From: Zhang Yi <yi.z.zhang@linux.intel.com> To: kvm@vger.kernel.org, linux-kernel@vger.kernel.org, linux-nvdimm@lists.01.org, pbonzini@redhat.com, dan.j.williams@intel.com, dave.jiang@intel.com, yu.c.zhang@intel.com, pagupta@redhat.com, david@redhat.com, jack@suse.cz, hch@lst.de Cc: linux-mm@kvack.org, jglisse@redhat.com, yi.z.zhang@intel.com, rkrcmar@redhat.com Subject: [PATCH V5 2/4] mm: introduce memory type MEMORY_DEVICE_DEV_DAX Date: Sat, 8 Sep 2018 02:03:39 +0800 [thread overview] Message-ID: <c0b53c74379e6d654bbe42471fcef8aa5fd22efd.1536342881.git.yi.z.zhang@linux.intel.com> (raw) In-Reply-To: <cover.1536342881.git.yi.z.zhang@linux.intel.com> Currently, NVDIMM pages will be marked 'PageReserved'. However, unlike other reserved PFNs, pages on NVDIMM shall still behave like normal ones in many cases, i.e. when used as backend memory of KVM guest. This patch introduces a new memory type, MEMORY_DEVICE_DEV_DAX. And set this flag while dax driver hotplug the device memory. Signed-off-by: Zhang Yi <yi.z.zhang@linux.intel.com> Signed-off-by: Zhang Yu <yu.c.zhang@linux.intel.com> Reviewed-by: Jan Kara <jack@suse.cz> --- drivers/dax/pmem.c | 1 + include/linux/memremap.h | 8 ++++++++ 2 files changed, 9 insertions(+) diff --git a/drivers/dax/pmem.c b/drivers/dax/pmem.c index fd49b24..fb3f363 100644 --- a/drivers/dax/pmem.c +++ b/drivers/dax/pmem.c @@ -111,6 +111,7 @@ static int dax_pmem_probe(struct device *dev) return rc; dax_pmem->pgmap.ref = &dax_pmem->ref; + dax_pmem->pgmap.type = MEMORY_DEVICE_DEV_DAX; addr = devm_memremap_pages(dev, &dax_pmem->pgmap); if (IS_ERR(addr)) return PTR_ERR(addr); diff --git a/include/linux/memremap.h b/include/linux/memremap.h index f91f9e7..cd07ca8 100644 --- a/include/linux/memremap.h +++ b/include/linux/memremap.h @@ -53,11 +53,19 @@ struct vmem_altmap { * wakeup event whenever a page is unpinned and becomes idle. This * wakeup is used to coordinate physical address space management (ex: * fs truncate/hole punch) vs pinned pages (ex: device dma). + * + * MEMORY_DEVICE_DEV_DAX: + * Device memory that support raw access to persistent memory. Without need + * of an intervening filesystem, it could be directed mapped via an mmap + * capable character device. Together with the type MEMORY_DEVICE_FS_DAX, + * we could distinguish the persistent memory pages from normal ZONE_DEVICE + * pages. */ enum memory_type { MEMORY_DEVICE_PRIVATE = 1, MEMORY_DEVICE_PUBLIC, MEMORY_DEVICE_FS_DAX, + MEMORY_DEVICE_DEV_DAX, }; /* -- 2.7.4 _______________________________________________ Linux-nvdimm mailing list Linux-nvdimm@lists.01.org https://lists.01.org/mailman/listinfo/linux-nvdimm
WARNING: multiple messages have this Message-ID (diff)
From: Zhang Yi <yi.z.zhang@linux.intel.com> To: kvm@vger.kernel.org, linux-kernel@vger.kernel.org, linux-nvdimm@lists.01.org, pbonzini@redhat.com, dan.j.williams@intel.com, dave.jiang@intel.com, yu.c.zhang@intel.com, pagupta@redhat.com, david@redhat.com, jack@suse.cz, hch@lst.de Cc: linux-mm@kvack.org, rkrcmar@redhat.com, jglisse@redhat.com, yi.z.zhang@intel.com, Zhang Yi <yi.z.zhang@linux.intel.com> Subject: [PATCH V5 2/4] mm: introduce memory type MEMORY_DEVICE_DEV_DAX Date: Sat, 8 Sep 2018 02:03:39 +0800 [thread overview] Message-ID: <c0b53c74379e6d654bbe42471fcef8aa5fd22efd.1536342881.git.yi.z.zhang@linux.intel.com> (raw) In-Reply-To: <cover.1536342881.git.yi.z.zhang@linux.intel.com> Currently, NVDIMM pages will be marked 'PageReserved'. However, unlike other reserved PFNs, pages on NVDIMM shall still behave like normal ones in many cases, i.e. when used as backend memory of KVM guest. This patch introduces a new memory type, MEMORY_DEVICE_DEV_DAX. And set this flag while dax driver hotplug the device memory. Signed-off-by: Zhang Yi <yi.z.zhang@linux.intel.com> Signed-off-by: Zhang Yu <yu.c.zhang@linux.intel.com> Reviewed-by: Jan Kara <jack@suse.cz> --- drivers/dax/pmem.c | 1 + include/linux/memremap.h | 8 ++++++++ 2 files changed, 9 insertions(+) diff --git a/drivers/dax/pmem.c b/drivers/dax/pmem.c index fd49b24..fb3f363 100644 --- a/drivers/dax/pmem.c +++ b/drivers/dax/pmem.c @@ -111,6 +111,7 @@ static int dax_pmem_probe(struct device *dev) return rc; dax_pmem->pgmap.ref = &dax_pmem->ref; + dax_pmem->pgmap.type = MEMORY_DEVICE_DEV_DAX; addr = devm_memremap_pages(dev, &dax_pmem->pgmap); if (IS_ERR(addr)) return PTR_ERR(addr); diff --git a/include/linux/memremap.h b/include/linux/memremap.h index f91f9e7..cd07ca8 100644 --- a/include/linux/memremap.h +++ b/include/linux/memremap.h @@ -53,11 +53,19 @@ struct vmem_altmap { * wakeup event whenever a page is unpinned and becomes idle. This * wakeup is used to coordinate physical address space management (ex: * fs truncate/hole punch) vs pinned pages (ex: device dma). + * + * MEMORY_DEVICE_DEV_DAX: + * Device memory that support raw access to persistent memory. Without need + * of an intervening filesystem, it could be directed mapped via an mmap + * capable character device. Together with the type MEMORY_DEVICE_FS_DAX, + * we could distinguish the persistent memory pages from normal ZONE_DEVICE + * pages. */ enum memory_type { MEMORY_DEVICE_PRIVATE = 1, MEMORY_DEVICE_PUBLIC, MEMORY_DEVICE_FS_DAX, + MEMORY_DEVICE_DEV_DAX, }; /* -- 2.7.4
next prev parent reply other threads:[~2018-09-07 9:24 UTC|newest] Thread overview: 48+ messages / expand[flat|nested] mbox.gz Atom feed top 2018-09-07 18:03 [PATCH V5 0/4] Fix kvm misconceives NVDIMM pages as reserved mmio Zhang Yi 2018-09-07 18:03 ` Zhang Yi 2018-09-07 18:03 ` Zhang Yi 2018-09-07 17:04 ` Ahmed S. Darwish 2018-09-07 17:04 ` Ahmed S. Darwish 2018-09-07 17:04 ` Ahmed S. Darwish 2018-09-18 14:31 ` Yi Zhang 2018-09-18 14:31 ` Yi Zhang 2018-09-18 14:31 ` Yi Zhang 2018-09-07 18:03 ` [PATCH V5 1/4] kvm: remove redundant reserved page check Zhang Yi 2018-09-07 18:03 ` Zhang Yi 2018-09-07 18:03 ` Zhang Yi 2018-10-24 14:32 ` Yi Zhang 2018-09-07 18:03 ` Zhang Yi [this message] 2018-09-07 18:03 ` [PATCH V5 2/4] mm: introduce memory type MEMORY_DEVICE_DEV_DAX Zhang Yi 2018-09-07 18:03 ` [PATCH V5 3/4] mm: add a function to differentiate the pages is from DAX device memory Zhang Yi 2018-09-07 18:03 ` Zhang Yi 2018-09-07 18:03 ` Zhang Yi 2018-09-07 18:04 ` [PATCH V5 4/4] kvm: add a check if pfn is from NVDIMM pmem Zhang Yi 2018-09-07 18:04 ` Zhang Yi 2018-09-19 2:53 ` Dan Williams 2018-09-19 2:53 ` Dan Williams 2018-09-19 7:20 ` David Hildenbrand 2018-09-19 7:20 ` David Hildenbrand 2018-09-20 22:49 ` Yi Zhang 2018-09-20 22:49 ` Yi Zhang 2018-09-20 21:19 ` Dan Williams 2018-09-21 22:47 ` Yi Zhang 2018-09-21 14:23 ` David Hildenbrand 2018-09-21 14:23 ` David Hildenbrand 2018-09-21 18:17 ` Dan Williams 2018-09-21 18:17 ` Dan Williams 2018-09-21 18:17 ` Dan Williams 2018-09-21 19:29 ` David Hildenbrand 2018-09-21 19:29 ` David Hildenbrand 2018-09-21 19:29 ` David Hildenbrand 2018-10-19 16:33 ` Barret Rhoden 2018-10-19 16:33 ` Barret Rhoden 2018-10-19 16:33 ` Barret Rhoden 2018-10-22 8:47 ` Yi Zhang 2018-10-22 8:47 ` Yi Zhang 2018-10-22 8:47 ` Yi Zhang 2018-10-22 8:47 ` Yi Zhang 2018-09-19 10:55 ` [PATCH V5 0/4] Fix kvm misconceives NVDIMM pages as reserved mmio Yi Zhang 2018-09-19 10:55 ` Yi Zhang 2018-09-19 10:55 ` Yi Zhang 2018-09-19 2:43 ` Pankaj Gupta 2018-09-19 2:43 ` Pankaj Gupta
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