From nobody Thu Apr 25 02:29:51 2024 Delivered-To: importer@patchew.org Authentication-Results: mx.zohomail.com; dkim=pass; spf=pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org; dmarc=pass(p=none dis=none) header.from=redhat.com ARC-Seal: i=1; a=rsa-sha256; t=1663778217; cv=none; d=zohomail.com; s=zohoarc; b=jcLpSWZ7t16RE2lJC9PGexBysE+q8MToarm+efD3HnPQ7qJUfrCCc0gyMJKhhiZ8AvIA4DZt6isiJUySV2yA2dLVK3PfMXCSugW9kqIcQOKWlZSpI616L5VYArL3UV1DR2AKvOfvq0qjc0R3JyJJ74hfTFnVVU+bmk2MSQj9KMA= ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=zohomail.com; s=zohoarc; t=1663778217; h=Content-Type:Content-Transfer-Encoding:Cc:Date:From:List-Subscribe:List-Post:List-Id:List-Archive:List-Help:List-Unsubscribe:MIME-Version:Message-ID:Sender:Subject:To; bh=kyYFerlLKWf+eSQUgf9DyqGMgbmIhxiql0vE/9q9P34=; b=YJze5bkScOXu3wHyELTzWItlX1qQlCQ2IB7Kl0KauzdqlzLYUCDxvLsaBqF/QqY+pM6L8CKKfHHbHvrojm8FhH8YMyv5RT++IwJgecE017fHbtXaVu6SYcxafAJDE4/ad9AOTBsYi/FN0Grz6Qq8slDJvpXvTssmt3fHCVuUkFQ= ARC-Authentication-Results: i=1; mx.zohomail.com; dkim=pass; spf=pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org; dmarc=pass header.from= (p=none dis=none) Return-Path: Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) by mx.zohomail.com with SMTPS id 1663778217344210.9049935702526; Wed, 21 Sep 2022 09:36:57 -0700 (PDT) Received: from localhost ([::1]:49886 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1ob2iU-0007Da-V5 for importer@patchew.org; Wed, 21 Sep 2022 12:36:54 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:55962) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1ob2Kz-0002z0-Ej for qemu-devel@nongnu.org; Wed, 21 Sep 2022 12:12:37 -0400 Received: from us-smtp-delivery-124.mimecast.com ([170.10.133.124]:38082) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1ob2Kv-0001F4-PU for qemu-devel@nongnu.org; Wed, 21 Sep 2022 12:12:35 -0400 Received: from mail-qt1-f197.google.com (mail-qt1-f197.google.com [209.85.160.197]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.3, cipher=TLS_AES_128_GCM_SHA256) id us-mta-172-HouGPgkANSyIFSGL9ST37g-1; Wed, 21 Sep 2022 12:12:30 -0400 Received: by mail-qt1-f197.google.com with SMTP id h7-20020ac85047000000b0035a6794699bso4483868qtm.3 for ; Wed, 21 Sep 2022 09:12:30 -0700 (PDT) Received: from localhost.localdomain (bras-base-aurron9127w-grc-46-70-31-27-79.dsl.bell.ca. [70.31.27.79]) by smtp.gmail.com with ESMTPSA id e24-20020ac84918000000b003445d06a622sm1821407qtq.86.2022.09.21.09.12.28 (version=TLS1_3 cipher=TLS_CHACHA20_POLY1305_SHA256 bits=256/256); Wed, 21 Sep 2022 09:12:29 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1663776752; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding; bh=kyYFerlLKWf+eSQUgf9DyqGMgbmIhxiql0vE/9q9P34=; b=i7sVSVfao20oXFl4nCVn2za+0nyCUXn7vwrcYwpejGu5aogz9u/4a2uD06y8HhiyvX1Z/f g9yKrHc31x9+1EmRrIeRc+eo7wqSm7LpCu/7cnrKthMpJz53PG+YMnOisxGujeSz4sA6Ta I9ui+/FIDkp/Yr6tpGCHl2N0nkSlXvs= X-MC-Unique: HouGPgkANSyIFSGL9ST37g-1 X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=content-transfer-encoding:mime-version:message-id:date:subject:cc :to:from:x-gm-message-state:from:to:cc:subject:date; bh=kyYFerlLKWf+eSQUgf9DyqGMgbmIhxiql0vE/9q9P34=; b=uNjxDcdl+y9G0pLX7bqe0+oHtXNJyHroiJ1hyUwlG20kBANtDBXTIaxH0R9AlUMTK5 hJ7lcnNQcKlyZe2jbQU+AM/yRookdXCUZcE9ywv6cpBmXH+ep8oZgCiYCi5TnBBUAFj7 UXPvZEoD6fSZv6Mnu63UrFxz84XgEdYp3AmKOBn86eFUOdIpBqpSh8rsOmWl4bHOEhiR IWZ5gdIzthC67vMQtrVXFi1ZF6HZwZgjKsJky5rfHlQ7mYMZlXk1GnQJJBGwnlbaSXzO tYr9Yyuwl8CGsrCRu5y9HQ/en+oEeibShD6uOuqNEPVHNahz7qLHs0pED5b+1f0B5Ca3 7GrQ== X-Gm-Message-State: ACrzQf1VhN2amGnHL8ruFK/1iE6NzSGPU3/Pi6E7nUVGq22R6TLx6Bww nJj/smFqFC6vSWzLUpG9k4KpHEa3xiKOuBTYzc9+fZG0J8RTrCoT6DYdO8xeKRexQvqwrc1LtW5 91UqjRzRX9V58Yv3lptM5lTI8HShXMiTOAec07LdpoNTpK/QFBrxnuq4kgonNipbZ X-Received: by 2002:ac8:594b:0:b0:35c:d0b7:e2f9 with SMTP id 11-20020ac8594b000000b0035cd0b7e2f9mr21754827qtz.483.1663776749842; Wed, 21 Sep 2022 09:12:29 -0700 (PDT) X-Google-Smtp-Source: AMsMyM69y/k5H1irHxgTghRfUrPjppe4vGVe8tStJFEdusU/UfOrrosoKRcI76BM0bwmK7Xvp8EXrA== X-Received: by 2002:ac8:594b:0:b0:35c:d0b7:e2f9 with SMTP id 11-20020ac8594b000000b0035cd0b7e2f9mr21754800qtz.483.1663776749560; Wed, 21 Sep 2022 09:12:29 -0700 (PDT) From: Peter Xu To: qemu-devel@nongnu.org Cc: Jason Wang , "Michael S . Tsirkin" , Paolo Bonzini , peterx@redhat.com, Igor Mammedov , David Woodhouse , Claudio Fontana Subject: [PATCH] Revert "intel_iommu: Fix irqchip / X2APIC configuration checks" Date: Wed, 21 Sep 2022 12:12:27 -0400 Message-Id: <20220921161227.57259-1-peterx@redhat.com> X-Mailer: git-send-email 2.32.0 MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=170.10.133.124; envelope-from=peterx@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -27 X-Spam_score: -2.8 X-Spam_bar: -- X-Spam_report: (-2.8 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.001, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_LOW=-0.7, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" X-ZohoMail-DKIM: pass (identity @redhat.com) X-ZM-MESSAGEID: 1663778219517100001 Content-Type: text/plain; charset="utf-8" It's true that when vcpus<=3D255 we don't require the length of 32bit APIC IDs. However here since we already have EIM=3DON it means the hypervisor will declare the VM as x2apic supported (e.g. VT-d ECAP register will have EIM bit 4 set), so the guest should assume the APIC IDs are 32bits width even if vcpus<=3D255. In short, commit 77250171bdc breaks any simple cmdli= ne that wants to boot a VM with >=3D9 but <=3D255 vcpus with: -device intel-iommu,intremap=3Don For anyone who does not want to enable x2apic, we can use eim=3Doff in the intel-iommu parameters to skip enabling KVM x2apic. This partly reverts commit 77250171bdc02aee106083fd2a068147befa1a38, while keeping the valid bit on checking split irqchip, but revert the other chang= e. Cc: David Woodhouse Cc: Claudio Fontana Cc: Igor Mammedov Signed-off-by: Peter Xu --- hw/i386/intel_iommu.c | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/hw/i386/intel_iommu.c b/hw/i386/intel_iommu.c index 05d53a1aa9..6524c2ee32 100644 --- a/hw/i386/intel_iommu.c +++ b/hw/i386/intel_iommu.c @@ -3818,6 +3818,11 @@ static bool vtd_decide_config(IntelIOMMUState *s, Er= ror **errp) error_setg(errp, "eim=3Don requires accel=3Dkvm,kernel-irqchip= =3Dsplit"); return false; } + if (!kvm_enable_x2apic()) { + error_setg(errp, "eim=3Don requires support on the KVM side" + "(X2APIC_API, first shipped in v4.7)"); + return false; + } } =20 /* Currently only address widths supported are 39 and 48 bits */ --=20 2.32.0