linux-kernel - Re: [PATCH v4 07/12] efi: passing kexec necessary efi data via setup

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Message-ID: <20131205015615.GC3736@dhcp-16-126.nay.redhat.com>
Date:	Thu, 5 Dec 2013 09:56:15 +0800
From:	Dave Young <dyoung@...hat.com>
To:	Toshi Kani <toshi.kani@...com>
Cc:	Borislav Petkov <bp@...en8.de>, linux-kernel@...r.kernel.org,
	linux-efi@...r.kernel.org, x86@...nel.org, mjg59@...f.ucam.org,
	hpa@...or.com, James.Bottomley@...senPartnership.com,
	vgoyal@...hat.com, ebiederm@...ssion.com, horms@...ge.net.au,
	kexec@...ts.infradead.org, greg@...ah.com, matt@...sole-pimps.org
Subject: Re: [PATCH v4 07/12] efi: passing kexec necessary efi data via
 setup_data

On 12/04/13 at 09:43am, Toshi Kani wrote:
> On Wed, 2013-12-04 at 10:46 +0800, Dave Young wrote:
> > Hi, Toshi
> > 
> > > Oh, I think I now understand what the issue was.  The z420 firmware
> > > updates the SMBIOS table address in the EFI system table to a virtual
> > > address after calling EFI SetVirtualAddressMap.  So, you are passing the
> > > original physical address of the SMBIOS table from the 1st kernel to the
> > > 2nd kernel to put it back to physical.  Is that right? 
> > 
> > Right.
> 
> Hi Dave,
> 
> The z420 firmware is based on some UEFI core that may be used by other
> vendors as well.  Since this handling is totally harmless (just
> redundant), I'd suggest not to have a platform check on this handling.

I have same worry as well, so I agree with you.

Thanks
Dave
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