From nobody Sat Nov 30 01:54:21 2024 Delivered-To: importer@patchew.org Received-SPF: pass (zohomail.com: domain of lists.xenproject.org designates 192.237.175.120 as permitted sender) client-ip=192.237.175.120; envelope-from=xen-devel-bounces@lists.xenproject.org; helo=lists.xenproject.org; Authentication-Results: mx.zohomail.com; dkim=pass; spf=pass (zohomail.com: domain of lists.xenproject.org designates 192.237.175.120 as permitted sender) smtp.mailfrom=xen-devel-bounces@lists.xenproject.org; dmarc=pass(p=quarantine dis=none) header.from=suse.com ARC-Seal: i=1; a=rsa-sha256; t=1732544959; cv=none; d=zohomail.com; s=zohoarc; b=lqpW6M/cxuMY9clDrI67GAEWW8KUlVtL3hIiq5am0P3JDNJoG3tcgNW/I35S2G+GQbknv8PbQeHNwteo8qQjOeSHu1LtZIvGxDGxlaPGrSeEWGrkkaotUfRUu1vnrz35wGkzxNDkoydZUE2wZft25KK9KYXLgPYFhZcFW6rbaAg= ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=zohomail.com; s=zohoarc; t=1732544959; h=Content-Type:Content-Transfer-Encoding:Cc:Cc:Date:Date:From:From:In-Reply-To:List-Subscribe:List-Post:List-Id:List-Help:List-Unsubscribe:MIME-Version:Message-ID:References:Sender:Subject:Subject:To:To:Message-Id:Reply-To; bh=Ik+kdwvsn5sI13Sqvs0LoMAnkH/bBuVd5/sAq0CDmGU=; b=QSm6Tv2t4/Iu+XxQ0xbnpHfMEhVHmwrkav6bX9aultZNj9Njo/0CRDnf+wMene20+rHigAoxZVpqoQYdRo85GPRThVhoDqryVvBkzZ/kaUCgxxqkPjPypkWk09qY9mKsICRyGrv8y6YbeX2xwKKDUPH50pbfwJGOtSH8rddb+44= ARC-Authentication-Results: i=1; mx.zohomail.com; dkim=pass; spf=pass (zohomail.com: domain of lists.xenproject.org designates 192.237.175.120 as permitted sender) smtp.mailfrom=xen-devel-bounces@lists.xenproject.org; dmarc=pass header.from= (p=quarantine dis=none) Return-Path: Received: from lists.xenproject.org (lists.xenproject.org [192.237.175.120]) by mx.zohomail.com with SMTPS id 1732544959675151.2124117645052; Mon, 25 Nov 2024 06:29:19 -0800 (PST) Received: from list by lists.xenproject.org with outflank-mailman.842642.1258323 (Exim 4.92) (envelope-from ) id 1tFa5M-0003Ru-8T; Mon, 25 Nov 2024 14:29:08 +0000 Received: by outflank-mailman (output) from mailman id 842642.1258323; Mon, 25 Nov 2024 14:29:08 +0000 Received: from localhost ([127.0.0.1] helo=lists.xenproject.org) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1tFa5M-0003Rn-4Y; Mon, 25 Nov 2024 14:29:08 +0000 Received: by outflank-mailman (input) for mailman id 842642; Mon, 25 Nov 2024 14:29:06 +0000 Received: from se1-gles-sth1-in.inumbo.com ([159.253.27.254] helo=se1-gles-sth1.inumbo.com) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1tFa5K-0002BZ-8Y for xen-devel@lists.xenproject.org; Mon, 25 Nov 2024 14:29:06 +0000 Received: from mail-wm1-x32c.google.com (mail-wm1-x32c.google.com [2a00:1450:4864:20::32c]) by se1-gles-sth1.inumbo.com (Halon) with ESMTPS id 9ecc9735-ab39-11ef-a0cd-8be0dac302b0; Mon, 25 Nov 2024 15:29:03 +0100 (CET) Received: by mail-wm1-x32c.google.com with SMTP id 5b1f17b1804b1-434a1fe2b43so3893185e9.2 for ; Mon, 25 Nov 2024 06:29:03 -0800 (PST) Received: from [10.156.60.236] (ip-037-024-206-209.um08.pools.vodafone-ip.de. [37.24.206.209]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-433b463abbfsm200763465e9.32.2024.11.25.06.29.01 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Mon, 25 Nov 2024 06:29:01 -0800 (PST) X-Outflank-Mailman: Message body and most headers restored to incoming version X-BeenThere: xen-devel@lists.xenproject.org List-Id: Xen developer discussion List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Errors-To: xen-devel-bounces@lists.xenproject.org Precedence: list Sender: "Xen-devel" X-Inumbo-ID: 9ecc9735-ab39-11ef-a0cd-8be0dac302b0 X-Custom-Connection: eyJyZW1vdGVpcCI6IjJhMDA6MTQ1MDo0ODY0OjIwOjozMmMiLCJoZWxvIjoibWFpbC13bTEteDMyYy5nb29nbGUuY29tIn0= X-Custom-Transaction: eyJpZCI6IjllY2M5NzM1LWFiMzktMTFlZi1hMGNkLThiZTBkYWMzMDJiMCIsInRzIjoxNzMyNTQ0OTQzLjk0MTA1Miwic2VuZGVyIjoiamJldWxpY2hAc3VzZS5jb20iLCJyZWNpcGllbnQiOiJ4ZW4tZGV2ZWxAbGlzdHMueGVucHJvamVjdC5vcmcifQ== DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=suse.com; s=google; t=1732544943; x=1733149743; darn=lists.xenproject.org; h=content-transfer-encoding:in-reply-to:autocrypt:content-language :references:cc:to:from:subject:user-agent:mime-version:date :message-id:from:to:cc:subject:date:message-id:reply-to; bh=Ik+kdwvsn5sI13Sqvs0LoMAnkH/bBuVd5/sAq0CDmGU=; b=Il3rTUUPchL5fOtlOteck2i3OpbcWvYwakRA9DhY1Kc0+eA8WEgCjFa4rtXp1f+Y9S unahajGuthcGZwm5mwB63aSBaPtQLfkefaqOSgmno2CWOWwYug0z7GSlPs1FetnaHtt0 jKObspLYoBjNCO5J8Jvq0VnZ5RbcEkzq8TQMk6uy2c+fryPnS5Exlr/BpSJd04NEQZWl hEC+HN/pIm8jbdx5JwSGC87vXYNoVR/VJj0CQSBi/zPFKFCusBKvVkgtzkd5kgzkG7u/ YVLQnU+DWBsGQ9xSrJDFtwsrlTjQQZ5PDxwnm07E/lYquTgapkEE0Lm+rn+yw4ZWPB9G XUpQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1732544943; x=1733149743; h=content-transfer-encoding:in-reply-to:autocrypt:content-language :references:cc:to:from:subject:user-agent:mime-version:date :message-id:x-gm-message-state:from:to:cc:subject:date:message-id :reply-to; bh=Ik+kdwvsn5sI13Sqvs0LoMAnkH/bBuVd5/sAq0CDmGU=; b=Pu5w1aAsEg21seTO5RMr//K/FvMR3XVXIerxflBG7luyTdDrpzuIVb0jCgQWITImpC yr+ltuEtvKlAb7jsWs9Bmf1hoviLnXwJrAS9Lhn93xFnheSoUzQmJHgEM21e4JWK5rFH ekl8zCoPxxI+Xqi5QvlYFLduCHIhNtyVAFKS+cUSqdmasXOhv0ACSBFURqHXuVYncHQm JU+nkoxJn6ZVjuiDPHlO7WTzhjQzyjfoa3UysBushnxwjcRvPXDrJHJJW9VkqpUbRkNY KBNIpzrf7vkaNjpwDpR15ijP9rYB3iEhYu8sW/DT7/rgAtycT/JwENrJ976fwCTn63ls LV0Q== X-Gm-Message-State: AOJu0YxZt7kQIKGhg8RDANlbDvvs9S7QjBG/vyzveZWSiqBgbNE/2x4d Lg6IZ0b3evX7HpszupXTfd0M4ZJ2ET2wtHIGFVmZpr4oS+xHpSVxoZv0VIKD0OSm5Y2Lh+HTLjk = X-Gm-Gg: ASbGncvb3uVYWAeSEtdmop8ecD229pcZYZ9t3wgcgGlDDT2DuC+vv53q+QDxiWM1REi z4RgQ33rEZgC38rJuF93yayTr3gHm5gwuydyAqy7mZScIbMPYt0Rk2qhjZbSwjB2Q6eZsxBoF5D Q2wmsBn+KK5NOkvJH4sHap30h5+gdfo2ueHrvqAClAW5LRxVsFd3dcX2TyFg6OGHGsqK62XHNGE jOVH7pSJDvHNHCIjahS0BlcrC3HpG/Cxv5ECozfKmi6WB/fN0FdJSKQJjKpj7TRhyTkB/t6RWZH 1J3ssWntmvLQRNFyO3vr/H4aM4Z8lL7whzU= X-Google-Smtp-Source: AGHT+IHUshLW1UH2BD/cE563Qw8MRdVLVfUzlOYqpiV9f+lqWs3Om2jqwXsYN5ldzFhj2qZ8FQFuJA== X-Received: by 2002:a05:600c:4447:b0:42c:e0da:f15c with SMTP id 5b1f17b1804b1-433ce495857mr101725265e9.20.1732544941872; Mon, 25 Nov 2024 06:29:01 -0800 (PST) Message-ID: <1c935aba-a185-43de-9806-6781b1a7fcf9@suse.com> Date: Mon, 25 Nov 2024 15:29:00 +0100 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: [PATCH v3 4/7] x86: control memset() and memcpy() inlining From: Jan Beulich To: "xen-devel@lists.xenproject.org" Cc: Andrew Cooper , =?UTF-8?Q?Roger_Pau_Monn=C3=A9?= References: Content-Language: en-US Autocrypt: addr=jbeulich@suse.com; keydata= xsDiBFk3nEQRBADAEaSw6zC/EJkiwGPXbWtPxl2xCdSoeepS07jW8UgcHNurfHvUzogEq5xk hu507c3BarVjyWCJOylMNR98Yd8VqD9UfmX0Hb8/BrA+Hl6/DB/eqGptrf4BSRwcZQM32aZK 7Pj2XbGWIUrZrd70x1eAP9QE3P79Y2oLrsCgbZJfEwCgvz9JjGmQqQkRiTVzlZVCJYcyGGsD /0tbFCzD2h20ahe8rC1gbb3K3qk+LpBtvjBu1RY9drYk0NymiGbJWZgab6t1jM7sk2vuf0Py O9Hf9XBmK0uE9IgMaiCpc32XV9oASz6UJebwkX+zF2jG5I1BfnO9g7KlotcA/v5ClMjgo6Gl MDY4HxoSRu3i1cqqSDtVlt+AOVBJBACrZcnHAUSuCXBPy0jOlBhxPqRWv6ND4c9PH1xjQ3NP nxJuMBS8rnNg22uyfAgmBKNLpLgAGVRMZGaGoJObGf72s6TeIqKJo/LtggAS9qAUiuKVnygo 3wjfkS9A3DRO+SpU7JqWdsveeIQyeyEJ/8PTowmSQLakF+3fote9ybzd880fSmFuIEJldWxp Y2ggPGpiZXVsaWNoQHN1c2UuY29tPsJgBBMRAgAgBQJZN5xEAhsDBgsJCAcDAgQVAggDBBYC AwECHgECF4AACgkQoDSui/t3IH4J+wCfQ5jHdEjCRHj23O/5ttg9r9OIruwAn3103WUITZee e7Sbg12UgcQ5lv7SzsFNBFk3nEQQCACCuTjCjFOUdi5Nm244F+78kLghRcin/awv+IrTcIWF hUpSs1Y91iQQ7KItirz5uwCPlwejSJDQJLIS+QtJHaXDXeV6NI0Uef1hP20+y8qydDiVkv6l IreXjTb7DvksRgJNvCkWtYnlS3mYvQ9NzS9PhyALWbXnH6sIJd2O9lKS1Mrfq+y0IXCP10eS FFGg+Av3IQeFatkJAyju0PPthyTqxSI4lZYuJVPknzgaeuJv/2NccrPvmeDg6Coe7ZIeQ8Yj t0ARxu2xytAkkLCel1Lz1WLmwLstV30g80nkgZf/wr+/BXJW/oIvRlonUkxv+IbBM3dX2OV8 AmRv1ySWPTP7AAMFB/9PQK/VtlNUJvg8GXj9ootzrteGfVZVVT4XBJkfwBcpC/XcPzldjv+3 HYudvpdNK3lLujXeA5fLOH+Z/G9WBc5pFVSMocI71I8bT8lIAzreg0WvkWg5V2WZsUMlnDL9 mpwIGFhlbM3gfDMs7MPMu8YQRFVdUvtSpaAs8OFfGQ0ia3LGZcjA6Ik2+xcqscEJzNH+qh8V m5jjp28yZgaqTaRbg3M/+MTbMpicpZuqF4rnB0AQD12/3BNWDR6bmh+EkYSMcEIpQmBM51qM EKYTQGybRCjpnKHGOxG0rfFY1085mBDZCH5Kx0cl0HVJuQKC+dV2ZY5AqjcKwAxpE75MLFkr wkkEGBECAAkFAlk3nEQCGwwACgkQoDSui/t3IH7nnwCfcJWUDUFKdCsBH/E5d+0ZnMQi+G0A nAuWpQkjM1ASeQwSHEeAWPgskBQL In-Reply-To: Content-Transfer-Encoding: quoted-printable X-ZohoMail-DKIM: pass (identity @suse.com) X-ZM-MESSAGEID: 1732544960730019100 Content-Type: text/plain; charset="utf-8" Stop the compiler from inlining non-trivial memset() and memcpy() (for memset() see e.g. map_vcpu_info() or kimage_load_segments() for examples). This way we even keep the compiler from using REP STOSQ / REP MOVSQ when we'd prefer REP STOSB / REP MOVSB (when ERMS is available). With gcc10 this yields a modest .text size reduction (release build) of around 2k. Unfortunately these options aren't understood by the clang versions I have readily available for testing with; I'm unaware of equivalents. Note also that using cc-option-add is not an option here, or at least I couldn't make things work with it (in case the option was not supported by the compiler): The embedded comma in the option looks to be getting in the way. Requested-by: Andrew Cooper Signed-off-by: Jan Beulich --- v3: Re-base. v2: New. --- The boundary values are of course up for discussion - I wasn't really certain whether to use 16 or 32; I'd be less certain about using yet larger values. Similarly whether to permit the compiler to emit REP STOSQ / REP MOVSQ for known size, properly aligned blocks is up for discussion. --- a/xen/arch/x86/arch.mk +++ b/xen/arch/x86/arch.mk @@ -65,6 +65,9 @@ endif $(call cc-option-add,CFLAGS_stack_boundary,CC,-mpreferred-stack-boundary= =3D3) export CFLAGS_stack_boundary =20 +CFLAGS +=3D $(call cc-option,$(CC),-mmemcpy-strategy=3Dunrolled_loop:16:no= align$(comma)libcall:-1:noalign) +CFLAGS +=3D $(call cc-option,$(CC),-mmemset-strategy=3Dunrolled_loop:16:no= align$(comma)libcall:-1:noalign) + ifeq ($(CONFIG_UBSAN),y) # Don't enable alignment sanitisation. x86 has efficient unaligned access= es, # and various things (ACPI tables, hypercall pages, stubs, etc) are wont-f= ix.