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

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Date:	Sun, 22 Sep 2013 22:00:39 +0800
From:	Dave Young <dyoung@...hat.com>
To:	Borislav Petkov <bp@...en8.de>
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 09/22/13 at 03:37pm, Borislav Petkov wrote:
> 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?

Yes, it's 2nd kernel.

> 
> > 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?

Ok, will put somewhere after a little cleanup today.

> 
> Thanks.
> 
> -- 
> Regards/Gruss,
>     Boris.
> 
> Sent from a fat crate under my desk. Formatting is fine.
> --
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