Re: [kvm-unit-tests PATCH 3/5] powerpc: check 64bit mode

[Thomas Huth <thuth@redhat.com>]

On 16.03.2016 16:13, Laurent Vivier wrote:
> Check in MSR if the SF bit is set (64bit mode is enabled)
> 
> Signed-off-by: Laurent Vivier <lvivier@redhat.com>
> ---
>  powerpc/emulator.c | 14 ++++++++++++++
>  1 file changed, 14 insertions(+)
> 
> diff --git a/powerpc/emulator.c b/powerpc/emulator.c
> index 1215c4f..b66c1d7 100644
> --- a/powerpc/emulator.c
> +++ b/powerpc/emulator.c
> @@ -32,12 +32,26 @@ static void test_illegal(void)
>  	report_prefix_pop();
>  }
>  
> +static void test_64bit(void)
> +{
> +	uint64_t msr;
> +
> +	report_prefix_push("64bit");
> +
> +	asm("mfmsr %[msr]": [msr] "=r" (msr));
> +
> +	report("detected", msr & 0x8000000000000000UL);
> +
> +	report_prefix_pop();
> +}
> +
>  int main(void)
>  {
>  	handle_exception(0x700, program_check_handler, (void *)&is_invalid);
>  
>  	report_prefix_push("emulator");
>  
> +	test_64bit();
>  	test_illegal();
>  
>  	report_prefix_pop();

Reviewed-by: Thomas Huth <thuth@redhat.com>

But I still wonder how kvm-unit-tests worked at all before the 64-bit
mode has been fixed in QEMU ... I mean kvm-unit-tests is compiled with
64-bit code, but it's still working when run in 32-bit? Something really
strange was going on here...

 Thomas