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[156.151.31.85]) by mx.google.com with ESMTPS id 1si244980plp.114.2019.02.14.03.00.51 for (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Thu, 14 Feb 2019 03:00:51 -0800 (PST) Received-SPF: pass (google.com: domain of william.kucharski@oracle.com designates 156.151.31.85 as permitted sender) client-ip=156.151.31.85; Authentication-Results: mx.google.com; dkim=pass header.i=@oracle.com header.s=corp-2018-07-02 header.b=QW7XapRi; spf=pass (google.com: domain of william.kucharski@oracle.com designates 156.151.31.85 as permitted sender) smtp.mailfrom=william.kucharski@oracle.com; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=oracle.com Received: from pps.filterd (userp2120.oracle.com [127.0.0.1]) by userp2120.oracle.com (8.16.0.27/8.16.0.27) with SMTP id x1EAwecb195540; Thu, 14 Feb 2019 11:00:45 GMT DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=oracle.com; h=content-type : mime-version : subject : from : in-reply-to : date : cc : content-transfer-encoding : message-id : references : to; s=corp-2018-07-02; bh=oBoYKrHmkB0DE74B1po/8VDjK8Xr/YU8KGJgp6PsWoo=; b=QW7XapRi9UF3HwATVM8EisoJD4kQ6XotQFX1LnXN6HmumbHSkpdH8Ay94BmR4UIasXhY NBM0J62c1Ldk3UlG0iaMpIHQDnx7wd2HHiLpW4G9apLA1TFx55ka5XKHZsOwG1ZzjA4Z p+S+iHraR3p9tQoExUD+sN7hOKiOmQT4GGpzwnBKhzOm3JU6sa860zS9MSXTwFZJ9n3V bqZ9VxsYuvl+LpwvX06ThKUR+M+U9uke0mKsj/FvHWgaTwdrab4xi/M5r6V/9/IemGwC n8Xzb0cZ0nqW22TH77Sfc5T+voDJwlRaZQJSMkPflW8oMtTvVcHTEM4mr3PhEMeADZsZ +g== Received: from userv0021.oracle.com (userv0021.oracle.com [156.151.31.71]) by userp2120.oracle.com with ESMTP id 2qhree7brc-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Thu, 14 Feb 2019 11:00:45 +0000 Received: from aserv0121.oracle.com (aserv0121.oracle.com [141.146.126.235]) by userv0021.oracle.com (8.14.4/8.14.4) with ESMTP id x1EB0d4H014736 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Thu, 14 Feb 2019 11:00:39 GMT Received: from abhmp0015.oracle.com (abhmp0015.oracle.com [141.146.116.21]) by aserv0121.oracle.com (8.14.4/8.13.8) with ESMTP id x1EB0d14012698; Thu, 14 Feb 2019 11:00:39 GMT Received: from [192.168.0.110] (/73.243.10.6) by default (Oracle Beehive Gateway v4.0) with ESMTP ; Thu, 14 Feb 2019 11:00:39 +0000 Content-Type: text/plain; charset=us-ascii Mime-Version: 1.0 (Mac OS X Mail 12.4 \(3445.104.2\)) Subject: Re: [PATCH v3 1/2] x86: respect memory size limiting via mem= parameter From: William Kucharski In-Reply-To: <20190214104240.24428-2-jgross@suse.com> Date: Thu, 14 Feb 2019 04:00:37 -0700 Cc: linux-kernel@vger.kernel.org, xen-devel@lists.xenproject.org, x86@kernel.org, linux-mm@kvack.org, boris.ostrovsky@oracle.com, sstabellini@kernel.org, hpa@zytor.com, tglx@linutronix.de, mingo@redhat.com, bp@alien8.de Content-Transfer-Encoding: 7bit Message-Id: References: <20190214104240.24428-1-jgross@suse.com> <20190214104240.24428-2-jgross@suse.com> To: Juergen Gross X-Mailer: Apple Mail (2.3445.104.2) X-Proofpoint-Virus-Version: vendor=nai engine=5900 definitions=9166 signatures=668683 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 priorityscore=1501 malwarescore=0 suspectscore=0 phishscore=0 bulkscore=0 spamscore=0 clxscore=1015 lowpriorityscore=0 mlxscore=0 impostorscore=0 mlxlogscore=999 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1810050000 definitions=main-1902140080 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: > On Feb 14, 2019, at 3:42 AM, Juergen Gross wrote: > > When limiting memory size via kernel parameter "mem=" this should be > respected even in case of memory made accessible via a PCI card. > > Today this kind of memory won't be made usable in initial memory > setup as the memory won't be visible in E820 map, but it might be > added when adding PCI devices due to corresponding ACPI table entries. > > Not respecting "mem=" can be corrected by adding a global max_mem_size > variable set by parse_memopt() which will result in rejecting adding > memory areas resulting in a memory size above the allowed limit. > > Signed-off-by: Juergen Gross > Acked-by: Ingo Molnar Reviewed-by: William Kucharski