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x86/microcode: Default-disable late loading

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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
This commit is contained in:
Borislav Petkov
2022-05-25 18:12:30 +02:00
committed by Thomas Gleixner
parent 181b6f40e9
commit a77a94f862
3 changed files with 19 additions and 1 deletions
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7
arch/x86/kernel/cpu/microcode/core.c
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@@ -376,6 +376,7 @@ static int apply_microcode_on_target(int cpu)
/* fake device for request_firmware */
static struct platform_device *microcode_pdev;
#ifdef CONFIG_MICROCODE_LATE_LOADING
/*
* Late loading dance. Why the heavy-handed stomp_machine effort?
*
@@ -543,6 +544,9 @@ put:
return ret;
}
static DEVICE_ATTR_WO(reload);
#endif
static ssize_t version_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
@@ -559,7 +563,6 @@ static ssize_t pf_show(struct device *dev,
return sprintf(buf, "0x%x\n", uci->cpu_sig.pf);
}
static DEVICE_ATTR_WO(reload);
static DEVICE_ATTR(version, 0444, version_show, NULL);
static DEVICE_ATTR(processor_flags, 0444, pf_show, NULL);
@@ -712,7 +715,9 @@ static int mc_cpu_down_prep(unsigned int cpu)
}
static struct attribute *cpu_root_microcode_attrs[] = {
#ifdef CONFIG_MICROCODE_LATE_LOADING
&dev_attr_reload.attr,
#endif
NULL
};