本仓库包含一个 VMM，它使用自定义内核启动 SEV-SNP 虚拟机。该 VMM 和内核是我个人项目的一个精简版本。需要在主机上运行经过修改的 Linux 内核：https://github.com/Freax13/linux/tree/for-amd。
可按照以下方式运行概念验证：
cd host
cargo run -p vmm
该代码在两条指令之间来回跳转：
2:
nop
jmp 2b
当 FLAGS 寄存器中的 TF 标志被设置时，异常应被生成，且指令指针将在两条指令之间交替。
客户机内核定义了一个异常处理程序，仅记录中断栈帧中报告的指令指针。理论上，日志应如下所示：
...
[INFO kernel/src/exception.rs:50] nop
[INFO kernel/src/exception.rs:56] jmp
[INFO kernel/src/exception.rs:50] nop
[INFO kernel/src/exception.rs:56] jmp
[INFO kernel/src/exception.rs:50] nop
[INFO kernel/src/exception.rs:56] jmp
[INFO kernel/src/exception.rs:50] nop
[INFO kernel/src/exception.rs:56] jmp
[INFO kernel/src/exception.rs:50] nop
[INFO kernel/src/exception.rs:56] jmp
[INFO kernel/src/exception.rs:50] nop
[INFO kernel/src/exception.rs:56] jmp
...
然而，在实际情况下，经过修改的主机内核抑制了重新注入，导致以下日志：
...
[INFO kernel/src/exception.rs:56] jmp
[INFO kernel/src/exception.rs:50] nop
[INFO kernel/src/exception.rs:56] jmp
[INFO kernel/src/exception.rs:50] nop
[INFO kernel/src/exception.rs:50] nop
[INFO kernel/src/exception.rs:53] 上一条指令也是 nop
[INFO kernel/src/exception.rs:56] jmp
[INFO kernel/src/exception.rs:50] nop
[INFO kernel/src/exception.rs:56] jmp
[INFO kernel/src/exception.rs:50] nop
[INFO kernel/src/exception.rs:56] jmp
[INFO kernel/src/exception.rs:50] nop
[INFO kernel/src/exception.rs:56] jmp
[INFO kernel/src/exception.rs:56] jmp
[INFO kernel/src/exception.rs:59] 上一条指令也是 jmp
[INFO kernel/src/exception.rs:50] nop
[INFO kernel/src/exception.rs:56] jmp
[INFO kernel/src/exception.rs:50] nop
...
被抑制的事件将出现在主机内核日志中：
...
[798678.660473] kvm_amd: exit_int_info=80000301 exit_info_1=500000004 exit_info_2=180000000 exit_code=400
[798678.678645] kvm_amd: exit_int_info=80000301 exit_info_1=500000004 exit_info_2=180000000 exit_code=400
[798678.680906] kvm_amd: exit_int_info=80000301 exit_info_1=500000004 exit_info_2=180000000 exit_code=400
[798678.683491] kvm_amd: exit_int_info=80000301 exit_info_1=500000004 exit_info_2=180000000 exit_code=400
[798678.700844] kvm_amd: exit_int_info=80000301 exit_info_1=500000004 exit_info_2=180000000 exit_code=400
[798678.712970] kvm_amd: exit_int_info=80000301 exit_info_1=500000004 exit_info_2=180000000 exit_code=400
...
这表明 #DB 异常的投递被抑制了。