From: ira.weiny@intel.com To: Thomas Gleixner <tglx@linutronix.de>, Ingo Molnar <mingo@redhat.com>, Borislav Petkov <bp@alien8.de>, Andy Lutomirski <luto@kernel.org>, Peter Zijlstra <peterz@infradead.org> Cc: x86@kernel.org, Dave Hansen <dave.hansen@linux.intel.com>, Andrew Morton <akpm@linux-foundation.org>, Fenghua Yu <fenghua.yu@intel.com>, linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, linux-nvdimm@lists.01.org, linux-fsdevel@vger.kernel.org, linux-mm@kvack.org, linux-kselftest@vger.kernel.org Subject: [RFC PATCH 14/15] nvdimm/pmem: Stray write protection for pmem->virt_addr Date: Tue, 14 Jul 2020 00:02:19 -0700 [thread overview] Message-ID: <20200714070220.3500839-15-ira.weiny@intel.com> (raw) In-Reply-To: <20200714070220.3500839-1-ira.weiny@intel.com> From: Ira Weiny <ira.weiny@intel.com> The pmem driver uses a cached virtual address to access its memory directly. Because the nvdimm driver is well aware of the special protections it has mapped memory with, we call dev_access_[en|dis]able() around the direct pmem->virt_addr (pmem_addr) usage instead of the unnecessary overhead of trying to get a page to kmap. Signed-off-by: Ira Weiny <ira.weiny@intel.com> --- drivers/nvdimm/pmem.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/drivers/nvdimm/pmem.c b/drivers/nvdimm/pmem.c index d25e66fd942d..46c11a09b813 100644 --- a/drivers/nvdimm/pmem.c +++ b/drivers/nvdimm/pmem.c @@ -148,7 +148,9 @@ static blk_status_t pmem_do_read(struct pmem_device *pmem, if (unlikely(is_bad_pmem(&pmem->bb, sector, len))) return BLK_STS_IOERR; + dev_access_enable(); rc = read_pmem(page, page_off, pmem_addr, len); + dev_access_disable(); flush_dcache_page(page); return rc; } @@ -180,11 +182,13 @@ static blk_status_t pmem_do_write(struct pmem_device *pmem, * after clear poison. */ flush_dcache_page(page); + dev_access_enable(); write_pmem(pmem_addr, page, page_off, len); if (unlikely(bad_pmem)) { rc = pmem_clear_poison(pmem, pmem_off, len); write_pmem(pmem_addr, page, page_off, len); } + dev_access_disable(); return rc; } -- 2.25.1 _______________________________________________ Linux-nvdimm mailing list -- linux-nvdimm@lists.01.org To unsubscribe send an email to linux-nvdimm-leave@lists.01.org
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From: ira.weiny@intel.com To: Thomas Gleixner <tglx@linutronix.de>, Ingo Molnar <mingo@redhat.com>, Borislav Petkov <bp@alien8.de>, Andy Lutomirski <luto@kernel.org>, Peter Zijlstra <peterz@infradead.org> Cc: Ira Weiny <ira.weiny@intel.com>, x86@kernel.org, Dave Hansen <dave.hansen@linux.intel.com>, Dan Williams <dan.j.williams@intel.com>, Vishal Verma <vishal.l.verma@intel.com>, Andrew Morton <akpm@linux-foundation.org>, Fenghua Yu <fenghua.yu@intel.com>, linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, linux-nvdimm@lists.01.org, linux-fsdevel@vger.kernel.org, linux-mm@kvack.org, linux-kselftest@vger.kernel.org Subject: [RFC PATCH 14/15] nvdimm/pmem: Stray write protection for pmem->virt_addr Date: Tue, 14 Jul 2020 00:02:19 -0700 [thread overview] Message-ID: <20200714070220.3500839-15-ira.weiny@intel.com> (raw) In-Reply-To: <20200714070220.3500839-1-ira.weiny@intel.com> From: Ira Weiny <ira.weiny@intel.com> The pmem driver uses a cached virtual address to access its memory directly. Because the nvdimm driver is well aware of the special protections it has mapped memory with, we call dev_access_[en|dis]able() around the direct pmem->virt_addr (pmem_addr) usage instead of the unnecessary overhead of trying to get a page to kmap. Signed-off-by: Ira Weiny <ira.weiny@intel.com> --- drivers/nvdimm/pmem.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/drivers/nvdimm/pmem.c b/drivers/nvdimm/pmem.c index d25e66fd942d..46c11a09b813 100644 --- a/drivers/nvdimm/pmem.c +++ b/drivers/nvdimm/pmem.c @@ -148,7 +148,9 @@ static blk_status_t pmem_do_read(struct pmem_device *pmem, if (unlikely(is_bad_pmem(&pmem->bb, sector, len))) return BLK_STS_IOERR; + dev_access_enable(); rc = read_pmem(page, page_off, pmem_addr, len); + dev_access_disable(); flush_dcache_page(page); return rc; } @@ -180,11 +182,13 @@ static blk_status_t pmem_do_write(struct pmem_device *pmem, * after clear poison. */ flush_dcache_page(page); + dev_access_enable(); write_pmem(pmem_addr, page, page_off, len); if (unlikely(bad_pmem)) { rc = pmem_clear_poison(pmem, pmem_off, len); write_pmem(pmem_addr, page, page_off, len); } + dev_access_disable(); return rc; } -- 2.25.1
next prev parent reply other threads:[~2020-07-14 7:04 UTC|newest] Thread overview: 62+ messages / expand[flat|nested] mbox.gz Atom feed top 2020-07-14 7:02 [RFC PATCH 00/15] PKS: Add Protection Keys Supervisor (PKS) support ira.weiny 2020-07-14 7:02 ` ira.weiny 2020-07-14 7:02 ` [RFC PATCH 01/15] x86/pkeys: Create pkeys_internal.h ira.weiny 2020-07-14 7:02 ` ira.weiny 2020-07-14 7:02 ` [RFC PATCH 02/15] x86/fpu: Refactor arch_set_user_pkey_access() for PKS support ira.weiny 2020-07-14 7:02 ` ira.weiny 2020-07-14 7:02 ` [RFC PATCH 03/15] x86/pks: Enable Protection Keys Supervisor (PKS) ira.weiny 2020-07-14 7:02 ` ira.weiny 2020-07-14 7:02 ` [RFC PATCH 04/15] x86/pks: Preserve the PKRS MSR on context switch ira.weiny 2020-07-14 7:02 ` ira.weiny 2020-07-14 8:27 ` Peter Zijlstra 2020-07-14 8:27 ` Peter Zijlstra 2020-07-14 18:53 ` Ira Weiny 2020-07-14 18:53 ` Ira Weiny 2020-07-14 18:56 ` Dave Hansen 2020-07-14 18:56 ` Dave Hansen 2020-07-14 19:05 ` Peter Zijlstra 2020-07-14 19:05 ` Peter Zijlstra 2020-07-14 19:09 ` Ira Weiny 2020-07-14 19:09 ` Ira Weiny 2020-07-16 8:37 ` [x86/pks] 061e3e0b92: leaking-addresses.dmesg.uncheckedMSRaccesserror:WRMSRto0x6e1(triedtowrite0x0000000055555554)atrIP:(write_pkrs+0x15/0x2b) kernel test robot 2020-07-16 8:37 ` kernel test robot 2020-07-14 7:02 ` [RFC PATCH 05/15] x86/pks: Add PKS kernel API ira.weiny 2020-07-14 7:02 ` ira.weiny 2020-07-14 7:02 ` [RFC PATCH 06/15] x86/pks: Add a debugfs file for allocated PKS keys ira.weiny 2020-07-14 7:02 ` ira.weiny 2020-07-14 7:02 ` [RFC PATCH 07/15] Documentation/pkeys: Update documentation for kernel pkeys ira.weiny 2020-07-14 7:02 ` ira.weiny 2020-07-14 7:02 ` [RFC PATCH 08/15] x86/pks: Add PKS Test code ira.weiny 2020-07-14 7:02 ` ira.weiny 2020-07-14 7:02 ` [RFC PATCH 09/15] fs/dax: Remove unused size parameter ira.weiny 2020-07-14 7:02 ` ira.weiny 2020-07-14 7:02 ` [RFC PATCH 10/15] drivers/dax: Expand lock scope to cover the use of addresses ira.weiny 2020-07-14 7:02 ` ira.weiny 2020-07-14 7:02 ` [RFC PATCH 11/15] memremap: Add zone device access protection ira.weiny 2020-07-14 7:02 ` ira.weiny 2020-07-14 8:40 ` Peter Zijlstra 2020-07-14 8:40 ` Peter Zijlstra 2020-07-14 19:10 ` Ira Weiny 2020-07-14 19:10 ` Ira Weiny 2020-07-14 19:40 ` Peter Zijlstra 2020-07-14 19:40 ` Peter Zijlstra 2020-07-14 7:02 ` [RFC PATCH 12/15] kmap: Add stray write protection for device pages ira.weiny 2020-07-14 7:02 ` ira.weiny 2020-07-14 8:44 ` Peter Zijlstra 2020-07-14 8:44 ` Peter Zijlstra 2020-07-14 19:06 ` Ira Weiny 2020-07-14 19:06 ` Ira Weiny 2020-07-14 19:29 ` Peter Zijlstra 2020-07-14 19:29 ` Peter Zijlstra 2020-07-14 19:42 ` Dave Hansen 2020-07-14 19:42 ` Dave Hansen 2020-07-14 19:49 ` Peter Zijlstra 2020-07-14 19:49 ` Peter Zijlstra 2020-07-14 20:00 ` Ira Weiny 2020-07-14 20:00 ` Ira Weiny 2020-07-14 7:02 ` [RFC PATCH 13/15] dax: Stray write protection for dax_direct_access() ira.weiny 2020-07-14 7:02 ` ira.weiny 2020-07-14 7:02 ` ira.weiny [this message] 2020-07-14 7:02 ` [RFC PATCH 14/15] nvdimm/pmem: Stray write protection for pmem->virt_addr ira.weiny 2020-07-14 7:02 ` [RFC PATCH 15/15] [dax|pmem]: Enable stray write protection ira.weiny 2020-07-14 7:02 ` ira.weiny
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