On 5/28/20 7:13 AM, Paul Mackerras wrote:
On Tue, May 05, 2020 at 12:47:16PM +0530, Aneesh Kumar K.V wrote:
The locking rules for walking partition scoped table is different from process
scoped table. Hence add a helper for secondary linux page table walk and also
add check whether we are
In the current kvm version, 'kvm_run' has been included in the 'kvm_vcpu'
structure. For historical reasons, many kvm-related function parameters
retain the 'kvm_run' and 'kvm_vcpu' parameters at the same time. This
patch does a unified cleanup of these remaining redundant parameters.
On Thu, May 28, 2020 at 11:31:04AM +0530, Aneesh Kumar K.V wrote:
> On 5/28/20 7:13 AM, Paul Mackerras wrote:
> > On Tue, May 05, 2020 at 12:47:16PM +0530, Aneesh Kumar K.V wrote:
> > > The locking rules for walking partition scoped table is different from
> > > process
> > > scoped table. Hence
This patch fix the below warning reported during migration.
find_kvm_secondary_pte called with kvm mmu_lock not held
CPU: 23 PID: 5341 Comm: qemu-system-ppc Tainted: GW
5.7.0-rc5-kvm-00211-g9ccf10d6d088 #432
NIP: c00800fe848c LR: c00800fe8488 CTR:
Excerpts from Michael Ellerman's message of May 28, 2020 12:58 am:
> __init_FSCR() was added originally in commit 2468dcf641e4 ("powerpc:
> Add support for context switching the TAR register") (Feb 2013), and
> only set FSCR_TAR.
>
> At that point FSCR (Facility Status and Control Register) was
On Thu 2020-05-28 11:03:43, Michael Ellerman wrote:
> Petr Mladek writes:
> > The commit 0ebeea8ca8a4d1d453a ("bpf: Restrict bpf_probe_read{, str}() only
> > to archs where they work") caused that bpf_probe_read{, str}() functions
> > were not longer available on architectures where the same
From: Valentin Longchamp
[ Upstream commit 79dde73cf9bcf1dd317a2667f78b758e9fe139ed ]
ugeth_quiesce/activate are used to halt the controller when there is a
link change that requires to reconfigure the mac.
The previous implementation called netif_device_detach(). This however
causes the
From: Valentin Longchamp
[ Upstream commit 79dde73cf9bcf1dd317a2667f78b758e9fe139ed ]
ugeth_quiesce/activate are used to halt the controller when there is a
link change that requires to reconfigure the mac.
The previous implementation called netif_device_detach(). This however
causes the
From: Valentin Longchamp
[ Upstream commit 79dde73cf9bcf1dd317a2667f78b758e9fe139ed ]
ugeth_quiesce/activate are used to halt the controller when there is a
link change that requires to reconfigure the mac.
The previous implementation called netif_device_detach(). This however
causes the
From: Valentin Longchamp
[ Upstream commit 79dde73cf9bcf1dd317a2667f78b758e9fe139ed ]
ugeth_quiesce/activate are used to halt the controller when there is a
link change that requires to reconfigure the mac.
The previous implementation called netif_device_detach(). This however
causes the
Petr Mladek writes:
> On Thu 2020-05-28 11:03:43, Michael Ellerman wrote:
>> Petr Mladek writes:
>> > The commit 0ebeea8ca8a4d1d453a ("bpf: Restrict bpf_probe_read{, str}() only
>> > to archs where they work") caused that bpf_probe_read{, str}() functions
>> > were not longer available on
Mapping of early shadow area is implemented by using a single static
page table having all entries pointing to the same early shadow page.
The shadow area must therefore occupy full PGD entries.
The shadow area has a size of 128Mbytes starting at 0xf800.
With 4k pages, a PGD entry is 4Mbytes
From: Valentin Longchamp
[ Upstream commit 79dde73cf9bcf1dd317a2667f78b758e9fe139ed ]
ugeth_quiesce/activate are used to halt the controller when there is a
link change that requires to reconfigure the mac.
The previous implementation called netif_device_detach(). This however
causes the
From: Valentin Longchamp
[ Upstream commit 79dde73cf9bcf1dd317a2667f78b758e9fe139ed ]
ugeth_quiesce/activate are used to halt the controller when there is a
link change that requires to reconfigure the mac.
The previous implementation called netif_device_detach(). This however
causes the
"Aneesh Kumar K.V" writes:
> This patch fix the below warning reported during migration.
>
> find_kvm_secondary_pte called with kvm mmu_lock not held
> CPU: 23 PID: 5341 Comm: qemu-system-ppc Tainted: GW
> 5.7.0-rc5-kvm-00211-g9ccf10d6d088 #432
> NIP: c00800fe848c LR:
"Athira Rajeev" wrote on 27/05/2020 03:20:18
PM:
> From: "Athira Rajeev"
> To: linuxppc-dev@lists.ozlabs.org
> Cc: linux-ker...@vger.kernel.org, ravi.bango...@linux.ibm.com,
> ma...@linux.vnet.ibm.com, a...@kernel.org, a...@linux.vnet.ibm.com,
> jo...@kernel.org, m...@ellerman.id.au,
"Linuxppc-dev" wrote on 27/05/2020 03:20:17
PM:
> From: "Athira Rajeev"
> To: linuxppc-dev@lists.ozlabs.org
> Cc: ravi.bango...@linux.ibm.com, atraj...@linux.vnet.ibm.com,
> ma...@linux.vnet.ibm.com, linux-ker...@vger.kernel.org,
> a...@kernel.org, a...@linux.vnet.ibm.com, jo...@kernel.org
>
On 5/28/20 6:23 PM, Michael Ellerman wrote:
"Aneesh Kumar K.V" writes:
This patch fix the below warning reported during migration.
find_kvm_secondary_pte called with kvm mmu_lock not held
CPU: 23 PID: 5341 Comm: qemu-system-ppc Tainted: GW
Jordan Niethe writes:
> On Tue, May 26, 2020 at 4:36 PM Michael Ellerman wrote:
>>
>> The last caller was removed in 2014 in commit fb5a515704d7 ("powerpc:
>> Remove platforms/wsp and associated pieces").
>>
>> Once generic_secondary_thread_init() is removed there are no longer
>> any uses of
Hi Zong,
Le 5/27/20 à 3:29 AM, Alex Ghiti a écrit :
Le 5/27/20 à 2:05 AM, Zong Li a écrit :
On Wed, May 27, 2020 at 1:06 AM Alex Ghiti wrote:
Hi Zong,
Le 5/26/20 à 5:43 AM, Zong Li a écrit :
On Sun, May 24, 2020 at 4:54 PM Alexandre Ghiti wrote:
This is a preparatory patch for
On Wed, 20 May 2020 23:36:05 +1000, Michael Ellerman wrote:
> Several strange crashes have been eventually traced back to
> STRICT_KERNEL_RWX and its interaction with code patching.
>
> Various paths in our ftrace, kprobes and other patching code need to
> be hardened against patching failures,
On Tue, 26 May 2020 16:18:08 +1000, Michael Ellerman wrote:
> Commit 702f09805222 ("powerpc/64s/exception: Remove lite interrupt
> return") changed the interrupt return path to not restore non-volatile
> registers by default, and explicitly restore them in paths where it is
> required.
>
> But it
Cédric Le Goater writes:
> On 4/29/20 9:51 AM, Cédric Le Goater wrote:
>> When a passthrough IO adapter is removed from a pseries machine using
>> hash MMU and the XIVE interrupt mode, the POWER hypervisor, pHyp,
>> expects the guest OS to have cleared all page table entries related to
>> the
On 5/28/20 2:23 PM, Michael Ellerman wrote:
Petr Mladek writes:
On Thu 2020-05-28 11:03:43, Michael Ellerman wrote:
Petr Mladek writes:
The commit 0ebeea8ca8a4d1d453a ("bpf: Restrict bpf_probe_read{, str}() only
to archs where they work") caused that bpf_probe_read{, str}() functions
were
VNIC protocol version is reported in big-endian format, but it
is not byteswapped before logging. Fix that, and remove version
comparison as only one protocol version exists at this time.
Signed-off-by: Thomas Falcon
---
drivers/net/ethernet/ibm/ibmvnic.c | 8 +++-
1 file changed, 3
Nathan Chancellor writes:
> A 0day randconfig uncovered an error with clang, trimmed for brevity:
>
> arch/powerpc/platforms/embedded6xx/wii.c:195:7: error: attribute
> declaration must precede definition [-Werror,-Wignored-attributes]
> if (!machine_is(wii))
> ^
>
> The
On Wed, 20 May 2020 10:23:45 + (UTC), Christophe Leroy wrote:
> This reverts commit 697ece78f8f749aeea40f2711389901f0974017a.
>
> The implementation of SWAP on powerpc requires page protection
> bits to not be one of the least significant PTE bits.
>
> Until the SWAP implementation is
Thanks for looking into this patchset Dan,
Dan Williams writes:
> On Tue, May 26, 2020 at 9:13 PM Vaibhav Jain wrote:
>>
>> Add documentation to 'papr_hcalls.rst' describing the bitmap flags
>> that are returned from H_SCM_HEALTH hcall as per the PAPR-SCM
>> specification.
>>
>
> Please do a
Currently when we boot on a big core system, we get this print:
[0.040500] Using small cores at SMT level
This is misleading as we've actually detected big cores.
This patch clears up the print to say we've detect big cores but are
using small cores for scheduling.
Signed-off-by: Michael
Hi Sandipan,
A few comments below ...
Sandipan Das writes:
> Apart from read and write access, memory protection keys can
> also be used for restricting execute permission of pages on
> powerpc. This adds a test to verify if the feature works as
> expected.
>
> Signed-off-by: Sandipan Das
>
Yi Wang writes:
> From: Liao Pingfang
>
> Use kzalloc instead of kmalloc in the error message according to
> the previous kzalloc() call.
Please just remove the message instead, it's a tiny allocation that's
unlikely to ever fail, and the caller will print an error anyway.
cheers
> diff --git
On Fri, 2020-04-03 at 07:20:50 UTC, Christophe Leroy wrote:
> Some architectures like powerpc64 have the capability to separate
> read access and write access protection.
> For get_user() and copy_from_user(), powerpc64 only open read access.
> For put_user() and copy_to_user(), powerpc64 only
On Thu, 2020-05-07 at 12:33:24 UTC, Michael Ellerman wrote:
> The "m<>" constraint breaks compilation with GCC 4.6.x era compilers.
>
> The use of the constraint allows the compiler to use update-form
> instructions, however in practice current compilers never generate
> those forms for any of
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 patch adds a prctl option MAP_SYNC_ENABLE that can be used to enable
the usage of MAP_SYNC. The
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
We only support persistent memory on P8 and above. This is enforced by the
firmware and further checked on virtualzied platform during platform init.
Add WARN_ONCE in pmem flush routines to catch the wrong usage of these.
Signed-off-by: Aneesh Kumar K.V
---
arch/powerpc/include/asm/cacheflush.h
With kernel now supporting new pmem flush/sync instructions, we can now
enable the kernel to initialize the device. On P10 these devices would
appear with a new compatible string. For PAPR device we have
compatible "ibm,pmemory-v2"
and for OF pmem device we have
compatible
nvdimm expect the flush routines to just mark the cache clean. The barrier
that mark the store globally visible is done in nvdimm_flush().
Update the papr_scm driver to a simplified nvdim_flush callback that do
only the required barrier.
Signed-off-by: Aneesh Kumar K.V
---
Architectures like ppc64 provide persistent memory specific barriers
that will ensure that all stores for which the modifications are
written to persistent storage by preceding dcbfps and dcbstps
instructions have updated persistent storage before any data
access or data transfer caused by
Start using dcbstps; phwsync; sequence for flushing persistent memory range.
The new instructions are implemented as a variant of dcbf and hwsync and on
P8 and P9 they will be executed as those instructions. We avoid using them on
older hardware. This helps to avoid difficult to debug bugs.
of_pmem on POWER10 can now use phwsync instead of hwsync to ensure
all previous writes are architecturally visible for the platform
buffer flush.
Signed-off-by: Aneesh Kumar K.V
---
arch/powerpc/include/asm/cacheflush.h | 7 +++
1 file changed, 7 insertions(+)
diff --git
tree/branch: https://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux.git
next-test
branch HEAD: bc26d22277c297c35013700e40f276e37b991980 powerpc/pseries: Update
hv-24x7 information after migration
Warning in current branch:
kernel/events/hw_breakpoint.c:216:12: warning: no previous
On Wed, May 27, 2020 at 12:48 AM wrote:
>
> From: Wen Xiong
>
> Several device drivers hit EEH(Extended Error handling) when triggering
> kdump on Pseries PowerVM. This patch implemented a reset of the PHBs
> in pci general code when triggering kdump. PHB reset stop all PCI
> transactions from
On Fri, 2020-04-17 at 17:08:52 UTC, Christophe Leroy wrote:
> At the time being, unsafe_copy_to_user() is based on
> raw_copy_to_user() which calls __copy_tofrom_user().
>
> __copy_tofrom_user() is a big optimised function to copy big amount
> of data. It aligns destinations to cache line in
The PAPR based virtualized persistent memory devices are only supported on
POWER9 and above. In the followup patch, the kernel will switch the persistent
memory cache flush functions to use a new `dcbf` variant instruction. The new
instructions even though added in ISA 3.1 works even on P8 and P9
POWER10 introduces two new variants of dcbf instructions (dcbstps and dcbfps)
that can be used to write modified locations back to persistent storage.
Additionally, POWER10 also introduce phwsync and plwsync which can be used
to establish order of these writes to persistent storage.
This patch
Daniel Borkmann writes:
> On 5/28/20 2:23 PM, Michael Ellerman wrote:
>> Petr Mladek writes:
>>> On Thu 2020-05-28 11:03:43, Michael Ellerman wrote:
Petr Mladek writes:
> The commit 0ebeea8ca8a4d1d453a ("bpf: Restrict bpf_probe_read{, str}()
> only
> to archs where they work")
On Fri, 2020-04-03 at 07:20:51 UTC, Christophe Leroy wrote:
> When opening user access to only perform reads, only open read access.
> When opening user access to only perform writes, only open write
> access.
>
> Signed-off-by: Christophe Leroy
> Reviewed-by: Kees Cook
Applied to powerpc
From: Liao Pingfang
Use kzalloc instead of kmalloc in the error message according to
the previous kzalloc() call.
Signed-off-by: Liao Pingfang
---
arch/powerpc/kernel/nvram_64.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/arch/powerpc/kernel/nvram_64.c
On Tue, May 26, 2020 at 08:21:59AM -0500, wenxi...@linux.vnet.ibm.com wrote:
> From: Wen Xiong
>
> Several device drivers hit EEH(Extended Error handling) when triggering
> kdump on Pseries PowerVM. This patch implemented a reset of the PHBs
> in pci general code when triggering kdump. PHB reset
On Fri, 2020-04-17 at 17:08:51 UTC, Christophe Leroy wrote:
> unsafe_put_user() is designed to take benefit of 'asm goto'.
>
> Instead of using the standard __put_user() approach and branch
> based on the returned error, use 'asm goto' and make the
> exception code branch directly to the error
On Tue, 2020-04-07 at 04:12:45 UTC, Nicholas Piggin wrote:
> get/put_user can be called with nontrivial arguments. fs/proc/page.c
> has a good example:
>
> if (put_user(stable_page_flags(ppage), out)) {
>
> stable_page_flags is quite a lot of code, including spin locks in the
> page
This patch series enables the usage os new pmem flush and sync instructions on
POWER
architecture. POWER10 introduces two new variants of dcbf instructions (dcbstps
and dcbfps)
that can be used to write modified locations back to persistent storage.
Additionally,
POWER10 also introduce phwsync
For what it's worth I tested this series on Mambo PowerNV and it seems to
correctly enable/disable the prefix FSCR bit based on the cpu feature so feel
free to add:
Tested-by: Alistair Popple
Mikey is going to test out pseries.
- Alistair
On Thursday, 28 May 2020 12:58:40 AM AEST Michael
On Fri, 2020-04-03 at 07:20:52 UTC, Christophe Leroy wrote:
> When i915_gem_execbuffer2_ioctl() is using user_access_begin(),
> that's only to perform unsafe_put_user() so use
> user_write_access_begin() in order to only open write access.
>
> Signed-off-by: Christophe Leroy
> Reviewed-by: Kees
On Fri, 2020-04-03 at 07:20:53 UTC, Christophe Leroy wrote:
> Add support for selective read or write user access with
> user_read_access_begin/end and user_write_access_begin/end.
>
> Signed-off-by: Christophe Leroy
> Reviewed-by: Kees Cook
Applied to powerpc topic/uaccess-ppc, thanks.
On Thu, 2020-02-20 at 08:15:06 UTC, =?UTF-8?q?C=C3=A9dric=20Le=20Goater?= wrote:
> When an interrupt has been handled, the OS notifies the interrupt
> controller with a EOI sequence. On a POWER9 system using the XIVE
> interrupt controller, this can be done with a load or a store
> operation on
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