From: Jari Ruusu <jari.ruusu@gmail.com>
To: Borislav Petkov <bp@alien8.de>, Fenghua Yu <fenghua.yu@intel.com>,
Luis Chamberlain <mcgrof@kernel.org>,
Linus Torvalds <torvalds@linux-foundation.org>
Cc: linux-kernel@vger.kernel.org, stable@vger.kernel.org
Subject: Re: Fix built-in early-load Intel microcode alignment
Date: Sun, 12 Jan 2020 15:03:44 +0200 [thread overview]
Message-ID: <CACMCwJ+FE8yD10VF07ci6tTqiBA8aBejKQT0EwyayQQOrLGUKQ@mail.gmail.com> (raw)
In-Reply-To: <CACMCwJK-2DHZDA_F5Z3wsEUEKJSc3uOwwPD4HRoYGW7A+kA75w@mail.gmail.com>
On 1/12/20, Jari Ruusu <jari.ruusu@gmail.com> wrote:
> Intel Software Developer's Manual, volume 3, chapter 9.11.6 says:
> "Note that the microcode update must be aligned on a 16-byte
> boundary and the size of the microcode update must be 1-KByte
> granular"
>
> When early-load Intel microcode is loaded from initramfs,
> userspace tool 'iucode_tool' has already 16-byte aligned those
> microcode bits in that initramfs image. Image that was created
> something like this:
>
> iucode_tool --write-earlyfw=FOO.cpio microcode-files...
>
> However, when early-load Intel microcode is loaded from built-in
> firmware BLOB using CONFIG_EXTRA_FIRMWARE= kernel config option,
> that 16-byte alignment is not guaranteed.
>
> Fix this by forcing all built-in firmware BLOBs to 16-byte
> alignment.
Backport of "Fix built-in early-load Intel microcode alignment"
for linux-4.19 and older stable kernels.
Signed-off-by: Jari Ruusu <jari.ruusu@gmail.com>
--- a/firmware/Makefile
+++ b/firmware/Makefile
@@ -19,7 +19,7 @@
PROGBITS=$(if $(CONFIG_ARM),%,@)progbits; \
echo "/* Generated by firmware/Makefile */" > $@;\
echo " .section .rodata" >>$@;\
- echo " .p2align $${ASM_ALIGN}" >>$@;\
+ echo " .p2align 4" >>$@;\
echo "_fw_$${FWSTR}_bin:" >>$@;\
echo " .incbin \"$(2)\"" >>$@;\
echo "_fw_end:" >>$@;\
--
Jari Ruusu 4096R/8132F189 12D6 4C3A DCDA 0AA4 27BD ACDF F073 3C80 8132 F189
next prev parent reply other threads:[~2020-01-12 13:03 UTC|newest]
Thread overview: 24+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-01-12 13:00 Fix built-in early-load Intel microcode alignment Jari Ruusu
2020-01-12 13:03 ` Jari Ruusu [this message]
2020-01-12 14:02 ` Greg KH
2020-01-13 6:30 ` Jari Ruusu
2020-01-13 6:42 ` Greg KH
2020-01-13 15:47 ` Luis Chamberlain
2020-01-13 19:44 ` Linus Torvalds
2020-01-15 2:27 ` Luis Chamberlain
2020-01-18 20:10 ` Bjorn Andersson
2020-01-13 19:58 ` Jari Ruusu
2020-01-13 20:08 ` Borislav Petkov
2020-01-13 20:30 ` Jari Ruusu
2020-01-13 20:46 ` Borislav Petkov
2020-01-15 2:15 ` Luis Chamberlain
2020-01-15 18:46 ` Jari Ruusu
2020-01-15 18:58 ` Luis Chamberlain
2020-01-15 19:41 ` Linus Torvalds
2020-01-15 19:00 ` Andy Lutomirski
2020-01-15 19:15 ` Jari Ruusu
2020-01-15 19:49 ` Linus Torvalds
2020-01-16 6:55 ` Jari Ruusu
2020-01-16 19:16 ` Raj, Ashok
2020-01-17 9:47 ` Jari Ruusu
2020-02-03 20:10 ` Luis Chamberlain
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=CACMCwJ+FE8yD10VF07ci6tTqiBA8aBejKQT0EwyayQQOrLGUKQ@mail.gmail.com \
--to=jari.ruusu@gmail.com \
--cc=bp@alien8.de \
--cc=fenghua.yu@intel.com \
--cc=linux-kernel@vger.kernel.org \
--cc=mcgrof@kernel.org \
--cc=stable@vger.kernel.org \
--cc=torvalds@linux-foundation.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;
as well as URLs for NNTP newsgroup(s).