【虚拟化】kernel OLK-5.10 supports KVM RISC-V

测试RISC-V虚拟化功能

1. 启动虚拟机
1.1 为仿真器配置虚拟网桥
$ brctl addbr virbr0
$ brctl stp virbr0 on
$ ifconfig virbr0 up
$ ifconfig virbr0 192.168.122.1 netmask 255.255.255.0

1.2 启动仿真器
$ ./qemu-system-riscv64 -M virt -m 4096M -cpu rv64,x-h=true -nographic \
    -name guest=riscv-hyp,debug-threads=on \
    -smp 4 \
    -bios ./fw_jump.bin \
    -kernel ./Image \
    -drive file=./hypervisor.img,format=raw,id=hd0 \
    -device virtio-blk-device,drive=hd0 \
    -append "root=/dev/vda rw console=ttyS0 earlycon=sbi" \
    -netdev type=tap,script=./ifup.sh,downscript=./ifdown.sh,id=net0 \
    -device virtio-net-device,netdev=net0
结果如下：
![输入图片说明](https://images.gitee.com/uploads/images/2020/1222/105400_d02c5773_7867572.png "屏幕截图.png")

1.3 启动RISC-V虚拟机
$ ./qemu-system-riscv64 -M virt,accel=kvm -m 512M -cpu host -nographic \
    -name guest=riscv-guest \
    -bios none \
    -smp 2 \
    -kernel ./Image \
    -drive file=./guest.img,format=raw,id=hd0 \
    -device virtio-blk,drive=hd0 \
    -append "root=/dev/vda rw console=ttyS0 earlycon=sbi"
结果如下：
![输入图片说明](https://images.gitee.com/uploads/images/2020/1222/111214_1584b385_7867572.png "屏幕截图.png")

2. 热迁移
2.1 在仿真器1上启动源端虚拟机
$ ./qemu-system-riscv64 -M virt,accel=kvm -m 512M -cpu host -nographic \
    -name guest=riscv-guest \
    -bios none \
    -smp 2 \
    -kernel ./Image \
    -drive file=./guest.img,format=raw,id=hd0 \
    -device virtio-blk,drive=hd0 \
    -append "root=/dev/vda rw console=ttyS0 earlycon=sbi" \
    -monitor tcp:0:55555,server,nowait \
2.2 在仿真器2上启动对端虚拟机，等待源端迁移
$ ./qemu-system-riscv64 -M virt,accel=kvm -m 512M -cpu host -nographic \
    -name guest=riscv-guest \
    -bios none \
    -smp 2 \
    -kernel ./Image \
    -drive file=./guest.img,format=raw,id=hd0 \
    -device virtio-blk,drive=hd0 \
    -append "root=/dev/vda rw console=ttyS0 earlycon=sbi" \
    -device i6300esb,id=watchdog \
    -serial tcp:0:33333,server,nowait \
    -incoming tcp:0:44444 \
    -monitor tcp:0:55555,server,nowait

2.3 登录仿真器1，启动热迁移
$ socat -,echo=0,icanon=0 tcp-connect:192.168.122.2:55555
(qemu) migrate -d -i tcp:192.168.122.3:44444

2.4 登录热迁移后的虚拟机
$ socat -,echo=0,icanon=0 tcp-connect:192.168.122.3:33333
结果如下：
![输入图片说明](https://images.gitee.com/uploads/images/2020/1222/112612_435c6ee8_7867572.png "屏幕截图.png")

已合入如下相关补丁：
bb420cf9aa96 RISCV: KVM: fix bug in migration
8d9fb94def6d RISC-V: Enable KVM for RV64 and RV32
0fb0f6010791 RISC-V: KVM: Add MAINTAINERS entry
94249beff832 RISC-V: KVM: Document RISC-V specific parts of KVM API
7b4c2ba99524 RISC-V: KVM: Add SBI v0.1 support
1740d169ec24 RISC-V: KVM: Implement ONE REG interface for FP registers
d58a09d981c6 RISC-V: KVM: FP lazy save/restore
5d694703a4df RISC-V: KVM: Add timer functionality
3bba8056692e RISC-V: KVM: Implement MMU notifiers
4c99be36676d RISC-V: KVM: Implement stage2 page table programming
f2c078138b96 RISC-V: KVM: Implement VMID allocator
ac864e222df9 RISC-V: KVM: Handle WFI exits for VCPU
76580c26bfaf RISC-V: KVM: Handle MMIO exits for VCPU
a8c4fcfe6cca RISC-V: KVM: Implement VCPU world-switch
5fbaad69b54f RISC-V: KVM: Implement KVM_GET_ONE_REG/KVM_SET_ONE_REG ioctls
712a392a1ee1 RISC-V: KVM: Implement VCPU interrupts and requests handling
547754bf9ebe RISC-V: KVM: Implement VCPU create, init and destroy functions
e91613aec0b9 RISC-V: Add initial skeletal KVM support
145b00007b88 RISC-V: Add hypervisor extension related CSR defines
ddc1d948927c RISC-V: Enable drivers for Microchip PolarFire ICICLE board
41e926e6ead2 RISC-V: Initial DTS for Microchip ICICLE board
ee81ec41a2d0 RISC-V: Add Microchip PolarFire kconfig option
b87003a9d82f Microchip Polarfire SoC Clock Driver
ff85bc34763a RISC-V: Enable CPU Hotplug in defconfigs
3693aa3de291 Revert "riscv: Use latest system call ABI"
688923d14395 RISC-V: Add fragmented config for debug options

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