diff mbox series

[v5,bpf-next,7/9] module, bpf: store BTF base pointer in struct module

Message ID 20240528122408.3154936-8-alan.maguire@oracle.com (mailing list archive)
State Changes Requested
Delegated to: BPF
Headers show
Series bpf: support resilient split BTF | expand

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Commit Message

Alan Maguire May 28, 2024, 12:24 p.m. UTC 
...as this will allow split BTF modules with a base BTF
representation (rather than the full vmlinux BTF at time of
BTF encoding) to resolve their references to kernel types in a
way that is more resilient to small changes in kernel types.

This will allow modules that are not built every time the kernel
is to provide more resilient BTF, rather than have it invalidated
every time BTF ids for core kernel types change.

Signed-off-by: Alan Maguire <alan.maguire@oracle.com>
---
 include/linux/module.h | 2 ++
 kernel/module/main.c   | 5 ++++-
 2 files changed, 6 insertions(+), 1 deletion(-)

Comments

Luis Chamberlain May 28, 2024, 6:27 p.m. UTC | #1 
On Tue, May 28, 2024 at 01:24:06PM +0100, Alan Maguire wrote:
> ...as this will allow split BTF modules with a base BTF
> representation (rather than the full vmlinux BTF at time of
> BTF encoding) to resolve their references to kernel types in a
> way that is more resilient to small changes in kernel types.
> 
> This will allow modules that are not built every time the kernel
> is to provide more resilient BTF, rather than have it invalidated
> every time BTF ids for core kernel types change.
> 
> Signed-off-by: Alan Maguire <alan.maguire@oracle.com>

Reviewed-by: Luis Chamberlain <mcgrof@kernel.org>

  Luis
diff mbox series

Patch

diff --git a/include/linux/module.h b/include/linux/module.h
index ffa1c603163c..ccc5cc5e0850 100644
--- a/include/linux/module.h
+++ b/include/linux/module.h
@@ -510,6 +510,8 @@  struct module {
 #ifdef CONFIG_DEBUG_INFO_BTF_MODULES
 	unsigned int btf_data_size;
 	void *btf_data;
+	unsigned int btf_base_data_size;
+	void *btf_base_data;
 #endif
 #ifdef CONFIG_JUMP_LABEL
 	struct jump_entry *jump_entries;
diff --git a/kernel/module/main.c b/kernel/module/main.c
index 91e185607d4b..bd2870d9b175 100644
--- a/kernel/module/main.c
+++ b/kernel/module/main.c
@@ -2154,6 +2154,8 @@  static int find_module_sections(struct module *mod, struct load_info *info)
 #endif
 #ifdef CONFIG_DEBUG_INFO_BTF_MODULES
 	mod->btf_data = any_section_objs(info, ".BTF", 1, &mod->btf_data_size);
+	mod->btf_base_data = any_section_objs(info, ".BTF.base", 1,
+					      &mod->btf_base_data_size);
 #endif
 #ifdef CONFIG_JUMP_LABEL
 	mod->jump_entries = section_objs(info, "__jump_table",
@@ -2578,8 +2580,9 @@  static noinline int do_init_module(struct module *mod)
 	}
 
 #ifdef CONFIG_DEBUG_INFO_BTF_MODULES
-	/* .BTF is not SHF_ALLOC and will get removed, so sanitize pointer */
+	/* .BTF is not SHF_ALLOC and will get removed, so sanitize pointers */
 	mod->btf_data = NULL;
+	mod->btf_base_data = NULL;
 #endif
 	/*
 	 * We want to free module_init, but be aware that kallsyms may be