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Mon, 4 May 2020 15:00:23 GMT Received: from aserv0121.oracle.com (aserv0121.oracle.com [141.146.126.235]) by userp3030.oracle.com with ESMTP id 30t1r2eu6m-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Mon, 04 May 2020 15:00:23 +0000 Received: from abhmp0001.oracle.com (abhmp0001.oracle.com [141.146.116.7]) by aserv0121.oracle.com (8.14.4/8.13.8) with ESMTP id 044F0ImZ026075; Mon, 4 May 2020 15:00:18 GMT Received: from linux-1.home.com (/10.175.9.166) by default (Oracle Beehive Gateway v4.0) with ESMTP ; Mon, 04 May 2020 08:00:17 -0700 From: Alexandre Chartre To: tglx@linutronix.de, mingo@redhat.com, bp@alien8.de, hpa@zytor.com, dave.hansen@linux.intel.com, luto@kernel.org, peterz@infradead.org, x86@kernel.org, linux-mm@kvack.org, linux-kernel@vger.kernel.org Cc: pbonzini@redhat.com, konrad.wilk@oracle.com, jan.setjeeilers@oracle.com, liran.alon@oracle.com, junaids@google.com, graf@amazon.de, rppt@linux.vnet.ibm.com, kuzuno@gmail.com, mgross@linux.intel.com, alexandre.chartre@oracle.com Subject: [RFC v4][PATCH part-2 11/13] mm/dpt: Add decorated page-table remap function Date: Mon, 4 May 2020 16:58:08 +0200 Message-Id: <20200504145810.11882-12-alexandre.chartre@oracle.com> X-Mailer: git-send-email 2.18.2 In-Reply-To: <20200504145810.11882-1-alexandre.chartre@oracle.com> References: <20200504145810.11882-1-alexandre.chartre@oracle.com> X-Proofpoint-Virus-Version: vendor=nai engine=6000 definitions=9610 signatures=668687 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 bulkscore=0 adultscore=0 suspectscore=0 spamscore=0 mlxlogscore=999 malwarescore=0 phishscore=0 mlxscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2003020000 definitions=main-2005040123 X-Proofpoint-Virus-Version: vendor=nai engine=6000 definitions=9610 signatures=668687 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 bulkscore=0 mlxscore=0 lowpriorityscore=0 spamscore=0 adultscore=0 clxscore=1015 suspectscore=0 priorityscore=1501 malwarescore=0 mlxlogscore=999 phishscore=0 impostorscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2003020000 definitions=main-2005040123 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: Add a function to remap an already mapped buffer with a new address in a decorated page-table: the already mapped buffer is unmapped, and a new mapping is added for the specified new address. This is useful to track and remap a buffer which can be freed and then reallocated. Signed-off-by: Alexandre Chartre --- arch/x86/include/asm/dpt.h | 1 + arch/x86/mm/dpt.c | 25 +++++++++++++++++++++++++ 2 files changed, 26 insertions(+) diff --git a/arch/x86/include/asm/dpt.h b/arch/x86/include/asm/dpt.h index fd8c1b84ffe2..3234ba968d80 100644 --- a/arch/x86/include/asm/dpt.h +++ b/arch/x86/include/asm/dpt.h @@ -57,6 +57,7 @@ extern int dpt_map_range(struct dpt *dpt, void *ptr, size_t size, enum page_table_level level); extern int dpt_map(struct dpt *dpt, void *ptr, unsigned long size); extern void dpt_unmap(struct dpt *dpt, void *ptr); +extern int dpt_remap(struct dpt *dpt, void **mapping, void *ptr, size_t size); static inline int dpt_map_module(struct dpt *dpt, char *module_name) { diff --git a/arch/x86/mm/dpt.c b/arch/x86/mm/dpt.c index adc59f9ed876..9517e3081716 100644 --- a/arch/x86/mm/dpt.c +++ b/arch/x86/mm/dpt.c @@ -809,6 +809,31 @@ int dpt_map_percpu(struct dpt *dpt, void *percpu_ptr, size_t size) } EXPORT_SYMBOL(dpt_map_percpu); +int dpt_remap(struct dpt *dpt, void **current_ptrp, void *new_ptr, size_t size) +{ + void *current_ptr = *current_ptrp; + int err; + + if (current_ptr == new_ptr) { + /* no change, already mapped */ + return 0; + } + + if (current_ptr) { + dpt_unmap(dpt, current_ptr); + *current_ptrp = NULL; + } + + err = dpt_map(dpt, new_ptr, size); + if (err) + return err; + + *current_ptrp = new_ptr; + + return 0; +} +EXPORT_SYMBOL(dpt_remap); + /* * dpt_create - allocate a page-table and create a corresponding * decorated page-table. The page-table is allocated and aligned