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Martins3 / Martins3.github.io

:book: Scratchpad about Linux, Compiler and Virtualization

https://martins3.github.io

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KVM #22

Closed Martins3 closed 1 year ago

Martins3 commented 3 years ago

[x] virtio console
[x] vsock

Martins3 commented 3 years ago

[x] dirty log
[ ] mmu audit 选项

Martins3 commented 3 years ago

[ ] 当 Guest 需要切换到另一个 CPU 上的时候，是不是需要首先退出到 Host 中间，然后让 host 调度到其他的 CPU，最后重新进入到 guest mode。如果确实是，是遇到了什么苦难吗 ? 可以优化吗 ?

Martins3 commented 3 years ago

VCPU

[ ] 创建 : ioctl 的时候能够保证一个 vcpu 绑定到一个物理 CPU 上吗 ?
[ ] 如果两个 vcpu 分别隶属于两个虚拟机，kvm 如何管理的 ? 不同的虚拟机的 vcpu 可以在同一个 cpu 上吗？

Martins3 commented 3 years ago

主板虚拟化

[ ] why qemu need qboot to boot linux kernel
[ ] kvmtool doesn't have bios related stuff, how it works ?

Martins3 commented 3 years ago

hypervisor-from-scratch-part-4

[ ] https://github.com/kernelrookie/lite-kvm/issues/2 的 lite-kvm 的部分实现。

https://rayanfam.com/topics/hypervisor-from-scratch-part-4/

TODO intel 手册 Chapter 28 – (VMX SUPPORT FOR ADDRESS TRANSLATION)

According to a VMware evaluation paper: “EPT provides performance gains of up to 48% for MMU-intensive benchmarks and up to 600% for MMU-intensive microbenchmarks”.

[ ] 是 shadow table 需要使用 Complicated reverse map 的吗 ?

EPT mechanism that treats your Guest Physical Address like a virtual address and the EPTP is the CR3.

[ ] cr3 中间存放 eptp 的地址，找到对应的代码 ?

Note that PAE stands for Physical Address Extension which is a memory management feature for the x86 architecture that extends the address space and PSE stands for Page Size Extension that refers to a feature of x86 processors that allows for pages larger than the traditional 4 KiB size.

Martins3 commented 3 years ago

[ ] 理解各种管理器比如 multipass

Martins3 commented 3 years ago

[ ] A CPU is running a guest, will a time interrupt cause the guest to exit?
- [ ] If not, when will the interrupt be handled ?