From nobody Sat Feb 7 07:31:09 2026 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=1619103059; cv=none; d=zohomail.com; s=zohoarc; b=flzFYovfqtcNG1YepO2Pmk/ph5p0WFKT/qva060tDx/6WeDTKavICEYbV0oYniPKmrQolDp2YVvyQCkZI8vlfJTNZzKtBwo9obaYeGjZdgUK6UYbJS7EyzFviinSfOpd9nJXKgFRqa3UylYGy53JaSg3H6od630Pa3f/wYRfNwk= ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=zohomail.com; s=zohoarc; t=1619103059; h=Content-Type:Content-Transfer-Encoding:Cc:Date:From:In-Reply-To:List-Subscribe:List-Post:List-Id:List-Help:List-Unsubscribe:MIME-Version:Message-ID:References:Sender:Subject:To; bh=8opvY7uAAKKl+VTk1uX8v+giIhvZM4yDWQN/O3L3BD0=; b=mj3QJfuzuFlPA6rGe7oJQWGCeWDFe5Zmv55ceWLhQK8Nl+mxEldfnw+7P27F2dtg6pcNzwTLcUcWBGLfhKjo+ucjtLJCx/cUyfY2F80uhNicYJOgXil7ZzbIaEJWm7O0lXV9MCviQE7joTVtS3DqV95CR3VwfHZm/ATl8G/nIY8= 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) header.from= Return-Path: Received: from lists.xenproject.org (lists.xenproject.org [192.237.175.120]) by mx.zohomail.com with SMTPS id 1619103059234882.848458784967; Thu, 22 Apr 2021 07:50:59 -0700 (PDT) Received: from list by lists.xenproject.org with outflank-mailman.115508.220403 (Exim 4.92) (envelope-from ) id 1lZafC-00053a-0V; Thu, 22 Apr 2021 14:50:42 +0000 Received: by outflank-mailman (output) from mailman id 115508.220403; Thu, 22 Apr 2021 14:50:41 +0000 Received: from localhost ([127.0.0.1] helo=lists.xenproject.org) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1lZafB-00053T-Ti; Thu, 22 Apr 2021 14:50:41 +0000 Received: by outflank-mailman (input) for mailman id 115508; Thu, 22 Apr 2021 14:50:41 +0000 Received: from all-amaz-eas1.inumbo.com ([34.197.232.57] helo=us1-amaz-eas2.inumbo.com) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1lZafB-00053M-0t for xen-devel@lists.xenproject.org; Thu, 22 Apr 2021 14:50:41 +0000 Received: from mx2.suse.de (unknown [195.135.220.15]) by us1-amaz-eas2.inumbo.com (Halon) with ESMTPS id e877c9df-396e-4d3d-babf-7035a0da8ede; Thu, 22 Apr 2021 14:50:40 +0000 (UTC) Received: from relay2.suse.de (unknown [195.135.221.27]) by mx2.suse.de (Postfix) with ESMTP id 7E701AEC6; Thu, 22 Apr 2021 14:50:39 +0000 (UTC) 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: e877c9df-396e-4d3d-babf-7035a0da8ede X-Virus-Scanned: by amavisd-new at test-mx.suse.de DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=suse.com; s=susede1; t=1619103039; h=from:from:reply-to:date:date:message-id:message-id:to:to:cc:cc: mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=8opvY7uAAKKl+VTk1uX8v+giIhvZM4yDWQN/O3L3BD0=; b=NnH0ao7PeJ7xx6CqWxxfekzBqhEfxincSwKDwUwRX+EzXPGc/ci3yMfQXRf27SrZzLask1 Nx0pBksaUD6dhP4b/MNIVyxFc8FBrjp21p7JjbzXQSsfC/Bw+Zc72pQYvfUbKKzGkYTurk 5jaDGLh9rFgtP9IOq+oqGRx98ECrqq4= Subject: [PATCH v3 11/22] x86/CPUID: move bounding of max_{,sub}leaf fields to library code From: Jan Beulich To: "xen-devel@lists.xenproject.org" Cc: Andrew Cooper , George Dunlap , Wei Liu , =?UTF-8?Q?Roger_Pau_Monn=c3=a9?= References: <322de6db-e01f-0b57-5777-5d94a13c441a@suse.com> Message-ID: <079ec0a9-fde7-e7a9-40d1-bea50a0c9a0a@suse.com> Date: Thu, 22 Apr 2021 16:50:39 +0200 User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:78.0) Gecko/20100101 Thunderbird/78.10.0 MIME-Version: 1.0 In-Reply-To: <322de6db-e01f-0b57-5777-5d94a13c441a@suse.com> Content-Language: en-US Content-Transfer-Encoding: quoted-printable X-ZohoMail-DKIM: pass (identity @suse.com) Content-Type: text/plain; charset="utf-8" Break out this logic from calculate_host_policy() to also use it in the x86 emulator harness, where subsequently we'll want to avoid open-coding AMX maximum palette bounding. Signed-off-by: Jan Beulich --- v2: New. --- a/tools/tests/x86_emulator/x86-emulate.c +++ b/tools/tests/x86_emulator/x86-emulate.c @@ -79,6 +79,7 @@ bool emul_test_init(void) unsigned long sp; =20 x86_cpuid_policy_fill_native(&cp); + x86_cpuid_policy_bound_max_leaves(&cp); =20 /* * The emulator doesn't use these instructions, so can always emulate @@ -91,6 +92,8 @@ bool emul_test_init(void) cp.feat.rdpid =3D true; cp.extd.clzero =3D true; =20 + x86_cpuid_policy_shrink_max_leaves(&cp); + if ( cpu_has_xsave ) { unsigned int tmp, ebx; --- a/xen/arch/x86/cpuid.c +++ b/xen/arch/x86/cpuid.c @@ -322,12 +322,7 @@ static void __init calculate_host_policy =20 *p =3D raw_cpuid_policy; =20 - p->basic.max_leaf =3D - min_t(uint32_t, p->basic.max_leaf, ARRAY_SIZE(p->basic.raw) - 1); - p->feat.max_subleaf =3D - min_t(uint32_t, p->feat.max_subleaf, ARRAY_SIZE(p->feat.raw) - 1); - p->extd.max_leaf =3D 0x80000000 | min_t(uint32_t, p->extd.max_leaf & 0= xffff, - ARRAY_SIZE(p->extd.raw) - 1); + x86_cpuid_policy_bound_max_leaves(p); =20 cpuid_featureset_to_policy(boot_cpu_data.x86_capability, p); recalculate_xstate(p); --- a/xen/include/xen/lib/x86/cpuid.h +++ b/xen/include/xen/lib/x86/cpuid.h @@ -352,6 +352,12 @@ void x86_cpuid_policy_fill_native(struct void x86_cpuid_policy_clear_out_of_range_leaves(struct cpuid_policy *p); =20 /** + * Bound max leaf/subleaf values according to the capacity of the respecti= ve + * arrays in struct cpuid_policy. + */ +void x86_cpuid_policy_bound_max_leaves(struct cpuid_policy *p); + +/** * Shrink max leaf/subleaf values such that the last respective valid entry * isn't all blank. While permitted by the spec, such extraneous leaves m= ay * provide undue "hints" to guests. --- a/xen/lib/x86/cpuid.c +++ b/xen/lib/x86/cpuid.c @@ -238,6 +238,16 @@ void x86_cpuid_policy_clear_out_of_range ARRAY_SIZE(p->extd.raw) - 1); } =20 +void x86_cpuid_policy_bound_max_leaves(struct cpuid_policy *p) +{ + p->basic.max_leaf =3D + min_t(uint32_t, p->basic.max_leaf, ARRAY_SIZE(p->basic.raw) - 1); + p->feat.max_subleaf =3D + min_t(uint32_t, p->feat.max_subleaf, ARRAY_SIZE(p->feat.raw) - 1); + p->extd.max_leaf =3D 0x80000000 | min_t(uint32_t, p->extd.max_leaf & 0= xffff, + ARRAY_SIZE(p->extd.raw) - 1); +} + void x86_cpuid_policy_shrink_max_leaves(struct cpuid_policy *p) { unsigned int i;