2016-11-27 20:19-0800, Kyle Huey:
> This test checks that single stepping through CPUID and RDMSR works.
> Both instructions trigger VM exits and are emulated by the hypervisor.
>
> Signed-off-by: Kyle Huey <khuey@xxxxxxxxxxxx>
> ---
> diff --git a/x86/debug.c b/x86/debug.c
> @@ -107,16 +107,47 @@ hw_bp2:
> "popf\n\t"
> : "=g" (start) : : "rax");
> report("single step",
> n == 3 &&
> bp_addr[0] == start+1+6 && dr6[0] == 0xffff4ff0 &&
> bp_addr[1] == start+1+6+1 && dr6[1] == 0xffff4ff0 &&
> bp_addr[2] == start+1+6+1+1 && dr6[2] == 0xffff4ff0);
>
> + /*
> + * cpuid and rdmsr (among others) trigger VM exits and are then
> + * emulated. Test that single stepping works on emulated instructions.
> + */
> + n = 0;
> + set_dr6(0);
> + asm volatile(
> + "pushf\n\t"
> + "pop %%rax\n\t"
> + "or $(1<<8),%%rax\n\t"
> + "push %%rax\n\t"
> + "lea (%%rip),%0\n\t"
> + "popf\n\t"
> + "and $~(1<<8),%%rax\n\t"
> + "push %%rax\n\t"
> + "xor %%rax,%%rax\n\t"
> + "cpuid\n\t"
> + "movl $0x1a0,%%ecx\n\t"
> + "rdmsr\n\t"
> + "popf\n\t"
> + : "=g" (start) : : "rax", "ebx", "ecx", "edx");
> + report("single step emulated instructions",
> + n == 7 &&
> + bp_addr[0] == start+1+6 && dr6[0] == 0xffff4ff0 &&
> + bp_addr[1] == start+1+6+1 && dr6[1] == 0xffff4ff0 &&
> + bp_addr[2] == start+1+6+1+3 && dr6[2] == 0xffff4ff0 &&
> + bp_addr[3] == start+1+6+1+3+2 && dr6[3] == 0xffff4ff0 &&
> + bp_addr[4] == start+1+6+1+3+2+5 && dr6[4] == 0xffff4ff0 &&
> + bp_addr[5] == start+1+6+1+3+2+5+2 && dr6[4] == 0xffff4ff0 &&
> + bp_addr[6] == start+1+6+1+3+2+5+2+1 && dr6[4] == 0xffff4ff0);
You probably wanted to check dr6[5] and dr6[6] too, I will fix that
while applying.
Thanks.
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