On 17/04/2020 17:58, Christoph Hellwig wrote:
> On Wed, Apr 15, 2020 at 09:21:37PM +1000, Alexey Kardashevskiy wrote:
>> And the fact they were exported leaves possibility that there is a
>> driver somewhere relying on these symbols or distro kernel won't build
>> because the symbol disappeared
Paolo Bonzini, any opinion on this?
Thanks and best,
Tianjia
On 2020/4/27 12:35, Tianjia Zhang wrote:
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
generate an compiler error but it doesn't. If it did we could
> detect these incorrect inclusion orders.
>
>>> #endif
>>>
>>> And the various arch headers do
>>>
>>> static inline void arch_clear_hugepage_flags(struct page *page)
>>>
Reviewed-by: Alistair Popple
On Friday, 1 May 2020 1:42:14 PM AEST Jordan Niethe wrote:
> Add the BOUNDARY SRR1 bit definition for when the cause of an alignment
> exception is a prefixed instruction that crosses a 64-byte boundary.
> Add the PREFIXED SRR1 bit definition for exceptions caused by
I guess this could change if there were prefixed branch instructions, but there
aren't so:
Reviewed-by: Alistair Popple
On Friday, 1 May 2020 1:42:12 PM AEST Jordan Niethe wrote:
> test_translate_branch() uses two pointers to instructions within a
> buffer, p and q, to test patch_branch(). The
I can't see any side-effects from patching both instructions at the same time.
Reviewed-by: Alistair Popple
On Friday, 1 May 2020 1:42:11 PM AEST Jordan Niethe wrote:
> When a new breakpoint is created, the second instruction of that
> breakpoint is patched with a trap instruction. This assumes
Shouldn't change anything and will be correct once prefix instructions are
defined.
Reviewed-by: Alistair Popple
On Friday, 1 May 2020 1:42:10 PM AEST Jordan Niethe wrote:
> Currently in xmon, mread() is used for reading instructions. In
> preparation for prefixed instructions, create and use
Looks good,
Reviewed-by: Alistair Popple
On Friday, 1 May 2020 1:42:09 PM AEST Jordan Niethe wrote:
> Currently all instructions have the same length, but in preparation for
> prefixed instructions introduce a function for returning instruction
> length.
>
> Signed-off-by: Jordan Niethe
> ---
Doesn't change any behaviour from what I can see.
Reviewed-by: Alistair Popple
On Friday, 1 May 2020 1:42:08 PM AEST Jordan Niethe wrote:
> Define specific __get_user_instr() and __get_user_instr_inatomic()
> macros for reading instructions from user space.
>
> Signed-off-by: Jordan Niethe
>
Without CONFIG_STRICT_KERNEL_RWX this boils down to doing the same thing
(although with a few more safety checks along the way), and with
CONFIG_STRICT_KERNEL_RWX this should make it actually work (although perhaps
there was some other mechanism that made it work anyway).
Reviewed-by: Alistair
On Mon, May 04, 2020 at 10:02:25PM +0100, Al Viro wrote:
> On Mon, May 04, 2020 at 01:17:41PM -0700, Ira Weiny wrote:
>
> > > || * arm: much, much worse. We have several files that pull
> > > linux/highmem.h:
> > > || arch/arm/mm/cache-feroceon-l2.c, arch/arm/mm/cache-xsc3l2.c,
> > > ||
On 5/4/20 4:03 AM, Emanuele Giuseppe Esposito wrote:
> diff --git a/fs/Kconfig b/fs/Kconfig
> index f08fbbfafd9a..1b0de0f19e96 100644
> --- a/fs/Kconfig
> +++ b/fs/Kconfig
> @@ -328,4 +328,10 @@ source "fs/unicode/Kconfig"
> config IO_WQ
> bool
>
> +config STATS_FS
> + bool
randconfig-a001-20200503
sparc64 randconfig-a001-20200503
s390 randconfig-a001-20200504
xtensa randconfig-a001-20200504
sh randconfig-a001-20200504
openrisc randconfig-a001-20200504
csky randconfig-a001
Add support for ima buffer pass using reserved memory for
arm64 kexec. Update the arch sepcific code path in kexec file load to store
the ima buffer in the reserved memory. The same reserved memory is read on
kexec or cold boot.
Signed-off-by: Prakhar Srivastava
---
arch/arm64/Kconfig
IMA during kexec(kexec file load) verifies the kernel signature and measures
the signature of the kernel. The signature in the logs can be used to verfiy
the
authenticity of the kernel. The logs don not get carried over kexec and thus
remote attesation cannot verify the signature of the running
Introduce a device tree layer for to read and store ima buffer
from the reserved memory section of a device tree.
Signed-off-by: Prakhar Srivastava
---
drivers/of/Kconfig | 6 ++
drivers/of/Makefile | 1 +
drivers/of/of_ima.c | 165
On Fri, May 01, 2020 at 04:12:04PM +0800, Shengjiu Wang wrote:
> Introduce a SoC specific data structure which contains the
> differences between the different SoCs.
> This makes it easier to support more differences without having
> to introduce a new if/else each time.
>
> Signed-off-by:
On Mon, May 04, 2020 at 01:17:41PM -0700, Ira Weiny wrote:
> > || * arm: much, much worse. We have several files that pull
> > linux/highmem.h:
> > || arch/arm/mm/cache-feroceon-l2.c, arch/arm/mm/cache-xsc3l2.c,
> > || arch/arm/mm/copypage-*.c, arch/arm/mm/dma-mapping.c, arch/arm/mm/flush.c,
>
On Mon, May 04, 2020 at 01:18:51PM +0200, Daniel Vetter wrote:
> On Mon, May 4, 2020 at 3:09 AM wrote:
> >
> > From: Ira Weiny
> >
> > kmap_atomic_prot() is now exported by all architectures. Use this
> > function rather than open coding a driver specific kmap_atomic.
> >
> > Reviewed-by:
On Mon, May 04, 2020 at 06:33:57AM +0100, Al Viro wrote:
> On Sun, May 03, 2020 at 10:04:47PM -0700, Ira Weiny wrote:
>
> > Grepping for 'asm/highmem.h' and investigations don't reveal any issues...
> > But
> > you do have me worried. That said 0-day has been crunching on multiple
> > versions
On Sun, May 03, 2020 at 11:43:00AM -0700, Guenter Roeck wrote:
> On Sun, May 03, 2020 at 10:41:38AM -0700, Guenter Roeck wrote:
> > Hi,
> >
> > On Wed, Apr 29, 2020 at 03:11:23PM +0300, Mike Rapoport wrote:
> > > From: Mike Rapoport
> > >
> > > Some architectures (e.g. ARC) have the
Hi Wang,
Thank you for the patch! Perhaps something to improve:
[auto build test WARNING on char-misc/char-misc-testing]
[also build test WARNING on arm-soc/for-next linus/master linux/master v5.7-rc3
next-20200501]
[if your patch is applied to the wrong git tree, please drop us a note to help
tree/branch: https://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux.git
merge
branch HEAD: 1bc92fe3175eb26ff37e580c0383d7a9abe06835 Automatic merge of
branches 'master', 'next' and 'fixes' into merge
elapsed time: 5894m
configs tested: 248
configs skipped: 0
The following configs
Returning from an interrupt or syscall to a signal handler currently
begins execution directly at the handler's entry point, with LR set to
the address of the sigreturn trampoline. When the signal handler
function returns, it runs the trampoline. It looks like this:
# interrupt at user
powerpc mantainers,
are you going to pick this up for the next -rc1? I'm waiting for it to
hit upstream before resending the coredump series.
On Wed, Apr 29, 2020 at 03:03:02PM +0800, Jeremy Kerr wrote:
> Currently, we may perform a copy_to_user (through
> simple_read_from_buffer()) while
The idea behind this prefetch was to kick off a page table walk before
returning from the fault, getting some pipelining advantage.
But this never showed up any noticable performance advantage, and in
fact with KUAP the prefetches are actually blocked and cause some
kind of micro-architectural
On Mon, May 4, 2020 at 3:09 AM wrote:
>
> From: Ira Weiny
>
> kmap_atomic_prot() is now exported by all architectures. Use this
> function rather than open coding a driver specific kmap_atomic.
>
> Reviewed-by: Christian König
> Reviewed-by: Christoph Hellwig
> Signed-off-by: Ira Weiny
I'm
Use stats_fs API instead of debugfs to create sources and add values.
This also requires to change all architecture files to replace the old
debugfs_entries with stats_fs_vcpu_entries and statsfs_vm_entries.
The files/folders name and organization is kept unchanged, and a symlink
in
Add virtual fs that maps stats_fs sources with directories, and values
(simple or aggregates) to files.
Every time a file is read/cleared, the fs internally invokes the stats_fs
API to get/set the requested value.
fs/stats_fs/inode.c is pretty much similar to what is done in
fs/debugfs/inode.c,
Add kunit tests to extensively test the stats_fs API functionality.
In order to run them, the kernel .config must set CONFIG_KUNIT=y
and a new .kunitconfig file must be created with CONFIG_STATS_FS=y
and CONFIG_STATS_FS_TEST=y
Tests can be then started by running the following command from the
There is currently no common way for Linux kernel subsystems to expose
statistics to userspace shared throughout the Linux kernel; subsystems
have to take care of gathering and displaying statistics by themselves,
for example in the form of files in debugfs. For example KVM has its own
code
Introduction to the stats_fs API, that allows to easily create, add
and remove stats_fs sources and values. The API allows to easily building
the statistics directory tree to automatically gather them for the linux
kernel. The main functionalities are: create a source, add child
Similar to the existing functions that take a mutex or spinlock if and
only if a reference count is decremented to zero, these new function
take an rwsem for writing just before the refcount reaches 0 (and
call a user-provided function in the case of kref_put_rwsem).
These will be used for
Wolfram Sang writes:
> My 'pengutronix' address is defunct for years. Merge the entries and use
> the proper contact address.
Is there any point adding the new address? It's just likely to bit-rot
one day too.
I figure the git history is a better source for more up-to-date emails.
cheers
>
Hugh Dickins writes:
> On Sun, 3 May 2020, Michael Ellerman wrote:
>
>> Hugh reported that his trusty G5 crashed after a few hours under load
>> with an "Unrecoverable exception 380".
>>
>> The crash is in interrupt_return() where we check lazy_irq_pending(),
>> which calls get_paca() and with
Eric Biggers writes:
> From: Eric Biggers
>
> The PowerPC implementation of SHA-1 doesn't actually use the 16-word
> temporary array that's passed to the assembly code. This was probably
> meant to correspond to the 'W' array that lib/sha1.c uses. However, in
> sha1-powerpc-asm.S these values
On Thu 30-04-20 12:48:20, Srikar Dronamraju wrote:
> * Michal Hocko [2020-04-29 14:22:11]:
>
> > On Wed 29-04-20 07:11:45, Srikar Dronamraju wrote:
> > > > >
> > > > > By marking, N_ONLINE as NODE_MASK_NONE, lets stop assuming that Node
> > > > > 0 is
> > > > > always online.
> > > > >
> > >
> @@ -524,7 +524,10 @@ __ftrace_make_call(struct dyn_ftrace *rec, unsigned
> long addr) struct module *mod = rec->arch.mod;
>
> /* read where this goes */
> - if (probe_kernel_read(op, ip, sizeof(op)))
> + if (probe_kernel_read_inst(op, ip))
> + return -EFAULT;
> +
> +
This option increases the number of hash misses by limiting the number of
kernel HPT entries, by accessing the address immediately after installing
the PTE, then removing it again (except in the case of CI entries that
must not be accessed, these are removed on the next hash fault).
This helps
This option increases the number of SLB misses by limiting the number of
kernel SLB entries, and increased flushing of cached lookaside information.
This helps stress test difficult to hit paths in the kernel.
Signed-off-by: Nicholas Piggin
---
v2:
- Address some comments from Aneesh about
Thanks for looking into this patch Mpe,
Michael Ellerman writes:
> Vaibhav Jain writes:
>
>> Add documentation to 'papr_hcalls.rst' describing the bitmap flags
>> that are returned from H_SCM_HEALTH hcall as per the PAPR-SCM
>> specification.
>>
>> Cc: Dan Williams
>> Cc: Michael Ellerman
>>
Looks good.
Reviewed-by: Alistair Popple
On Friday, 1 May 2020 1:42:05 PM AEST Jordan Niethe wrote:
> Introduce a probe_user_read_inst() function to use in cases where
> probe_user_read() is used for getting an instruction. This will be more
> useful for prefixed instructions.
>
>
> diff --git a/arch/powerpc/kernel/uprobes.c b/arch/powerpc/kernel/uprobes.c
> index 31c870287f2b..6893d40a48c5 100644
> --- a/arch/powerpc/kernel/uprobes.c
> +++ b/arch/powerpc/kernel/uprobes.c
> @@ -174,7 +174,7 @@ bool arch_uprobe_skip_sstep(struct arch_uprobe *auprobe,
> struct pt_regs *regs)
Excerpts from Aneesh Kumar K.V's message of May 4, 2020 5:27 pm:
> Nicholas Piggin writes:
>
>> This option increases the number of SLB misses by limiting the number of
>> kernel SLB entries, and increased flushing of cached lookaside information.
>> This helps stress test difficult to hit paths
Excerpts from Aneesh Kumar K.V's message of May 4, 2020 5:36 pm:
> Nicholas Piggin writes:
>
>> This option increases the number of hash misses by limiting the number of
>> kernel HPT entries. This helps stress test difficult to hit paths in the
>> kernel.
>>
>
> It would nice if we can explain
Looks good to me in that it doesn't look to change the behaviour of any
existing code.
Reviewed-by: Alistair Popple
On Friday, 1 May 2020 1:42:00 PM AEST Jordan Niethe wrote:
> In preparation for using a data type for instructions that can not be
> directly used with the '>>' operator use a
Nicholas Piggin writes:
> This option increases the number of hash misses by limiting the number of
> kernel HPT entries. This helps stress test difficult to hit paths in the
> kernel.
>
It would nice if we can explain in commit message how we are limiting
the number of HPT entries.
>
On Mon, May 4, 2020 at 9:24 AM Geert Uytterhoeven wrote:
> JFYI, when comparing v5.7-rc4[1] to v5.7-rc3[3], the summaries are:
> - build errors: +3/-123
> [1]
> http://kisskb.ellerman.id.au/kisskb/branch/linus/head/0e698dfa282211e414076f9dc7e83c1c288314fd/
> (all 239 configs)
> [3]
>
Nicholas Piggin writes:
> This option increases the number of SLB misses by limiting the number of
> kernel SLB entries, and increased flushing of cached lookaside information.
> This helps stress test difficult to hit paths in the kernel.
>
> Signed-off-by: Nicholas Piggin
> +{
> +
On 3/30/20 12:42 PM, Ganesh Goudar wrote:
From: Santosh S
Introduce notification chain which lets know about uncorrected memory
errors(UE). This would help prospective users in pmem or nvdimm subsystem
to track bad blocks for better handling of persistent memory allocations.
Signed-off-by:
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