account linux-nvdimm@lists.01.org is compromised
by linux-nvdimm＠lists.01.org
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Farewell.
1 year, 12 months
[GIT PULL] libnvdimm for 4.20
by Williams, Dan J
Hi Linus, please pull from:
git://git.kernel.org/pub/scm/linux/kernel/git/nvdimm/nvdimm tags/libnvdimm-for-4.20
...to receive the libnvdimm updates for this cycle. No interactions
with other trees this time around. There are updates to the core to
improve driver initialization time, and updates to the 'nfit' driver
for fixing ARS corner cases and exposing some more hardware attributes
to userspace. It has all been in -next for a few releases now with no
reported issues.
---
The following changes since commit 7876320f88802b22d4e2daf7eb027dd14175a0f8:
Linux 4.19-rc4 (2018-09-16 11:52:37 -0700)
are available in the Git repository at:
git://git.kernel.org/pub/scm/linux/kernel/git/nvdimm/nvdimm tags/libnvdimm-for-4.20
for you to fetch changes up to 594861215c834e4b59a30d4b794f6372717bc197:
acpi, nfit: Further restrict userspace ARS start requests (2018-10-17 14:02:32 -0700)
----------------------------------------------------------------
libnvdimm for 4.20
* Improve the efficiency and performance of reading nvdimm-namespace
labels. Reduce the amount of label data read at driver load time by a
few orders of magnitude. Reduce heavyweight call-outs to
platform-firmware routines.
* Handle media errors located in the 'struct page' array stored on a
persistent memory namespace. Let the kernel clear these errors rather
than an awkward userspace workaround.
* Fix Address Range Scrub (ARS) completion tracking. Correct occasions
where the kernel indicates completion of ARS before submission.
* Fix asynchronous device registration reference counting.
* Add support for reporting an nvdimm dirty-shutdown-count via sysfs.
* Fix various small libnvdimm core and uapi issues.
----------------------------------------------------------------
Alexander Duyck (7):
libnvdimm: Hold reference on parent while scheduling async init
libnvdimm: Set device node in nd_device_register
nvdimm: Sanity check labeloff
nvdimm: Clarify comment in sizeof_namespace_index
nvdimm: Remove empty if statement
nvdimm: Split label init out from the logic for getting config data
nvdimm: Use namespace index data to reduce number of label reads needed
Dan Williams (9):
libnvdimm, region: Fail badblocks listing for inactive regions
libnvdimm, pmem: Fix badblocks population for 'raw' namespaces
libnvdimm, dimm: Maximize label transfer size
libnvdimm, label: Fix sparse warning
acpi, nfit: Introduce nfit_mem flags
acpi, nfit: Collect shutdown status
tools/testing/nvdimm: Populate dirty shutdown data
acpi, nfit: Fix Address Range Scrub completion tracking
acpi, nfit: Further restrict userspace ARS start requests
David Howells (2):
UAPI: ndctl: Fix g++-unsupported initialisation in headers
UAPI: ndctl: Remove use of PAGE_SIZE
GuangZhe Fu (1):
libnvdimm, namespace: Drop the repeat assignment for variable dev->parent
Pankaj Gupta (1):
libnvdimm: remove duplicate include
Vishal Verma (1):
libnvdimm, pfn: during init, clear errors in the metadata area
drivers/acpi/nfit/core.c | 297 +++++++++++++++++++++++-----------
drivers/acpi/nfit/intel.h | 38 +++++
drivers/acpi/nfit/nfit.h | 21 ++-
drivers/nvdimm/bus.c | 20 ++-
drivers/nvdimm/dimm.c | 6 +-
drivers/nvdimm/dimm_devs.c | 60 +++----
drivers/nvdimm/label.c | 144 ++++++++++++++++-
drivers/nvdimm/label.h | 4 +-
drivers/nvdimm/namespace_devs.c | 1 -
drivers/nvdimm/nd-core.h | 1 -
drivers/nvdimm/nd.h | 2 +
drivers/nvdimm/pfn_devs.c | 61 ++++++-
drivers/nvdimm/pmem.c | 4 +-
drivers/nvdimm/region_devs.c | 11 +-
include/linux/ndctl.h | 22 +++
include/uapi/linux/ndctl.h | 52 +++---
tools/testing/nvdimm/Kbuild | 1 +
tools/testing/nvdimm/acpi_nfit_test.c | 8 +
tools/testing/nvdimm/test/nfit.c | 4 +-
tools/testing/nvdimm/test/nfit_test.h | 24 ---
20 files changed, 564 insertions(+), 217 deletions(-)
create mode 100644 drivers/acpi/nfit/intel.h
create mode 100644 include/linux/ndctl.h
2 years
[PATCH V5 0/4] Fix kvm misconceives NVDIMM pages as reserved mmio
by Zhang Yi
For device specific memory space, when we move these area of pfn to
memory zone, we will set the page reserved flag at that time, some of
these reserved for device mmio, and some of these are not, such as
NVDIMM pmem.
Now, we map these dev_dax or fs_dax pages to kvm for DIMM/NVDIMM
backend, since these pages are reserved. the check of
kvm_is_reserved_pfn() misconceives those pages as MMIO. Therefor, we
introduce 2 page map types, MEMORY_DEVICE_FS_DAX/MEMORY_DEVICE_DEV_DAX,
to indentify these pages are from NVDIMM pmem. and let kvm treat these
as normal pages.
Without this patch, Many operations will be missed due to this
mistreatment to pmem pages. For example, a page may not have chance to
be unpinned for KVM guest(in kvm_release_pfn_clean); not able to be
marked as dirty/accessed(in kvm_set_pfn_dirty/accessed) etc.
V1:
https://lkml.org/lkml/2018/7/4/91
V2:
https://lkml.org/lkml/2018/7/10/135
V3:
https://lkml.org/lkml/2018/8/9/17
V4:
https://lkml.org/lkml/2018/8/22/17
V5:
[PATCH V3 1/4] Reviewed-by: David / Acked-by: Pankaj
[PATCH V3 2/4] Reviewed-by: Jan
[PATCH V3 3/4] Acked-by: Jan
[PATCH V3 4/4] Added "Acked-by: Pankaj", Added in-line comments: Dave
Zhang Yi (4):
kvm: remove redundant reserved page check
mm: introduce memory type MEMORY_DEVICE_DEV_DAX
mm: add a function to differentiate the pages is from DAX device
memory
kvm: add a check if pfn is from NVDIMM pmem.
drivers/dax/pmem.c | 1 +
include/linux/memremap.h | 8 ++++++++
include/linux/mm.h | 12 ++++++++++++
virt/kvm/kvm_main.c | 24 ++++++++++++++++--------
4 files changed, 37 insertions(+), 8 deletions(-)
--
2.7.4
2 years
Re: [RFC v1 00/31] kunit: Introducing KUnit, the Linux kernel unit testing framework
by Dan Williams
On Tue, Oct 16, 2018 at 4:54 PM Brendan Higgins
<brendanhiggins(a)google.com> wrote:
>
> This patch set proposes KUnit, a lightweight unit testing and mocking
> framework for the Linux kernel.
>
> Unlike Autotest and kselftest, KUnit is a true unit testing framework;
> it does not require installing the kernel on a test machine or in a VM
> and does not require tests to be written in userspace running on a host
> kernel. Additionally, KUnit is fast: From invocation to completion KUnit
> can run several dozen tests in under a second. Currently, the entire
> KUnit test suite for KUnit runs in under a second from the initial
> invocation (build time excluded).
>
> KUnit is heavily inspired by JUnit, Python's unittest.mock, and
> Googletest/Googlemock for C++. KUnit provides facilities for defining
> unit test cases, grouping related test cases into test suites, providing
> common infrastructure for running tests, mocking, spying, and much more.
>
> ## What's so special about unit testing?
>
> A unit test is supposed to test a single unit of code in isolation,
> hence the name. There should be no dependencies outside the control of
> the test; this means no external dependencies, which makes tests orders
> of magnitudes faster. Likewise, since there are no external dependencies,
> there are no hoops to jump through to run the tests. Additionally, this
> makes unit tests deterministic: a failing unit test always indicates a
> problem. Finally, because unit tests necessarily have finer granularity,
> they are able to test all code paths easily solving the classic problem
> of difficulty in exercising error handling code.
>
> ## Is KUnit trying to replace other testing frameworks for the kernel?
>
> No. Most existing tests for the Linux kernel are end-to-end tests, which
> have their place. A well tested system has lots of unit tests, a
> reasonable number of integration tests, and some end-to-end tests. KUnit
> is just trying to address the unit test space which is currently not
> being addressed.
>
> ## More information on KUnit
>
> There is a bunch of documentation near the end of this patch set that
> describes how to use KUnit and best practices for writing unit tests.
> For convenience I am hosting the compiled docs here:
> https://google.github.io/kunit-docs/third_party/kernel/docs/
Nice! I've been using mocking techniques in kernel code for the
libnvdimm test infrastructure in tools/testing/nvdimm/. It's part unit
test infrastructure, part emulation, and I've always had the feeling
it's all a bit too adhoc. I'm going to take a look and see what can be
converted to kunit. Please include linux-nvdimm(a)lists.01.org on future
postings.
I'll shamelessly plug my lwn article about unit testing
https://lwn.net/Articles/654071/ because it's always good to find
fellow co-travelers to compare notes and advocate for more test
oriented kernel development.
2 years
[PATCH v3 1/2] powerpc/pseries: PAPR persistent memory support
by Oliver O'Halloran
This patch implements support for discovering storage class memory
devices at boot and for handling hotplug of new regions via RTAS
hotplug events.
Signed-off-by: Oliver O'Halloran <oohall(a)gmail.com>
---
v2: Added missing pmem.c
v3: no changes
---
arch/powerpc/include/asm/firmware.h | 3 +-
arch/powerpc/include/asm/hvcall.h | 10 +-
arch/powerpc/include/asm/rtas.h | 2 +
arch/powerpc/kernel/rtasd.c | 2 +
arch/powerpc/platforms/pseries/Makefile | 2 +-
arch/powerpc/platforms/pseries/dlpar.c | 4 +
arch/powerpc/platforms/pseries/firmware.c | 1 +
arch/powerpc/platforms/pseries/pmem.c | 164 ++++++++++++++++++++++++++++++
arch/powerpc/platforms/pseries/pseries.h | 5 +
arch/powerpc/platforms/pseries/ras.c | 3 +-
10 files changed, 192 insertions(+), 4 deletions(-)
create mode 100644 arch/powerpc/platforms/pseries/pmem.c
diff --git a/arch/powerpc/include/asm/firmware.h b/arch/powerpc/include/asm/firmware.h
index 7a051bd21f87..113c64d5d394 100644
--- a/arch/powerpc/include/asm/firmware.h
+++ b/arch/powerpc/include/asm/firmware.h
@@ -52,6 +52,7 @@
#define FW_FEATURE_PRRN ASM_CONST(0x0000000200000000)
#define FW_FEATURE_DRMEM_V2 ASM_CONST(0x0000000400000000)
#define FW_FEATURE_DRC_INFO ASM_CONST(0x0000000800000000)
+#define FW_FEATURE_PAPR_SCM ASM_CONST(0x0000001000000000)
#ifndef __ASSEMBLY__
@@ -69,7 +70,7 @@ enum {
FW_FEATURE_SET_MODE | FW_FEATURE_BEST_ENERGY |
FW_FEATURE_TYPE1_AFFINITY | FW_FEATURE_PRRN |
FW_FEATURE_HPT_RESIZE | FW_FEATURE_DRMEM_V2 |
- FW_FEATURE_DRC_INFO,
+ FW_FEATURE_DRC_INFO | FW_FEATURE_PAPR_SCM,
FW_FEATURE_PSERIES_ALWAYS = 0,
FW_FEATURE_POWERNV_POSSIBLE = FW_FEATURE_OPAL,
FW_FEATURE_POWERNV_ALWAYS = 0,
diff --git a/arch/powerpc/include/asm/hvcall.h b/arch/powerpc/include/asm/hvcall.h
index a0b17f9f1ea4..0e81ef83b35a 100644
--- a/arch/powerpc/include/asm/hvcall.h
+++ b/arch/powerpc/include/asm/hvcall.h
@@ -295,7 +295,15 @@
#define H_INT_ESB 0x3C8
#define H_INT_SYNC 0x3CC
#define H_INT_RESET 0x3D0
-#define MAX_HCALL_OPCODE H_INT_RESET
+#define H_SCM_READ_METADATA 0x3E4
+#define H_SCM_WRITE_METADATA 0x3E8
+#define H_SCM_BIND_MEM 0x3EC
+#define H_SCM_UNBIND_MEM 0x3F0
+#define H_SCM_QUERY_BLOCK_MEM_BINDING 0x3F4
+#define H_SCM_QUERY_LOGICAL_MEM_BINDING 0x3F8
+#define H_SCM_MEM_QUERY 0x3FC
+#define H_SCM_BLOCK_CLEAR 0x400
+#define MAX_HCALL_OPCODE H_SCM_BLOCK_CLEAR
/* H_VIOCTL functions */
#define H_GET_VIOA_DUMP_SIZE 0x01
diff --git a/arch/powerpc/include/asm/rtas.h b/arch/powerpc/include/asm/rtas.h
index 71e393c46a49..1e81f3d55457 100644
--- a/arch/powerpc/include/asm/rtas.h
+++ b/arch/powerpc/include/asm/rtas.h
@@ -125,6 +125,7 @@ struct rtas_suspend_me_data {
#define RTAS_TYPE_INFO 0xE2
#define RTAS_TYPE_DEALLOC 0xE3
#define RTAS_TYPE_DUMP 0xE4
+#define RTAS_TYPE_HOTPLUG 0xE5
/* I don't add PowerMGM events right now, this is a different topic */
#define RTAS_TYPE_PMGM_POWER_SW_ON 0x60
#define RTAS_TYPE_PMGM_POWER_SW_OFF 0x61
@@ -316,6 +317,7 @@ struct pseries_hp_errorlog {
#define PSERIES_HP_ELOG_RESOURCE_MEM 2
#define PSERIES_HP_ELOG_RESOURCE_SLOT 3
#define PSERIES_HP_ELOG_RESOURCE_PHB 4
+#define PSERIES_HP_ELOG_RESOURCE_PMEM 6
#define PSERIES_HP_ELOG_ACTION_ADD 1
#define PSERIES_HP_ELOG_ACTION_REMOVE 2
diff --git a/arch/powerpc/kernel/rtasd.c b/arch/powerpc/kernel/rtasd.c
index 44d66c33d59d..088fe9edd13e 100644
--- a/arch/powerpc/kernel/rtasd.c
+++ b/arch/powerpc/kernel/rtasd.c
@@ -91,6 +91,8 @@ static char *rtas_event_type(int type)
return "Dump Notification Event";
case RTAS_TYPE_PRRN:
return "Platform Resource Reassignment Event";
+ case RTAS_TYPE_HOTPLUG:
+ return "Hotplug Event";
}
return rtas_type[0];
diff --git a/arch/powerpc/platforms/pseries/Makefile b/arch/powerpc/platforms/pseries/Makefile
index 7e89d5c47068..892b27ced973 100644
--- a/arch/powerpc/platforms/pseries/Makefile
+++ b/arch/powerpc/platforms/pseries/Makefile
@@ -13,7 +13,7 @@ obj-$(CONFIG_KEXEC_CORE) += kexec.o
obj-$(CONFIG_PSERIES_ENERGY) += pseries_energy.o
obj-$(CONFIG_HOTPLUG_CPU) += hotplug-cpu.o
-obj-$(CONFIG_MEMORY_HOTPLUG) += hotplug-memory.o
+obj-$(CONFIG_MEMORY_HOTPLUG) += hotplug-memory.o pmem.o
obj-$(CONFIG_HVC_CONSOLE) += hvconsole.o
obj-$(CONFIG_HVCS) += hvcserver.o
diff --git a/arch/powerpc/platforms/pseries/dlpar.c b/arch/powerpc/platforms/pseries/dlpar.c
index a0b20c03f078..795996fefdb9 100644
--- a/arch/powerpc/platforms/pseries/dlpar.c
+++ b/arch/powerpc/platforms/pseries/dlpar.c
@@ -357,6 +357,10 @@ static int handle_dlpar_errorlog(struct pseries_hp_errorlog *hp_elog)
case PSERIES_HP_ELOG_RESOURCE_CPU:
rc = dlpar_cpu(hp_elog);
break;
+ case PSERIES_HP_ELOG_RESOURCE_PMEM:
+ rc = dlpar_hp_pmem(hp_elog);
+ break;
+
default:
pr_warn_ratelimited("Invalid resource (%d) specified\n",
hp_elog->resource);
diff --git a/arch/powerpc/platforms/pseries/firmware.c b/arch/powerpc/platforms/pseries/firmware.c
index a3bbeb43689e..4927de57d8ee 100644
--- a/arch/powerpc/platforms/pseries/firmware.c
+++ b/arch/powerpc/platforms/pseries/firmware.c
@@ -65,6 +65,7 @@ hypertas_fw_features_table[] = {
{FW_FEATURE_SET_MODE, "hcall-set-mode"},
{FW_FEATURE_BEST_ENERGY, "hcall-best-energy-1*"},
{FW_FEATURE_HPT_RESIZE, "hcall-hpt-resize"},
+ {FW_FEATURE_PAPR_SCM, "hcall-scm"},
};
/* Build up the firmware features bitmask using the contents of
diff --git a/arch/powerpc/platforms/pseries/pmem.c b/arch/powerpc/platforms/pseries/pmem.c
new file mode 100644
index 000000000000..a27f40eb57b1
--- /dev/null
+++ b/arch/powerpc/platforms/pseries/pmem.c
@@ -0,0 +1,164 @@
+// SPDX-License-Identifier: GPL-2.0
+
+/*
+ * Handles hot and cold plug of persistent memory regions on pseries.
+ */
+
+#define pr_fmt(fmt) "pseries-pmem: " fmt
+
+#include <linux/kernel.h>
+#include <linux/interrupt.h>
+#include <linux/delay.h>
+#include <linux/sched.h> /* for idle_task_exit */
+#include <linux/sched/hotplug.h>
+#include <linux/cpu.h>
+#include <linux/of.h>
+#include <linux/of_platform.h>
+#include <linux/slab.h>
+#include <asm/prom.h>
+#include <asm/rtas.h>
+#include <asm/firmware.h>
+#include <asm/machdep.h>
+#include <asm/vdso_datapage.h>
+#include <asm/plpar_wrappers.h>
+#include <asm/topology.h>
+
+#include "pseries.h"
+#include "offline_states.h"
+
+static struct device_node *pmem_node;
+
+static ssize_t pmem_drc_add_node(u32 drc_index)
+{
+ struct device_node *dn;
+ int rc;
+
+ pr_debug("Attempting to add pmem node, drc index: %x\n", drc_index);
+
+ rc = dlpar_acquire_drc(drc_index);
+ if (rc) {
+ pr_err("Failed to acquire DRC, rc: %d, drc index: %x\n",
+ rc, drc_index);
+ return -EINVAL;
+ }
+
+ dn = dlpar_configure_connector(cpu_to_be32(drc_index), pmem_node);
+ if (!dn) {
+ pr_err("configure-connector failed for drc %x\n", drc_index);
+ dlpar_release_drc(drc_index);
+ return -EINVAL;
+ }
+
+ /* NB: The of reconfig notifier creates platform device from the node */
+ rc = dlpar_attach_node(dn, pmem_node);
+ if (rc) {
+ pr_err("Failed to attach node %s, rc: %d, drc index: %x\n",
+ dn->name, rc, drc_index);
+
+ if (dlpar_release_drc(drc_index))
+ dlpar_free_cc_nodes(dn);
+
+ return rc;
+ }
+
+ pr_info("Successfully added %pOF, drc index: %x\n", dn, drc_index);
+
+ return 0;
+}
+
+static ssize_t pmem_drc_remove_node(u32 drc_index)
+{
+ struct device_node *dn;
+ uint32_t index;
+ int rc;
+
+ for_each_child_of_node(pmem_node, dn) {
+ if (of_property_read_u32(dn, "ibm,my-drc-index", &index))
+ continue;
+ if (index == drc_index)
+ break;
+ }
+
+ if (!dn) {
+ pr_err("Attempting to remove unused DRC index %x\n", drc_index);
+ return -ENODEV;
+ }
+
+ pr_debug("Attempting to remove %pOF, drc index: %x\n", dn, drc_index);
+
+ /* * NB: tears down the ibm,pmemory device as a side-effect */
+ rc = dlpar_detach_node(dn);
+ if (rc)
+ return rc;
+
+ rc = dlpar_release_drc(drc_index);
+ if (rc) {
+ pr_err("Failed to release drc (%x) for CPU %s, rc: %d\n",
+ drc_index, dn->name, rc);
+ dlpar_attach_node(dn, pmem_node);
+ return rc;
+ }
+
+ pr_info("Successfully removed PMEM with drc index: %x\n", drc_index);
+
+ return 0;
+}
+
+int dlpar_hp_pmem(struct pseries_hp_errorlog *hp_elog)
+{
+ u32 count, drc_index;
+ int rc;
+
+ /* slim chance, but we might get a hotplug event while booting */
+ if (!pmem_node)
+ pmem_node = of_find_node_by_type(NULL, "ibm,persistent-memory");
+ if (!pmem_node) {
+ pr_err("Hotplug event for a pmem device, but none exists\n");
+ return -ENODEV;
+ }
+
+ if (hp_elog->id_type != PSERIES_HP_ELOG_ID_DRC_INDEX) {
+ pr_err("Unsupported hotplug event type %d\n",
+ hp_elog->id_type);
+ return -EINVAL;
+ }
+
+ count = hp_elog->_drc_u.drc_count;
+ drc_index = hp_elog->_drc_u.drc_index;
+
+ lock_device_hotplug();
+
+ if (hp_elog->action == PSERIES_HP_ELOG_ACTION_ADD) {
+ rc = pmem_drc_add_node(drc_index);
+ } else if (hp_elog->action == PSERIES_HP_ELOG_ACTION_REMOVE) {
+ rc = pmem_drc_remove_node(drc_index);
+ } else {
+ pr_err("Unsupported hotplug action (%d)\n", hp_elog->action);
+ rc = -EINVAL;
+ }
+
+ unlock_device_hotplug();
+ return rc;
+}
+
+const struct of_device_id drc_pmem_match[] = {
+ { .type = "ibm,persistent-memory", },
+ {}
+};
+
+static int pseries_pmem_init(void)
+{
+ pmem_node = of_find_node_by_type(NULL, "ibm,persistent-memory");
+ if (!pmem_node)
+ return 0;
+
+ /*
+ * The generic OF bus probe/populate handles creating platform devices
+ * from the child (ibm,pmemory) nodes. The generic code registers an of
+ * reconfig notifier to handle the hot-add/remove cases too.
+ */
+ of_platform_bus_probe(pmem_node, drc_pmem_match, NULL);
+
+ return 0;
+}
+machine_arch_initcall(pseries, pseries_pmem_init);
diff --git a/arch/powerpc/platforms/pseries/pseries.h b/arch/powerpc/platforms/pseries/pseries.h
index 60db2ee511fb..d0829677c896 100644
--- a/arch/powerpc/platforms/pseries/pseries.h
+++ b/arch/powerpc/platforms/pseries/pseries.h
@@ -63,11 +63,16 @@ void queue_hotplug_event(struct pseries_hp_errorlog *hp_errlog,
struct completion *hotplug_done, int *rc);
#ifdef CONFIG_MEMORY_HOTPLUG
int dlpar_memory(struct pseries_hp_errorlog *hp_elog);
+int dlpar_hp_pmem(struct pseries_hp_errorlog *hp_elog);
#else
static inline int dlpar_memory(struct pseries_hp_errorlog *hp_elog)
{
return -EOPNOTSUPP;
}
+int dlpar_hp_pmem(struct pseries_hp_errorlog *hp_elog)
+{
+ return -EOPNOTSUPP;
+};
#endif
#ifdef CONFIG_HOTPLUG_CPU
diff --git a/arch/powerpc/platforms/pseries/ras.c b/arch/powerpc/platforms/pseries/ras.c
index 851ce326874a..ae22fc007276 100644
--- a/arch/powerpc/platforms/pseries/ras.c
+++ b/arch/powerpc/platforms/pseries/ras.c
@@ -237,7 +237,8 @@ static irqreturn_t ras_hotplug_interrupt(int irq, void *dev_id)
* hotplug events on the ras_log_buf to be handled by rtas_errd.
*/
if (hp_elog->resource == PSERIES_HP_ELOG_RESOURCE_MEM ||
- hp_elog->resource == PSERIES_HP_ELOG_RESOURCE_CPU)
+ hp_elog->resource == PSERIES_HP_ELOG_RESOURCE_CPU ||
+ hp_elog->resource == PSERIES_HP_ELOG_RESOURCE_PMEM)
queue_hotplug_event(hp_elog, NULL, NULL);
else
log_error(ras_log_buf, ERR_TYPE_RTAS_LOG, 0);
--
2.9.5
2 years
[PATCH v2 0/2] kvm "fake DAX" device
by Pankaj Gupta
This patch series has implementation for "fake DAX".
"fake DAX" is fake persistent memory(nvdimm) in guest
which allows to bypass the guest page cache. This also
implements a VIRTIO based asynchronous flush mechanism.
Sharing guest kernel driver in this patchset with the
changes suggested in v1. Tested with Qemu side device
emulation for virtio-pmem [4].
Details of project idea for 'fake DAX' flushing interface
is shared [2] & [3].
Implementation is divided into two parts:
New virtio pmem guest driver and qemu code changes for new
virtio pmem paravirtualized device.
1. Guest virtio-pmem kernel driver
---------------------------------
- Reads persistent memory range from paravirt device and
registers with 'nvdimm_bus'.
- 'nvdimm/pmem' driver uses this information to allocate
persistent memory region and setup filesystem operations
to the allocated memory.
- virtio pmem driver implements asynchronous flushing
interface to flush from guest to host.
2. Qemu virtio-pmem device
---------------------------------
- Creates virtio pmem device and exposes a memory range to
KVM guest.
- At host side this is file backed memory which acts as
persistent memory.
- Qemu side flush uses aio thread pool API's and virtio
for asynchronous guest multi request handling.
David Hildenbrand CCed also posted a modified version[5] of
qemu virtio-pmem code based on updated Qemu memory device API.
Virtio-pmem errors handling:
----------------------------------------
Checked behaviour of virtio-pmem for below types of errors
Need suggestions on expected behaviour for handling these errors?
- Hardware Errors: Uncorrectable recoverable Errors:
a] virtio-pmem:
- As per current logic if error page belongs to Qemu process,
host MCE handler isolates(hwpoison) that page and send SIGBUS.
Qemu SIGBUS handler injects exception to KVM guest.
- KVM guest then isolates the page and send SIGBUS to guest
userspace process which has mapped the page.
b] Existing implementation for ACPI pmem driver:
- Handles such errors with MCE notifier and creates a list
of bad blocks. Read/direct access DAX operation return EIO
if accessed memory page fall in bad block list.
- It also starts backgound scrubbing.
- Similar functionality can be reused in virtio-pmem with MCE
notifier but without scrubbing(no ACPI/ARS)? Need inputs to
confirm if this behaviour is ok or needs any change?
Changes from PATCH v1: [1]
- 0-day build test for build dependency on libnvdimm
Changes suggested by - [Dan Williams]
- Split the driver into two parts virtio & pmem
- Move queuing of async block request to block layer
- Add "sync" parameter in nvdimm_flush function
- Use indirect call for nvdimm_flush
- Don’t move declarations to common global header e.g nd.h
- nvdimm_flush() return 0 or -EIO if it fails
- Teach nsio_rw_bytes() that the flush can fail
- Rename nvdimm_flush() to generic_nvdimm_flush()
- Use 'nd_region->provider_data' for long dereferencing
- Remove virtio_pmem_freeze/restore functions
- Remove BSD license text with SPDX license text
- Add might_sleep() in virtio_pmem_flush - [Luiz]
- Make spin_lock_irqsave() narrow
Changes from RFC v3
- Rebase to latest upstream - Luiz
- Call ndregion->flush in place of nvdimm_flush- Luiz
- kmalloc return check - Luiz
- virtqueue full handling - Stefan
- Don't map entire virtio_pmem_req to device - Stefan
- request leak, correct sizeof req- Stefan
- Move declaration to virtio_pmem.c
Changes from RFC v2:
- Add flush function in the nd_region in place of switching
on a flag - Dan & Stefan
- Add flush completion function with proper locking and wait
for host side flush completion - Stefan & Dan
- Keep userspace API in uapi header file - Stefan, MST
- Use LE fields & New device id - MST
- Indentation & spacing suggestions - MST & Eric
- Remove extra header files & add licensing - Stefan
Changes from RFC v1:
- Reuse existing 'pmem' code for registering persistent
memory and other operations instead of creating an entirely
new block driver.
- Use VIRTIO driver to register memory information with
nvdimm_bus and create region_type accordingly.
- Call VIRTIO flush from existing pmem driver.
Pankaj Gupta (2):
libnvdimm: nd_region flush callback support
virtio-pmem: Add virtio-pmem guest driver
[1] https://lkml.org/lkml/2018/8/31/407
[2] https://www.spinics.net/lists/kvm/msg149761.html
[3] https://www.spinics.net/lists/kvm/msg153095.html
[4] https://lkml.org/lkml/2018/8/31/413
[5] https://marc.info/?l=qemu-devel&m=153555721901824&w=2
drivers/acpi/nfit/core.c | 8 ++--
drivers/nvdimm/claim.c | 12 ++++--
drivers/nvdimm/nd.h | 2 +
drivers/nvdimm/pmem.c | 24 +++++++++----
drivers/nvdimm/region_devs.c | 76 ++++++++++++++++++++++++++++++++++++++++---
include/linux/libnvdimm.h | 10 ++++-
6 files changed, 110 insertions(+), 22 deletions(-)
2 years
[PATCH v4 0/7] ndctl: add security support
by Dave Jiang
The following series implements mechanisms that utilize the sysfs knobs
provided by the kernel in order to support the Intel DSM v1.7 spec
that provides security to NVDIMM. The following abilities are added:
1. display security state
2. update security
3. disable security
4. freeze security
5. secure erase
6. kernel unlock upcall support
v4:
- Updated to match latest kernel interface.
- Added unit test for all security calls
v3:
- Added support to inject keys in order to update nvdimm security.
v2:
- Fixup the upcall util to match recent kernel updates for nvdimm security.
---
Dave Jiang (7):
ndctl: add support for display security state
ndctl: add update to security support
ndctl: add disable security support
ndctl: add support for freeze security
ndctl: add support for sanitize dimm
ndctl: add request-key upcall reference app
ndctl: add unit test for security ops (minus overwrite)
Documentation/ndctl/Makefile.am | 7 +
Documentation/ndctl/ndctl-disable-security.txt | 48 +++++
Documentation/ndctl/ndctl-freeze-security.txt | 21 ++
Documentation/ndctl/ndctl-list.txt | 8 +
Documentation/ndctl/ndctl-sanitize.txt | 52 +++++
Documentation/ndctl/ndctl-update-security.txt | 56 ++++++
Documentation/ndctl/nvdimm-upcall.txt | 33 +++
Makefile.am | 5 +
builtin.h | 4
configure.ac | 5 +
contrib/nvdimm.conf | 1
ndctl.spec.in | 3
ndctl/Makefile.am | 7 +
ndctl/dimm.c | 228 +++++++++++++++++++++++-
ndctl/lib/Makefile.am | 4
ndctl/lib/dimm.c | 63 +++++++
ndctl/lib/keys.c | 139 +++++++++++++++
ndctl/lib/libndctl.sym | 11 +
ndctl/libndctl.h | 18 ++
ndctl/ndctl.c | 4
ndctl/nvdimm-upcall.c | 154 ++++++++++++++++
test/Makefile.am | 3
test/security.sh | 187 ++++++++++++++++++++
util/json.c | 8 +
24 files changed, 1054 insertions(+), 15 deletions(-)
create mode 100644 Documentation/ndctl/ndctl-disable-security.txt
create mode 100644 Documentation/ndctl/ndctl-freeze-security.txt
create mode 100644 Documentation/ndctl/ndctl-sanitize.txt
create mode 100644 Documentation/ndctl/ndctl-update-security.txt
create mode 100644 Documentation/ndctl/nvdimm-upcall.txt
create mode 100644 contrib/nvdimm.conf
create mode 100644 ndctl/lib/keys.c
create mode 100644 ndctl/nvdimm-upcall.c
create mode 100755 test/security.sh
--
Signature
2 years
[ndctl PATCH] test, dsm-fail: Cleanup leftover debug
by Dan Williams
Prints from a debug session got committed, delete them.
Signed-off-by: Dan Williams <dan.j.williams(a)intel.com>
---
test/dsm-fail.c | 11 +----------
1 file changed, 1 insertion(+), 10 deletions(-)
diff --git a/test/dsm-fail.c b/test/dsm-fail.c
index 6845f818c8da..6e812aec008f 100644
--- a/test/dsm-fail.c
+++ b/test/dsm-fail.c
@@ -291,48 +291,39 @@ static int do_test(struct ndctl_ctx *ctx, struct ndctl_test *test)
&log_ctx);
if (rc)
goto out;
- fprintf(stderr, "%s:%d\n", __func__, __LINE__);
rc = test_dimms_enable(bus, victim, true);
if (rc)
goto out;
- fprintf(stderr, "%s:%d\n", __func__, __LINE__);
rc = test_regions_enable(bus, victim, victim_region, true, 2);
if (rc)
goto out;
- fprintf(stderr, "%s:%d\n", __func__, __LINE__);
rc = set_dimm_response(DIMM_PATH, ND_CMD_GET_CONFIG_SIZE, 0, &log_ctx);
if (rc)
goto out;
ndctl_region_foreach(bus, region)
ndctl_region_disable_invalidate(region);
- fprintf(stderr, "%s:%d\n", __func__, __LINE__);
rc = dimms_disable(bus);
if (rc)
goto out;
- fprintf(stderr, "%s:%d\n", __func__, __LINE__);
rc = set_dimm_response(DIMM_PATH, ND_CMD_GET_CONFIG_DATA, -EACCES,
&log_ctx);
if (rc)
goto out;
- fprintf(stderr, "%s:%d\n", __func__, __LINE__);
+
rc = test_dimms_enable(bus, victim, false);
if (rc)
goto out;
- fprintf(stderr, "%s:%d\n", __func__, __LINE__);
rc = test_regions_enable(bus, victim, victim_region, false, 0);
if (rc)
goto out;
- fprintf(stderr, "%s:%d\n", __func__, __LINE__);
rc = set_dimm_response(DIMM_PATH, ND_CMD_GET_CONFIG_DATA, 0, &log_ctx);
if (rc)
goto out;
- fprintf(stderr, "%s:%d\n", __func__, __LINE__);
rc = dimms_disable(bus);
if (rc)
goto out;
- fprintf(stderr, "%s:%d\n", __func__, __LINE__);
out:
err = rc;
2 years
