6.6-stable review patch. If anyone has any objections, please let me know.
------------------
From: "Borislav Petkov (AMD)" bp@alien8.de
commit dc15675074dcfd79a2f10a6e39f96b0244961a01 upstream
No functional changes.
Signed-off-by: Borislav Petkov (AMD) bp@alien8.de Reviewed-by: Thomas Gleixner tglx@linutronix.de Link: https://lore.kernel.org/r/20250211163648.30531-4-bp@kernel.org Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- arch/x86/kernel/cpu/microcode/amd.c | 60 +++++++++++++++--------------------- 1 file changed, 26 insertions(+), 34 deletions(-)
--- a/arch/x86/kernel/cpu/microcode/amd.c +++ b/arch/x86/kernel/cpu/microcode/amd.c @@ -515,39 +515,6 @@ static bool __apply_microcode_amd(struct return true; }
-/* - * Early load occurs before we can vmalloc(). So we look for the microcode - * patch container file in initrd, traverse equivalent cpu table, look for a - * matching microcode patch, and update, all in initrd memory in place. - * When vmalloc() is available for use later -- on 64-bit during first AP load, - * and on 32-bit during save_microcode_in_initrd_amd() -- we can call - * load_microcode_amd() to save equivalent cpu table and microcode patches in - * kernel heap memory. - * - * Returns true if container found (sets @desc), false otherwise. - */ -static bool early_apply_microcode(u32 old_rev, void *ucode, size_t size) -{ - struct cont_desc desc = { 0 }; - struct microcode_amd *mc; - bool ret = false; - - scan_containers(ucode, size, &desc); - - mc = desc.mc; - if (!mc) - return ret; - - /* - * Allow application of the same revision to pick up SMT-specific - * changes even if the revision of the other SMT thread is already - * up-to-date. - */ - if (old_rev > mc->hdr.patch_id) - return ret; - - return __apply_microcode_amd(mc, desc.psize); -}
static bool get_builtin_microcode(struct cpio_data *cp) { @@ -586,8 +553,19 @@ static bool __init find_blobs_in_contain return found; }
+/* + * Early load occurs before we can vmalloc(). So we look for the microcode + * patch container file in initrd, traverse equivalent cpu table, look for a + * matching microcode patch, and update, all in initrd memory in place. + * When vmalloc() is available for use later -- on 64-bit during first AP load, + * and on 32-bit during save_microcode_in_initrd() -- we can call + * load_microcode_amd() to save equivalent cpu table and microcode patches in + * kernel heap memory. + */ void __init load_ucode_amd_bsp(struct early_load_data *ed, unsigned int cpuid_1_eax) { + struct cont_desc desc = { }; + struct microcode_amd *mc; struct cpio_data cp = { }; u32 dummy;
@@ -601,7 +579,21 @@ void __init load_ucode_amd_bsp(struct ea if (!find_blobs_in_containers(&cp)) return;
- if (early_apply_microcode(ed->old_rev, cp.data, cp.size)) + scan_containers(cp.data, cp.size, &desc); + + mc = desc.mc; + if (!mc) + return; + + /* + * Allow application of the same revision to pick up SMT-specific + * changes even if the revision of the other SMT thread is already + * up-to-date. + */ + if (ed->old_rev > mc->hdr.patch_id) + return; + + if (__apply_microcode_amd(mc, desc.psize)) native_rdmsr(MSR_AMD64_PATCH_LEVEL, ed->new_rev, dummy); }