On 26/11/2014 14:48, Nadav Amit wrote:
> Previously KVM ignored the mod field of MOVBE instruction, so MOVBE from
> register to register succeeds, although it should fail (cause a #UD
> exception).
> This test check that a #UD is indeed delivered upon such MOVBE.
>
> The test would not work if MOVBE is unsupported.
>
> Signed-off-by: Nadav Amit <na...@cs.technion.ac.il>
> ---
> x86/emulator.c | 22 ++++++++++++++++++++++
> 1 file changed, 22 insertions(+)
>
> diff --git a/x86/emulator.c b/x86/emulator.c
> index 5aa4dbf..709978b 100644
> --- a/x86/emulator.c
> +++ b/x86/emulator.c
> @@ -1051,6 +1051,27 @@ static void test_simplealu(u32 *mem)
> report("test", *mem == 0x8400);
> }
>
> +static void illegal_movbe_handler(struct ex_regs *regs)
> +{
> + extern char bad_movbe_cont;
> +
> + ++exceptions;
> + regs->rip = (ulong)&bad_movbe_cont;
> +}
> +
> +static void test_illegal_movbe(void)
> +{
> + if (!(cpuid(1).c & (1 << 22)))
> + printf("SKIP: illegal movbe\n");
> +
> + exceptions = 0;
> + handle_exception(UD_VECTOR, illegal_movbe_handler);
> + asm volatile(".byte 0x0f; .byte 0x38; .byte 0xf0; .byte 0xc0;\n\t"
> + " bad_movbe_cont:" : : : "rax");
> + report("illegal movbe", exceptions == 1);
> + handle_exception(UD_VECTOR, 0);
> +}
> +
> int main()
> {
> void *mem;
> @@ -1119,6 +1140,7 @@ int main()
> test_string_io_mmio(mem);
>
> test_jmp_noncanonical(mem);
> + test_illegal_movbe();
>
> return report_summary();
> }
>
Reviewed-by: Paolo Bonzini <pbonz...@redhat.com>
Thanks,
Paolo
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