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From: Khalid Aziz <khalid.aziz@hp.com>
To: Dave Young <dyoung@redhat.com>
Cc: horms@verge.net.au, kexec@lists.infradead.org, vgoyal@redhat.com
Subject: Re: [PATCH]kdump: pass noefi and acpi_rsdp= to 2nd kernel
Date: Fri, 07 Sep 2012 08:37:14 -0600	[thread overview]
Message-ID: <1347028634.20255.79.camel@lyra> (raw)
In-Reply-To: <5049B6AD.9000304@redhat.com>

On Fri, 2012-09-07 at 16:56 +0800, Dave Young wrote:
> Actually in x86 setup code if bootloader do not pass correct efi_info in
> boot_params efi_enabled will be set to 0 automaticlly.
> 

When we kexec a kernel, the EFI signature is missing in the bootloader
signature in boot_params, so kexec'd kernels currently disable EFI
automatically even without noefi in this code:

arch/x86/kernel/setup.c:

733         if (!strncmp((char *)&boot_params.efi_info.efi_loader_signature,
734                      "EL32", 4)) {
735                 efi_enabled = 1;
736                 efi_64bit = false;
737         } else if (!strncmp((char *)&boot_params.efi_info.efi_loader_signatu     re,             
738                      "EL64", 4)) {
739                 efi_enabled = 1;
740                 efi_64bit = true;
741         }

efi_enabled is initialized to 0.

-- 
Khalid Aziz <khalid.aziz@hp.com>


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  reply	other threads:[~2012-09-07 14:37 UTC|newest]

Thread overview: 21+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2012-09-05  5:44 [PATCH]kdump: pass noefi and acpi_rsdp= to 2nd kernel Dave Young
2012-09-05  7:45 ` Simon Horman
2012-09-06  2:48   ` Dave Young
2012-09-05 13:18 ` Vivek Goyal
2012-09-06  2:58   ` Dave Young
2012-09-06 20:46     ` Vivek Goyal
2012-09-05 23:09 ` Khalid Aziz
2012-09-06  3:18   ` Dave Young
2012-09-06 17:57     ` Khalid Aziz
2012-09-07  8:56       ` Dave Young
2012-09-07 14:37         ` Khalid Aziz [this message]
2012-09-13 13:38           ` Vivek Goyal
2012-09-14 20:32             ` Khalid Aziz
2012-09-20  7:49               ` Eric W. Biederman
2012-09-21 22:50                 ` Khalid Aziz
2012-09-12  2:35         ` Dave Young
2012-10-18  3:12           ` Dave Young
2012-10-18 14:59             ` Khalid Aziz
2012-10-22  2:05               ` Dave Young
2012-09-06 20:24   ` Vivek Goyal
2012-09-07 14:32     ` Khalid Aziz

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