On 3/13/19 5:40 AM, Paolo Bonzini wrote:
> +static bool have_cet(void)
> +{
> +#if defined CONFIG_CET
> +    uint64_t ssp;
> +    asm ("xor %0, %0; rdsspq %0\n" : "=rm" (ssp));

The xor is incompatible with a memory output.
I don't think you really wanted that in the first place.
Just use "=r".

The rest is hard to review because of ARCH_X86_CET_ALLOC_SHSTK.
I'm surprised that a prctl actually allocates memory...


r~

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