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 lists.xenproject.org (lists.xenproject.org [192.237.175.120]) (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 7BC46D3A678 for ; Tue, 29 Oct 2024 18:26:58 +0000 (UTC) Received: from list by lists.xenproject.org with outflank-mailman.827826.1242577 (Exim 4.92) (envelope-from ) id 1t5qvV-0004OY-Sa; Tue, 29 Oct 2024 18:26:45 +0000 X-Outflank-Mailman: Message body and most headers restored to incoming version Received: by outflank-mailman (output) from mailman id 827826.1242577; Tue, 29 Oct 2024 18:26:45 +0000 Received: from localhost ([127.0.0.1] helo=lists.xenproject.org) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1t5qvV-0004OQ-PX; Tue, 29 Oct 2024 18:26:45 +0000 Received: by outflank-mailman (input) for mailman id 827826; Tue, 29 Oct 2024 18:26:44 +0000 Received: from se1-gles-flk1-in.inumbo.com ([94.247.172.50] helo=se1-gles-flk1.inumbo.com) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1t5qvU-0004KP-Jg for xen-devel@lists.xenproject.org; Tue, 29 Oct 2024 18:26:44 +0000 Received: from mail-ej1-x62c.google.com (mail-ej1-x62c.google.com [2a00:1450:4864:20::62c]) by se1-gles-flk1.inumbo.com (Halon) with ESMTPS id 5779c074-9623-11ef-99a3-01e77a169b0f; Tue, 29 Oct 2024 19:26:40 +0100 (CET) Received: by mail-ej1-x62c.google.com with SMTP id a640c23a62f3a-a9a26a5d6bfso886719766b.1 for ; Tue, 29 Oct 2024 11:26:40 -0700 (PDT) Received: from localhost ([217.156.233.154]) by smtp.gmail.com with ESMTPSA id a640c23a62f3a-a9b30c7adadsm502134666b.175.2024.10.29.11.26.39 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Tue, 29 Oct 2024 11:26:39 -0700 (PDT) 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: 5779c074-9623-11ef-99a3-01e77a169b0f X-Custom-Connection: eyJyZW1vdGVpcCI6IjJhMDA6MTQ1MDo0ODY0OjIwOjo2MmMiLCJoZWxvIjoibWFpbC1lajEteDYyYy5nb29nbGUuY29tIn0= X-Custom-Transaction: eyJpZCI6IjU3NzljMDc0LTk2MjMtMTFlZi05OWEzLTAxZTc3YTE2OWIwZiIsInRzIjoxNzMwMjI2NDAwLjkwNDY1Nywic2VuZGVyIjoiYWxlamFuZHJvLnZhbGxlam9AY2xvdWQuY29tIiwicmVjaXBpZW50IjoieGVuLWRldmVsQGxpc3RzLnhlbnByb2plY3Qub3JnIn0= DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=cloud.com; s=cloud; t=1730226400; x=1730831200; darn=lists.xenproject.org; h=in-reply-to:references:to:from:subject:cc:message-id:date :content-transfer-encoding:mime-version:from:to:cc:subject:date :message-id:reply-to; bh=Q6JrJRDM7bg2hJrU/89bqF5ROISm6zgfOMVlqD8j/Hc=; b=Trbq0BiQFdaSvc8SKidoLjK7HUBn48UaJ1RWlZHyPTo6T9spfiFgXLTnptQc/+OQLM F5H7iffvfxnTGIPqIciCFonWjkRucEe3a5Q2InqifWQIc3T+fIg0pWw78Jnw7YVdfjzH f7L9cQGrwwey/9graG4piLLK3vjx9fhbGywnU= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1730226400; x=1730831200; h=in-reply-to:references:to:from:subject:cc:message-id:date :content-transfer-encoding:mime-version:x-gm-message-state:from:to :cc:subject:date:message-id:reply-to; bh=Q6JrJRDM7bg2hJrU/89bqF5ROISm6zgfOMVlqD8j/Hc=; b=LVOqeKQvGtTzAjjpiykZUbV2WkQN4dEVfbOG+7ud+EtYAGbbVjVT6BWdHzsWMG1diI WLqOzWAxCC+ZnkoS3OFwr+DCLjN+vMvX/CexwEZaww1Xx8Lte4lfjeQLZDNMO8E5lPvz 3wCuCAT4wbFmkkYBXKELXo9RBK8LD3FddNS3AZdZeJUXgXWXVELGWv2WEoeHU1TyDMcz 7nrtzKE5H331YNw4M7xcwqkqzsMKsb44uyZ/OoGXgjHKu/LU9bTYg1t3rZzi53bIYgw9 QuqpPJwuqPwDdS+g4vQr/BgWH9EvbMkFm35tS2c83NawaMuHrHHBf5BFh19negogGfND tP+g== X-Forwarded-Encrypted: i=1; AJvYcCWl8zA4Vluek563gMC+ptzDKilWoN2ptt7V0biPiROIdbod72UR38PyFTuDw6At8i4fog1SGyHrve8=@lists.xenproject.org X-Gm-Message-State: AOJu0Yzcti0hq3KWakLqur51dxstu6WGe8GhOKdYMo6l/1I4MprTnue7 ZdbOv1mBpY/OIr/ZaNUxHL8VVdletUQJos8IRpdrf585BirsVTu/73DN1xw1lyA= X-Google-Smtp-Source: AGHT+IEG96jJMLVa/zEsvtbB49D2/vxji/KujMcIpX5443FvnaMMYS3mf70tEmQ5kkAIISmSa7Msog== X-Received: by 2002:a17:907:3e1c:b0:a90:df6f:f086 with SMTP id a640c23a62f3a-a9de5c9f32amr1106527166b.11.1730226400272; Tue, 29 Oct 2024 11:26:40 -0700 (PDT) Mime-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset=UTF-8 Date: Tue, 29 Oct 2024 18:26:38 +0000 Message-Id: Cc: "Jan Beulich" , =?utf-8?q?Roger_Pau_Monn=C3=A9?= Subject: Re: [PATCH] x86/cpu-policy: Extend the guest max policy max leaf/subleaves From: "Alejandro Vallejo" To: "Andrew Cooper" , "Xen-devel" X-Mailer: aerc 0.18.2 References: <20241029175505.2698661-1-andrew.cooper3@citrix.com> In-Reply-To: <20241029175505.2698661-1-andrew.cooper3@citrix.com> On Tue Oct 29, 2024 at 5:55 PM GMT, Andrew Cooper wrote: > We already have one migration case opencoded (feat.max_subleaf). A more > recent discovery is that we advertise x2APIC to guests without ensuring t= hat > we provide max_leaf >=3D 0xb. > > In general, any leaf known to Xen can be safely configured by the toolsta= ck if > it doesn't violate other constraints. > > Therefore, introduce guest_common_{max,default}_leaves() to generalise th= e > special case we currently have for feat.max_subleaf, in preparation to be= able > to provide x2APIC topology in leaf 0xb even on older hardware. > > Signed-off-by: Andrew Cooper Reviewed-by: Alejandro Vallejo Cheers, Alejandro