| lists.openwall.net | lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC | |
|
Open Source and information security mailing list archives
| ||
|
Date: Mon, 05 Oct 2020 23:54:44 -0700
From: Dan Williams <dan.j.williams@...el.com>
To: akpm@...ux-foundation.org
Cc: David Hildenbrand <david@...hat.com>,
Ira Weiny <ira.weiny@...el.com>,
Bjorn Helgaas <bhelgaas@...gle.com>,
Vishal Verma <vishal.l.verma@...el.com>,
Dave Hansen <dave.hansen@...ux.intel.com>,
David Airlie <airlied@...ux.ie>,
Vivek Goyal <vgoyal@...hat.com>,
Joao Martins <joao.m.martins@...cle.com>,
Dave Jiang <dave.jiang@...el.com>,
Jonathan Cameron <Jonathan.Cameron@...wei.com>,
Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
Pavel Tatashin <pasha.tatashin@...een.com>,
Hulk Robot <hulkci@...wei.com>,
Ben Skeggs <bskeggs@...hat.com>,
Benjamin Herrenschmidt <benh@...nel.crashing.org>,
Jia He <justin.he@....com>,
Jérôme Glisse <jglisse@...hat.com>,
Jason Yan <yanaijie@...wei.com>,
Paul Mackerras <paulus@...abs.org>,
Boris Ostrovsky <boris.ostrovsky@...cle.com>,
Brice Goglin <Brice.Goglin@...ia.fr>,
Stefano Stabellini <sstabellini@...nel.org>,
Michael Ellerman <mpe@...erman.id.au>,
Dan Carpenter <dan.carpenter@...cle.com>,
Juergen Gross <jgross@...e.com>,
Daniel Vetter <daniel@...ll.ch>, linux-mm@...ck.org,
linux-kernel@...r.kernel.org, linux-nvdimm@...ts.01.org,
david@...hat.com, joao.m.martins@...cle.com
Subject: [PATCH v6 00/11] device-dax: support sub-dividing soft-reserved
ranges
Changes since v5 [1]:
- (David) Introduce range_len() to include/linux/range.h immediately in
"device-dax: make pgmap optional for instance creation" rather than
wait until "mm/memremap_pages: convert to 'struct range'" to move it.
- (David) David points out that release_mem_region() can not be used in
the kmem driver since it depends on the resource range being busy at
free. The dance the driver does to hand-off busy/free management to
add_memory_driver_managed() breaks request_mem_region()'s assumptions
and requires the driver to continue to use a open-coded
release_resource() + kfree() sequence. For the new multi-range case,
expand the driver-data to hold all the resulting 'struct resource'
instances from mapping the ranges.
- (Boris) consolidate pgmap manipulation code in the
xen_alloc_unpopulated_pages() path. Since this touched
"mm/memremap_pages: convert to 'struct range'" with the pending fix from
Dan, I folded in that fix and gave him a Reported-by credit.
[1]: http://lore.kernel.org/r/160106109960.30709.7379926726669669398.stgit@dwillia2-desk3.amr.corp.intel.com
---
Hi Andrew,
As before patches that are in your tree and did not change as a result
of these updates are not re-sent. This set replaces:
device-dax-make-pgmap-optional-for-instance-creation.patch
...through...
device-dax-add-dis-contiguous-resource-support.patch
...in your stack.
I let this soak over the weekend in kbuild-robot visible tree and it
received a build success notification over 160 configs, and no other
regression notices.
---
The device-dax facility allows an address range to be directly mapped
through a chardev, or optionally hotplugged to the core kernel page
allocator as System-RAM. It is the mechanism for converting persistent
memory (pmem) to be used as another volatile memory pool i.e. the
current Memory Tiering hot topic on linux-mm.
In the case of pmem the nvdimm-namespace-label mechanism can sub-divide
it, but that labeling mechanism is not available / applicable to
soft-reserved ("EFI specific purpose") memory [2]. This series provides
a sysfs-mechanism for the daxctl utility to enable provisioning of
volatile-soft-reserved memory ranges.
The motivations for this facility are:
1/ Allow performance differentiated memory ranges to be split between
kernel-managed and directly-accessed use cases.
2/ Allow physical memory to be provisioned along performance relevant
address boundaries. For example, divide a memory-side cache [3] along
cache-color boundaries.
3/ Parcel out soft-reserved memory to VMs using device-dax as a security
/ permissions boundary [4]. Specifically I have seen people (ab)using
memmap=nn!ss (mark System-RAM as Persistent Memory) just to get the
device-dax interface on custom address ranges. A follow-on for the VM
use case is to teach device-dax to dynamically allocate 'struct page' at
runtime to reduce the duplication of 'struct page' space in both the
guest and the host kernel for the same physical pages.
[2]: http://lore.kernel.org/r/157309097008.1579826.12818463304589384434.stgit@dwillia2-desk3.amr.corp.intel.com
[3]: http://lore.kernel.org/r/154899811738.3165233.12325692939590944259.stgit@dwillia2-desk3.amr.corp.intel.com
[4]: http://lore.kernel.org/r/20200110190313.17144-1-joao.m.martins@oracle.com
---
Dan Williams (11):
device-dax: make pgmap optional for instance creation
device-dax/kmem: introduce dax_kmem_range()
device-dax/kmem: move resource tracking to drvdata
device-dax: add an allocation interface for device-dax instances
device-dax: introduce 'struct dev_dax' typed-driver operations
device-dax: introduce 'seed' devices
drivers/base: make device_find_child_by_name() compatible with sysfs inputs
device-dax: add resize support
mm/memremap_pages: convert to 'struct range'
mm/memremap_pages: support multiple ranges per invocation
device-dax: add dis-contiguous resource support
arch/powerpc/kvm/book3s_hv_uvmem.c | 14 -
drivers/base/core.c | 2
drivers/dax/bus.c | 708 ++++++++++++++++++++++++++++++--
drivers/dax/bus.h | 11
drivers/dax/dax-private.h | 23 +
drivers/dax/device.c | 71 ++-
drivers/dax/hmem/hmem.c | 14 -
drivers/dax/kmem.c | 198 ++++++---
drivers/dax/pmem/compat.c | 2
drivers/dax/pmem/core.c | 14 -
drivers/gpu/drm/nouveau/nouveau_dmem.c | 15 -
drivers/nvdimm/badrange.c | 26 +
drivers/nvdimm/claim.c | 13 -
drivers/nvdimm/nd.h | 3
drivers/nvdimm/pfn_devs.c | 13 -
drivers/nvdimm/pmem.c | 27 +
drivers/nvdimm/region.c | 21 +
drivers/pci/p2pdma.c | 12 -
drivers/xen/unpopulated-alloc.c | 49 +-
include/linux/memremap.h | 11
include/linux/range.h | 6
lib/test_hmm.c | 51 +-
mm/memremap.c | 299 ++++++++------
tools/testing/nvdimm/dax-dev.c | 22 +
tools/testing/nvdimm/test/iomap.c | 2
25 files changed, 1216 insertions(+), 411 deletions(-)
base-commit: d524ed85683d657593ac1e58098407bed0601a84
Powered by blists - more mailing lists