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x86/microcode: Default-disable late loading

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[ Upstream commit a77a94f86273ce42a39cb479217dd8d68acfe0ff ]

It is dangerous and it should not be used anyway - there's a nice early
loading already.

Requested-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Borislav Petkov <bp@suse.de>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Link: https://lore.kernel.org/r/20220525161232.14924-3-bp@alien8.de
Stable-dep-of: c0dd9245aa9e ("x86/microcode: Check CPU capabilities after late microcode update correctly")
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Borislav Petkov
2022-05-25 18:12:30 +02:00
committed by Greg Kroah-Hartman
parent 9e56938f20
commit e623080668
3 changed files with 19 additions and 1 deletions
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arch/x86/kernel/cpu/common.c
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@@ -2129,6 +2129,7 @@ void cpu_init_secondary(void)
}
#endif
#ifdef CONFIG_MICROCODE_LATE_LOADING
/*
* The microcode loader calls this upon late microcode load to recheck features,
* only when microcode has been updated. Caller holds microcode_mutex and CPU
@@ -2158,6 +2159,7 @@ void microcode_check(void)
pr_warn("x86/CPU: CPU features have changed after loading microcode, but might not take effect.\n");
pr_warn("x86/CPU: Please consider either early loading through initrd/built-in or a potential BIOS update.\n");
}
#endif
/*
* Invoked from core CPU hotplug code after hotplug operations