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Message-ID: <YXXNa4FcvbGfCrxr@zn.tnic> Date: Sun, 24 Oct 2021 23:17:31 +0200 From: Borislav Petkov <bp@...en8.de> To: "Chang S. Bae" <chang.seok.bae@...el.com> Cc: linux-kernel@...r.kernel.org, x86@...nel.org, tglx@...utronix.de, dave.hansen@...ux.intel.com, arjan@...ux.intel.com, ravi.v.shankar@...el.com Subject: Re: [PATCH 06/23] x86/arch_prctl: Add controls for dynamic XSTATE components On Thu, Oct 21, 2021 at 03:55:10PM -0700, Chang S. Bae wrote: > +/** > + * fpu_xstate_prctl - xstate permission operations > + * @tsk: Redundant pointer to current > + * @option: A subfunction of arch_prctl() > + * @arg2: option argument > + * Return: 0 if successful; otherwise, an error code > + * > + * Option arguments: > + * > + * ARCH_GET_XCOMP_SUPP: Pointer to user space u64 to store the info > + * ARCH_GET_XCOMP_PERM: Pointer to user space u64 to store the info > + * ARCH_REQ_XCOMP_PERM: Facility number requested > + * > + * For facilities which require more than one XSTATE component, the request > + * must be the highest state component number related to that facility, > + * e.g. for AMX which requires XFEATURE_XTILE_CFG(17) and > + * XFEATURE_XTILE_DATA(18) this would be XFEATURE_XTILE_DATA(18). > + */ Can I pls get this new set of prctl()s documented properly ontop of this patchset? I guess Documentation/x86/xstate.rst or so. Thx. -- Regards/Gruss, Boris. https://people.kernel.org/tglx/notes-about-netiquette
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