All of lore.kernel.org
 help / color / mirror / Atom feed
From: Borislav Petkov <bp@alien8.de>
To: X86 ML <x86@kernel.org>
Cc: LKML <linux-kernel@vger.kernel.org>
Subject: [PATCH 3/3] x86/CPU: Get rid of show_msr
Date: Mon, 24 Oct 2016 19:38:44 +0200	[thread overview]
Message-ID: <20161024173844.23038-4-bp@alien8.de> (raw)
In-Reply-To: <20161024173844.23038-1-bp@alien8.de>

From: Borislav Petkov <bp@suse.de>

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>
---
 Documentation/kernel-parameters.txt |  6 -----
 arch/x86/kernel/cpu/common.c        | 53 -------------------------------------
 2 files changed, 59 deletions(-)

diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt
index 459b301137c2..73de01eb92b6 100644
--- a/Documentation/kernel-parameters.txt
+++ b/Documentation/kernel-parameters.txt
@@ -3818,12 +3818,6 @@ 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=
 
diff --git a/arch/x86/kernel/cpu/common.c b/arch/x86/kernel/cpu/common.c
index 1a1d668263b9..f3e7ab29c162 100644
--- a/arch/x86/kernel/cpu/common.c
+++ b/arch/x86/kernel/cpu/common.c
@@ -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)
-- 
2.10.0

  parent reply	other threads:[~2016-10-24 17:39 UTC|newest]

Thread overview: 8+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2016-10-24 17:38 [PATCH 0/3] " Borislav Petkov
2016-10-24 17:38 ` [PATCH 1/3] x86/CPU: Remove the printk format specifier in "CPU0: " Borislav Petkov
2016-10-25 10:33   ` [tip:x86/cpu] x86/cpu: " tip-bot for Borislav Petkov
2016-10-24 17:38 ` [PATCH 2/3] x86/CPU: Merge bugs.c and bugs_64.c Borislav Petkov
2016-10-25 10:33   ` [tip:x86/cpu] x86/cpu: " tip-bot for Borislav Petkov
2016-10-24 17:38 ` Borislav Petkov [this message]
2016-10-25 10:34   ` [tip:x86/cpu] x86/cpu: Get rid of the show_msr= boot option tip-bot for Borislav Petkov
2016-10-26 22:25     ` Yinghai Lu

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=20161024173844.23038-4-bp@alien8.de \
    --to=bp@alien8.de \
    --cc=linux-kernel@vger.kernel.org \
    --cc=x86@kernel.org \
    --subject='Re: [PATCH 3/3] x86/CPU: Get rid of show_msr' \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link

This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.