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Thu, 07 May 2020 00:43:15 +0000 Received: from pps.filterd (userp3020.oracle.com [127.0.0.1]) by userp3020.oracle.com (8.16.0.42/8.16.0.42) with SMTP id 0470auqu170921; Thu, 7 May 2020 00:43:14 GMT Received: from userv0122.oracle.com (userv0122.oracle.com [156.151.31.75]) by userp3020.oracle.com with ESMTP id 30us7p2ma0-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Thu, 07 May 2020 00:43:14 +0000 Received: from abhmp0014.oracle.com (abhmp0014.oracle.com [141.146.116.20]) by userv0122.oracle.com (8.14.4/8.14.4) with ESMTP id 0470hB01025731; Thu, 7 May 2020 00:43:11 GMT Received: from ayz-linux.localdomain (/68.7.158.207) by default (Oracle Beehive Gateway v4.0) with ESMTP ; Wed, 06 May 2020 17:43:11 -0700 From: Anthony Yznaga To: linux-mm@kvack.org, linux-kernel@vger.kernel.org Cc: willy@infradead.org, corbet@lwn.net, tglx@linutronix.de, mingo@redhat.com, bp@alien8.de, x86@kernel.org, hpa@zytor.com, dave.hansen@linux.intel.com, luto@kernel.org, peterz@infradead.org, rppt@linux.ibm.com, akpm@linux-foundation.org, hughd@google.com, ebiederm@xmission.com, masahiroy@kernel.org, ardb@kernel.org, ndesaulniers@google.com, dima@golovin.in, daniel.kiper@oracle.com, nivedita@alum.mit.edu, rafael.j.wysocki@intel.com, dan.j.williams@intel.com, zhenzhong.duan@oracle.com, jroedel@suse.de, bhe@redhat.com, guro@fb.com, Thomas.Lendacky@amd.com, andriy.shevchenko@linux.intel.com, keescook@chromium.org, hannes@cmpxchg.org, minchan@kernel.org, mhocko@kernel.org, ying.huang@intel.com, yang.shi@linux.alibaba.com, gustavo@embeddedor.com, ziqian.lzq@antfin.com, vdavydov.dev@gmail.com, jason.zeng@intel.com, kevin.tian@intel.com, zhiyuan.lv@intel.com, lei.l.li@intel.com, paul.c.lai@intel.com, ashok.raj@intel.com, linux-fsdevel@vger.kernel.org, linux-doc@vger.kernel.org, kexec@lists.infradead.org Subject: [RFC 16/43] kexec: PKRAM: prevent kexec clobbering preserved pages in some cases Date: Wed, 6 May 2020 17:41:42 -0700 Message-Id: <1588812129-8596-17-git-send-email-anthony.yznaga@oracle.com> X-Mailer: git-send-email 1.8.3.1 In-Reply-To: <1588812129-8596-1-git-send-email-anthony.yznaga@oracle.com> References: <1588812129-8596-1-git-send-email-anthony.yznaga@oracle.com> X-Proofpoint-Virus-Version: vendor=nai engine=6000 definitions=9613 signatures=668687 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 bulkscore=0 adultscore=0 suspectscore=2 mlxlogscore=999 malwarescore=0 phishscore=0 mlxscore=0 spamscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2003020000 definitions=main-2005070001 X-Proofpoint-Virus-Version: vendor=nai engine=6000 definitions=9613 signatures=668687 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 adultscore=0 suspectscore=2 mlxscore=0 spamscore=0 clxscore=1015 priorityscore=1501 bulkscore=0 phishscore=0 impostorscore=0 malwarescore=0 lowpriorityscore=0 mlxlogscore=999 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2003020000 definitions=main-2005070001 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org When loading a kernel for kexec, dynamically update the list of physical ranges that are not to be used for storing preserved pages with the ranges where kexec segments will be copied to on reboot. This ensures no pages preserved after the new kernel has been loaded will reside in these ranges on reboot. Not yet handled is the case where pages have been preserved before a kexec kernel is loaded. This will be covered by a later patch. Signed-off-by: Anthony Yznaga --- kernel/kexec.c | 9 +++++++++ kernel/kexec_file.c | 10 ++++++++++ 2 files changed, 19 insertions(+) diff --git a/kernel/kexec.c b/kernel/kexec.c index f977786fe498..c44598fc42a1 100644 --- a/kernel/kexec.c +++ b/kernel/kexec.c @@ -16,6 +16,7 @@ #include #include #include +#include #include "kexec_internal.h" @@ -163,6 +164,14 @@ static int do_kexec_load(unsigned long entry, unsigned long nr_segments, if (ret) goto out; + for (i = 0; i < nr_segments; i++) { + unsigned long mem = image->segment[i].mem; + size_t memsz = image->segment[i].memsz; + + if (memsz) + pkram_ban_region(PFN_DOWN(mem), PFN_UP(mem + memsz) - 1); + } + /* Install the new kernel and uninstall the old */ image = xchg(dest_image, image); diff --git a/kernel/kexec_file.c b/kernel/kexec_file.c index faa74d5f6941..f57f72237859 100644 --- a/kernel/kexec_file.c +++ b/kernel/kexec_file.c @@ -26,6 +26,8 @@ #include #include #include +#include + #include "kexec_internal.h" static int kexec_calculate_store_digests(struct kimage *image); @@ -445,6 +447,14 @@ SYSCALL_DEFINE5(kexec_file_load, int, kernel_fd, int, initrd_fd, if (ret) goto out; + for (i = 0; i < image->nr_segments; i++) { + unsigned long mem = image->segment[i].mem; + size_t memsz = image->segment[i].memsz; + + if (memsz) + pkram_ban_region(PFN_DOWN(mem), PFN_UP(mem + memsz) - 1); + } + /* * Free up any temporary buffers allocated which are not needed * after image has been loaded -- 2.13.3