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X-CSE-ConnectionGUID: UOrRB7EgRxWF7/UTbb+11w== X-CSE-MsgGUID: EXJIFnryQIum7XZgYQaCOA== X-IronPort-AV: E=McAfee;i="6700,10204,11362"; a="45568610" X-IronPort-AV: E=Sophos;i="6.13,330,1732608000"; d="scan'208";a="45568610" Received: from fmviesa006.fm.intel.com ([10.60.135.146]) by orvoesa107.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 03 Mar 2025 10:41:29 -0800 X-CSE-ConnectionGUID: G49fbFoBSMS+DXxwoTmwfA== X-CSE-MsgGUID: 3zitSSg0QuOhW4I9KyQWVg== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.13,330,1732608000"; d="scan'208";a="117916427" Received: from msatwood-mobl.amr.corp.intel.com (HELO [10.125.109.13]) ([10.125.109.13]) by fmviesa006-auth.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 03 Mar 2025 10:41:27 -0800 Content-Type: multipart/mixed; boundary="------------uN8jXvp4vvy0mjcYW4E3DSkl" Message-ID: <30c721e0-338d-4172-989c-5226d584bcbc@intel.com> Date: Mon, 3 Mar 2025 10:41:44 -0800 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v14 03/13] x86/mm: add INVLPGB support code To: Borislav Petkov , Rik van Riel Cc: x86@kernel.org, linux-kernel@vger.kernel.org, peterz@infradead.org, dave.hansen@linux.intel.com, zhengqi.arch@bytedance.com, nadav.amit@gmail.com, thomas.lendacky@amd.com, kernel-team@meta.com, linux-mm@kvack.org, akpm@linux-foundation.org, jackmanb@google.com, jannh@google.com, mhklinux@outlook.com, andrew.cooper3@citrix.com, Manali.Shukla@amd.com, mingo@kernel.org References: <20250226030129.530345-1-riel@surriel.com> <20250226030129.530345-4-riel@surriel.com> <20250228194734.GGZ8IS1iFVpPzmEyYl@fat_crate.local> From: Dave Hansen Content-Language: en-US Autocrypt: addr=dave.hansen@intel.com; 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charset=UTF-8 Content-Transfer-Encoding: 7bit On 2/28/25 11:47, Borislav Petkov wrote: > @@ -157,11 +140,14 @@ index 77f52bc1578a..91c9a4da3ace 100644 > +/* Flush all mappings for all PCIDs except globals. */ > +static inline void invlpgb_flush_all_nonglobals(void) > +{ > ++ /* > ++ * @addr=0 means both rax[1] (valid PCID) and rax[2] (valid ASID) are clear > ++ * so flush *any* PCID and ASID. > ++ */ > + __invlpgb(0, 0, 0, 1, 0, 0); > + __tlbsync(); > +} I had a bit of an allergic reaction to all of the magic numbers. Could we do something like the attached where we give a _few_ of the magic numbers some symbolic names? For instance, instead of passing around a bool for pmd_stride, this uses an enum. It also explicitly separates things that are setting pmd_stride=0 but are really saying "this is a 4k stride" from things that set pmd_stride=0 but are for operations that don't _have_ a stride. --------------uN8jXvp4vvy0mjcYW4E3DSkl Content-Type: text/x-patch; charset=UTF-8; name="supportcode.patch" Content-Disposition: attachment; filename="supportcode.patch" Content-Transfer-Encoding: base64 LS0tIGM4MzQ0OTY4MDE3MDE3MGY1NWEwYWIyZWI0OThiOTJjZTk3YzA2MjQucGF0Y2gJMjAy NS0wMy0wMyAxMDozNTo0Ny40MjIyNzczMzUgLTA4MDAKKysrIDExY2U0YjIyNjQzYmUucGF0 Y2gJMjAyNS0wMy0wMyAxMDozODowNS42OTI1MDk5OTMgLTA4MDAKQEAgLTEsOCArMSw4IEBA Ci1jb21taXQgYzgzNDQ5NjgwMTcwMTcwZjU1YTBhYjJlYjQ5OGI5MmNlOTdjMDYyNAorY29t bWl0IDExY2U0YjIyNjQzYmU1NGIyYzcwY2Y2YjQ3NDNlNmI3M2I0NjE4MTQKIEF1dGhvcjog UmlrIHZhbiBSaWVsIDxyaWVsQHN1cnJpZWwuY29tPgogRGF0ZTogICBGcmkgRmViIDI4IDIw OjMyOjMwIDIwMjUgKzAxMDAKIAotICAgICB4ODYvbW06IEFkZCBJTlZMUEdCIHN1cHBvcnQg Y29kZQorICAgIHg4Ni9tbTogQWRkIElOVkxQR0Igc3VwcG9ydCBjb2RlCiAgICAgCiAgICAg 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