When creating a new namespace, the kernel needs to make sure namespace size and
start address are correctly aligned to SUBSECTION_SIZE. This ensures kernel can
enable/disable namespace without conflicting with memory hotplug rules. Without
this,
a namespace that partially covers a SUBSECTION can prevent the creation of an
adjacent namespace because the hotplug subsystem will find the subsection
already active.
To make sure new kernel don't break an existing install with an unaligned
start/size attribute,
while initializing the namespace the kernel validates these attribute against
direct-map
mapping page size rather than subsection size.
Aneesh Kumar K.V (6):
libnvdimm/namespace: Make namespace size validation arch dependent
libnvdimm/namespace: Validate namespace start addr and size
libnvdimm/namespace: Add arch dependent callback for namespace create
time validation
libnvdimm/namespace: Validate namespace size when creating a new
namespace.
libnvdimm/namespace: Align DPA based on arch restrictions
libnvdimm/namespace: Expose arch specific supported size align value
arch/arm64/mm/flush.c | 13 +++++
arch/powerpc/lib/pmem.c | 20 ++++++++
arch/x86/mm/pageattr.c | 13 +++++
drivers/nvdimm/namespace_devs.c | 85 +++++++++++++++++++++++++++++++--
include/linux/libnvdimm.h | 2 +
5 files changed, 128 insertions(+), 5 deletions(-)
--
2.24.1
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