69 lines
2.3 KiB
C
69 lines
2.3 KiB
C
|
/* linux_resume.c — Linux guest park-and-resume 唤醒实现。
|
|||
|
|
*
|
|||
|
|
* linux_resume() 通过 vmresume 唤醒已 HLT park 的 Linux guest。
|
|||
|
|
* guest daemon 处理 IPC 请求后再次 HLT park，控制权返回 host。
|
|||
|
|
*
|
|||
|
|
* 控制流与 linux_launch() 的 vmlaunch 对称：
|
|||
|
|
* - 保存 host RSP 和返回 RIP
|
|||
|
|
* - 执行 vmresume（成功则进入 guest，不返回）
|
|||
|
|
* - guest HLT → VM-Exit → handle_hlt park → g_guest_terminated=1
|
|||
|
|
* - vmexit_asm.S 恢复 host RSP，jmp 到返回 RIP
|
|||
|
|
* - linux_resume() 继续执行，返回 0
|
|||
|
|
*/
|
|||
|
|
|
|||
|
|
#include <utsm/linux_resume.h>
|
|||
|
|
#include <utsm/vmx.h>
|
|||
|
|
#include <utsm/vmm.h>
|
|||
|
|
#include <utsm/log.h>
|
|||
|
|
#include <utsm/types.h>
|
|||
|
|
|
|||
|
|
int linux_is_parked(void) {
|
|||
|
|
return g_guest_parked ? 1 : 0;
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
int linux_resume(void) {
|
|||
|
|
if (!g_guest_parked) {
|
|||
|
|
log_warn("[LINUX] resume: guest not parked");
|
|||
|
|
return -1;
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
/* 设置 active 标志：handle_hlt 检查此标志决定 park（而非 terminate） */
|
|||
|
|
g_linux_guest_active = 1;
|
|||
|
|
g_guest_terminated = 0;
|
|||
|
|
g_guest_parked = 0;
|
|||
|
|
|
|||
|
|
/* vmresume 控制流（与 linux_launch 的 vmlaunch 对称）：
|
|||
|
|
* - 失败：执行下一条指令，failed=1
|
|||
|
|
* - 成功：进入 guest，不返回。VM-Exit 后跳到 vmx_vm_exit_handler。
|
|||
|
|
* - guest park 时，handler 恢复 saved_rsp 并 jmp 到 post_resume 标签。 */
|
|||
|
|
int failed;
|
|||
|
|
__asm__ volatile(
|
|||
|
|
"movq %%rsp, g_saved_host_rsp(%%rip)\n\t" /* 保存当前 RSP */
|
|||
|
|
"leaq 1f(%%rip), %%rax\n\t" /* 取 post_resume 标签地址 */
|
|||
|
|
"movq %%rax, g_saved_return_rip(%%rip)\n\t" /* 保存返回 RIP */
|
|||
|
|
"vmresume\n\t" /* 唤醒 guest */
|
|||
|
|
/* ---- 失败路径 ---- */
|
|||
|
|
"movl $1, %0\n\t"
|
|||
|
|
"jmp 2f\n\t"
|
|||
|
|
/* ---- post_resume: park 路径 jmp 到这里 ---- */
|
|||
|
|
"1:\n\t"
|
|||
|
|
"movl $0, %0\n\t"
|
|||
|
|
"2:\n\t"
|
|||
|
|
: "=r"(failed)
|
|||
|
|
:: "rax", "rcx", "rdx", "rsi", "rdi",
|
|||
|
|
"r8", "r9", "r10", "r11", "memory"
|
|||
|
|
);
|
|||
|
|
|
|||
|
|
/* 回到 host 上下文 */
|
|||
|
|
g_linux_guest_active = 0;
|
|||
|
|
g_guest_parked = 1; /* guest 再次 park */
|
|||
|
|
|
|||
|
|
if (failed) {
|
|||
|
|
u64 error = vmx_vmcs_read(VMCS_VMX_INSTRUCTION_ERROR);
|
|||
|
|
log_hex64("[LINUX] vmresume failed, error=", error);
|
|||
|
|
return -2;
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
return 0;
|
|||
|
|
}
|