From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from casper.infradead.org (casper.infradead.org [90.155.50.34]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 79BB12500CC for ; Mon, 25 Nov 2024 18:53:48 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=90.155.50.34 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1732560833; cv=none; b=WgB0ot47db25bAtpWlq6gptwZeZZYHKNXBj0c3GPVzJR5oGl3rDN9P/Sz5NOQK6fX+NGCCvF+NJSUY1eYA30mKwfAu883Z4V3YARJKEctvSu20iPqzFv8Tx7qwj3fgrciG+whLCe4TITLaBDEhtVnpPu/8wLj+MXFRc6U4pIU4I= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1732560833; c=relaxed/simple; bh=+mX8VVdL4egdn+K0SMz8uZMew+UrKEoxKGnv2SnH9Es=; h=Message-ID:Subject:From:To:Cc:Date:In-Reply-To:References: Content-Type:MIME-Version; b=tJDZ5FbvDnBIH9HYHSApOVmP5VyWw4hTfO7f21QU1IUjZRAWWr1gi12aDijeRnq/FDnY9VzwRM7Dqi7rWaU8Cyeeui2ueSnJudVNLBAd/L405QPFTHUDoSgDuwgERv9o+O4syV72ZgAD5at7xwtbHKOi9rx/lC2vUVEQnElgw2s= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=infradead.org; spf=none smtp.mailfrom=casper.srs.infradead.org; dkim=pass (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b=PIsjbxJX; arc=none smtp.client-ip=90.155.50.34 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=infradead.org Authentication-Results: smtp.subspace.kernel.org; spf=none smtp.mailfrom=casper.srs.infradead.org Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b="PIsjbxJX" DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=casper.20170209; h=MIME-Version:Content-Type:References: In-Reply-To:Date:Cc:To:From:Subject:Message-ID:Sender:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description; bh=wzYEeT2AncX1CBZTU54QMiHHXfu5VATW8rq1tmuzgAQ=; b=PIsjbxJXyA9vv5/7nn6aOHJ/Fu GfkLF8qzWmqdONksaOdi/xckRDcHckq9+cZCmURGQ2ipB49XoEzz5jRXCFWxj/wBUGTvSAGwewzXX T3YHjaQ9EflPkUVliBiWmpqbn5xd2ooeB51v8ft9D7+/pg03V7x5YK3+LOKGBL4CMU+Z7HM5N38SK 5f68IbvjHWlaRE/IVbCnBa4Rm9r3nUb6v/WOoJbGFD6cCwF/TW2XFzA9qwZaUjAe6CN1XIerJOk21 BNcNzIGGdydFG/6N2IMq0++3oAuKFKCtGHLxFnkKkViBpJvdl7IEoPtx9HnlDYVCz1WmVsB8TP7jN qIKT8qNA==; Received: from [54.239.6.187] (helo=edge-m3-r1-122.e-iad51.amazon.com) by casper.infradead.org with esmtpsa (Exim 4.98 #2 (Red Hat Linux)) id 1tFeDA-0000000CJTD-1b8c; Mon, 25 Nov 2024 18:53:29 +0000 Message-ID: <5d385e4c06ebd218cfdc20ef4f208ee4abcfa252.camel@infradead.org> Subject: Re: [RFC PATCH] x86/mm: Disable PTI for kernel_ident_mapping_init() From: David Woodhouse To: Dave Hansen , kexec@lists.infradead.org, =?ISO-8859-1?Q?Sch=F6nherr=2C?= "Jan H." , Rik van Riel Cc: Thomas Gleixner , Ingo Molnar , Borislav Petkov , Dave Hansen , x86@kernel.org, "H. Peter Anvin" , "Kirill A. Shutemov" , Kai Huang , Nikolay Borisov , linux-kernel@vger.kernel.org, Simon Horman , Dave Young , Peter Zijlstra , jpoimboe@kernel.org, bsz@amazon.de Date: Mon, 25 Nov 2024 18:53:28 +0000 In-Reply-To: <88a87314-45ad-47f7-a93a-a9a53d7e8745@intel.com> References: <20241125100815.2512-1-dwmw2@infradead.org> <20241125100815.2512-2-dwmw2@infradead.org> <8b7cd35ab5fec39b80eda8d5907b641af14c3272.camel@infradead.org> <7f75150e9d5d358c8fdc38b591f99a252071fba0.camel@infradead.org> <7e7cb9b21f17b345d8539962093d0c030cca3e34.camel@infradead.org> <88a87314-45ad-47f7-a93a-a9a53d7e8745@intel.com> Content-Type: multipart/signed; micalg="sha-256"; protocol="application/pkcs7-signature"; boundary="=-N7ij4j71YiVwR7ZDHrXW" User-Agent: Evolution 3.52.3-0ubuntu1 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-SRS-Rewrite: SMTP reverse-path rewritten from by casper.infradead.org. See http://www.infradead.org/rpr.html --=-N7ij4j71YiVwR7ZDHrXW Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Mon, 2024-11-25 at 10:31 -0800, Dave Hansen wrote: > On 11/25/24 09:05, David Woodhouse wrote: > > Not sure I like this very much, but it works, and mirrors what > > arch/x86/boot/compressed/ident_map_64.c already does. >=20 > I don't like it much, either. >=20 > arch/x86/boot/compressed/ is already on the road to sharing no code with > the core kernel and it's full of horrors. It should be an example of > what *not* to do. ;) >=20 > I think we have a lot of software-available space in the page table > pointer entries. What would folks think if we set a special bit in those > p4d entries that said: >=20 > "I don't need to be propagated to > the user portion of the page tables." >=20 > It would obviously get set in this code that you're trying to fix. It > might _also_ be able to be set in in "_USR", like here: >=20 > #define _KERNPG_TABLE_NOENC=C2=A0 (__PP|__RW|=C2=A0=C2=A0 0|___A|=C2=A0= =C2=A0 0|___D|=C2=A0=C2=A0 0|=C2=A0=C2=A0 0) > #define _PAGE_TABLE_NOENC=C2=A0=C2=A0=C2=A0 (__PP|__RW|_USR|___A|=C2=A0= =C2=A0 0|___D|=C2=A0=C2=A0 0|=C2=A0=C2=A0 0) >=20 > like: >=20 > #define _USR _PAGE_USER|_PAGE_SW_WHATEVER In fact, do we even need a separate bit? 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