diff options
| author | Zishun Yi <zis@FreeBSD.org> | 2026-05-20 14:34:08 +0000 |
|---|---|---|
| committer | Mark Johnston <markj@FreeBSD.org> | 2026-05-20 14:35:15 +0000 |
| commit | b36fd09a834be586fbc1630294e17554e1f76175 (patch) | |
| tree | 53cb3bf1f7ffa7d7dc2d1204fc0e2eb03a1a995e | |
| parent | e924a2c80b9e1ace68d8ca0ffdacec65feec90a3 (diff) | |
amd64/vmparam: Fix KASAN shadow map size in comment
The address range 0xfffff78000000000 - 0xfffff7bfffffffff spans exactly 256GB
(0x4000000000 bytes), not 512GB.
For a 2TB kernel map, based on the KASAN 1:8 shadow map ratio, the required
shadow map size is indeed 256GB. The current comment incorrectly states 512GB,
which can be misleading and cause confusion.
Reviewed by: markj
MFC after: 1 week
Differential Revision: https://reviews.freebsd.org/D57129
| -rw-r--r-- | sys/amd64/include/vmparam.h | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/sys/amd64/include/vmparam.h b/sys/amd64/include/vmparam.h index 2914a204b2ef..1825c431f9f7 100644 --- a/sys/amd64/include/vmparam.h +++ b/sys/amd64/include/vmparam.h @@ -171,7 +171,7 @@ * 0xffff808000000000 - 0xffff847fffffffff large map (can be tuned up) * 0xffff848000000000 - 0xfffff77fffffffff unused (large map extends there) * 0xfffff60000000000 - 0xfffff7ffffffffff 2TB KMSAN origin map, optional - * 0xfffff78000000000 - 0xfffff7bfffffffff 512GB KASAN shadow map, optional + * 0xfffff78000000000 - 0xfffff7bfffffffff 256GB KASAN shadow map, optional * 0xfffff80000000000 - 0xfffffbffffffffff 4TB direct map * 0xfffffc0000000000 - 0xfffffdffffffffff 2TB KMSAN shadow map, optional * 0xfffffe0000000000 - 0xffffffffffffffff 2TB kernel map @@ -185,7 +185,7 @@ * 0xff41000000000000 - 0xffff7fffffffffff unused * 0xffff800000000000 - 0xfffff5ffffffffff unused (start of kernel pml4 entry) * 0xfffff60000000000 - 0xfffff7ffffffffff 2TB KMSAN origin map, optional - * 0xfffff78000000000 - 0xfffff7bfffffffff 512GB KASAN shadow map, optional + * 0xfffff78000000000 - 0xfffff7bfffffffff 256GB KASAN shadow map, optional * 0xfffff80000000000 - 0xfffffbffffffffff 4TB unused * 0xfffffc0000000000 - 0xfffffdffffffffff 2TB KMSAN shadow map, optional * 0xfffffe0000000000 - 0xffffffffffffffff 2TB kernel map |