linux-kernel - Re: [PATCH -v2] EFI: Runtime services virtual mapping

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Date:	Sun, 22 Sep 2013 15:37:22 +0200
From:	Borislav Petkov <bp@...en8.de>
To:	Dave Young <dyoung@...hat.com>
Cc:	X86 ML <x86@...nel.org>, LKML <linux-kernel@...r.kernel.org>,
	Borislav Petkov <bp@...e.de>,
	Matt Fleming <matt@...sole-pimps.org>,
	Matthew Garrett <mjg59@...f.ucam.org>,
	"H. Peter Anvin" <hpa@...or.com>,
	James Bottomley <James.Bottomley@...senPartnership.com>,
	Vivek Goyal <vgoyal@...hat.com>, linux-efi@...r.kernel.org
Subject: Re: [PATCH -v2] EFI: Runtime services virtual mapping

On Sun, Sep 22, 2013 at 08:35:15PM +0800, Dave Young wrote:
> I tested your new patch, it works both with efi stub and grub boot in
> 1st kernel.

Good, thanks!

> But it paniced in kexec boot with my kexec related patcheset, the patchset

That's the second kernel, right?

> contains 3 patch:
> 1. introduce cmdline kexecboot=<0|1|2>; 1 == kexec, 2 == kdump
> 2. export physical addr fw_vendor, runtime, tables to /sys/firmware/efi/systab
> 3. if kexecboot != 0, use fw_vendor, runtime, tables from bootparams; Also do not
>    call SetVirtualAddressMao in case kexecboot.
> 
> The panic happens at the last line of efi_init:
>         /* clean DUMMY object */
>         efi.set_variable(efi_dummy_name, &EFI_DUMMY_GUID,
>                          EFI_VARIABLE_NON_VOLATILE |
>                          EFI_VARIABLE_BOOTSERVICE_ACCESS |
>                          EFI_VARIABLE_RUNTIME_ACCESS,
>                          0, NULL);
> 
> Below is the dmesg:
> [    0.003359] pid_max: default: 32768 minimum: 301
> [    0.004792] BUG: unable to handle kernel paging request at fffffffefde97e70
> [    0.006666] IP: [<ffffffff8103a1db>] virt_efi_set_variable+0x40/0x54
> [    0.006666] PGD 36981067 PUD 35828063 PMD 0

Here it is - fffffffefde97e70 is not mapped in the pagetable, PMD is 0.

Ok, can you upload your patches somewhere and tell me exactly how to
reproduce this so that I can take a look too?

Thanks.

-- 
Regards/Gruss,
    Boris.

Sent from a fat crate under my desk. Formatting is fine.
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