On Fri, Apr 26, 2024 at 12:01:34PM -0700, Song Liu wrote:
> On Fri, Apr 26, 2024 at 1:30 AM Mike Rapoport wrote:
> >
> > From: "Mike Rapoport (IBM)"
> >
> > Extend execmem parameters to accommodate more complex overrides of
> > module_alloc() by archite
From: "Mike Rapoport (IBM)"
BPF just-in-time compiler depended on CONFIG_MODULES because it used
module_alloc() to allocate memory for the generated code.
Since code allocations are now implemented with execmem, drop dependency of
CONFIG_BPF_JIT on CONFIG_MODULES and make
From: "Mike Rapoport (IBM)"
kprobes depended on CONFIG_MODULES because it has to allocate memory for
code.
Since code allocations are now implemented with execmem, kprobes can be
enabled in non-modular kernels.
Add #ifdef CONFIG_MODULE guards for the code dealing with kprobes insi
From: "Mike Rapoport (IBM)"
There are places where CONFIG_MODULES guards the code that depends on
memory allocation being done with module_alloc().
Replace CONFIG_MODULES with CONFIG_EXECMEM in such places.
Signed-off-by: Mike Rapoport (IBM)
---
arch/powerpc/Kconfig
From: "Mike Rapoport (IBM)"
Dynamic ftrace must allocate memory for code and this was impossible
without CONFIG_MODULES.
With execmem separated from the modules code, execmem_text_alloc() is
available regardless of CONFIG_MODULES.
Remove dependency of dynamic ftrace on CONFIG_MODULE
From: "Mike Rapoport (IBM)"
execmem does not depend on modules, on the contrary modules use
execmem.
To make execmem available when CONFIG_MODULES=n, for instance for
kprobes, split execmem_params initialization out from
arch/*/kernel/module.c and compile it when CONFIG_EXECMEM=y
From: "Mike Rapoport (IBM)"
powerpc overrides kprobes::alloc_insn_page() to remove writable
permissions when STRICT_MODULE_RWX is on.
Add definition of EXECMEM_KRPOBES to execmem_params to allow using the
generic kprobes::alloc_insn_page() with the desired permissions.
As po
From: "Mike Rapoport (IBM)"
The memory allocations for kprobes and BPF on arm64 can be placed
anywhere in vmalloc address space and currently this is implemented with
overrides of alloc_insn_page() and bpf_jit_alloc_exec() in arm64.
Define EXECMEM_KPROBES and EXECMEM_BPF range
From: "Mike Rapoport (IBM)"
The memory allocations for kprobes and BPF on RISC-V are not placed in
the modules area and these custom allocations are implemented with
overrides of alloc_insn_page() and bpf_jit_alloc_exec().
Slightly reorder execmem_params initialization to suppo
From: "Mike Rapoport (IBM)"
Extend execmem parameters to accommodate more complex overrides of
module_alloc() by architectures.
This includes specification of a fallback range required by arm, arm64
and powerpc, EXECMEM_MODULE_DATA type required by powerpc, support for
allocatio
From: "Mike Rapoport (IBM)"
Several architectures override module_alloc() only to define address
range for code allocations different than VMALLOC address space.
Provide a generic implementation in execmem that uses the parameters for
address space ranges, required alignmen
From: "Mike Rapoport (IBM)"
module_alloc() is used everywhere as a mean to allocate memory for code.
Beside being semantically wrong, this unnecessarily ties all subsystems
that need to allocate code, such as ftrace, kprobes and BPF to modules and
puts the burden of code
From: "Mike Rapoport (IBM)"
Move the logic related to the memory allocation and freeing into
module_memory_alloc() and module_memory_free().
Signed-off-by: Mike Rapoport (IBM)
---
kernel/module/main.c | 64 +++-
1 file changed, 39 inserti
From: "Mike Rapoport (IBM)"
Define MODULES_VADDR and MODULES_END as VMALLOC_START and VMALLOC_END
for 32-bit and reduce module_alloc() to
__vmalloc_node_range(size, 1, MODULES_VADDR, MODULES_END, ...)
as with the new defines the allocations becomes identical for both 32
a
From: "Mike Rapoport (IBM)"
nios2 uses kmalloc() to implement module_alloc() because CALL26/PCREL26
cannot reach all of vmalloc address space.
Define module space as 32MiB below the kernel base and switch nios2 to
use vmalloc for module allocations.
Suggested-by: Thomas Gleix
From: "Mike Rapoport (IBM)"
and MODULE_END to MODULES_END to match other architectures that define
custom address space for modules.
Signed-off-by: Mike Rapoport (IBM)
---
arch/mips/include/asm/pgtable-64.h | 4 ++--
arch/mips/kernel/module.c | 4 ++--
arch/mips/
From: "Mike Rapoport (IBM)"
Since commit f6f37d9320a1 ("arm64: select KASAN_VMALLOC for SW/HW_TAGS
modes") KASAN_VMALLOC is always enabled when KASAN is on. This means
that allocations in module_alloc() will be tracked by KASAN protection
for vmalloc() and that kasan
From: "Mike Rapoport (IBM)"
Hi,
The patches are also available in git:
https://git.kernel.org/pub/scm/linux/kernel/git/rppt/linux.git/log/?h=execmem/v6
v6 changes:
* restore patch "arm64: extend execmem_info for generated code
allocations" that disappeared in v5 reb
X_MMU
+ select ARCH_WANTS_EXECMEM_EARLY if EXECMEM
select ARCH_WANTS_MODULES_DATA_IN_VMALLOC if PPC_BOOK3S_32 ||
PPC_8xx
select ARCH_WEAK_RELEASE_ACQUIRE
select BINFMT_ELF
> --
> Cheers,
> Stephen Rothwell
--
Sincerely yours,
Mike.
From: "Mike Rapoport (IBM)"
BPF just-in-time compiler depended on CONFIG_MODULES because it used
module_alloc() to allocate memory for the generated code.
Since code allocations are now implemented with execmem, drop dependency of
CONFIG_BPF_JIT on CONFIG_MODULES and make
From: "Mike Rapoport (IBM)"
kprobes depended on CONFIG_MODULES because it has to allocate memory for
code.
Since code allocations are now implemented with execmem, kprobes can be
enabled in non-modular kernels.
Add #ifdef CONFIG_MODULE guards for the code dealing with kprobes insi
From: "Mike Rapoport (IBM)"
There are places where CONFIG_MODULES guards the code that depends on
memory allocation being done with module_alloc().
Replace CONFIG_MODULES with CONFIG_EXECMEM in such places.
Signed-off-by: Mike Rapoport (IBM)
---
arch/powerpc/Kconfig
From: "Mike Rapoport (IBM)"
Dynamic ftrace must allocate memory for code and this was impossible
without CONFIG_MODULES.
With execmem separated from the modules code, execmem_text_alloc() is
available regardless of CONFIG_MODULES.
Remove dependency of dynamic ftrace on CONFIG_MODULE
From: "Mike Rapoport (IBM)"
execmem does not depend on modules, on the contrary modules use
execmem.
To make execmem available when CONFIG_MODULES=n, for instance for
kprobes, split execmem_params initialization out from
arch/*/kernel/module.c and compile it when CONFIG_EXECMEM=y
From: "Mike Rapoport (IBM)"
powerpc overrides kprobes::alloc_insn_page() to remove writable
permissions when STRICT_MODULE_RWX is on.
Add definition of EXECMEM_KRPOBES to execmem_params to allow using the
generic kprobes::alloc_insn_page() with the desired permissions.
As po
From: "Mike Rapoport (IBM)"
The memory allocations for kprobes and BPF on RISC-V are not placed in
the modules area and these custom allocations are implemented with
overrides of alloc_insn_page() and bpf_jit_alloc_exec().
Slightly reorder execmem_params initialization to suppo
From: "Mike Rapoport (IBM)"
Extend execmem parameters to accommodate more complex overrides of
module_alloc() by architectures.
This includes specification of a fallback range required by arm, arm64
and powerpc, EXECMEM_MODULE_DATA type required by powerpc, support for
allocatio
From: "Mike Rapoport (IBM)"
Several architectures override module_alloc() only to define address
range for code allocations different than VMALLOC address space.
Provide a generic implementation in execmem that uses the parameters for
address space ranges, required alignmen
From: "Mike Rapoport (IBM)"
module_alloc() is used everywhere as a mean to allocate memory for code.
Beside being semantically wrong, this unnecessarily ties all subsystems
that need to allocate code, such as ftrace, kprobes and BPF to modules and
puts the burden of code
From: "Mike Rapoport (IBM)"
Move the logic related to the memory allocation and freeing into
module_memory_alloc() and module_memory_free().
Signed-off-by: Mike Rapoport (IBM)
---
kernel/module/main.c | 64 +++-
1 file changed, 39 inserti
From: "Mike Rapoport (IBM)"
Define MODULES_VADDR and MODULES_END as VMALLOC_START and VMALLOC_END
for 32-bit and reduce module_alloc() to
__vmalloc_node_range(size, 1, MODULES_VADDR, MODULES_END, ...)
as with the new defines the allocations becames identical for both 32
a
From: "Mike Rapoport (IBM)"
nios2 uses kmalloc() to implement module_alloc() because CALL26/PCREL26
cannot reach all of vmalloc address space.
Define module space as 32MiB below the kernel base and switch nios2 to
use vmalloc for module allocations.
Suggested-by: Thomas Gleix
From: "Mike Rapoport (IBM)"
and MODULE_END to MODULES_END to match other architectures that define
custom address space for modules.
Signed-off-by: Mike Rapoport (IBM)
---
arch/mips/include/asm/pgtable-64.h | 4 ++--
arch/mips/kernel/module.c | 4 ++--
arch/mips/
From: "Mike Rapoport (IBM)"
Since commit f6f37d9320a1 ("arm64: select KASAN_VMALLOC for SW/HW_TAGS
modes") KASAN_VMALLOC is always enabled when KASAN is on. This means
that allocations in module_alloc() will be tracked by KASAN protection
for vmalloc() and that kasan
From: "Mike Rapoport (IBM)"
(something went wrong with the prevois posting, sorry for the noise)
Hi,
Since v3 I looked into making execmem more of an utility toolbox, as we
discussed at LPC with Mark Rutland, but it was getting more hairier than
having a struct describing ar
From: "Mike Rapoport (IBM)"
BPF just-in-time compiler depended on CONFIG_MODULES because it used
module_alloc() to allocate memory for the generated code.
Since code allocations are now implemented with execmem, drop dependency of
CONFIG_BPF_JIT on CONFIG_MODULES and make
From: "Mike Rapoport (IBM)"
kprobes depended on CONFIG_MODULES because it has to allocate memory for
code.
Since code allocations are now implemented with execmem, kprobes can be
enabled in non-modular kernels.
Add #ifdef CONFIG_MODULE guards for the code dealing with kprobes insi
From: "Mike Rapoport (IBM)"
There are places where CONFIG_MODULES guards the code that depends on
memory allocation being done with module_alloc().
Replace CONFIG_MODULES with CONFIG_EXECMEM in such places.
Signed-off-by: Mike Rapoport (IBM)
---
arch/powerpc/Kconfig
From: "Mike Rapoport (IBM)"
Dynamic ftrace must allocate memory for code and this was impossible
without CONFIG_MODULES.
With execmem separated from the modules code, execmem_text_alloc() is
available regardless of CONFIG_MODULES.
Remove dependency of dynamic ftrace on CONFIG_MODULE
From: "Mike Rapoport (IBM)"
execmem does not depend on modules, on the contrary modules use
execmem.
To make execmem available when CONFIG_MODULES=n, for instance for
kprobes, split execmem_params initialization out from
arch/*/kernel/module.c and compile it when CONFIG_EXECMEM=y
From: "Mike Rapoport (IBM)"
powerpc overrides kprobes::alloc_insn_page() to remove writable
permissions when STRICT_MODULE_RWX is on.
Add definition of EXECMEM_KRPOBES to execmem_params to allow using the
generic kprobes::alloc_insn_page() with the desired permissions.
As po
From: "Mike Rapoport (IBM)"
The memory allocations for kprobes and BPF on RISC-V are not placed in
the modules area and these custom allocations are implemented with
overrides of alloc_insn_page() and bpf_jit_alloc_exec().
Slightly reorder execmem_params initialization to suppo
From: "Mike Rapoport (IBM)"
Extend execmem parameters to accommodate more complex overrides of
module_alloc() by architectures.
This includes specification of a fallback range required by arm, arm64
and powerpc, EXECMEM_MODULE_DATA type required by powerpc, support for
allocatio
From: "Mike Rapoport (IBM)"
Several architectures override module_alloc() only to define address
range for code allocations different than VMALLOC address space.
Provide a generic implementation in execmem that uses the parameters for
address space ranges, required alignmen
From: "Mike Rapoport (IBM)"
module_alloc() is used everywhere as a mean to allocate memory for code.
Beside being semantically wrong, this unnecessarily ties all subsystems
that need to allocate code, such as ftrace, kprobes and BPF to modules and
puts the burden of code
From: "Mike Rapoport (IBM)"
Move the logic related to the memory allocation and freeing into
module_memory_alloc() and module_memory_free().
Signed-off-by: Mike Rapoport (IBM)
---
kernel/module/main.c | 64 +++-
1 file changed, 39 inserti
From: "Mike Rapoport (IBM)"
Define MODULES_VADDR and MODULES_END as VMALLOC_START and VMALLOC_END
for 32-bit and reduce module_alloc() to
__vmalloc_node_range(size, 1, MODULES_VADDR, MODULES_END, ...)
as with the new defines the allocations becames identical for both 32
a
From: "Mike Rapoport (IBM)"
nios2 uses kmalloc() to implement module_alloc() because CALL26/PCREL26
cannot reach all of vmalloc address space.
Define module space as 32MiB below the kernel base and switch nios2 to
use vmalloc for module allocations.
Suggested-by: Thomas Gleix
From: "Mike Rapoport (IBM)"
and MODULE_END to MODULES_END to match other architectures that define
custom address space for modules.
Signed-off-by: Mike Rapoport (IBM)
---
arch/mips/include/asm/pgtable-64.h | 4 ++--
arch/mips/kernel/module.c | 4 ++--
arch/mips/
From: "Mike Rapoport (IBM)"
Since commit f6f37d9320a1 ("arm64: select KASAN_VMALLOC for SW/HW_TAGS
modes") KASAN_VMALLOC is always enabled when KASAN is on. This means
that allocations in module_alloc() will be tracked by KASAN protection
for vmalloc() and that kasan
From: "Mike Rapoport (IBM)"
Hi,
Since v3 I looked into making execmem more of an utility toolbox, as we
discussed at LPC with Mark Rutland, but it was getting more hairier than
having a struct describing architecture constraints and a type identifying
the consumer of execmem.
And
On Sat, Apr 20, 2024 at 06:15:00PM +0900, Masami Hiramatsu wrote:
> On Sat, 20 Apr 2024 10:33:38 +0300
> Mike Rapoport wrote:
>
> > On Fri, Apr 19, 2024 at 03:59:40PM +, Christophe Leroy wrote:
> > >
> > >
> > > Le 19/04/2024 à 17:49,
On Fri, Apr 19, 2024 at 03:59:40PM +, Christophe Leroy wrote:
>
>
> Le 19/04/2024 à 17:49, Mike Rapoport a écrit :
> > Hi Masami,
> >
> > On Thu, Apr 18, 2024 at 06:16:15AM +0900, Masami Hiramatsu wrote:
> >> Hi Mike,
> >>
> >> On Thu
On Fri, Apr 19, 2024 at 02:42:16PM -0700, Song Liu wrote:
> On Fri, Apr 19, 2024 at 1:00 PM Mike Rapoport wrote:
> >
> > On Fri, Apr 19, 2024 at 10:32:39AM -0700, Song Liu wrote:
> > > On Fri, Apr 19, 2024 at 10:03 AM Mike Rapoport wrote:
> > >
On Fri, Apr 19, 2024 at 10:32:39AM -0700, Song Liu wrote:
> On Fri, Apr 19, 2024 at 10:03 AM Mike Rapoport wrote:
> [...]
> > > >
> > > > [1] https://lore.kernel.org/all/20240411160526.2093408-1-r...@kernel.org
> > >
> > > For the ROX to work, w
On Fri, Apr 19, 2024 at 08:54:40AM -0700, Song Liu wrote:
> On Thu, Apr 18, 2024 at 11:56 PM Mike Rapoport wrote:
> >
> > On Thu, Apr 18, 2024 at 02:01:22PM -0700, Song Liu wrote:
> > > On Thu, Apr 18, 2024 at 10:54 AM Mike Rapoport wrote:
> > > >
> > &g
Hi Masami,
On Thu, Apr 18, 2024 at 06:16:15AM +0900, Masami Hiramatsu wrote:
> Hi Mike,
>
> On Thu, 11 Apr 2024 19:00:50 +0300
> Mike Rapoport wrote:
>
> > From: "Mike Rapoport (IBM)"
> >
> > kprobes depended on CONFIG_MODULES because it has to a
On Thu, Apr 18, 2024 at 02:01:22PM -0700, Song Liu wrote:
> On Thu, Apr 18, 2024 at 10:54 AM Mike Rapoport wrote:
> >
> > On Thu, Apr 18, 2024 at 09:13:27AM -0700, Song Liu wrote:
> > > On Thu, Apr 18, 2024 at 8:37 AM Mike Rapoport wrote:
> > > > > >
>
On Thu, Apr 18, 2024 at 10:31:16PM +0300, Nadav Amit wrote:
>
> > On 18 Apr 2024, at 13:20, Mike Rapoport wrote:
> >
> > On Tue, Apr 16, 2024 at 12:36:08PM +0300, Nadav Amit wrote:
> >>
> >>
> >>
> >> I might be missing something,
On Thu, Apr 18, 2024 at 09:13:27AM -0700, Song Liu wrote:
> On Thu, Apr 18, 2024 at 8:37 AM Mike Rapoport wrote:
> > > >
> > > > I'm looking at execmem_types more as definition of the consumers, maybe
> > > > I
> > > > should have named the enum
Hi Masami,
On Thu, Apr 18, 2024 at 06:16:15AM +0900, Masami Hiramatsu wrote:
> Hi Mike,
>
> On Thu, 11 Apr 2024 19:00:50 +0300
> Mike Rapoport wrote:
>
> > From: "Mike Rapoport (IBM)"
> >
> > kprobes depended on CONFIG_MODULES because it has to a
On Wed, Apr 17, 2024 at 04:32:49PM -0700, Song Liu wrote:
> On Tue, Apr 16, 2024 at 12:23 AM Mike Rapoport wrote:
> >
> > On Mon, Apr 15, 2024 at 06:36:39PM +0100, Mark Rutland wrote:
> > > On Mon, Apr 15, 2024 at 09:52:41AM +0200, Peter Zijlstra wrote:
> > > >
On Tue, Apr 16, 2024 at 09:52:34AM +0200, Peter Zijlstra wrote:
> On Mon, Apr 15, 2024 at 08:00:26PM +0300, Mike Rapoport wrote:
> > On Mon, Apr 15, 2024 at 12:47:50PM +0200, Peter Zijlstra wrote:
> > > On Thu, Apr 11, 2024 at 07:05:25PM +0300, Mike Rapoport wrote:
> >
On Tue, Apr 16, 2024 at 12:36:08PM +0300, Nadav Amit wrote:
>
>
> > On 11 Apr 2024, at 19:05, Mike Rapoport wrote:
> >
> > @@ -2440,7 +2479,24 @@ static int post_relocation(struct module *mod, const
> > struct load_info *info)
> > add_kallsyms(mod,
On Mon, Apr 15, 2024 at 06:36:39PM +0100, Mark Rutland wrote:
> On Mon, Apr 15, 2024 at 09:52:41AM +0200, Peter Zijlstra wrote:
> > On Thu, Apr 11, 2024 at 07:00:41PM +0300, Mike Rapoport wrote:
> > > +/**
> > > + * enum execmem_type - types
On Mon, Apr 15, 2024 at 12:43:16PM +0200, Peter Zijlstra wrote:
> On Thu, Apr 11, 2024 at 07:05:24PM +0300, Mike Rapoport wrote:
> > diff --git a/arch/x86/kernel/alternative.c b/arch/x86/kernel/alternative.c
> > index 45a280f2161c..b4d6868df573 100644
> > --- a/arch/x86
On Mon, Apr 15, 2024 at 12:47:50PM +0200, Peter Zijlstra wrote:
> On Thu, Apr 11, 2024 at 07:05:25PM +0300, Mike Rapoport wrote:
>
> > To populate the cache, a writable large page is allocated from vmalloc with
> > VM_ALLOW_HUGE_VMAP, filled with invalid instructions and then r
On Mon, Apr 15, 2024 at 09:52:41AM +0200, Peter Zijlstra wrote:
> On Thu, Apr 11, 2024 at 07:00:41PM +0300, Mike Rapoport wrote:
> > +/**
> > + * enum execmem_type - types of executable memory ranges
> > + *
> > + * There are several subsystems that
On Fri, Apr 12, 2024 at 11:08:00AM +0200, Ingo Molnar wrote:
>
> * Mike Rapoport wrote:
>
> > for (s = start; s < end; s++) {
> > void *addr = (void *)s + *s;
> > + void *wr_addr = addr + module_writable_offset(mod, addr);
>
>
On Fri, Apr 12, 2024 at 06:07:19AM +, Christophe Leroy wrote:
>
>
> Le 11/04/2024 à 18:05, Mike Rapoport a écrit :
> > From: "Mike Rapoport (IBM)"
> >
> > vmalloc allocations with VM_ALLOW_HUGE_VMAP that do not explictly
> > specify node I
On Thu, Apr 11, 2024 at 10:53:46PM +0200, Sam Ravnborg wrote:
> Hi Mike.
>
> On Thu, Apr 11, 2024 at 07:00:42PM +0300, Mike Rapoport wrote:
> > From: "Mike Rapoport (IBM)"
> >
> > Several architectures override module_alloc() only to define address
> >
On Fri, Apr 12, 2024 at 11:16:10AM +0200, Ingo Molnar wrote:
>
> * Mike Rapoport wrote:
>
> > +/**
> > + * enum execmem_type - types of executable memory ranges
> > + *
> > + * There are several subsystems that allocate executable memory.
> > + * Arch
On Thu, Apr 11, 2024 at 12:42:05PM -0700, Luis Chamberlain wrote:
> On Thu, Apr 11, 2024 at 07:00:41PM +0300, Mike Rapoport wrote:
> > From: "Mike Rapoport (IBM)"
> >
> > module_alloc() is used everywhere as a mean to allocate memory for code.
> >
From: "Mike Rapoport (IBM)"
Enable execmem's cache of PMD_SIZE'ed pages mapped as ROX for module
text allocations.
Signed-off-by: Mike Rapoport (IBM)
---
arch/x86/mm/init.c | 29 +
1 file changed, 25 insertions(+), 4 deletions(-)
diff --git a/arch/x86/m
From: "Mike Rapoport (IBM)"
Using large pages to map text areas reduces iTLB pressure and improves
performance.
Extend execmem_alloc() with an ability to use PMD_SIZE'ed pages with ROX
permissions as a cache for smaller allocations.
To populate the cache, a writable large page is
From: "Mike Rapoport (IBM)"
When module text memory will be allocated with ROX permissions, the
memory at the actual address where the module will live will contain
invalid instructions and there will be a writable copy that contains the
actual module code.
Update relocations and al
From: Song Liu
ftrace_process_locs sorts module mcount, which is inside RO memory. Add a
ftrace_swap_func so that archs can use RO-memory-poke function to do the
sorting.
Signed-off-by: Song Liu
Signed-off-by: Mike Rapoport (IBM)
---
include/linux/ftrace.h | 2 ++
kernel/trace/ftrace.c
From: "Mike Rapoport (IBM)"
In order to support ROX allocations for module text, it is necessary to
handle modifications to the code, such as relocations and alternatives
patching, without write access to that memory.
One option is to use text patching, but this would make modu
From: "Mike Rapoport (IBM)"
vmalloc allocations with VM_ALLOW_HUGE_VMAP that do not explictly
specify node ID will use huge pages only if size_per_node is larger than
PMD_SIZE.
Still the actual allocated memory is not distributed between nodes and
there is no advantage in suc
From: "Mike Rapoport (IBM)"
Several architectures support text patching, but they name the header
files that declare patching functions differently.
Make all such headers consistently named text-patching.h and add an empty
header in asm-generic for architectures that do not su
From: "Mike Rapoport (IBM)"
Hi,
These patches add support for using large ROX pages for allocations of
executable memory on x86.
They address Andy's comments [1] about having executable mappings for code
that was not completely formed.
The approach taken is to allocate ROX me
From: "Mike Rapoport (IBM)"
BPF just-in-time compiler depended on CONFIG_MODULES because it used
module_alloc() to allocate memory for the generated code.
Since code allocations are now implemented with execmem, drop dependency of
CONFIG_BPF_JIT on CONFIG_MODULES and make
From: "Mike Rapoport (IBM)"
kprobes depended on CONFIG_MODULES because it has to allocate memory for
code.
Since code allocations are now implemented with execmem, kprobes can be
enabled in non-modular kernels.
Add #ifdef CONFIG_MODULE guards for the code dealing with kprobes insi
From: "Mike Rapoport (IBM)"
There are places where CONFIG_MODULES guards the code that depends on
memory allocation being done with module_alloc().
Replace CONFIG_MODULES with CONFIG_EXECMEM in such places.
Signed-off-by: Mike Rapoport (IBM)
---
arch/powerpc/Kconfig
From: "Mike Rapoport (IBM)"
Dynamic ftrace must allocate memory for code and this was impossible
without CONFIG_MODULES.
With execmem separated from the modules code, execmem_text_alloc() is
available regardless of CONFIG_MODULES.
Remove dependency of dynamic ftrace on CONFIG_MODULE
From: "Mike Rapoport (IBM)"
execmem does not depend on modules, on the contrary modules use
execmem.
To make execmem available when CONFIG_MODULES=n, for instance for
kprobes, split execmem_params initialization out from
arch/*/kernel/module.c and compile it when CONFIG_EXECMEM=y
From: "Mike Rapoport (IBM)"
powerpc overrides kprobes::alloc_insn_page() to remove writable
permissions when STRICT_MODULE_RWX is on.
Add definition of EXECMEM_KRPOBES to execmem_params to allow using the
generic kprobes::alloc_insn_page() with the desired permissions.
As po
From: "Mike Rapoport (IBM)"
The memory allocations for kprobes and BPF on RISC-V are not placed in
the modules area and these custom allocations are implemented with
overrides of alloc_insn_page() and bpf_jit_alloc_exec().
Slightly reorder execmem_params initialization to suppo
From: "Mike Rapoport (IBM)"
The memory allocations for kprobes and BPF on arm64 can be placed
anywhere in vmalloc address space and currently this is implemented with
overrides of alloc_insn_page() and bpf_jit_alloc_exec() in arm64.
Define EXECMEM_KPROBES and EXECMEM_BPF range
From: "Mike Rapoport (IBM)"
Extend execmem parameters to accommodate more complex overrides of
module_alloc() by architectures.
This includes specification of a fallback range required by arm, arm64
and powerpc, EXECMEM_MODULE_DATA type required by powerpc, support for
allocatio
From: "Mike Rapoport (IBM)"
Several architectures override module_alloc() only to define address
range for code allocations different than VMALLOC address space.
Provide a generic implementation in execmem that uses the parameters for
address space ranges, required alignmen
From: "Mike Rapoport (IBM)"
module_alloc() is used everywhere as a mean to allocate memory for code.
Beside being semantically wrong, this unnecessarily ties all subsystems
that need to allocate code, such as ftrace, kprobes and BPF to modules and
puts the burden of code
From: "Mike Rapoport (IBM)"
Move the logic related to the memory allocation and freeing into
module_memory_alloc() and module_memory_free().
Signed-off-by: Mike Rapoport (IBM)
---
kernel/module/main.c | 64 +++-
1 file changed, 39 inserti
From: "Mike Rapoport (IBM)"
nios2 uses kmalloc() to implement module_alloc() because CALL26/PCREL26
cannot reach all of vmalloc address space.
Define module space as 32MiB below the kernel base and switch nios2 to
use vmalloc for module allocations.
Suggested-by: Thomas Gleix
From: "Mike Rapoport (IBM)"
and MODULE_END to MODULES_END to match other architectures that define
custom address space for modules.
Signed-off-by: Mike Rapoport (IBM)
---
arch/mips/include/asm/pgtable-64.h | 4 ++--
arch/mips/kernel/module.c | 4 ++--
arch/mips/
From: "Mike Rapoport (IBM)"
Since commit f6f37d9320a1 ("arm64: select KASAN_VMALLOC for SW/HW_TAGS
modes") KASAN_VMALLOC is always enabled when KASAN is on. This means
that allocations in module_alloc() will be tracked by KASAN protection
for vmalloc() and that kasan
From: "Mike Rapoport (IBM)"
Hi,
Since v3 I looked into making execmem more of an utility toolbox, as we
discussed at LPC with Mark Rutland, but it was getting more hairier than
having a struct describing architecture constraints and a type identifying
the consumer of execmem.
And
> if (!size)
> continue;
> --
> 2.41.0
>
>
> >
> > if (!size)
> > continue;
> > @@ -1915,6 +1878,7 @@ void __init free_area_init(unsigned long
> > *max_zone_pfn)
> > check_for_memory(pgdat);
> > }
> >
> > + calc_nr_kernel_pages();
> > memmap_init();
> >
> > /* disable hash distribution for systems with a single node */
> > --
> > 2.41.0
> >
>
--
Sincerely yours,
Mike.
fs/nfs.ko] undefined!
> >>> ERROR: modpost: "memcpy" [fs/nfs/nfsv3.ko] undefined!
> >>> ERROR: modpost: "memcpy" [fs/nfsd/nfsd.ko] undefined!
> >>> ERROR: modpost: "memcpy" [fs/lockd/lockd.ko] undefined!
> >>> ERROR: modpost: "memcpy" [crypto/crypto.ko] undefined!
> >>> ERROR: modpost: "memcpy" [crypto/crypto_algapi.ko] undefined!
> >>> ERROR: modpost: "memcpy" [crypto/aead.ko] undefined!
> >>> ERROR: modpost: "memcpy" [crypto/crypto_skcipher.ko] undefined!
> >>> ERROR: modpost: "memcpy" [crypto/seqiv.ko] undefined!
> >
> > Are these from ARC build or otherwise ?
>
> This was arch/alpha.
>
> Arnd
--
Sincerely yours,
Mike.
On Mon, Mar 25, 2024 at 10:56:45PM +0800, Baoquan He wrote:
> Nobody calls calc_memmap_size() now.
>
> Signed-off-by: Baoquan He
Reviewed-by: Mike Rapoport (IBM)
Looks like I replied to patch 6/6 twice by mistake and missed this one.
> ---
> mm/mm_init.c | 20 ---
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