And what about this version:
static int vmx_run()
{
u32 ret = 0;
asm volatile(
"mov %%rsp, %%rsi\n\t"
"mov %2, %%edi\n\t"
"call vmcs_write\n\t"
"0: "
LOAD_GPR_C
"cmpl $0, %1\n\t"
"jne 1f\n\t"
"vmlaunch;seta %1\n\t"
/* vmlaunch error, return VMX_TEST_LAUNCH_ERR */
"movl %3, %0\n\t"
SAVE_GPR_C
"jmp 2f\n\t"
"1: "
"vmresume;seta %1\n\t"
/* vmresume error, return VMX_TEST_RESUME_ERR */
"movl %4, %0\n\t"
SAVE_GPR_C
"jmp 2f\n\t"
"vmx_return:\n\t"
SAVE_GPR_C
"call exit_handler\n\t"
/* set launched = 1 */
"movl $0x1, %1\n\t"
/* jump to resume when VMX_TEST_RESUME */
"cmp %5, %%eax\n\t"
"je 0b\n\t"
"mov %%eax, %0\n\t"
"2: "
: "=m"(ret), "=m"(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:
launched = 0;
return 0;
case VMX_TEST_LAUNCH_ERR:
printf("%s : vmlaunch failed.\n", __func__);
if (launched != 0)
printf("\tvmlaunch set flags error\n");
report("test vmlaunch", 0);
break;
case VMX_TEST_RESUME_ERR:
printf("%s : vmresume failed.\n", __func__);
if (launched != 0)
printf("\tvmlaunch set flags error\n");
report("test vmresume", 0);
break;
default:
launched = 0;
printf("%s : unhandled ret from exit_handler, ret=%d.\n",
__func__, ret);
break;
}
return 1;
}
On Wed, Jul 24, 2013 at 6:24 PM, Jan Kiszka <[email protected]> wrote:
> On 2013-07-24 12:16, Arthur Chunqi Li wrote:
>> 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?
>
> Yes - if you want to check correct emulation of those instructions
> completely.
>
> Jan
>
>
--
Arthur Chunqi Li
Department of Computer Science
School of EECS
Peking University
Beijing, China
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