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| author | Linus Torvalds <torvalds@linux-foundation.org> | 2024-12-01 21:35:37 +0100 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2024-12-01 21:35:37 +0100 |
| commit | 58ac609b99db0b03f3b09299c8fa3a76face3370 (patch) | |
| tree | 5822157ef9d3c6ffc90b5eff2b1492dd3b615777 /Documentation/arch | |
| parent | strscpy: write destination buffer only once (diff) | |
| parent | x86/CPU/AMD: Terminate the erratum_1386_microcode array (diff) | |
| download | linux-58ac609b99db0b03f3b09299c8fa3a76face3370.tar.xz linux-58ac609b99db0b03f3b09299c8fa3a76face3370.zip | |
Merge tag 'x86_urgent_for_v6.13_rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
Pull x86 fixes from Borislav Petkov:
- Add a terminating zero end-element to the array describing AMD CPUs
affected by erratum 1386 so that the matching loop actually
terminates instead of going off into the weeds
- Update the boot protocol documentation to mention the fact that the
preferred address to load the kernel to is considered in the
relocatable kernel case too
- Flush the memory buffer containing the microcode patch after applying
microcode on AMD Zen1 and Zen2, to avoid unnecessary slowdowns
- Make sure the PPIN CPU feature flag is cleared on all CPUs if PPIN
has been disabled
* tag 'x86_urgent_for_v6.13_rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
x86/CPU/AMD: Terminate the erratum_1386_microcode array
x86/Documentation: Update algo in init_size description of boot protocol
x86/microcode/AMD: Flush patch buffer mapping after application
x86/mm: Carve out INVLPG inline asm for use by others
x86/cpu: Fix PPIN initialization
Diffstat (limited to 'Documentation/arch')
| -rw-r--r-- | Documentation/arch/x86/boot.rst | 17 |
1 files changed, 13 insertions, 4 deletions
diff --git a/Documentation/arch/x86/boot.rst b/Documentation/arch/x86/boot.rst index 4fd492cb4970..ad2d8ddad27f 100644 --- a/Documentation/arch/x86/boot.rst +++ b/Documentation/arch/x86/boot.rst @@ -896,10 +896,19 @@ Offset/size: 0x260/4 The kernel runtime start address is determined by the following algorithm:: - if (relocatable_kernel) - runtime_start = align_up(load_address, kernel_alignment) - else - runtime_start = pref_address + if (relocatable_kernel) { + if (load_address < pref_address) + load_address = pref_address; + runtime_start = align_up(load_address, kernel_alignment); + } else { + runtime_start = pref_address; + } + +Hence the necessary memory window location and size can be estimated by +a boot loader as:: + + memory_window_start = runtime_start; + memory_window_size = init_size; ============ =============== Field name: handover_offset |