From: Khalid Aziz <khalid.aziz@oracle.com> To: juergh@gmail.com, tycho@tycho.ws, jsteckli@amazon.de, ak@linux.intel.com, torvalds@linux-foundation.org, liran.alon@oracle.com, keescook@google.com, akpm@linux-foundation.org, mhocko@suse.com, catalin.marinas@arm.com, will.deacon@arm.com, jmorris@namei.org, konrad.wilk@oracle.com Cc: Juerg Haefliger <juerg.haefliger@canonical.com>, 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, oao.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, kernel-hardening@lists.openwall.com, linux-mm@kvack.org, x86@kernel.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, Tycho Andersen <tycho@docker.com> Subject: [RFC PATCH v8 07/14] arm64/mm, xpfo: temporarily map dcache regions Date: Wed, 13 Feb 2019 17:01:30 -0700 [thread overview] Message-ID: <ea50404604bdbe1547601b6ea0af89e3da8886b0.1550088114.git.khalid.aziz@oracle.com> (raw) In-Reply-To: <cover.1550088114.git.khalid.aziz@oracle.com> In-Reply-To: <cover.1550088114.git.khalid.aziz@oracle.com> From: Juerg Haefliger <juerg.haefliger@canonical.com> 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. v6: actually flush in the face of xpfo, and temporarily map the underlying memory so it can be flushed correctly CC: linux-arm-kernel@lists.infradead.org Signed-off-by: Juerg Haefliger <juerg.haefliger@canonical.com> Signed-off-by: Tycho Andersen <tycho@docker.com> --- 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 30695a868107..fad09aafd9d5 100644 --- a/arch/arm64/mm/flush.c +++ b/arch/arm64/mm/flush.c @@ -20,6 +20,7 @@ #include <linux/export.h> #include <linux/mm.h> #include <linux/pagemap.h> +#include <linux/xpfo.h> #include <asm/cacheflush.h> #include <asm/cache.h> @@ -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 { flush_icache_range(addr, addr + len); -- 2.17.1
WARNING: multiple messages have this Message-ID (diff)
From: Khalid Aziz <khalid.aziz@oracle.com> To: juergh@gmail.com, tycho@tycho.ws, jsteckli@amazon.de, ak@linux.intel.com, torvalds@linux-foundation.org, liran.alon@oracle.com, keescook@google.com, akpm@linux-foundation.org, mhocko@suse.com, catalin.marinas@arm.com, will.deacon@arm.com, jmorris@namei.org, konrad.wilk@oracle.com Cc: tglx@linutronix.de, kernel-hardening@lists.openwall.com, peterz@infradead.org, dave.hansen@intel.com, deepa.srinivasan@oracle.com, steven.sistare@oracle.com, Tycho Andersen <tycho@docker.com>, hch@lst.de, x86@kernel.org, kanth.ghatraju@oracle.com, labbott@redhat.com, pradeep.vincent@oracle.com, jcm@redhat.com, luto@kernel.org, boris.ostrovsky@oracle.com, chris.hyser@oracle.com, linux-arm-kernel@lists.infradead.org, jmattson@google.com, linux-mm@kvack.org, andrew.cooper3@citrix.com, linux-kernel@vger.kernel.org, tyhicks@canonical.com, john.haxby@oracle.com, Juerg Haefliger <juerg.haefliger@canonical.com>, oao.m.martins@oracle.com, dwmw@amazon.co.uk, kirill.shutemov@linux.intel.com Subject: [RFC PATCH v8 07/14] arm64/mm, xpfo: temporarily map dcache regions Date: Wed, 13 Feb 2019 17:01:30 -0700 [thread overview] Message-ID: <ea50404604bdbe1547601b6ea0af89e3da8886b0.1550088114.git.khalid.aziz@oracle.com> (raw) In-Reply-To: <cover.1550088114.git.khalid.aziz@oracle.com> In-Reply-To: <cover.1550088114.git.khalid.aziz@oracle.com> From: Juerg Haefliger <juerg.haefliger@canonical.com> 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. v6: actually flush in the face of xpfo, and temporarily map the underlying memory so it can be flushed correctly CC: linux-arm-kernel@lists.infradead.org Signed-off-by: Juerg Haefliger <juerg.haefliger@canonical.com> Signed-off-by: Tycho Andersen <tycho@docker.com> --- 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 30695a868107..fad09aafd9d5 100644 --- a/arch/arm64/mm/flush.c +++ b/arch/arm64/mm/flush.c @@ -20,6 +20,7 @@ #include <linux/export.h> #include <linux/mm.h> #include <linux/pagemap.h> +#include <linux/xpfo.h> #include <asm/cacheflush.h> #include <asm/cache.h> @@ -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 { flush_icache_range(addr, addr + len); -- 2.17.1 _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
next prev parent reply other threads:[~2019-02-14 0:03 UTC|newest] Thread overview: 64+ messages / expand[flat|nested] mbox.gz Atom feed top 2019-02-14 0:01 [RFC PATCH v8 00/14] Add support for eXclusive Page Frame Ownership Khalid Aziz 2019-02-14 0:01 ` Khalid Aziz 2019-02-14 0:01 ` [RFC PATCH v8 01/14] mm: add MAP_HUGETLB support to vm_mmap Khalid Aziz 2019-02-14 0:01 ` Khalid Aziz 2019-02-14 0:01 ` [RFC PATCH v8 02/14] x86: always set IF before oopsing from page fault Khalid Aziz 2019-02-14 0:01 ` Khalid Aziz 2019-02-14 0:01 ` [RFC PATCH v8 03/14] mm, x86: Add support for eXclusive Page Frame Ownership (XPFO) Khalid Aziz 2019-02-14 0:01 ` Khalid Aziz 2019-02-14 10:56 ` Peter Zijlstra 2019-02-14 10:56 ` Peter Zijlstra 2019-02-14 16:15 ` Borislav Petkov 2019-02-14 16:15 ` Borislav Petkov 2019-02-14 17:19 ` Khalid Aziz 2019-02-14 17:19 ` Khalid Aziz 2019-02-14 17:13 ` Khalid Aziz 2019-02-14 17:13 ` Khalid Aziz 2019-02-14 19:08 ` Peter Zijlstra 2019-02-14 19:08 ` Peter Zijlstra 2019-02-14 19:58 ` Khalid Aziz 2019-02-14 19:58 ` Khalid Aziz 2019-02-14 0:01 ` [RFC PATCH v8 04/14] swiotlb: Map the buffer if it was unmapped by XPFO Khalid Aziz 2019-02-14 0:01 ` Khalid Aziz 2019-02-14 7:47 ` Christoph Hellwig 2019-02-14 7:47 ` Christoph Hellwig 2019-02-14 16:56 ` Khalid Aziz 2019-02-14 16:56 ` Khalid Aziz 2019-02-14 17:44 ` Christoph Hellwig 2019-02-14 17:44 ` Christoph Hellwig 2019-02-14 19:48 ` Khalid Aziz 2019-02-14 19:48 ` Khalid Aziz 2019-02-14 0:01 ` [RFC PATCH v8 05/14] arm64/mm: Add support for XPFO Khalid Aziz 2019-02-14 0:01 ` Khalid Aziz 2019-02-14 0:01 ` [RFC PATCH v8 06/14] xpfo: add primitives for mapping underlying memory Khalid Aziz 2019-02-14 0:01 ` Khalid Aziz 2019-02-14 0:01 ` Khalid Aziz [this message] 2019-02-14 0:01 ` [RFC PATCH v8 07/14] arm64/mm, xpfo: temporarily map dcache regions Khalid Aziz 2019-02-14 15:54 ` Tycho Andersen 2019-02-14 15:54 ` Tycho Andersen 2019-02-14 17:29 ` Khalid Aziz 2019-02-14 17:29 ` Khalid Aziz 2019-02-14 23:49 ` Tycho Andersen 2019-02-14 23:49 ` Tycho Andersen 2019-02-14 0:01 ` [RFC PATCH v8 08/14] arm64/mm: disable section/contiguous mappings if XPFO is enabled Khalid Aziz 2019-02-14 0:01 ` Khalid Aziz 2019-02-15 13:09 ` Mark Rutland 2019-02-15 13:09 ` Mark Rutland 2019-02-15 14:47 ` Khalid Aziz 2019-02-15 14:47 ` Khalid Aziz 2019-02-14 0:01 ` [RFC PATCH v8 09/14] mm: add a user_virt_to_phys symbol Khalid Aziz 2019-02-14 0:01 ` Khalid Aziz 2019-02-14 0:01 ` [RFC PATCH v8 10/14] lkdtm: Add test for XPFO Khalid Aziz 2019-02-14 0:01 ` Khalid Aziz 2019-02-14 0:01 ` [RFC PATCH v8 11/14] xpfo, mm: remove dependency on CONFIG_PAGE_EXTENSION Khalid Aziz 2019-02-14 0:01 ` Khalid Aziz 2019-02-14 0:01 ` [RFC PATCH v8 12/14] xpfo, mm: optimize spinlock usage in xpfo_kunmap Khalid Aziz 2019-02-14 0:01 ` Khalid Aziz 2019-02-14 0:01 ` [RFC PATCH v8 13/14] xpfo, mm: Defer TLB flushes for non-current CPUs (x86 only) Khalid Aziz 2019-02-14 0:01 ` Khalid Aziz 2019-02-14 17:42 ` Dave Hansen 2019-02-14 17:42 ` Dave Hansen 2019-02-14 19:57 ` Khalid Aziz 2019-02-14 19:57 ` Khalid Aziz 2019-02-14 0:01 ` [RFC PATCH v8 14/14] xpfo, mm: Optimize XPFO TLB flushes by batching them together Khalid Aziz 2019-02-14 0:01 ` Khalid Aziz
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