DragonOS虚拟化 (#389)

* try some ioctl flow & kvm device

* add sys ioctl

* 删掉一些debug信息

* 修改run-qemu.sh脚本，在QEMU中enable vmx

* 修改cr0,cr4,msr寄存器enable VMX operations

* enable vmx operation

* allocate memory for vmcs with bug

* allocate memory for vmcs

* cpu virt-50%

* single vcpu virt

* add vmcs fields

* CPU virt overall flow with bug

* run vmlaunch success

* run CPU virt with bug

* 成功运行non-root模式的guest

* 成功运行vmexit,进入vmx_return函数

* 成功运行vmlaunch, vmexit, vmresume

* vmexit handler with bug

* 完成vmexit cpuid handler

* fix vmresume guest状态恢复的bug

* 增加vm ioctl

* refactor kvm 50%

* refactor kvm 80%

* FIXME: kvm vmlaunch failed

* vmlaunch success

* FIXME: output error

* update guest_rsp

* cpu virt refactor

* add mmu related struct

* add usermemory region workflow

* add mem-virt workflow

* add mem-virt

* refactor code

* add vcpu ioctl set_regs

* rename hypervisor to vm & solve some deadlock bugs

* workout mem pipeline

* fix vmcs control setting bugs

* refactor segment regs initialization

* resovle conficts

* resovle conficts

* format code

user/libs/libsystem/syscall.h

@@ -49,6 +49,7 @@
 #define SYS_ACCEPT 40     // 接受一个socket连接
 #define SYS_GETSOCKNAME 41 // 获取socket的名字
 #define SYS_GETPEERNAME 42 // 获取socket的对端名字
+#define SYS_IOCTL 54
 
 #define SYS_GETCWD 48