On Wed, Jul 24, 2013 at 6:03 PM, Jan Kiszka <[email protected]> wrote:
> On 2013-07-24 11:56, Arthur Chunqi Li wrote:
>> So what about this one. I merged all the exit reason to "ret" and
>> remove the flag detection after vmlaunch/vmresume (because I think
>> this detection is useless). Currently we support only one guest, so
>> variant "launched" is located in vmx_run(). If we want to support
>> multiple guest, we could move it to some structures (e.g.
>> environment_ctxt). Now I just put it here.
>>
>> static int vmx_run()
>> {
>> u32 ret = 0;
>> bool launched = 0;
>>
>> asm volatile(
>> "mov %%rsp, %%rsi\n\t"
>> "mov %2, %%edi\n\t"
>> "call vmcs_write\n\t"
>>
>> "0: "
>> LOAD_GPR_C
>> "cmp $0, %1\n\t"
>> "jne 1f\n\t"
>> "vmlaunch\n\t"
>> SAVE_GPR_C
>> /* vmlaunch error, return VMX_TEST_LAUNCH_ERR */
>> "mov %3, %0\n\t"
>> "jmp 2f\n\t"
>> "1: "
>> "vmresume\n\t"
>> SAVE_GPR_C
>> /* vmresume error, return VMX_TEST_RESUME_ERR */
>> "mov %4, %0\n\t"
>> "jmp 2f\n\t"
>
> Where do you store the flags now? You may want to differentiate / test
> if ZF of CF is set.
I store the flags as a global variant. You mean I need to detect ZF/CF
after vmlaunch/vmresume?
Arthur
>
> Jan
>
>> "vmx_return:\n\t"
>> SAVE_GPR_C
>> "call exit_handler\n\t"
>> /* set launched = 1 */
>> "mov $0x1, %1\n\t"
>> "cmp %5, %%eax\n\t"
>> "je 0b\n\t"
>> "mov %%eax, %0\n\t"
>> "2: "
>> : "=r"(ret), "=r"(launched)
>> : "i"(HOST_RSP), "i"(VMX_TEST_LAUNCH_ERR),
>> "i"(VMX_TEST_RESUME_ERR), "i"(VMX_TEST_RESUME)
>> : "rax", "rbx", "rdi", "rsi",
>> "r8", "r9", "r10", "r11", "r12", "r13", "r14", "r15",
>> "memory", "cc"
>> );
>> switch (ret) {
>> case VMX_TEST_VMEXIT:
>> return 0;
>> case VMX_TEST_LAUNCH_ERR:
>> printf("%s : vmlaunch failed.\n", __func__);
>> break;
>> case VMX_TEST_RESUME_ERR:
>> printf("%s : vmresume failed.\n", __func__);
>> break;
>> default:
>> printf("%s : unhandled ret from exit_handler, ret=%d.\n",
>> __func__, ret);
>> break;
>> }
>> return 1;
>> }
>>
>
>
--
Arthur Chunqi Li
Department of Computer Science
School of EECS
Peking University
Beijing, China
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