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 X-Spam-Level: X-Spam-Status: No, score=-9.9 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH, MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id A90A2C282DD for ; Thu, 9 Jan 2020 14:57:51 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 7C5B42072A for ; Thu, 9 Jan 2020 14:57:51 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b="fejB4S7Z" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1731935AbgAIO5u (ORCPT ); Thu, 9 Jan 2020 09:57:50 -0500 Received: from us-smtp-1.mimecast.com ([207.211.31.81]:52374 "EHLO us-smtp-delivery-1.mimecast.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1731918AbgAIO5s (ORCPT ); Thu, 9 Jan 2020 09:57:48 -0500 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1578581867; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=Nm8O4Xii0OuE4zFVyte5k6dYfDYh4EMQdTOkPftgaqU=; b=fejB4S7Zcfeq7czzSrZeICFBGTJNZDrYZHr/HyonuzeqtfBPaNsEXzEa4lJUAEnBssIULh +bXgw6wUo6uh+ae4HGD2ObpTMNKhgwMiB4hUUECVbJ4qgD9er4d3semINJZ9mH7n7Zs8bI wW9jcEQZJ7F73ekv+6rnugZhksO0BTI= Received: from mail-qv1-f69.google.com (mail-qv1-f69.google.com [209.85.219.69]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-243-nGFyknB0N9OtlZNjCwJ4UQ-1; Thu, 09 Jan 2020 09:57:46 -0500 X-MC-Unique: nGFyknB0N9OtlZNjCwJ4UQ-1 Received: by mail-qv1-f69.google.com with SMTP id g6so4275792qvp.0 for ; Thu, 09 Jan 2020 06:57:46 -0800 (PST) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=Nm8O4Xii0OuE4zFVyte5k6dYfDYh4EMQdTOkPftgaqU=; b=l2rNwxv1MDnfsbYUC4hVLErX0dc4TaAy6yWskGcbiu0dQ1+MgV2v4fPB3cj+rzUx7R WPzdeItIbCBxmM05ZXWxNDFl51Sqf/bub9pern8g7aUsXk8KBJl3zlB06In6SH6bwPr7 f2+vNRxr5BNOawGkEaPdbxtEoG5tEvtRU2T+ny6Rr/13mvptbZX6KJQPOnyPVoUK7wj3 bMqJspUjRmDPhzJ3VtIK2C4B3Pg6yBWGL2XEVcstfiOK1NrbM9R5e/diN8u2959P6Oki +fiSjctgrU9/V+Eh8JGBkM81vtVP9H0H2u2ggVwPrIUvfG6z/reMkZtEu2BhTlIM/x5R Hgew== X-Gm-Message-State: APjAAAVOK3Vmil9IJpELc05ulpYhDdvcB/xs7HZ2V8/0vPuJRT4hhzAK zZggeo4RmXGe5mYoP+2e3MLyl7y4BrUKq5mjZE5U3lxEPuI8ONITPdETbA8q8+T4Xs95jRRGvx0 NmkcNQ+A9g0ahRQTrhAAB0AkE X-Received: by 2002:ae9:ec01:: with SMTP id h1mr10129983qkg.33.1578581864674; Thu, 09 Jan 2020 06:57:44 -0800 (PST) X-Google-Smtp-Source: APXvYqzNTAs/SAnbPG+ivO60ziyJlazNT+NDxUAFeemJ1UyIi2OiGROdyCVheaB21amr6IgdyN2YNA== X-Received: by 2002:ae9:ec01:: with SMTP id h1mr10129964qkg.33.1578581864482; Thu, 09 Jan 2020 06:57:44 -0800 (PST) Received: from xz-x1.yyz.redhat.com ([104.156.64.74]) by smtp.gmail.com with ESMTPSA id q2sm3124179qkm.5.2020.01.09.06.57.41 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 09 Jan 2020 06:57:43 -0800 (PST) From: Peter Xu To: kvm@vger.kernel.org, linux-kernel@vger.kernel.org Cc: Christophe de Dinechin , "Michael S . Tsirkin" , Paolo Bonzini , Sean Christopherson , Yan Zhao , Alex Williamson , Jason Wang , Kevin Kevin , Vitaly Kuznetsov , peterx@redhat.com, "Dr . David Alan Gilbert" Subject: [PATCH v3 04/21] KVM: Add build-time error check on kvm_run size Date: Thu, 9 Jan 2020 09:57:12 -0500 Message-Id: <20200109145729.32898-5-peterx@redhat.com> X-Mailer: git-send-email 2.24.1 In-Reply-To: <20200109145729.32898-1-peterx@redhat.com> References: <20200109145729.32898-1-peterx@redhat.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org It's already going to reach 2400 Bytes (which is over half of page size on 4K page archs), so maybe it's good to have this build-time check in case it overflows when adding new fields. Signed-off-by: Peter Xu --- virt/kvm/kvm_main.c | 1 + 1 file changed, 1 insertion(+) diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c index 24c9cf4c8a52..70b78ccaf3b5 100644 --- a/virt/kvm/kvm_main.c +++ b/virt/kvm/kvm_main.c @@ -338,6 +338,7 @@ int kvm_vcpu_init(struct kvm_vcpu *vcpu, struct kvm *kvm, unsigned id) vcpu->pre_pcpu = -1; INIT_LIST_HEAD(&vcpu->blocked_vcpu_list); + BUILD_BUG_ON(sizeof(struct kvm_run) > PAGE_SIZE); page = alloc_page(GFP_KERNEL | __GFP_ZERO); if (!page) { r = -ENOMEM; -- 2.24.1