90 lines
2.7 KiB
C
90 lines
2.7 KiB
C
/* linux_resume.c — Linux guest park-and-resume 唤醒实现。
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*
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* linux_resume() 通过 vmresume 唤醒已 HLT park 的 Linux guest。
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* guest daemon 处理 IPC 请求后再次 HLT park，控制权返回 host。
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*
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* 控制流与 linux_launch() 的 vmlaunch 对称：
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* - 保存 host RSP 和返回 RIP
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* - 执行 vmresume（成功则进入 guest，不返回）
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* - guest HLT → VM-Exit → handle_hlt park → g_guest_terminated=1
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* - vmexit_asm.S 恢复 host RSP，jmp 到返回 RIP
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* - linux_resume() 继续执行，返回 0
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*/
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#include <utsm/linux_resume.h>
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#include <utsm/linux_xsave.h>
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#include <utsm/vmx.h>
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#include <utsm/vmm.h>
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#include <utsm/log.h>
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#include <utsm/types.h>
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/* Must be RIP-relative, not a stack slot: vmexit_asm restores guest GPRs
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* (including RBP) before jumping here, so "=m"(local) can #PF at CR2≈0. */
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int g_linux_resume_failed;
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int linux_is_parked(void) {
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return g_guest_parked ? 1 : 0;
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}
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int linux_resume(void) {
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if (!g_guest_parked) {
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log_warn("[LINUX] resume: guest not parked");
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return -1;
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}
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/* 设置 active 标志：handle_hlt 检查此标志决定 park（而非 terminate） */
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g_linux_guest_active = 1;
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g_guest_terminated = 0;
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g_guest_parked = 0;
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vmx_linux_timeslice_reset();
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linux_xsave_save_host();
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linux_xsave_load_guest();
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vmx_linux_prepare_entry();
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/* vmresume 控制流（与 linux_launch 的 vmlaunch 对称）。
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* clobber 全 GPR：从 park 跳回时 CPU 上是 guest 寄存器。 */
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g_linux_resume_failed = 1;
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__asm__ volatile(
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"pushq %%rbx\n\t"
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"pushq %%rbp\n\t"
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"pushq %%r12\n\t"
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"pushq %%r13\n\t"
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"pushq %%r14\n\t"
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"pushq %%r15\n\t"
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"movq %%rsp, g_saved_host_rsp(%%rip)\n\t"
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"leaq 1f(%%rip), %%rax\n\t"
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"movq %%rax, g_saved_return_rip(%%rip)\n\t"
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"vmresume\n\t"
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"movl $1, g_linux_resume_failed(%%rip)\n\t"
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"jmp 2f\n\t"
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"1:\n\t"
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"movl $0, g_linux_resume_failed(%%rip)\n\t"
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"2:\n\t"
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"popq %%r15\n\t"
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"popq %%r14\n\t"
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"popq %%r13\n\t"
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"popq %%r12\n\t"
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"popq %%rbp\n\t"
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"popq %%rbx\n\t"
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:
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:
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: "rax", "rcx", "rdx", "rsi", "rdi",
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"r8", "r9", "r10", "r11", "cc", "memory"
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);
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/* 回到 host 上下文 */
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g_linux_guest_active = 0;
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g_guest_parked = 1;
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vmx_linux_timeslice_disarm();
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linux_xsave_save_guest();
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linux_xsave_load_host();
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if (g_linux_resume_failed) {
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u64 error = vmx_vmcs_read(VMCS_VMX_INSTRUCTION_ERROR);
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log_hex64("[LINUX] vmresume failed, error=", error);
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return -2;
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}
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return 0;
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}
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