 00000000000c8000-00000000000cbfff
    00000000000cb000-00000000000cdfff (prio 1000, ram): alias kvmvapic-rom @pc.ram 00000000000cb000-00000000000cdfff
    00000000000cc000-00000000000cffff (prio 1, ram): alias pam-rom @pc.ram 00000000000cc000-00000000000cffff
    00000000000d0000-00000000000d3fff (prio 1, ram): alias pam-rom @pc.ram 00000000000d0000-00000000000d3fff
    00000000000d4000-00000000000d7fff (prio 1, ram): alias pam-rom @pc.ram 00000000000d4000-00000000000d7fff
    00000000000d8000-00000000000dbfff (prio 1, ram): alias pam-rom @pc.ram 00000000000d8000-00000000000dbfff
    00000000000dc000-00000000000dffff (prio 1, ram): alias pam-rom @pc.ram 00000000000dc000-00000000000dffff
    00000000000e0000-00000000000e3fff (prio 1, ram): alias pam-rom @pc.ram 00000000000e0000-00000000000e3fff
    00000000000e4000-00000000000e7fff (prio 1, ram): alias pam-rom @pc.ram 00000000000e4000-00000000000e7fff
    00000000000e8000-00000000000ebfff (prio 1, ram): alias pam-ram @pc.ram 00000000000e8000-00000000000ebfff
    00000000000ec000-00000000000effff (prio 1, ram): alias pam-ram @pc.ram 00000000000ec000-00000000000effff
    00000000000f0000-00000000000fffff (prio 1, ram): alias pam-rom @pc.ram 00000000000f0000-00000000000fffff
    00000000fec00000-00000000fec00fff (prio 0, i/o): ioapic
    00000000fed00000-00000000fed003ff (prio 0, i/o): hpet
    00000000fee00000-00000000feefffff (prio 4096, i/o): apic-msi

address-space: cpu-smm-0
  0000000000000000-ffffffffffffffff (prio 0, i/o): memory
    0000000000000000-00000000ffffffff (prio 1, i/o): alias smram @smram 0000000000000000-00000000ffffffff
    0000000000000000-ffffffffffffffff (prio 0, i/o): alias memory @system 0000000000000000-ffffffffffffffff

address-space: i440FX
  0000000000000000-ffffffffffffffff (prio 0, i/o): bus master container

address-space: PIIX3
  0000000000000000-ffffffffffffffff (prio 0, i/o): bus master container

address-space: VGA
  0000000000000000-ffffffffffffffff (prio 0, i/o): bus master container

address-space: e1000
  0000000000000000-ffffffffffffffff (prio 0, i/o): bus master container
    0000000000000000-ffffffffffffffff (prio 0, i/o): alias bus master @system 0000000000000000-ffffffffffffffff

address-space: piix3-ide
  0000000000000000-ffffffffffffffff (prio 0, i/o): bus master container

address-space: PIIX4_PM
  0000000000000000-ffffffffffffffff (prio 0, i/o): bus master container

memory-region: pc.ram
  0000000000000000-0000000007ffffff (prio 0, ram): pc.ram

memory-region: pc.bios
  00000000fffc0000-00000000ffffffff (prio 0, rom): pc.bios

memory-region: pci
  0000000000000000-ffffffffffffffff (prio -1, i/o): pci
    00000000000a0000-00000000000bffff (prio 1, i/o): vga-lowmem
    00000000000c0000-00000000000dffff (prio 1, rom): pc.rom
    00000000000e0000-00000000000fffff (prio 1, rom): alias isa-bios @pc.bios 0000000000020000-000000000003ffff
    00000000fd000000-00000000fdffffff (prio 1, ram): vga.vram
    00000000feb80000-00000000feb9ffff (prio 1, i/o): e1000-mmio
    00000000febb0000-00000000febb0fff (prio 1, i/o): vga.mmio
      00000000febb0000-00000000febb017f (prio 0, i/o): edid
      00000000febb0400-00000000febb041f (prio 0, i/o): vga ioports remapped
      00000000febb0500-00000000febb0515 (prio 0, i/o): bochs dispi interface
      00000000febb0600-00000000febb0607 (prio 0, i/o): qemu extended regs
    00000000fffc0000-00000000ffffffff (prio 0, rom): pc.bios

memory-region: smram
  0000000000000000-00000000ffffffff (prio 0, i/o): smram
    00000000000a0000-00000000000bffff (prio 0, ram): alias smram-low @pc.ram 00000000000a0000-00000000000bffff

memory-region: system
  0000000000000000-ffffffffffffffff (prio 0, i/o): system
    0000000000000000-0000000007ffffff (prio 0, ram): alias ram-below-4g @pc.ram 0000000000000000-0000000007ffffff
    0000000000000000-ffffffffffffffff (prio -1, i/o): pci
      00000000000a0000-00000000000bffff (prio 1, i/o): vga-lowmem
      00000000000c0000-00000000000dffff (prio 1, rom): pc.rom
      00000000000e0000-00000000000fffff (prio 1, rom): alias isa-bios @pc.bios 0000000000020000-000000000003ffff
      00000000fd000000-00000000fdffffff (prio 1, ram): vga.vram
      00000000feb80000-00000000feb9ffff (prio 1, i/o): e1000-mmio
      00000000febb0000-00000000febb0fff (prio 1, i/o): vga.mmio
        00000000febb0000-00000000febb017f (prio 0, i/o): edid
        00000000febb0400-00000000febb041f (prio 0, i/o): vga ioports remapped
        00000000febb0500-00000000febb0515 (prio 0, i/o): bochs dispi interface
        00000000febb0600-00000000febb0607 (prio 0, i/o): qemu extended regs
      00000000fffc0000-00000000ffffffff (prio 0, rom): pc.bios
    00000000000a0000-00000000000bffff (prio 1, i/o): alias smram-region @pci 00000000000a0000-00000000000bffff
    00000000000c0000-00000000000c3fff (prio 1, ram): alias pam-rom @pc.ram 00000000000c0000-00000000000c3fff
    00000000000c4000-00000000000c7fff (prio 1, ram): alias pam-rom @pc.ram 00000000000c4000-00000000000c7fff
    00000000000c8000-00000000000cbfff (prio 1, ram): alias pam-rom @pc.ram 00000000000c8000-00000000000cbfff
    00000000000cb000-00000000000cdfff (prio 1000, ram): alias kvmvapic-rom @pc.ram 00000000000cb000-00000000000cdfff
    00000000000cc000-00000000000cffff (prio 1, ram): alias pam-rom @pc.ram 00000000000cc000-00000000000cffff
    00000000000d0000-00000000000d3fff (prio 1, ram): alias pam-rom @pc.ram 00000000000d0000-00000000000d3fff
    00000000000d4000-00000000000d7fff (prio 1, ram): alias pam-rom @pc.ram 00000000000d4000-00000000000d7fff
    00000000000d8000-00000000000dbfff (prio 1, ram): alias pam-rom @pc.ram 00000000000d8000-00000000000dbfff
    00000000000dc000-00000000000dffff (prio 1, ram): alias pam-rom @pc.ram 00000000000dc000-00000000000dffff
    00000000000e0000-00000000000e3fff (prio 1, ram): alias pam-rom @pc.ram 00000000000e0000-00000000000e3fff
    00000000000e4000-00000000000e7fff (prio 1, ram): alias pam-rom @pc.ram 00000000000e4000-00000000000e7fff
    00000000000e8000-00000000000ebfff (prio 1, ram): alias pam-ram @pc.ram 00000000000e8000-00000000000ebfff
    00000000000ec000-00000000000effff (prio 1, ram): alias pam-ram @pc.ram 00000000000ec000-00000000000effff
    00000000000f0000-00000000000fffff (prio 1, ram): alias pam-rom @pc.ram 00000000000f0000-00000000000fffff
    00000000fec00000-00000000fec00fff (prio 0, i/o): ioapic
    00000000fed00000-00000000fed003ff (prio 0, i/o): hpet
    00000000fee00000-00000000feefffff (prio 4096, i/o): apic-msi
  • address-space: memory

第一个是系统全局的AddressSpace，表示虚拟机能够访问的所有地址。

  • address-space: I/O

I/O表示x86系统下I/O端口的地址空间。

  • address-space: cpu-memory-0

cpu-memory-x表示CPU视角下的地址空间。

  • i440FX和PIIX3

i440FX和PIIX3是设备视角下的地址空间，虽然大部分情况下很多都是相同的，但是逻辑意义并不一样。

至此，QEMU中与内存相关的第一个数据结构AddressSpace就讲解完了。

（2）MemoryRegion

第二个是基本数据结构是MemoryRegion。MemoryRegion结构的定义在include/exec/memory.h中，如下：

cpp 复制代码 
#define TYPE_MEMORY_REGION "memory-region"
DECLARE_INSTANCE_CHECKER(MemoryRegion, MEMORY_REGION,
                         TYPE_MEMORY_REGION)

在此不详细展开宏，而直接给出struct MemoryRegion定义，也在include/exec/memory.h中，代码如下：

cpp 复制代码 
/** MemoryRegion:
 *
 * A struct representing a memory region.
 */
struct MemoryRegion {
    Object parent_obj;

    /* private: */

    /* The following fields should fit in a cache line */
    bool romd_mode;
    bool ram;
    bool subpage;
    bool readonly; /* For RAM regions */
    bool nonvolatile;
    bool rom_device;
    bool flush_coalesced_mmio;
    uint8_t dirty_log_mask;
    bool is_iommu;
    RAMBlock *ram_block;
    Object *owner;
    /* owner as TYPE_DEVICE. Used for re-entrancy checks in MR access hotpath */
    DeviceState *dev;

    const MemoryRegionOps *ops;
    void *opaque;
    MemoryRegion *container;
    int mapped_via_alias; /* Mapped via an alias, container might be NULL */
    Int128 size;
    hwaddr addr;
    void (*destructor)(MemoryRegion *mr);
    uint64_t align;
    bool terminates;
    bool ram_device;
    bool enabled;
    bool warning_printed; /* For reservations */
    uint8_t vga_logging_count;
    MemoryRegion *alias;
    hwaddr alias_offset;
    int32_t priority;
    QTAILQ_HEAD(, MemoryRegion) subregions;
    QTAILQ_ENTRY(MemoryRegion) subregions_link;
    QTAILQ_HEAD(, CoalescedMemoryRange) coalesced;
    const char *name;
    unsigned ioeventfd_nb;
    MemoryRegionIoeventfd *ioeventfds;
    RamDiscardManager *rdm; /* Only for RAM */

    /* For devices designed to perform re-entrant IO into their own IO MRs */
    bool disable_reentrancy_guard;
};

MemoryRegion表示的是虚拟机中的一段内存区域 （对比：AddressSpace结构用来表示一个虚拟机或者虚拟CPU能够访问的所有物理地址，其描述了一个到MemoryRegion对象的地址映射）。MemoryRegion是内存模拟中的核心结构，整个内存的模拟都是通过MemoryRegion构成的无环图完成的。图的叶子节点是实际分配给虚拟机的物理内存或者MMIO，中间节点则表示内存总线，内存控制是其它MemoryRegion的别名。AddressSpace与MemoryRegion的关系如下图所示：

对于MemoryRegion各成员的详细讲解，请看下回。

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