From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from smtp4.osuosl.org (smtp4.osuosl.org [140.211.166.137]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 44AFAC433F5 for ; Tue, 23 Nov 2021 09:52:13 +0000 (UTC) Received: from localhost (localhost [127.0.0.1]) by smtp4.osuosl.org (Postfix) with ESMTP id D7EE540357; Tue, 23 Nov 2021 09:52:12 +0000 (UTC) X-Virus-Scanned: amavisd-new at osuosl.org Received: from smtp4.osuosl.org ([127.0.0.1]) by localhost (smtp4.osuosl.org [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id jxOYvsYRtPuw; Tue, 23 Nov 2021 09:52:12 +0000 (UTC) Received: from lists.linuxfoundation.org (lf-lists.osuosl.org [IPv6:2605:bc80:3010:104::8cd3:938]) by smtp4.osuosl.org (Postfix) with ESMTPS id 67FD5402B9; Tue, 23 Nov 2021 09:52:11 +0000 (UTC) Received: from lf-lists.osuosl.org (localhost [127.0.0.1]) by lists.linuxfoundation.org (Postfix) with ESMTP id 1BE9BC002E; Tue, 23 Nov 2021 09:52:11 +0000 (UTC) Received: from smtp2.osuosl.org (smtp2.osuosl.org [140.211.166.133]) by lists.linuxfoundation.org (Postfix) with ESMTP id B3DC7C0012 for ; Tue, 23 Nov 2021 09:52:09 +0000 (UTC) Received: from localhost (localhost [127.0.0.1]) by smtp2.osuosl.org (Postfix) with ESMTP id 9A5EF40197 for ; Tue, 23 Nov 2021 09:52:09 +0000 (UTC) X-Virus-Scanned: amavisd-new at osuosl.org Authentication-Results: smtp2.osuosl.org (amavisd-new); dkim=pass (1024-bit key) header.d=suse.com Received: from smtp2.osuosl.org ([127.0.0.1]) by localhost (smtp2.osuosl.org [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 07LMj6B03gq0 for ; Tue, 23 Nov 2021 09:52:08 +0000 (UTC) X-Greylist: domain auto-whitelisted by SQLgrey-1.8.0 Received: from smtp-out1.suse.de (smtp-out1.suse.de [195.135.220.28]) by smtp2.osuosl.org (Postfix) with ESMTPS id B323640019 for ; Tue, 23 Nov 2021 09:52:08 +0000 (UTC) Received: from imap2.suse-dmz.suse.de (imap2.suse-dmz.suse.de [192.168.254.74]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature ECDSA (P-521) server-digest SHA512) (No client certificate requested) by smtp-out1.suse.de (Postfix) with ESMTPS id BF49C2171F; Tue, 23 Nov 2021 09:52:05 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=suse.com; s=susede1; t=1637661125; h=from:from:reply-to:date:date:message-id:message-id:to:to:cc:cc: mime-version:mime-version:content-type:content-type: in-reply-to:in-reply-to:references:references; bh=ajOZHsKp7ZQkVUpCLoKZo/kkMAi5Cu53dgZV5A7a6to=; b=qC2kKbqGgqbDe9Rhp66PjMM8guhttStCcfNu5XIpe7UdHE//SSTEJ4kUmVfrR7At7gKKWE 7loxzVt5IadV1zXJPmNFlQcPaKwhPxcuJo0kJ5grYdn56lJ6jx+qq9ddQDuG9fM6RdXzxp yySGZg+L4+UensBEtWdLhChM/axBnDU= Received: from imap2.suse-dmz.suse.de (imap2.suse-dmz.suse.de [192.168.254.74]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature ECDSA (P-521) server-digest SHA512) (No client certificate requested) by imap2.suse-dmz.suse.de (Postfix) with ESMTPS id 98F4B13DBE; Tue, 23 Nov 2021 09:52:05 +0000 (UTC) Received: from dovecot-director2.suse.de ([192.168.254.65]) by imap2.suse-dmz.suse.de with ESMTPSA id A+8OJMW5nGEUIgAAMHmgww (envelope-from ); Tue, 23 Nov 2021 09:52:05 +0000 Subject: Re: [PATCH] x86/paravirt: use %rip-relative addressing in hook calls To: Jan Beulich , Thomas Gleixner References: <1ef292aa-9107-4e79-9e60-75887bc04dd3@suse.com> Message-ID: <764eb4c1-0839-b7da-1c7f-837380fa39fd@suse.com> Date: Tue, 23 Nov 2021 10:52:05 +0100 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.12.0 MIME-Version: 1.0 In-Reply-To: <1ef292aa-9107-4e79-9e60-75887bc04dd3@suse.com> Cc: "VMware, Inc." , Linux Virtualization X-BeenThere: virtualization@lists.linux-foundation.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: Linux virtualization List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , From: Juergen Gross via Virtualization Reply-To: Juergen Gross Content-Type: multipart/mixed; boundary="===============6858645738247222272==" Errors-To: virtualization-bounces@lists.linux-foundation.org Sender: "Virtualization" This is an OpenPGP/MIME signed message (RFC 4880 and 3156) --===============6858645738247222272== Content-Type: multipart/signed; micalg=pgp-sha256; protocol="application/pgp-signature"; boundary="BIDBiEAw5kGt42EalW9E6rbMZ9WVUvDaM" This is an OpenPGP/MIME signed message (RFC 4880 and 3156) --BIDBiEAw5kGt42EalW9E6rbMZ9WVUvDaM Content-Type: multipart/mixed; boundary="VCZwzJmkzXEcoQD7Yz1ualSyyA2nj2Ayx"; protected-headers="v1" From: Juergen Gross To: Jan Beulich , Thomas Gleixner Cc: Linux Virtualization , Deep Shah , "VMware, Inc." Message-ID: <764eb4c1-0839-b7da-1c7f-837380fa39fd@suse.com> Subject: Re: [PATCH] x86/paravirt: use %rip-relative addressing in hook calls References: <1ef292aa-9107-4e79-9e60-75887bc04dd3@suse.com> In-Reply-To: <1ef292aa-9107-4e79-9e60-75887bc04dd3@suse.com> --VCZwzJmkzXEcoQD7Yz1ualSyyA2nj2Ayx Content-Type: multipart/mixed; boundary="------------6E2EE9EB86E99F5290F1B256" Content-Language: en-US This is a multi-part message in MIME format. --------------6E2EE9EB86E99F5290F1B256 Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: quoted-printable On 23.11.21 10:29, Jan Beulich wrote: > On 05.10.2021 09:43, Juergen Gross wrote: >> On 30.09.21 14:40, Jan Beulich via Virtualization wrote: >>> While using a plain (constant) address works, its use needlessly invo= kes >>> a SIB addressing mode, making every call site one byte larger than >>> necessary. Instead of using an "i" constraint with address-of operato= r >>> and a 'c' operand modifier, simply use an ordinary "m" constraint, wh= ich >>> the 64-bit compiler will translate to %rip-relative addressing. This = way >>> we also tell the compiler the truth about operand usage - the memory >>> location gets actually read, after all. >>> >>> 32-bit code generation is unaffected by the change. >>> >>> Signed-off-by: Jan Beulich >> >> Reviewed-by: Juergen Gross >=20 > Thanks. I notice this wasn't part of your 5.16-rc1 pull request, nor > did it make it into Linus'es tree via any other route. May I ask what > the plans here are? I CC-ed you on the related mail I sent to the x86 maintainers: "Re: Which tree for paravirt related patches?" on Nov 4th, and Thomas Gleixner promised to look at your patch. Adding him to this response again in order to remind him. 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