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From: | Richard Henderson |
Subject: | Re: [Qemu-devel] [PATCH 7/7] coroutine-x86: add CET shadow stack support |
Date: | Wed, 13 Mar 2019 17:04:49 -0700 |
User-agent: | Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.4.0 |
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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