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Wed, 3 Apr 2019 17:36:02 GMT Received: from concerto.internal (/10.65.181.37) by default (Oracle Beehive Gateway v4.0) with ESMTP ; Wed, 03 Apr 2019 10:36:02 -0700 From: Khalid Aziz To: juergh@gmail.com, tycho@tycho.ws, jsteckli@amazon.de, ak@linux.intel.com, liran.alon@oracle.com, keescook@google.com, konrad.wilk@oracle.com Cc: Juerg Haefliger , deepa.srinivasan@oracle.com, chris.hyser@oracle.com, tyhicks@canonical.com, dwmw@amazon.co.uk, andrew.cooper3@citrix.com, jcm@redhat.com, boris.ostrovsky@oracle.com, kanth.ghatraju@oracle.com, joao.m.martins@oracle.com, jmattson@google.com, pradeep.vincent@oracle.com, john.haxby@oracle.com, tglx@linutronix.de, kirill.shutemov@linux.intel.com, hch@lst.de, steven.sistare@oracle.com, labbott@redhat.com, luto@kernel.org, dave.hansen@intel.com, peterz@infradead.org, aaron.lu@intel.com, akpm@linux-foundation.org, alexander.h.duyck@linux.intel.com, amir73il@gmail.com, andreyknvl@google.com, aneesh.kumar@linux.ibm.com, anthony.yznaga@oracle.com, ard.biesheuvel@linaro.org, arnd@arndb.de, arunks@codeaurora.org, ben@decadent.org.uk, bigeasy@linutronix.de, bp@alien8.de, brgl@bgdev.pl, catalin.marinas@arm.com, corbet@lwn.net, cpandya@codeaurora.org, daniel.vetter@ffwll.ch, dan.j.williams@intel.com, gregkh@linuxfoundation.org, guro@fb.com, hannes@cmpxchg.org, hpa@zytor.com, iamjoonsoo.kim@lge.com, james.morse@arm.com, jannh@google.com, jgross@suse.com, jkosina@suse.cz, jmorris@namei.org, joe@perches.com, jrdr.linux@gmail.com, jroedel@suse.de, keith.busch@intel.com, khalid.aziz@oracle.com, khlebnikov@yandex-team.ru, logang@deltatee.com, marco.antonio.780@gmail.com, mark.rutland@arm.com, mgorman@techsingularity.net, mhocko@suse.com, mhocko@suse.cz, mike.kravetz@oracle.com, mingo@redhat.com, mst@redhat.com, m.szyprowski@samsung.com, npiggin@gmail.com, osalvador@suse.de, paulmck@linux.vnet.ibm.com, pavel.tatashin@microsoft.com, rdunlap@infradead.org, richard.weiyang@gmail.com, riel@surriel.com, rientjes@google.com, robin.murphy@arm.com, rostedt@goodmis.org, rppt@linux.vnet.ibm.com, sai.praneeth.prakhya@intel.com, serge@hallyn.com, steve.capper@arm.com, thymovanbeers@gmail.com, vbabka@suse.cz, will.deacon@arm.com, willy@infradead.org, yang.shi@linux.alibaba.com, yaojun8558363@gmail.com, ying.huang@intel.com, zhangshaokun@hisilicon.com, iommu@lists.linux-foundation.org, x86@kernel.org, linux-arm-kernel@lists.infradead.org, linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, linux-security-module@vger.kernel.org Subject: [RFC PATCH v9 10/13] arm64/mm, xpfo: temporarily map dcache regions Date: Wed, 3 Apr 2019 11:34:11 -0600 Message-Id: X-Mailer: git-send-email 2.17.1 In-Reply-To: References: In-Reply-To: References: X-Proofpoint-Virus-Version: vendor=nai engine=5900 definitions=9216 signatures=668685 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 suspectscore=0 malwarescore=0 phishscore=0 bulkscore=0 spamscore=0 mlxscore=0 mlxlogscore=677 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1810050000 definitions=main-1904030118 X-Proofpoint-Virus-Version: vendor=nai engine=5900 definitions=9216 signatures=668685 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=687 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1810050000 definitions=main-1904030118 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: From: Juerg Haefliger If the page is unmapped by XPFO, a data cache flush results in a fatal page fault, so let's temporarily map the region, flush the cache, and then unmap it. CC: linux-arm-kernel@lists.infradead.org Signed-off-by: Juerg Haefliger Signed-off-by: Tycho Andersen --- v6: actually flush in the face of xpfo, and temporarily map the underlying memory so it can be flushed correctly arch/arm64/mm/flush.c | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/arch/arm64/mm/flush.c b/arch/arm64/mm/flush.c index 5c9073bace83..114e8bc5a3dc 100644 --- a/arch/arm64/mm/flush.c +++ b/arch/arm64/mm/flush.c @@ -20,6 +20,7 @@ #include #include #include +#include #include #include @@ -28,9 +29,15 @@ void sync_icache_aliases(void *kaddr, unsigned long len) { unsigned long addr = (unsigned long)kaddr; + unsigned long num_pages = XPFO_NUM_PAGES(addr, len); + void *mapping[num_pages]; if (icache_is_aliasing()) { + xpfo_temp_map(kaddr, len, mapping, + sizeof(mapping[0]) * num_pages); __clean_dcache_area_pou(kaddr, len); + xpfo_temp_unmap(kaddr, len, mapping, + sizeof(mapping[0]) * num_pages); __flush_icache_all(); } else { /* -- 2.17.1 From mboxrd@z Thu Jan 1 00:00:00 1970 From: Khalid Aziz Subject: [RFC PATCH v9 10/13] arm64/mm, xpfo: temporarily map dcache regions Date: Wed, 3 Apr 2019 11:34:11 -0600 Message-ID: References: Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: In-Reply-To: References: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: iommu-bounces-cunTk1MwBs9QetFLy7KEm3xJsTq8ys+cHZ5vskTnxNA@public.gmane.org Errors-To: iommu-bounces-cunTk1MwBs9QetFLy7KEm3xJsTq8ys+cHZ5vskTnxNA@public.gmane.org To: juergh-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org, tycho-E0fblnxP3wo@public.gmane.org, jsteckli-ebkRAfMGSJGzQB+pC5nmwQ@public.gmane.org, ak-VuQAYsv1563Yd54FQh9/CA@public.gmane.org, liran.alon-QHcLZuEGTsvQT0dZR+AlfA@public.gmane.org, keescook-hpIqsD4AKlfQT0dZR+AlfA@public.gmane.org, konrad.wilk-QHcLZuEGTsvQT0dZR+AlfA@public.gmane.org Cc: catalin.marinas-5wv7dgnIgG8@public.gmane.org, will.deacon-5wv7dgnIgG8@public.gmane.org, khalid.aziz-QHcLZuEGTsvQT0dZR+AlfA@public.gmane.org, steven.sistare-QHcLZuEGTsvQT0dZR+AlfA@public.gmane.org, hch-jcswGhMUV9g@public.gmane.org, aneesh.kumar-tEXmvtCZX7AybS5Ee8rs3A@public.gmane.org, jmorris-gx6/JNMH7DfYtjvyW6yDsg@public.gmane.org, rientjes-hpIqsD4AKlfQT0dZR+AlfA@public.gmane.org, anthony.yznaga-QHcLZuEGTsvQT0dZR+AlfA@public.gmane.org, riel-ebMLmSuQjDVBDgjK7y7TUQ@public.gmane.org, npiggin-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org, rppt-23VcF4HTsmIX0ybBhKVfKdBPR1lH4CV8@public.gmane.org, luto-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org, tglx-hfZtesqFncYOwBW4kG4KsQ@public.gmane.org, jkosina-AlSwsSmVLrQ@public.gmane.org, rdunlap-wEGCiKHe2LqWVfeAwA7xHQ@public.gmane.org, linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, jrdr.linux-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org, gregkh-hQyY1W1yCW8ekmWlsbkhG0B+6BGkLq7r@public.gmane.org, joe-6d6DIl74uiNBDgjK7y7TUQ@public.gmane.org, arunks-sgV2jX0FEOL9JmXXK+q4OQ@public.gmane.org, akpm-de/tnXTf+JLsfHDXvbKv3WD2FQJk+8+b@public.gmane.org, dwmw-vV1OtcyAfmbQXOPxS62xeg@public.gmane.org, mark.rutland-5wv7dgnIgG8@public.gmane.org, linux-doc-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, keith.busch-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org, joao.m.martins-QHcLZuEGTsvQT0dZR+AlfA@public.gmane.org, hpa-YMNOUZJC4hwAvxtiuMwx3w@public.gmane.org, brgl-ARrdPY/1zhM@public.gmane.org, jroedel-l3A5Bk7waGM@public.gmane.org, zhangshaokun-C8/M+/jPZTeaMJb+Lgu22Q@public.gmane.org, boris.ostrovsky-QHcLZuEGTsvQT0dZR+AlfA@public.gmane.org, chris.hyser-QHcLZuEGTsvQT0dZR+AlfA@public.gmane.org, linux-arm-kernel-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org, aaron.lu-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org, steve.capper-5wv7dgnIgG8@public.gmane.org, james.morse-5wv7dgnIgG8@public.gmane.org, iamjoonsoo.kim-Hm3cg6mZ9cc@public.gmane.org, mike.kravetz@oracle. List-Id: iommu@lists.linux-foundation.org From: Juerg Haefliger If the page is unmapped by XPFO, a data cache flush results in a fatal page fault, so let's temporarily map the region, flush the cache, and then unmap it. CC: linux-arm-kernel-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org Signed-off-by: Juerg Haefliger Signed-off-by: Tycho Andersen --- v6: actually flush in the face of xpfo, and temporarily map the underlying memory so it can be flushed correctly arch/arm64/mm/flush.c | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/arch/arm64/mm/flush.c b/arch/arm64/mm/flush.c index 5c9073bace83..114e8bc5a3dc 100644 --- a/arch/arm64/mm/flush.c +++ b/arch/arm64/mm/flush.c @@ -20,6 +20,7 @@ #include #include #include +#include #include #include @@ -28,9 +29,15 @@ void sync_icache_aliases(void *kaddr, unsigned long len) { unsigned long addr = (unsigned long)kaddr; + unsigned long num_pages = XPFO_NUM_PAGES(addr, len); + void *mapping[num_pages]; if (icache_is_aliasing()) { + xpfo_temp_map(kaddr, len, mapping, + sizeof(mapping[0]) * num_pages); __clean_dcache_area_pou(kaddr, len); + xpfo_temp_unmap(kaddr, len, mapping, + sizeof(mapping[0]) * num_pages); __flush_icache_all(); } else { /* -- 2.17.1