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x86/CPU: Add a microcode loader callback

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Add a callback function which the microcode loader calls when microcode
has been updated to a newer revision. Do the callback only when no error
was encountered during loading.

Tested-by: Ashok Raj <ashok.raj@intel.com>
Signed-off-by: Borislav Petkov <bp@suse.de>
Reviewed-by: Ashok Raj <ashok.raj@intel.com>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Arjan van de Ven <arjan@linux.intel.com>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Dan Williams <dan.j.williams@intel.com>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: David Woodhouse <dwmw2@infradead.org>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Josh Poimboeuf <jpoimboe@redhat.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Link: http://lkml.kernel.org/r/20180216112640.11554-3-bp@alien8.de
Signed-off-by: Ingo Molnar <mingo@kernel.org>
This commit is contained in:
Borislav Petkov 2018-02-16 12:26:39 +01:00 committed by Ingo Molnar
parent 3f1f576a19
commit 1008c52c09
3 changed files with 17 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
arch/x86/include/asm/processor.h
View File

@ -977,4 +977,5 @@ bool xen_set_default_idle(void);
void stop_this_cpu(void *dummy);
void df_debug(struct pt_regs *regs, long error_code);
void microcode_check(void);
#endif /* _ASM_X86_PROCESSOR_H */

10
arch/x86/kernel/cpu/common.c
View File

@ -1749,3 +1749,13 @@ static int __init init_cpu_syscore(void)
return 0;
}
core_initcall(init_cpu_syscore);
/*
* The microcode loader calls this upon late microcode load to recheck features,
* only when microcode has been updated. Caller holds microcode_mutex and CPU
* hotplug lock.
*/
void microcode_check(void)
{
perf_check_microcode();
}

8
arch/x86/kernel/cpu/microcode/core.c
View File

@ -509,6 +509,7 @@ static ssize_t reload_store(struct device *dev,
const char *buf, size_t size)
{
enum ucode_state tmp_ret = UCODE_OK;
bool do_callback = false;
unsigned long val;
ssize_t ret = 0;
int cpu;
@ -531,10 +532,13 @@ static ssize_t reload_store(struct device *dev,
if (!ret)
ret = -EINVAL;
}
if (tmp_ret == UCODE_UPDATED)
do_callback = true;
}
if (!ret && tmp_ret == UCODE_UPDATED)
perf_check_microcode();
if (!ret && do_callback)
microcode_check();
mutex_unlock(&microcode_mutex);
put_online_cpus();