linux-kernel - Re: APIC: enable workaround on AMD Fam10h CPUs

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite for Android: free password hash cracker in your pocket

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:	Wed, 04 Feb 2009 07:41:12 -0500
From:	Mark Hounschell <markh@...pro.net>
To:	Borislav Petkov <borislav.petkov@....com>
CC:	Ingo Molnar <mingo@...e.hu>, Thomas Gleixner <tglx@...utronix.de>,
	Andreas Herrmann <andreas.herrmann3@....com>,
	linux-kernel@...r.kernel.org
Subject: Re: APIC: enable workaround on AMD Fam10h CPUs

Borislav Petkov wrote:
> From: Borislav Petkov <borislav.petkov@....com>
> Date: Tue, 3 Feb 2009 16:24:22 +0100
> Subject: [PATCH] APIC: enable workaround on AMD Fam10h CPUs
> 
> Impact: fix to enable APIC for AMD Fam10h on chipsets with a missing/b0rked
> 	ACPI MP table (MADT)
> 
> Booting a 32bit kernel on an AMD Fam10h CPU running on chipsets with
> missing/b0rked MP table leads to a hang pretty early in the boot process
> due to the APIC not being initialized. Fix that by falling back to the
> default APIC base address in 32bit code, as it is done in the 64bit
> codepath.
> 
> Signed-off-by: Borislav Petkov <borislav.petkov@....com>
> ---
>  arch/x86/kernel/apic.c |    2 +-
>  1 files changed, 1 insertions(+), 1 deletions(-)
> 
> diff --git a/arch/x86/kernel/apic.c b/arch/x86/kernel/apic.c
> index 4b6df24..115449f 100644
> --- a/arch/x86/kernel/apic.c
> +++ b/arch/x86/kernel/apic.c
> @@ -1436,7 +1436,7 @@ static int __init detect_init_APIC(void)
>  	switch (boot_cpu_data.x86_vendor) {
>  	case X86_VENDOR_AMD:
>  		if ((boot_cpu_data.x86 == 6 && boot_cpu_data.x86_model > 1) ||
> -		    (boot_cpu_data.x86 == 15))
> +		    (boot_cpu_data.x86 >= 15))
>  			break;
>  		goto no_apic;
>  	case X86_VENDOR_INTEL:

Hi Borislav,

Could this have anything to do with my Phenom-II problem that you've been so kind
to help me with?

Thanks
Mark
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/