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From: Vitezslav Samel <vitezslav@samel.cz>
To: Borislav Petkov <bp@suse.de>
Cc: "Raj, Ashok" <ashok.raj@intel.com>,
	Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
	linux-kernel@vger.kernel.org, x86-ml <x86@kernel.org>
Subject: Re: [PATCH 1/2] x86/microcode/intel: Save microcode patch unconditionally
Date: Fri, 20 Apr 2018 12:54:08 +0200	[thread overview]
Message-ID: <20180420105408.GA2257@pc11.op.pod.cz> (raw)
In-Reply-To: <20180420103428.GD13977@pd.tnic>

On Fri, Apr 20, 2018 at 12:34:28PM +0200, Borislav Petkov wrote:
> save_mc_for_early() was a no-op on !CONFIG_HOTPLUG_CPU but the
> generic_load_microcode() path saves the microcode patches it has found
> into our cache of patches which is used for late loading too. Regardless
> of whether we do CPU hotplug or not.
> 
> So make the saving unconditional so that late loading can find the
> proper patch.
> 
> Reported-by: Vitezslav Samel <vitezslav@samel.cz>

  Tested-by: Vitezslav Samel <vitezslav@samel.cz>

> Signed-off-by: Borislav Petkov <bp@suse.de>
> Cc: Ashok Raj <ashok.raj@intel.com>
> Cc: <stable@vger.kernel.org> # if it has backported d8c3b52c00a05036e0a6b315b4b17921a7b67997
> Link: http://lkml.kernel.org/r/20180418081140.GA2439@pc11.op.pod.cz
> ---
>  arch/x86/kernel/cpu/microcode/intel.c | 2 --
>  1 file changed, 2 deletions(-)
> 
> diff --git a/arch/x86/kernel/cpu/microcode/intel.c b/arch/x86/kernel/cpu/microcode/intel.c
> index 32b8e5724f96..1c2cfa0644aa 100644
> --- a/arch/x86/kernel/cpu/microcode/intel.c
> +++ b/arch/x86/kernel/cpu/microcode/intel.c
> @@ -485,7 +485,6 @@ static void show_saved_mc(void)
>   */
>  static void save_mc_for_early(u8 *mc, unsigned int size)
>  {
> -#ifdef CONFIG_HOTPLUG_CPU
>  	/* Synchronization during CPU hotplug. */
>  	static DEFINE_MUTEX(x86_cpu_microcode_mutex);
>  
> @@ -495,7 +494,6 @@ static void save_mc_for_early(u8 *mc, unsigned int size)
>  	show_saved_mc();
>  
>  	mutex_unlock(&x86_cpu_microcode_mutex);
> -#endif
>  }
>  
>  static bool load_builtin_intel_microcode(struct cpio_data *cp)
> -- 
> 2.13.0
> 
> SUSE Linux GmbH, GF: Felix Imendörffer, Jane Smithard, Graham Norton, HRB 21284 (AG Nürnberg)
> -- 

  reply	other threads:[~2018-04-20 10:54 UTC|newest]

Thread overview: 29+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-04-18  8:11 4.15.17 regression: bisected: timeout during microcode update Vitezslav Samel
2018-04-18 10:07 ` Borislav Petkov
2018-04-18 12:08   ` Vitezslav Samel
2018-04-18 12:22     ` Borislav Petkov
2018-04-18 13:53       ` Raj, Ashok
2018-04-18 16:14         ` Borislav Petkov
2018-04-19  5:35         ` Vitezslav Samel
2018-04-19  7:22           ` Raj, Ashok
2018-04-19 10:48           ` Borislav Petkov
2018-04-19 12:02             ` Vitezslav Samel
2018-04-19 12:18               ` Borislav Petkov
2018-04-19 12:32                 ` Raj, Ashok
2018-04-19 13:48                   ` Vitezslav Samel
2018-04-19 13:46                 ` Vitezslav Samel
2018-04-19 16:37                   ` Borislav Petkov
2018-04-20  6:20                     ` Vitezslav Samel
2018-04-20  9:52                       ` Borislav Petkov
2018-04-20 10:01                         ` Vitezslav Samel
2018-04-20 10:32                           ` Borislav Petkov
2018-04-20 10:34                             ` [PATCH 1/2] x86/microcode/intel: Save microcode patch unconditionally Borislav Petkov
2018-04-20 10:54                               ` Vitezslav Samel [this message]
2018-04-20 15:59                               ` Raj, Ashok
2018-04-20 10:37                             ` [PATCH 2/2] x86/microcode: Do not exit early from __reload_late() Borislav Petkov
2018-04-20 10:54                               ` Vitezslav Samel
2018-04-20 16:00                               ` Raj, Ashok
2018-04-21  8:19 ` [PATCH 1/2] x86/microcode/intel: Save microcode patch unconditionally Borislav Petkov
2018-04-21  8:19   ` [PATCH 2/2] x86/microcode: Do not exit early from __reload_late() Borislav Petkov
2018-04-24  7:52     ` [tip:x86/urgent] " tip-bot for Borislav Petkov
2018-04-24  7:51   ` [tip:x86/urgent] x86/microcode/intel: Save microcode patch unconditionally tip-bot for Borislav Petkov

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