From: "Aneesh Kumar K.V" <aneesh.kumar@linux.ibm.com>
To: linuxppc-dev@lists.ozlabs.org, mpe@ellerman.id.au,
linux-nvdimm@lists.01.org, dan.j.williams@intel.com
Cc: "Aneesh Kumar K.V" <aneesh.kumar@linux.ibm.com>
Subject: [RFC PATCH 2/2] powerpc/pmem: Disable synchronous fault by default.
Date: Fri, 29 May 2020 11:11:40 +0530 [thread overview]
Message-ID: <20200529054141.156384-2-aneesh.kumar@linux.ibm.com> (raw)
In-Reply-To: <20200529054141.156384-1-aneesh.kumar@linux.ibm.com>
This adds a kernel config option that controls whether MAP_SYNC is enabled by
default. With POWER10, architecture is adding new pmem flush and sync
instructions. The kernel should prevent the usage of MAP_SYNC if applications
are not using the new instructions on newer hardware.
This config allows user to control whether MAP_SYNC should be enabled by
default or not.
Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.ibm.com>
---
arch/powerpc/platforms/Kconfig.cputype | 9 +++++++++
1 file changed, 9 insertions(+)
diff --git a/arch/powerpc/platforms/Kconfig.cputype b/arch/powerpc/platforms/Kconfig.cputype
index 27a81c291be8..f8694838ad4e 100644
--- a/arch/powerpc/platforms/Kconfig.cputype
+++ b/arch/powerpc/platforms/Kconfig.cputype
@@ -383,6 +383,15 @@ config PPC_KUEP
If you're unsure, say Y.
+config ARCH_MAP_SYNC_DISABLE
+ bool "Disable synchronous fault support (MAP_SYNC)"
+ default y
+ help
+ Disable support for synchronous fault with nvdimm namespaces.
+
+ If you're unsure, say Y.
+
+
config PPC_HAVE_KUAP
bool
--
2.26.2
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WARNING: multiple messages have this Message-ID (diff)
From: "Aneesh Kumar K.V" <aneesh.kumar@linux.ibm.com>
To: linuxppc-dev@lists.ozlabs.org, mpe@ellerman.id.au,
linux-nvdimm@lists.01.org, dan.j.williams@intel.com
Cc: "Aneesh Kumar K.V" <aneesh.kumar@linux.ibm.com>, oohall@gmail.com
Subject: [RFC PATCH 2/2] powerpc/pmem: Disable synchronous fault by default.
Date: Fri, 29 May 2020 11:11:40 +0530 [thread overview]
Message-ID: <20200529054141.156384-2-aneesh.kumar@linux.ibm.com> (raw)
In-Reply-To: <20200529054141.156384-1-aneesh.kumar@linux.ibm.com>
This adds a kernel config option that controls whether MAP_SYNC is enabled by
default. With POWER10, architecture is adding new pmem flush and sync
instructions. The kernel should prevent the usage of MAP_SYNC if applications
are not using the new instructions on newer hardware.
This config allows user to control whether MAP_SYNC should be enabled by
default or not.
Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.ibm.com>
---
arch/powerpc/platforms/Kconfig.cputype | 9 +++++++++
1 file changed, 9 insertions(+)
diff --git a/arch/powerpc/platforms/Kconfig.cputype b/arch/powerpc/platforms/Kconfig.cputype
index 27a81c291be8..f8694838ad4e 100644
--- a/arch/powerpc/platforms/Kconfig.cputype
+++ b/arch/powerpc/platforms/Kconfig.cputype
@@ -383,6 +383,15 @@ config PPC_KUEP
If you're unsure, say Y.
+config ARCH_MAP_SYNC_DISABLE
+ bool "Disable synchronous fault support (MAP_SYNC)"
+ default y
+ help
+ Disable support for synchronous fault with nvdimm namespaces.
+
+ If you're unsure, say Y.
+
+
config PPC_HAVE_KUAP
bool
--
2.26.2
next prev parent reply other threads:[~2020-05-29 5:42 UTC|newest]
Thread overview: 40+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-05-29 5:41 [RFC PATCH 1/2] libnvdimm: Add prctl control for disabling synchronous fault support Aneesh Kumar K.V
2020-05-29 5:41 ` Aneesh Kumar K.V
2020-05-29 5:41 ` Aneesh Kumar K.V [this message]
2020-05-29 5:41 ` [RFC PATCH 2/2] powerpc/pmem: Disable synchronous fault by default Aneesh Kumar K.V
2020-05-29 9:33 ` [RFC PATCH 1/2] libnvdimm: Add prctl control for disabling synchronous fault support Michal Suchánek
2020-05-29 9:33 ` Michal Suchánek
2020-05-29 9:37 ` Aneesh Kumar K.V
2020-05-29 9:37 ` Aneesh Kumar K.V
2020-05-29 9:52 ` Jan Kara
2020-05-29 9:52 ` Jan Kara
2020-05-29 10:55 ` Aneesh Kumar K.V
2020-05-29 10:55 ` Aneesh Kumar K.V
2020-05-29 19:22 ` Dan Williams
2020-05-29 19:22 ` Dan Williams
2020-05-30 7:18 ` Aneesh Kumar K.V
2020-05-30 7:18 ` Aneesh Kumar K.V
2020-05-30 16:35 ` Dan Williams
2020-05-30 16:35 ` Dan Williams
2020-06-01 9:50 ` Jan Kara
2020-06-01 9:50 ` Jan Kara
2020-06-02 17:59 ` Williams, Dan J
2020-06-02 17:59 ` Williams, Dan J
2020-06-03 8:26 ` Jan Kara
2020-06-03 8:26 ` Jan Kara
2020-06-03 9:09 ` Aneesh Kumar K.V
2020-06-03 9:09 ` Aneesh Kumar K.V
2020-06-08 7:42 ` Aneesh Kumar K.V
2020-06-08 7:42 ` Aneesh Kumar K.V
2020-06-01 10:09 ` Jan Kara
2020-06-01 10:09 ` Jan Kara
2020-06-01 12:01 ` Aneesh Kumar K.V
2020-06-01 12:01 ` Aneesh Kumar K.V
2020-06-01 12:07 ` Michal Suchánek
2020-06-01 12:07 ` Michal Suchánek
2020-06-01 12:20 ` Aneesh Kumar K.V
2020-06-01 12:20 ` Aneesh Kumar K.V
2020-06-02 7:57 ` Aneesh Kumar K.V
2020-06-02 7:57 ` Aneesh Kumar K.V
2020-06-01 14:56 ` Jan Kara
2020-06-01 14:56 ` Jan Kara
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