diff mbox series

[bpf-next,1/3] bpf: Use precise image size for struct_ops trampoline

Message ID 20240123103241.2282122-2-pulehui@huaweicloud.com (mailing list archive)
State Changes Requested
Delegated to: BPF
Headers show
Series Use bpf_prog_pack for RV64 bpf trampoline | expand

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Commit Message

Pu Lehui Jan. 23, 2024, 10:32 a.m. UTC 
From: Pu Lehui <pulehui@huawei.com>

For trampoline using bpf_prog_pack, we need to generate a rw_image
buffer with size of (image_end - image). For regular trampoline, we use
the precise image size generated by arch_bpf_trampoline_size to allocate
rw_image. But for struct_ops trampoline, we allocate rw_image directly
using close to PAGE_SIZE size. We do not need to allocate for that much,
as the patch size is usually much smaller than PAGE_SIZE. Let's use
precise image size for it too.

Signed-off-by: Pu Lehui <pulehui@huawei.com>
---
 kernel/bpf/bpf_struct_ops.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

Comments

Song Liu Jan. 29, 2024, 5:21 p.m. UTC | #1 
On Tue, Jan 23, 2024 at 2:32 AM Pu Lehui <pulehui@huaweicloud.com> wrote:
>
> From: Pu Lehui <pulehui@huawei.com>
>
> For trampoline using bpf_prog_pack, we need to generate a rw_image
> buffer with size of (image_end - image). For regular trampoline, we use
> the precise image size generated by arch_bpf_trampoline_size to allocate
> rw_image. But for struct_ops trampoline, we allocate rw_image directly
> using close to PAGE_SIZE size. We do not need to allocate for that much,
> as the patch size is usually much smaller than PAGE_SIZE. Let's use
> precise image size for it too.
>
> Signed-off-by: Pu Lehui <pulehui@huawei.com>

Acked-by: Song Liu <song@kernel.org>
diff mbox series

Patch

diff --git a/kernel/bpf/bpf_struct_ops.c b/kernel/bpf/bpf_struct_ops.c
index 02068bd0e4d9..e2e1bf3c69a3 100644
--- a/kernel/bpf/bpf_struct_ops.c
+++ b/kernel/bpf/bpf_struct_ops.c
@@ -368,7 +368,7 @@  int bpf_struct_ops_prepare_trampoline(struct bpf_tramp_links *tlinks,
 		return size;
 	if (size > (unsigned long)image_end - (unsigned long)image)
 		return -E2BIG;
-	return arch_prepare_bpf_trampoline(NULL, image, image_end,
+	return arch_prepare_bpf_trampoline(NULL, image, image + size,
 					   model, flags, tlinks, stub_func);
 }