From: Greg KH <gregkh@linuxfoundation.org>
To: Evalds Iodzevics <evalds.iodzevics@gmail.com>
Cc: linux-kernel@vger.kernel.org, tglx@linutronix.de, ben@decadent.org.uk
Subject: Re: [PATCH v2] x86/microcode/intel: replace sync_core() with native_cpuid_reg(eax)
Date: Tue, 21 Apr 2020 07:59:55 +0200 [thread overview]
Message-ID: <20200421055955.GA343434@kroah.com> (raw)
In-Reply-To: <20200421085344.1804-1-evalds.iodzevics@gmail.com>
On Tue, Apr 21, 2020 at 11:53:44AM +0300, Evalds Iodzevics wrote:
> On Intel it is required to do CPUID(1) before reading the microcode
> revision MSR. Current code in 4.4 an 4.9 relies on sync_core() to call
> CPUID, unfortunately on 32 bit machines code inside sync_core() always
> jumps past CPUID instruction as it depends on data structure boot_cpu_data
> witch are not populated correctly so early in boot sequence.
>
> It depends on:
> commit 5dedade6dfa2 ("x86/CPU: Add native CPUID variants returning a single
> datum")
>
> This patch is for 4.4 but also should apply to 4.9
>
> Signed-off-by: Evalds Iodzevics <evalds.iodzevics@gmail.com>
> ---
> arch/x86/include/asm/microcode_intel.h | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
Why are you not sending this to the stable mailing list like I have
pointed out numerous times by sending you a link to _how_ to get a patch
into the stable kernel trees?
Again, here it is:
https://www.kernel.org/doc/html/latest/process/stable-kernel-rules.html
Please follow that so that we can do this correctly.
thanks,
greg k-h
next prev parent reply other threads:[~2020-04-21 6:00 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-04-20 12:00 [PATCH] x86/microcode/intel: replace sync_core() with native_cpuid_reg(eax) Evalds Iodzevics
2020-04-20 9:31 ` Borislav Petkov
2020-04-20 13:33 ` Ben Hutchings
2020-04-20 14:01 ` Evalds Iodzevics
2020-04-20 9:57 ` Greg KH
2020-04-21 8:53 ` [PATCH v2] " Evalds Iodzevics
2020-04-21 5:59 ` Greg KH [this message]
2020-04-21 6:41 ` Evalds Iodzevics
2020-04-21 7:19 ` Greg KH
2020-04-22 8:17 Evalds Iodzevics
2020-04-22 8:27 ` Greg KH
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