[RFC PATCH 0/3] realize dax_operations for dm-snapshot
by Huaisheng Ye
From: Huaisheng Ye <yehs1(a)lenovo.com>
This series patches are used to realize the dax_operations for dm-snapshot
with persistent memory device.
Here are the steps about how to verify the function.
1. Configure the persistent memory to fs-dax mode and create namespace with ndctl;
2. find them in /dev;
# ndctl list
{
"dev":"namespace0.0",
"mode":"fsdax",
"map":"dev",
"size":132118478848,
"sector_size":512,
"blockdev":"pmem0",
"name":"yhs_pmem0",
"numa_node":0
},
3. create lv_pmem (here is 4G size) for testing;
# pvcreate /dev/pmem0
# vgcreate vg_pmem /dev/pmem0
# lvcreate -L 4G -n lv_pmem vg_pmem
4. create filesystem (ext2 or ext4) to /dev/pmem0
# mkfs.ext2 -b 4096 /dev/vg_pmem/lv_pmem
5. mount pmem with DAX way;
# mkdir /mnt/lv_pmem
# mount -o dax /dev/vg_pmem/lv_pmem /mnt/lv_pmem/
6. cp some files to /mnt/lv_pmem;
# cp linear_table03.log /mnt/lv_pmem/
# cp test0.log /mnt/lv_pmem/
7. create snapshot for test (here I limit it to 1G size);
# lvcreate -L 1G -n snap_pmem -s /dev/vg_pmem/lv_pmem
8. modify the files copied with vim or copy more other new files;
# vim /mnt/lv_pmem/test0.log
9. umount the pmem device;
# umount /mnt/lv_pmem/
10.merge the snapshot back to origin;
# lvconvert --merge /dev/vg_pmem/snap_pmem
11.mount pmem device again for checking the content of files;
# mount -o dax /dev/vg_pmem/lv_pmem /mnt/lv_pmem/
Huaisheng Ye (3):
dm: enable dax_operations for dm-snapshot
dm: expand hc_map in mapped_device for lack of map
dm: expand valid types for dm-ioctl
drivers/md/dm-core.h | 1 +
drivers/md/dm-ioctl.c | 4 +++-
drivers/md/dm-snap.c | 44 ++++++++++++++++++++++++++++++++++++++++++--
drivers/md/dm.c | 15 +++++++++++++++
4 files changed, 61 insertions(+), 3 deletions(-)
--
1.8.3.1
2 years, 2 months
[RFC PATCH 0/3] Maintainer Handbook: Subsystem Profile
by Dan Williams
At a recently concluded session at the Linux Plumbers Conference I
proposed a "Subsystem Profile" as a document that a maintainer can
provide to set contributor expectations and provide fodder for a
discussion between maintainers about the merits of different maintainer
policies.
For those that did not attend, the goal of the Subsystem Profile, and the
Maintainer Handbook more generally, is to provide a desk reference for
maintainers both new and experienced. The session introduction was:
The first rule of kernel maintenance is that there are no hard and
fast rules. That state of affairs is both a blessing and a curse. It
has served the community well to be adaptable to the different
people and different problem spaces that inhabit the kernel
community. However, that variability also leads to inconsistent
experiences for contributors, little to no guidance for new
contributors, and unnecessary stress on current maintainers. There
are quite a few of people who have been around long enough to make
enough mistakes that they have gained some hard earned proficiency.
However if the kernel community expects to keep growing it needs to
be able both scale the maintainers it has and ramp new ones without
necessarily let them make a decades worth of mistakes to learn the
ropes.
To be clear, the proposed document does not impose or suggest new
rules. Instead it provides an outlet to document the unwritten rules
and policies in effect for each subsystem, and that each subsystem
might decide differently for whatever reason.
---
Dan Williams (3):
MAINTAINERS: Reclaim the P: tag for Subsystem Profile
MAINTAINERS, Handbook: Subsystem Profile
libnvdimm, MAINTAINERS: Subsystem Profile
Documentation/maintainer/index.rst | 1
Documentation/maintainer/subsystem-profile.rst | 145 ++++++++++++++++++++++++
Documentation/nvdimm/subsystem-profile.rst | 86 ++++++++++++++
MAINTAINERS | 26 +++-
4 files changed, 249 insertions(+), 9 deletions(-)
create mode 100644 Documentation/maintainer/subsystem-profile.rst
create mode 100644 Documentation/nvdimm/subsystem-profile.rst
2 years, 2 months
[mm PATCH v5 0/7] Deferred page init improvements
by Alexander Duyck
This patchset is essentially a refactor of the page initialization logic
that is meant to provide for better code reuse while providing a
significant improvement in deferred page initialization performance.
In my testing on an x86_64 system with 384GB of RAM and 3TB of persistent
memory per node I have seen the following. In the case of regular memory
initialization the deferred init time was decreased from 3.75s to 1.06s on
average. For the persistent memory the initialization time dropped from
24.17s to 19.12s on average. This amounts to a 253% improvement for the
deferred memory initialization performance, and a 26% improvement in the
persistent memory initialization performance.
I have called out the improvement observed with each patch.
v1->v2:
Fixed build issue on PowerPC due to page struct size being 56
Added new patch that removed __SetPageReserved call for hotplug
v2->v3:
Rebased on latest linux-next
Removed patch that had removed __SetPageReserved call from init
Added patch that folded __SetPageReserved into set_page_links
Tweaked __init_pageblock to use start_pfn to get section_nr instead of pfn
v3->v4:
Updated patch description and comments for mm_zero_struct_page patch
Replaced "default" with "case 64"
Removed #ifndef mm_zero_struct_page
Fixed typo in comment that ommited "_from" in kerneldoc for iterator
Added Reviewed-by for patches reviewed by Pavel
Added Acked-by from Michal Hocko
Added deferred init times for patches that affect init performance
Swapped patches 5 & 6, pulled some code/comments from 4 into 5
v4->v5:
Updated Acks/Reviewed-by
Rebased on latest linux-next
Split core bits of zone iterator patch from MAX_ORDER_NR_PAGES init
---
Alexander Duyck (7):
mm: Use mm_zero_struct_page from SPARC on all 64b architectures
mm: Drop meminit_pfn_in_nid as it is redundant
mm: Implement new zone specific memblock iterator
mm: Initialize MAX_ORDER_NR_PAGES at a time instead of doing larger sections
mm: Move hot-plug specific memory init into separate functions and optimize
mm: Add reserved flag setting to set_page_links
mm: Use common iterator for deferred_init_pages and deferred_free_pages
arch/sparc/include/asm/pgtable_64.h | 30 --
include/linux/memblock.h | 38 ++
include/linux/mm.h | 50 +++
mm/memblock.c | 63 ++++
mm/page_alloc.c | 567 +++++++++++++++++++++--------------
5 files changed, 492 insertions(+), 256 deletions(-)
--
2 years, 2 months
[PATCH 4.18 074/171] acpi/nfit, x86/mce: Validate a MCEs address before using it
by Greg Kroah-Hartman
4.18-stable review patch. If anyone has any objections, please let me know.
------------------
From: Vishal Verma <vishal.l.verma(a)intel.com>
commit e8a308e5f47e545e0d41d0686c00f5f5217c5f61 upstream.
The NFIT machine check handler uses the physical address from the mce
structure, and compares it against information in the ACPI NFIT table
to determine whether that location lies on an NVDIMM. The mce->addr
field however may not always be valid, and this is indicated by the
MCI_STATUS_ADDRV bit in the status field.
Export mce_usable_address() which already performs validation for the
address, and use it in the NFIT handler.
Fixes: 6839a6d96f4e ("nfit: do an ARS scrub on hitting a latent media error")
Reported-by: Robert Elliott <elliott(a)hpe.com>
Signed-off-by: Vishal Verma <vishal.l.verma(a)intel.com>
Signed-off-by: Borislav Petkov <bp(a)suse.de>
CC: Arnd Bergmann <arnd(a)arndb.de>
Cc: Dan Williams <dan.j.williams(a)intel.com>
CC: Dave Jiang <dave.jiang(a)intel.com>
CC: elliott(a)hpe.com
CC: "H. Peter Anvin" <hpa(a)zytor.com>
CC: Ingo Molnar <mingo(a)redhat.com>
CC: Len Brown <lenb(a)kernel.org>
CC: linux-acpi(a)vger.kernel.org
CC: linux-edac <linux-edac(a)vger.kernel.org>
CC: linux-nvdimm(a)lists.01.org
CC: Qiuxu Zhuo <qiuxu.zhuo(a)intel.com>
CC: "Rafael J. Wysocki" <rjw(a)rjwysocki.net>
CC: Ross Zwisler <zwisler(a)kernel.org>
CC: stable <stable(a)vger.kernel.org>
CC: Thomas Gleixner <tglx(a)linutronix.de>
CC: Tony Luck <tony.luck(a)intel.com>
CC: x86-ml <x86(a)kernel.org>
CC: Yazen Ghannam <yazen.ghannam(a)amd.com>
Link: http://lkml.kernel.org/r/20181026003729.8420-2-vishal.l.verma@intel.com
Signed-off-by: Greg Kroah-Hartman <gregkh(a)linuxfoundation.org>
---
arch/x86/include/asm/mce.h | 1 +
arch/x86/kernel/cpu/mcheck/mce.c | 3 ++-
drivers/acpi/nfit/mce.c | 4 ++++
3 files changed, 7 insertions(+), 1 deletion(-)
--- a/arch/x86/include/asm/mce.h
+++ b/arch/x86/include/asm/mce.h
@@ -217,6 +217,7 @@ static inline int umc_normaddr_to_sysadd
int mce_available(struct cpuinfo_x86 *c);
bool mce_is_memory_error(struct mce *m);
bool mce_is_correctable(struct mce *m);
+int mce_usable_address(struct mce *m);
DECLARE_PER_CPU(unsigned, mce_exception_count);
DECLARE_PER_CPU(unsigned, mce_poll_count);
--- a/arch/x86/kernel/cpu/mcheck/mce.c
+++ b/arch/x86/kernel/cpu/mcheck/mce.c
@@ -489,7 +489,7 @@ static void mce_report_event(struct pt_r
* be somewhat complicated (e.g. segment offset would require an instruction
* parser). So only support physical addresses up to page granuality for now.
*/
-static int mce_usable_address(struct mce *m)
+int mce_usable_address(struct mce *m)
{
if (!(m->status & MCI_STATUS_ADDRV))
return 0;
@@ -509,6 +509,7 @@ static int mce_usable_address(struct mce
return 1;
}
+EXPORT_SYMBOL_GPL(mce_usable_address);
bool mce_is_memory_error(struct mce *m)
{
--- a/drivers/acpi/nfit/mce.c
+++ b/drivers/acpi/nfit/mce.c
@@ -29,6 +29,10 @@ static int nfit_handle_mce(struct notifi
if (!mce_is_memory_error(mce) || mce_is_correctable(mce))
return NOTIFY_DONE;
+ /* Verify the address reported in the MCE is valid. */
+ if (!mce_usable_address(mce))
+ return NOTIFY_DONE;
+
/*
* mce->addr contains the physical addr accessed that caused the
* machine check. We need to walk through the list of NFITs, and see
2 years, 2 months
[PATCH 4.18 073/171] acpi/nfit, x86/mce: Handle only uncorrectable machine checks
by Greg Kroah-Hartman
4.18-stable review patch. If anyone has any objections, please let me know.
------------------
From: Vishal Verma <vishal.l.verma(a)intel.com>
commit 5d96c9342c23ee1d084802dcf064caa67ecaa45b upstream.
The MCE handler for nfit devices is called for memory errors on a
Non-Volatile DIMM and adds the error location to a 'badblocks' list.
This list is used by the various NVDIMM drivers to avoid consuming known
poison locations during IO.
The MCE handler gets called for both corrected and uncorrectable errors.
Until now, both kinds of errors have been added to the badblocks list.
However, corrected memory errors indicate that the problem has already
been fixed by hardware, and the resulting interrupt is merely a
notification to Linux.
As far as future accesses to that location are concerned, it is
perfectly fine to use, and thus doesn't need to be included in the above
badblocks list.
Add a check in the nfit MCE handler to filter out corrected mce events,
and only process uncorrectable errors.
Fixes: 6839a6d96f4e ("nfit: do an ARS scrub on hitting a latent media error")
Reported-by: Omar Avelar <omar.avelar(a)intel.com>
Signed-off-by: Vishal Verma <vishal.l.verma(a)intel.com>
Signed-off-by: Borislav Petkov <bp(a)suse.de>
CC: Arnd Bergmann <arnd(a)arndb.de>
CC: Dan Williams <dan.j.williams(a)intel.com>
CC: Dave Jiang <dave.jiang(a)intel.com>
CC: elliott(a)hpe.com
CC: "H. Peter Anvin" <hpa(a)zytor.com>
CC: Ingo Molnar <mingo(a)redhat.com>
CC: Len Brown <lenb(a)kernel.org>
CC: linux-acpi(a)vger.kernel.org
CC: linux-edac <linux-edac(a)vger.kernel.org>
CC: linux-nvdimm(a)lists.01.org
CC: Qiuxu Zhuo <qiuxu.zhuo(a)intel.com>
CC: "Rafael J. Wysocki" <rjw(a)rjwysocki.net>
CC: Ross Zwisler <zwisler(a)kernel.org>
CC: stable <stable(a)vger.kernel.org>
CC: Thomas Gleixner <tglx(a)linutronix.de>
CC: Tony Luck <tony.luck(a)intel.com>
CC: x86-ml <x86(a)kernel.org>
CC: Yazen Ghannam <yazen.ghannam(a)amd.com>
Link: http://lkml.kernel.org/r/20181026003729.8420-1-vishal.l.verma@intel.com
Signed-off-by: Greg Kroah-Hartman <gregkh(a)linuxfoundation.org>
---
arch/x86/include/asm/mce.h | 1 +
arch/x86/kernel/cpu/mcheck/mce.c | 3 ++-
drivers/acpi/nfit/mce.c | 4 ++--
3 files changed, 5 insertions(+), 3 deletions(-)
--- a/arch/x86/include/asm/mce.h
+++ b/arch/x86/include/asm/mce.h
@@ -216,6 +216,7 @@ static inline int umc_normaddr_to_sysadd
int mce_available(struct cpuinfo_x86 *c);
bool mce_is_memory_error(struct mce *m);
+bool mce_is_correctable(struct mce *m);
DECLARE_PER_CPU(unsigned, mce_exception_count);
DECLARE_PER_CPU(unsigned, mce_poll_count);
--- a/arch/x86/kernel/cpu/mcheck/mce.c
+++ b/arch/x86/kernel/cpu/mcheck/mce.c
@@ -538,7 +538,7 @@ bool mce_is_memory_error(struct mce *m)
}
EXPORT_SYMBOL_GPL(mce_is_memory_error);
-static bool mce_is_correctable(struct mce *m)
+bool mce_is_correctable(struct mce *m)
{
if (m->cpuvendor == X86_VENDOR_AMD && m->status & MCI_STATUS_DEFERRED)
return false;
@@ -548,6 +548,7 @@ static bool mce_is_correctable(struct mc
return true;
}
+EXPORT_SYMBOL_GPL(mce_is_correctable);
static bool cec_add_mce(struct mce *m)
{
--- a/drivers/acpi/nfit/mce.c
+++ b/drivers/acpi/nfit/mce.c
@@ -25,8 +25,8 @@ static int nfit_handle_mce(struct notifi
struct acpi_nfit_desc *acpi_desc;
struct nfit_spa *nfit_spa;
- /* We only care about memory errors */
- if (!mce_is_memory_error(mce))
+ /* We only care about uncorrectable memory errors */
+ if (!mce_is_memory_error(mce) || mce_is_correctable(mce))
return NOTIFY_DONE;
/*
2 years, 2 months
[PATCH 4.19 091/205] acpi/nfit, x86/mce: Validate a MCEs address before using it
by Greg Kroah-Hartman
4.19-stable review patch. If anyone has any objections, please let me know.
------------------
From: Vishal Verma <vishal.l.verma(a)intel.com>
commit e8a308e5f47e545e0d41d0686c00f5f5217c5f61 upstream.
The NFIT machine check handler uses the physical address from the mce
structure, and compares it against information in the ACPI NFIT table
to determine whether that location lies on an NVDIMM. The mce->addr
field however may not always be valid, and this is indicated by the
MCI_STATUS_ADDRV bit in the status field.
Export mce_usable_address() which already performs validation for the
address, and use it in the NFIT handler.
Fixes: 6839a6d96f4e ("nfit: do an ARS scrub on hitting a latent media error")
Reported-by: Robert Elliott <elliott(a)hpe.com>
Signed-off-by: Vishal Verma <vishal.l.verma(a)intel.com>
Signed-off-by: Borislav Petkov <bp(a)suse.de>
CC: Arnd Bergmann <arnd(a)arndb.de>
Cc: Dan Williams <dan.j.williams(a)intel.com>
CC: Dave Jiang <dave.jiang(a)intel.com>
CC: elliott(a)hpe.com
CC: "H. Peter Anvin" <hpa(a)zytor.com>
CC: Ingo Molnar <mingo(a)redhat.com>
CC: Len Brown <lenb(a)kernel.org>
CC: linux-acpi(a)vger.kernel.org
CC: linux-edac <linux-edac(a)vger.kernel.org>
CC: linux-nvdimm(a)lists.01.org
CC: Qiuxu Zhuo <qiuxu.zhuo(a)intel.com>
CC: "Rafael J. Wysocki" <rjw(a)rjwysocki.net>
CC: Ross Zwisler <zwisler(a)kernel.org>
CC: stable <stable(a)vger.kernel.org>
CC: Thomas Gleixner <tglx(a)linutronix.de>
CC: Tony Luck <tony.luck(a)intel.com>
CC: x86-ml <x86(a)kernel.org>
CC: Yazen Ghannam <yazen.ghannam(a)amd.com>
Link: http://lkml.kernel.org/r/20181026003729.8420-2-vishal.l.verma@intel.com
Signed-off-by: Greg Kroah-Hartman <gregkh(a)linuxfoundation.org>
---
arch/x86/include/asm/mce.h | 1 +
arch/x86/kernel/cpu/mcheck/mce.c | 3 ++-
drivers/acpi/nfit/mce.c | 4 ++++
3 files changed, 7 insertions(+), 1 deletion(-)
--- a/arch/x86/include/asm/mce.h
+++ b/arch/x86/include/asm/mce.h
@@ -217,6 +217,7 @@ static inline int umc_normaddr_to_sysadd
int mce_available(struct cpuinfo_x86 *c);
bool mce_is_memory_error(struct mce *m);
bool mce_is_correctable(struct mce *m);
+int mce_usable_address(struct mce *m);
DECLARE_PER_CPU(unsigned, mce_exception_count);
DECLARE_PER_CPU(unsigned, mce_poll_count);
--- a/arch/x86/kernel/cpu/mcheck/mce.c
+++ b/arch/x86/kernel/cpu/mcheck/mce.c
@@ -485,7 +485,7 @@ static void mce_report_event(struct pt_r
* be somewhat complicated (e.g. segment offset would require an instruction
* parser). So only support physical addresses up to page granuality for now.
*/
-static int mce_usable_address(struct mce *m)
+int mce_usable_address(struct mce *m)
{
if (!(m->status & MCI_STATUS_ADDRV))
return 0;
@@ -505,6 +505,7 @@ static int mce_usable_address(struct mce
return 1;
}
+EXPORT_SYMBOL_GPL(mce_usable_address);
bool mce_is_memory_error(struct mce *m)
{
--- a/drivers/acpi/nfit/mce.c
+++ b/drivers/acpi/nfit/mce.c
@@ -29,6 +29,10 @@ static int nfit_handle_mce(struct notifi
if (!mce_is_memory_error(mce) || mce_is_correctable(mce))
return NOTIFY_DONE;
+ /* Verify the address reported in the MCE is valid. */
+ if (!mce_usable_address(mce))
+ return NOTIFY_DONE;
+
/*
* mce->addr contains the physical addr accessed that caused the
* machine check. We need to walk through the list of NFITs, and see
2 years, 2 months
[PATCH 4.19 090/205] acpi/nfit, x86/mce: Handle only uncorrectable machine checks
by Greg Kroah-Hartman
4.19-stable review patch. If anyone has any objections, please let me know.
------------------
From: Vishal Verma <vishal.l.verma(a)intel.com>
commit 5d96c9342c23ee1d084802dcf064caa67ecaa45b upstream.
The MCE handler for nfit devices is called for memory errors on a
Non-Volatile DIMM and adds the error location to a 'badblocks' list.
This list is used by the various NVDIMM drivers to avoid consuming known
poison locations during IO.
The MCE handler gets called for both corrected and uncorrectable errors.
Until now, both kinds of errors have been added to the badblocks list.
However, corrected memory errors indicate that the problem has already
been fixed by hardware, and the resulting interrupt is merely a
notification to Linux.
As far as future accesses to that location are concerned, it is
perfectly fine to use, and thus doesn't need to be included in the above
badblocks list.
Add a check in the nfit MCE handler to filter out corrected mce events,
and only process uncorrectable errors.
Fixes: 6839a6d96f4e ("nfit: do an ARS scrub on hitting a latent media error")
Reported-by: Omar Avelar <omar.avelar(a)intel.com>
Signed-off-by: Vishal Verma <vishal.l.verma(a)intel.com>
Signed-off-by: Borislav Petkov <bp(a)suse.de>
CC: Arnd Bergmann <arnd(a)arndb.de>
CC: Dan Williams <dan.j.williams(a)intel.com>
CC: Dave Jiang <dave.jiang(a)intel.com>
CC: elliott(a)hpe.com
CC: "H. Peter Anvin" <hpa(a)zytor.com>
CC: Ingo Molnar <mingo(a)redhat.com>
CC: Len Brown <lenb(a)kernel.org>
CC: linux-acpi(a)vger.kernel.org
CC: linux-edac <linux-edac(a)vger.kernel.org>
CC: linux-nvdimm(a)lists.01.org
CC: Qiuxu Zhuo <qiuxu.zhuo(a)intel.com>
CC: "Rafael J. Wysocki" <rjw(a)rjwysocki.net>
CC: Ross Zwisler <zwisler(a)kernel.org>
CC: stable <stable(a)vger.kernel.org>
CC: Thomas Gleixner <tglx(a)linutronix.de>
CC: Tony Luck <tony.luck(a)intel.com>
CC: x86-ml <x86(a)kernel.org>
CC: Yazen Ghannam <yazen.ghannam(a)amd.com>
Link: http://lkml.kernel.org/r/20181026003729.8420-1-vishal.l.verma@intel.com
Signed-off-by: Greg Kroah-Hartman <gregkh(a)linuxfoundation.org>
---
arch/x86/include/asm/mce.h | 1 +
arch/x86/kernel/cpu/mcheck/mce.c | 3 ++-
drivers/acpi/nfit/mce.c | 4 ++--
3 files changed, 5 insertions(+), 3 deletions(-)
--- a/arch/x86/include/asm/mce.h
+++ b/arch/x86/include/asm/mce.h
@@ -216,6 +216,7 @@ static inline int umc_normaddr_to_sysadd
int mce_available(struct cpuinfo_x86 *c);
bool mce_is_memory_error(struct mce *m);
+bool mce_is_correctable(struct mce *m);
DECLARE_PER_CPU(unsigned, mce_exception_count);
DECLARE_PER_CPU(unsigned, mce_poll_count);
--- a/arch/x86/kernel/cpu/mcheck/mce.c
+++ b/arch/x86/kernel/cpu/mcheck/mce.c
@@ -534,7 +534,7 @@ bool mce_is_memory_error(struct mce *m)
}
EXPORT_SYMBOL_GPL(mce_is_memory_error);
-static bool mce_is_correctable(struct mce *m)
+bool mce_is_correctable(struct mce *m)
{
if (m->cpuvendor == X86_VENDOR_AMD && m->status & MCI_STATUS_DEFERRED)
return false;
@@ -544,6 +544,7 @@ static bool mce_is_correctable(struct mc
return true;
}
+EXPORT_SYMBOL_GPL(mce_is_correctable);
static bool cec_add_mce(struct mce *m)
{
--- a/drivers/acpi/nfit/mce.c
+++ b/drivers/acpi/nfit/mce.c
@@ -25,8 +25,8 @@ static int nfit_handle_mce(struct notifi
struct acpi_nfit_desc *acpi_desc;
struct nfit_spa *nfit_spa;
- /* We only care about memory errors */
- if (!mce_is_memory_error(mce))
+ /* We only care about uncorrectable memory errors */
+ if (!mce_is_memory_error(mce) || mce_is_correctable(mce))
return NOTIFY_DONE;
/*
2 years, 2 months
Patch "acpi/nfit, x86/mce: Handle only uncorrectable machine checks" has been added to the 4.19-stable tree
by gregkh＠linuxfoundation.org
This is a note to let you know that I've just added the patch titled
acpi/nfit, x86/mce: Handle only uncorrectable machine checks
to the 4.19-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=s...
The filename of the patch is:
acpi-nfit-x86-mce-handle-only-uncorrectable-machine-checks.patch
and it can be found in the queue-4.19 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable(a)vger.kernel.org> know about it.
>From 5d96c9342c23ee1d084802dcf064caa67ecaa45b Mon Sep 17 00:00:00 2001
From: Vishal Verma <vishal.l.verma(a)intel.com>
Date: Thu, 25 Oct 2018 18:37:28 -0600
Subject: acpi/nfit, x86/mce: Handle only uncorrectable machine checks
From: Vishal Verma <vishal.l.verma(a)intel.com>
commit 5d96c9342c23ee1d084802dcf064caa67ecaa45b upstream.
The MCE handler for nfit devices is called for memory errors on a
Non-Volatile DIMM and adds the error location to a 'badblocks' list.
This list is used by the various NVDIMM drivers to avoid consuming known
poison locations during IO.
The MCE handler gets called for both corrected and uncorrectable errors.
Until now, both kinds of errors have been added to the badblocks list.
However, corrected memory errors indicate that the problem has already
been fixed by hardware, and the resulting interrupt is merely a
notification to Linux.
As far as future accesses to that location are concerned, it is
perfectly fine to use, and thus doesn't need to be included in the above
badblocks list.
Add a check in the nfit MCE handler to filter out corrected mce events,
and only process uncorrectable errors.
Fixes: 6839a6d96f4e ("nfit: do an ARS scrub on hitting a latent media error")
Reported-by: Omar Avelar <omar.avelar(a)intel.com>
Signed-off-by: Vishal Verma <vishal.l.verma(a)intel.com>
Signed-off-by: Borislav Petkov <bp(a)suse.de>
CC: Arnd Bergmann <arnd(a)arndb.de>
CC: Dan Williams <dan.j.williams(a)intel.com>
CC: Dave Jiang <dave.jiang(a)intel.com>
CC: elliott(a)hpe.com
CC: "H. Peter Anvin" <hpa(a)zytor.com>
CC: Ingo Molnar <mingo(a)redhat.com>
CC: Len Brown <lenb(a)kernel.org>
CC: linux-acpi(a)vger.kernel.org
CC: linux-edac <linux-edac(a)vger.kernel.org>
CC: linux-nvdimm(a)lists.01.org
CC: Qiuxu Zhuo <qiuxu.zhuo(a)intel.com>
CC: "Rafael J. Wysocki" <rjw(a)rjwysocki.net>
CC: Ross Zwisler <zwisler(a)kernel.org>
CC: stable <stable(a)vger.kernel.org>
CC: Thomas Gleixner <tglx(a)linutronix.de>
CC: Tony Luck <tony.luck(a)intel.com>
CC: x86-ml <x86(a)kernel.org>
CC: Yazen Ghannam <yazen.ghannam(a)amd.com>
Link: http://lkml.kernel.org/r/20181026003729.8420-1-vishal.l.verma@intel.com
Signed-off-by: Greg Kroah-Hartman <gregkh(a)linuxfoundation.org>
---
arch/x86/include/asm/mce.h | 1 +
arch/x86/kernel/cpu/mcheck/mce.c | 3 ++-
drivers/acpi/nfit/mce.c | 4 ++--
3 files changed, 5 insertions(+), 3 deletions(-)
--- a/arch/x86/include/asm/mce.h
+++ b/arch/x86/include/asm/mce.h
@@ -216,6 +216,7 @@ static inline int umc_normaddr_to_sysadd
int mce_available(struct cpuinfo_x86 *c);
bool mce_is_memory_error(struct mce *m);
+bool mce_is_correctable(struct mce *m);
DECLARE_PER_CPU(unsigned, mce_exception_count);
DECLARE_PER_CPU(unsigned, mce_poll_count);
--- a/arch/x86/kernel/cpu/mcheck/mce.c
+++ b/arch/x86/kernel/cpu/mcheck/mce.c
@@ -534,7 +534,7 @@ bool mce_is_memory_error(struct mce *m)
}
EXPORT_SYMBOL_GPL(mce_is_memory_error);
-static bool mce_is_correctable(struct mce *m)
+bool mce_is_correctable(struct mce *m)
{
if (m->cpuvendor == X86_VENDOR_AMD && m->status & MCI_STATUS_DEFERRED)
return false;
@@ -544,6 +544,7 @@ static bool mce_is_correctable(struct mc
return true;
}
+EXPORT_SYMBOL_GPL(mce_is_correctable);
static bool cec_add_mce(struct mce *m)
{
--- a/drivers/acpi/nfit/mce.c
+++ b/drivers/acpi/nfit/mce.c
@@ -25,8 +25,8 @@ static int nfit_handle_mce(struct notifi
struct acpi_nfit_desc *acpi_desc;
struct nfit_spa *nfit_spa;
- /* We only care about memory errors */
- if (!mce_is_memory_error(mce))
+ /* We only care about uncorrectable memory errors */
+ if (!mce_is_memory_error(mce) || mce_is_correctable(mce))
return NOTIFY_DONE;
/*
Patches currently in stable-queue which might be from vishal.l.verma(a)intel.com are
queue-4.19/acpi-nfit-x86-mce-validate-a-mce-s-address-before-using-it.patch
queue-4.19/acpi-nfit-x86-mce-handle-only-uncorrectable-machine-checks.patch
2 years, 2 months
Patch "acpi/nfit, x86/mce: Validate a MCE's address before using it" has been added to the 4.19-stable tree
by gregkh＠linuxfoundation.org
This is a note to let you know that I've just added the patch titled
acpi/nfit, x86/mce: Validate a MCE's address before using it
to the 4.19-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=s...
The filename of the patch is:
acpi-nfit-x86-mce-validate-a-mce-s-address-before-using-it.patch
and it can be found in the queue-4.19 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable(a)vger.kernel.org> know about it.
>From e8a308e5f47e545e0d41d0686c00f5f5217c5f61 Mon Sep 17 00:00:00 2001
From: Vishal Verma <vishal.l.verma(a)intel.com>
Date: Thu, 25 Oct 2018 18:37:29 -0600
Subject: acpi/nfit, x86/mce: Validate a MCE's address before using it
From: Vishal Verma <vishal.l.verma(a)intel.com>
commit e8a308e5f47e545e0d41d0686c00f5f5217c5f61 upstream.
The NFIT machine check handler uses the physical address from the mce
structure, and compares it against information in the ACPI NFIT table
to determine whether that location lies on an NVDIMM. The mce->addr
field however may not always be valid, and this is indicated by the
MCI_STATUS_ADDRV bit in the status field.
Export mce_usable_address() which already performs validation for the
address, and use it in the NFIT handler.
Fixes: 6839a6d96f4e ("nfit: do an ARS scrub on hitting a latent media error")
Reported-by: Robert Elliott <elliott(a)hpe.com>
Signed-off-by: Vishal Verma <vishal.l.verma(a)intel.com>
Signed-off-by: Borislav Petkov <bp(a)suse.de>
CC: Arnd Bergmann <arnd(a)arndb.de>
Cc: Dan Williams <dan.j.williams(a)intel.com>
CC: Dave Jiang <dave.jiang(a)intel.com>
CC: elliott(a)hpe.com
CC: "H. Peter Anvin" <hpa(a)zytor.com>
CC: Ingo Molnar <mingo(a)redhat.com>
CC: Len Brown <lenb(a)kernel.org>
CC: linux-acpi(a)vger.kernel.org
CC: linux-edac <linux-edac(a)vger.kernel.org>
CC: linux-nvdimm(a)lists.01.org
CC: Qiuxu Zhuo <qiuxu.zhuo(a)intel.com>
CC: "Rafael J. Wysocki" <rjw(a)rjwysocki.net>
CC: Ross Zwisler <zwisler(a)kernel.org>
CC: stable <stable(a)vger.kernel.org>
CC: Thomas Gleixner <tglx(a)linutronix.de>
CC: Tony Luck <tony.luck(a)intel.com>
CC: x86-ml <x86(a)kernel.org>
CC: Yazen Ghannam <yazen.ghannam(a)amd.com>
Link: http://lkml.kernel.org/r/20181026003729.8420-2-vishal.l.verma@intel.com
Signed-off-by: Greg Kroah-Hartman <gregkh(a)linuxfoundation.org>
---
arch/x86/include/asm/mce.h | 1 +
arch/x86/kernel/cpu/mcheck/mce.c | 3 ++-
drivers/acpi/nfit/mce.c | 4 ++++
3 files changed, 7 insertions(+), 1 deletion(-)
--- a/arch/x86/include/asm/mce.h
+++ b/arch/x86/include/asm/mce.h
@@ -217,6 +217,7 @@ static inline int umc_normaddr_to_sysadd
int mce_available(struct cpuinfo_x86 *c);
bool mce_is_memory_error(struct mce *m);
bool mce_is_correctable(struct mce *m);
+int mce_usable_address(struct mce *m);
DECLARE_PER_CPU(unsigned, mce_exception_count);
DECLARE_PER_CPU(unsigned, mce_poll_count);
--- a/arch/x86/kernel/cpu/mcheck/mce.c
+++ b/arch/x86/kernel/cpu/mcheck/mce.c
@@ -485,7 +485,7 @@ static void mce_report_event(struct pt_r
* be somewhat complicated (e.g. segment offset would require an instruction
* parser). So only support physical addresses up to page granuality for now.
*/
-static int mce_usable_address(struct mce *m)
+int mce_usable_address(struct mce *m)
{
if (!(m->status & MCI_STATUS_ADDRV))
return 0;
@@ -505,6 +505,7 @@ static int mce_usable_address(struct mce
return 1;
}
+EXPORT_SYMBOL_GPL(mce_usable_address);
bool mce_is_memory_error(struct mce *m)
{
--- a/drivers/acpi/nfit/mce.c
+++ b/drivers/acpi/nfit/mce.c
@@ -29,6 +29,10 @@ static int nfit_handle_mce(struct notifi
if (!mce_is_memory_error(mce) || mce_is_correctable(mce))
return NOTIFY_DONE;
+ /* Verify the address reported in the MCE is valid. */
+ if (!mce_usable_address(mce))
+ return NOTIFY_DONE;
+
/*
* mce->addr contains the physical addr accessed that caused the
* machine check. We need to walk through the list of NFITs, and see
Patches currently in stable-queue which might be from vishal.l.verma(a)intel.com are
queue-4.19/acpi-nfit-x86-mce-validate-a-mce-s-address-before-using-it.patch
queue-4.19/acpi-nfit-x86-mce-handle-only-uncorrectable-machine-checks.patch
2 years, 2 months
Patch "acpi/nfit, x86/mce: Validate a MCE's address before using it" has been added to the 4.18-stable tree
by gregkh＠linuxfoundation.org
This is a note to let you know that I've just added the patch titled
acpi/nfit, x86/mce: Validate a MCE's address before using it
to the 4.18-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=s...
The filename of the patch is:
acpi-nfit-x86-mce-validate-a-mce-s-address-before-using-it.patch
and it can be found in the queue-4.18 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable(a)vger.kernel.org> know about it.
>From e8a308e5f47e545e0d41d0686c00f5f5217c5f61 Mon Sep 17 00:00:00 2001
From: Vishal Verma <vishal.l.verma(a)intel.com>
Date: Thu, 25 Oct 2018 18:37:29 -0600
Subject: acpi/nfit, x86/mce: Validate a MCE's address before using it
From: Vishal Verma <vishal.l.verma(a)intel.com>
commit e8a308e5f47e545e0d41d0686c00f5f5217c5f61 upstream.
The NFIT machine check handler uses the physical address from the mce
structure, and compares it against information in the ACPI NFIT table
to determine whether that location lies on an NVDIMM. The mce->addr
field however may not always be valid, and this is indicated by the
MCI_STATUS_ADDRV bit in the status field.
Export mce_usable_address() which already performs validation for the
address, and use it in the NFIT handler.
Fixes: 6839a6d96f4e ("nfit: do an ARS scrub on hitting a latent media error")
Reported-by: Robert Elliott <elliott(a)hpe.com>
Signed-off-by: Vishal Verma <vishal.l.verma(a)intel.com>
Signed-off-by: Borislav Petkov <bp(a)suse.de>
CC: Arnd Bergmann <arnd(a)arndb.de>
Cc: Dan Williams <dan.j.williams(a)intel.com>
CC: Dave Jiang <dave.jiang(a)intel.com>
CC: elliott(a)hpe.com
CC: "H. Peter Anvin" <hpa(a)zytor.com>
CC: Ingo Molnar <mingo(a)redhat.com>
CC: Len Brown <lenb(a)kernel.org>
CC: linux-acpi(a)vger.kernel.org
CC: linux-edac <linux-edac(a)vger.kernel.org>
CC: linux-nvdimm(a)lists.01.org
CC: Qiuxu Zhuo <qiuxu.zhuo(a)intel.com>
CC: "Rafael J. Wysocki" <rjw(a)rjwysocki.net>
CC: Ross Zwisler <zwisler(a)kernel.org>
CC: stable <stable(a)vger.kernel.org>
CC: Thomas Gleixner <tglx(a)linutronix.de>
CC: Tony Luck <tony.luck(a)intel.com>
CC: x86-ml <x86(a)kernel.org>
CC: Yazen Ghannam <yazen.ghannam(a)amd.com>
Link: http://lkml.kernel.org/r/20181026003729.8420-2-vishal.l.verma@intel.com
Signed-off-by: Greg Kroah-Hartman <gregkh(a)linuxfoundation.org>
---
arch/x86/include/asm/mce.h | 1 +
arch/x86/kernel/cpu/mcheck/mce.c | 3 ++-
drivers/acpi/nfit/mce.c | 4 ++++
3 files changed, 7 insertions(+), 1 deletion(-)
--- a/arch/x86/include/asm/mce.h
+++ b/arch/x86/include/asm/mce.h
@@ -217,6 +217,7 @@ static inline int umc_normaddr_to_sysadd
int mce_available(struct cpuinfo_x86 *c);
bool mce_is_memory_error(struct mce *m);
bool mce_is_correctable(struct mce *m);
+int mce_usable_address(struct mce *m);
DECLARE_PER_CPU(unsigned, mce_exception_count);
DECLARE_PER_CPU(unsigned, mce_poll_count);
--- a/arch/x86/kernel/cpu/mcheck/mce.c
+++ b/arch/x86/kernel/cpu/mcheck/mce.c
@@ -489,7 +489,7 @@ static void mce_report_event(struct pt_r
* be somewhat complicated (e.g. segment offset would require an instruction
* parser). So only support physical addresses up to page granuality for now.
*/
-static int mce_usable_address(struct mce *m)
+int mce_usable_address(struct mce *m)
{
if (!(m->status & MCI_STATUS_ADDRV))
return 0;
@@ -509,6 +509,7 @@ static int mce_usable_address(struct mce
return 1;
}
+EXPORT_SYMBOL_GPL(mce_usable_address);
bool mce_is_memory_error(struct mce *m)
{
--- a/drivers/acpi/nfit/mce.c
+++ b/drivers/acpi/nfit/mce.c
@@ -29,6 +29,10 @@ static int nfit_handle_mce(struct notifi
if (!mce_is_memory_error(mce) || mce_is_correctable(mce))
return NOTIFY_DONE;
+ /* Verify the address reported in the MCE is valid. */
+ if (!mce_usable_address(mce))
+ return NOTIFY_DONE;
+
/*
* mce->addr contains the physical addr accessed that caused the
* machine check. We need to walk through the list of NFITs, and see
Patches currently in stable-queue which might be from vishal.l.verma(a)intel.com are
queue-4.18/acpi-nfit-x86-mce-validate-a-mce-s-address-before-using-it.patch
queue-4.18/acpi-nfit-x86-mce-handle-only-uncorrectable-machine-checks.patch
2 years, 2 months