linux-kernel - [Patch v5 3/5] x86/microcode: Display revisions only when update is successful

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Date:   Fri, 20 Jan 2023 08:19:21 -0800
From:   Ashok Raj <ashok.raj@...el.com>
To:     Boris Petkov <bp@...en8.de>, Thomas Gleixner <tglx@...utronix.de>
Cc:     Ashok Raj <ashok.raj@...el.com>, Tony Luck <tony.luck@...el.com>,
        LKML <linux-kernel@...r.kernel.org>, x86 <x86@...nel.org>,
        Ingo Molnar <mingo@...nel.org>,
        Dave Hansen <dave.hansen@...el.com>,
        Alison Schofield <alison.schofield@...el.com>,
        Reinette Chatre <reinette.chatre@...el.com>,
        Tom Lendacky <thomas.lendacky@....com>,
        Stefan Talpalaru <stefantalpalaru@...oo.com>,
        David Woodhouse <dwmw2@...radead.org>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Jonathan Corbet <corbet@....net>,
        "Rafael J . Wysocki" <rafael@...nel.org>,
        Peter Zilstra <peterz@...radead.org>,
        Andy Lutomirski <luto@...nel.org>,
        Andrew Cooper <Andrew.Cooper3@...rix.com>,
        Boris Ostrovsky <boris.ostrovsky@...cle.com>
Subject: [Patch v5 3/5] x86/microcode: Display revisions only when update is successful

Right now, microcode loading failures and successes print the same
message "Reloading completed". This is misleading to users.

Display the updated revision number only if an update was successful.
Display "Reload completed" only if the update was successful, otherwise
report the update failed.

Signed-off-by: Ashok Raj <ashok.raj@...el.com>
Fixes: 9bd681251b7c ("x86/microcode: Announce reload operation's completion")
Suggested-by: Thomas Gleixner <tglx@...utronix.de>
Reviewed-by: Tony Luck <tony.luck@...el.com>
Link: https://lore.kernel.org/lkml/874judpqqd.ffs@tglx/
Cc: LKML <linux-kernel@...r.kernel.org>
Cc: x86 <x86@...nel.org>
Cc: Ingo Molnar <mingo@...nel.org>
Cc: Tony Luck <tony.luck@...el.com>
Cc: Dave Hansen <dave.hansen@...el.com>
Cc: Alison Schofield <alison.schofield@...el.com>
Cc: Reinette Chatre <reinette.chatre@...el.com>
Cc: Thomas Gleixner (Intel) <tglx@...utronix.de>
Cc: Tom Lendacky <thomas.lendacky@....com>
Cc: Stefan Talpalaru <stefantalpalaru@...oo.com>
Cc: David Woodhouse <dwmw2@...radead.org>
Cc: Benjamin Herrenschmidt <benh@...nel.crashing.org>
Cc: Jonathan Corbet <corbet@....net>
Cc: Rafael J. Wysocki <rafael@...nel.org>
Cc: Peter Zilstra (Intel) <peterz@...radead.org>
Cc: Andy Lutomirski <luto@...nel.org>
Cc: Andrew Cooper <Andrew.Cooper3@...rix.com>
Cc: Boris Ostrovsky <boris.ostrovsky@...cle.com>
---
Changes since V3:

Tony, Ingo
	- Print clear message if the update was successful or not.
---
 arch/x86/kernel/cpu/microcode/core.c | 12 ++++++++----
 1 file changed, 8 insertions(+), 4 deletions(-)

diff --git a/arch/x86/kernel/cpu/microcode/core.c b/arch/x86/kernel/cpu/microcode/core.c
index bb943a91a364..d7cbc83df9b6 100644
--- a/arch/x86/kernel/cpu/microcode/core.c
+++ b/arch/x86/kernel/cpu/microcode/core.c
@@ -455,11 +455,15 @@ static int microcode_reload_late(void)
 	store_cpu_caps(&prev_info);
 
 	ret = stop_machine_cpuslocked(__reload_late, NULL, cpu_online_mask);
-	if (ret == 0)
-		microcode_check(&prev_info);
 
-	pr_info("Reload completed, microcode revision: 0x%x -> 0x%x\n",
-		old, boot_cpu_data.microcode);
+	if (ret == 0) {
+		pr_info("Reload completed, microcode revision: 0x%x -> 0x%x\n",
+			old, boot_cpu_data.microcode);
+		microcode_check(&prev_info);
+	} else {
+		pr_info("Reload failed, current microcode revision: 0x%x\n",
+			boot_cpu_data.microcode);
+	}
 
 	return ret;
 }
-- 
2.34.1