| Message ID | c0b53c74379e6d654bbe42471fcef8aa5fd22efd.1534934405.git.yi.z.zhang@linux.intel.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | Fix kvm misconceives NVDIMM pages as reserved mmio | expand |
> > 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 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, > }; > > /* > -- Reviewed-by: Pankaj Gupta <pagupta@redhat.com> > 2.7.4 > >
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, }; /*