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x86/cpu: Get rid of the show_msr= boot option 

It is useless as it dumps the MSRs too early BUT(!) we do set MSRs later too.
Also, it dumps only BSP MSRs as it gets called only for CPU 0.

And the MSR range array would need constant updating anyway, and so on
and so on...

Oh, and we have msr.ko and msr-tools which are the much better solution
anyway. So off it goes...

Signed-off-by: Borislav Petkov <bp@suse.de>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Brian Gerst <brgerst@gmail.com>
Cc: Denys Vlasenko <dvlasenk@redhat.com>
Cc: H. Peter Anvin <hpa@zytor.com>
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/20161024173844.23038-4-bp@alien8.de
Signed-off-by: Ingo Molnar <mingo@kernel.org>
This commit is contained in:
Borislav Petkov 2016-10-24 19:38:44 +02:00 committed by Ingo Molnar
parent 62a67e123e
commit 59c6f278bd
2 changed files with 0 additions and 59 deletions
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6
Documentation/kernel-parameters.txt
View File

@ -3824,12 +3824,6 @@ bytes respectively. Such letter suffixes can also be entirely omitted.
shapers= [NET]
Maximal number of shapers.
show_msr= [x86] show boot-time MSR settings
Format: { <integer> }
Show boot-time (BIOS-initialized) MSR settings.
The parameter means the number of CPUs to show,
for example 1 means boot CPU only.
simeth= [IA-64]
simscsi=

53
arch/x86/kernel/cpu/common.c
View File

@ -1162,51 +1162,6 @@ void identify_secondary_cpu(struct cpuinfo_x86 *c)
mtrr_ap_init();
}
struct msr_range {
unsigned min;
unsigned max;
};
static const struct msr_range msr_range_array[] = {
{ 0x00000000, 0x00000418},
{ 0xc0000000, 0xc000040b},
{ 0xc0010000, 0xc0010142},
{ 0xc0011000, 0xc001103b},
};
static void __print_cpu_msr(void)
{
unsigned index_min, index_max;
unsigned index;
u64 val;
int i;
for (i = 0; i < ARRAY_SIZE(msr_range_array); i++) {
index_min = msr_range_array[i].min;
index_max = msr_range_array[i].max;
for (index = index_min; index < index_max; index++) {
if (rdmsrl_safe(index, &val))
continue;
pr_info(" MSR%08x: %016llx\n", index, val);
}
}
}
static int show_msr;
static __init int setup_show_msr(char *arg)
{
int num;
get_option(&arg, &num);
if (num > 0)
show_msr = num;
return 1;
}
__setup("show_msr=", setup_show_msr);
static __init int setup_noclflush(char *arg)
{
setup_clear_cpu_cap(X86_FEATURE_CLFLUSH);
@ -1240,14 +1195,6 @@ void print_cpu_info(struct cpuinfo_x86 *c)
pr_cont(", stepping: 0x%x)\n", c->x86_mask);
else
pr_cont(")\n");
print_cpu_msr(c);
}
void print_cpu_msr(struct cpuinfo_x86 *c)
{
if (c->cpu_index < show_msr)
__print_cpu_msr();
}
static __init int setup_disablecpuid(char *arg)