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From: Dave Young <dyoung@redhat.com>
To: Jean Delvare <jdelvare@suse.de>
Cc: Andy Shevchenko <andriy.shevchenko@linux.intel.com>,
	kexec@lists.infradead.org,
	Mika Westerberg <mika.westerberg@linux.intel.com>,
	Eric Biederman <ebiederm@xmission.com>,
	linux-kernel@vger.kernel.org, linux-efi@vger.kernel.org,
	matt@codeblueprint.co.uk, ard.biesheuvel@linaro.org
Subject: Re: [PATCH v1 2/2] firmware: dmi_scan: Pass dmi_entry_point to kexec'ed kernel
Date: Sat, 17 Dec 2016 18:57:21 +0800	[thread overview]
Message-ID: <20161217105721.GB6922@dhcp-128-65.nay.redhat.com> (raw)
In-Reply-To: <20161216143330.69e9c8ee@endymion>

Ccing efi people.

On 12/16/16 at 02:33pm, Jean Delvare wrote:
> On Fri, 16 Dec 2016 14:18:58 +0200, 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:
> > > > 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.
> 
> If it was done for X86_64 then maybe it can be generalized to X86?

For X86_64, we have a new way for efi runtime memmory mapping, in i386
code it still use old ioremap way. It is impossible to use same way as
the X86_64 since the virtual address space is limited.

But maybe for 32bit, kexec kernel can run in physical mode, but I'm not
sure, I would suggest Andy to do a test first with efi=noruntime for
kexec 2nd kernel.

Thanks
Dave

> 
> -- 
> Jean Delvare
> SUSE L3 Support

       reply	other threads:[~2016-12-17 10:57 UTC|newest]

Thread overview: 34+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <20161202195416.58953-1-andriy.shevchenko@linux.intel.com>
     [not found] ` <20161202195416.58953-3-andriy.shevchenko@linux.intel.com>
     [not found]   ` <20161215122856.7d24b7a8@endymion>
     [not found]     ` <20161216023213.GA4505@dhcp-128-65.nay.redhat.com>
     [not found]       ` <1481890738.9552.70.camel@linux.intel.com>
     [not found]         ` <20161216143330.69e9c8ee@endymion>
2016-12-17 10:57           ` Dave Young [this message]
2019-09-06 19:00             ` [PATCH v1 2/2] firmware: dmi_scan: Pass dmi_entry_point to kexec'ed kernel Andy Shevchenko
2020-01-20 12:19             ` Andy Shevchenko
2020-01-20 16:04               ` Eric W. Biederman
2020-01-20 21:42                 ` Jean Delvare
2020-01-20 21:55                   ` Andy Shevchenko
2020-01-21  9:03                     ` Jean Delvare
2020-01-21 16:29                       ` Eric W. Biederman
2020-01-21 17:24                         ` Andy Shevchenko
2020-01-20 22:31                 ` Andy Shevchenko
2020-01-20 23:18                   ` Ard Biesheuvel
2020-01-21 15:37                     ` Andy Shevchenko
2020-01-21 17:17                       ` Eric W. Biederman
2020-05-21 17:39                         ` Andy Shevchenko
2021-06-02  8:37                     ` Andy Shevchenko
2021-06-02  8:53                       ` Andy Shevchenko
2021-06-02  8:42 ` [PATCH v1 0/2] firmware: dmi_scan: Make it work in " Andy Shevchenko
2021-06-02  8:53   ` Andy Shevchenko
2021-06-05  7:51     ` Dave Young
2021-06-07 16:22       ` Andy Shevchenko
2021-06-07 17:18         ` Andy Shevchenko
2021-06-08 12:25           ` Dave Young
2021-06-08 12:38             ` Andy Shevchenko
2021-06-09 11:55               ` Dave Young
2021-06-12  4:40                 ` Dave Young
2021-06-14 15:38                   ` Andy Shevchenko
2021-06-14 17:07                     ` Andy Shevchenko
2021-06-14 17:27                       ` Andy Shevchenko
2021-07-19  7:53                         ` Ard Biesheuvel
2021-07-19  8:25                           ` Andy Shevchenko
2021-10-06 16:28                         ` Andy Shevchenko
2021-10-07  7:20                           ` Ard Biesheuvel
2021-10-07  7:23                             ` Andy Shevchenko
2021-10-17 13:31                               ` Ard Biesheuvel

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