From: geoff.levand@linaro.org (Geoff Levand)
To: linux-arm-kernel@lists.infradead.org
Subject: [RFC PATCH] arm64/efi: use stable virtual mappings for UEFI runtime services
Date: Mon, 13 Oct 2014 15:52:46 -0700 [thread overview]
Message-ID: <1413240766.31184.69.camel@smoke> (raw)
In-Reply-To: <1412789936-4908-1-git-send-email-ard.biesheuvel@linaro.org>
Hi Ard,
On Wed, 2014-10-08 at 19:38 +0200, Ard Biesheuvel wrote:
> I haven't tested this code under kexec myself, but I have confirmed that
> the runtime services work as expected (rtc-efi and efivars). The comments
> that Mark Salter and Will Deacon gave on the id mapping patch here
I applied this patch to my kexec master branch [1] and tested a basic
kexec re-boot using the FVP_Base_AEMv8A-AEMv8A_0.8_5602 model and the
14.09 LEG EFI build.
It crashes when the 2nd stage kernel is starting up on the first
dereference of the c16 variable in uefi_init():
c16 = early_memremap(efi.systab->fw_vendor, sizeof(vendor));
if (c16) {
for (i = 0; i < (int) sizeof(vendor) - 1 && *c16; ++i) {
^^^^ crashes here
early_memremap() returns 0xFFFFFFBFFBCBF618, and the dereference
starts the crash. I did not look into it further.
[1] https://git.linaro.org/people/geoff.levand/linux-kexec.git
-Geoff
next prev parent reply other threads:[~2014-10-13 22:52 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-10-08 17:38 [RFC PATCH] arm64/efi: use stable virtual mappings for UEFI runtime services Ard Biesheuvel
2014-10-13 22:52 ` Geoff Levand [this message]
2014-10-14 2:17 ` Dave Young
2014-10-14 10:26 ` Ard Biesheuvel
2014-10-14 12:44 ` Vivek Goyal
2014-10-14 13:55 ` Ard Biesheuvel
2014-10-14 16:53 ` Geoff Levand
2014-10-14 22:26 ` Ard Biesheuvel
2014-10-14 10:42 ` Mark Rutland
2014-10-15 7:08 ` Dave Young
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=1413240766.31184.69.camel@smoke \
--to=geoff.levand@linaro.org \
--cc=linux-arm-kernel@lists.infradead.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox