linux-kernel - Re: [PATCH v1 2/2] firmware: dmi_scan: Pass dmi_entry

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Message-ID: <20161217105059.GA6922@dhcp-128-65.nay.redhat.com>
Date:   Sat, 17 Dec 2016 18:50:59 +0800
From:   Dave Young <dyoung@...hat.com>
To:     Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Cc:     Jean Delvare <jdelvare@...e.de>, kexec@...ts.infradead.org,
        Mika Westerberg <mika.westerberg@...ux.intel.com>,
        Eric Biederman <ebiederm@...ssion.com>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v1 2/2] firmware: dmi_scan: Pass dmi_entry_point to
 kexec'ed kernel

On 12/16/16 at 02:18pm, Andy Shevchenko wrote:
> On Fri, 2016-12-16 at 10:32 +0800, Dave Young wrote:
> > On 12/15/16 at 12:28pm, Jean Delvare wrote:
> > > Hi Andy,
> > > 
> > > On Fri,  2 Dec 2016 21:54:16 +0200, Andy Shevchenko wrote:
> > > > Until now kexec'ed kernel has no clue where to look for DMI entry
> > > > point.
> > > > 
> > > > Pass it via kernel command line parameter in the same way as it's
> > > > done for ACPI
> > > > RSDP.
> > > 
> > > I am no kexec expert but this confuses me. Shouldn't the second
> > > kernel
> > > have access to the EFI systab as the first kernel does? It includes
> > > many more pointers than just ACPI and DMI tables, and it would seem
> > > inconvenient to have to pass all these addresses individually
> > > explicitly.
> > 
> > Yes, in modern linux kernel, kexec has the support for EFI, I think it
> > should work naturally at least in x86_64.
> 
> Thanks for this good news!
> 
> Unfortunately Intel Galileo is 32-bit platform.

Maybe you can try use efi=noruntime kernel parameter in kexec/kdump
kernel, see if it works or not.

> 
> -- 
> Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
> Intel Finland Oy