From: Juergen Gross <jgross@suse.com>
To: Dave Hansen <dave.hansen@intel.com>, Borislav Petkov <bp@alien8.de>
Cc: xen-devel@lists.xenproject.org, x86@kernel.org,
linux-kernel@vger.kernel.org, jbeulich@suse.com,
Dave Hansen <dave.hansen@linux.intel.com>,
Andy Lutomirski <luto@kernel.org>,
Peter Zijlstra <peterz@infradead.org>,
Thomas Gleixner <tglx@linutronix.de>,
Ingo Molnar <mingo@redhat.com>, "H. Peter Anvin" <hpa@zytor.com>
Subject: Re: [PATCH 1/2] x86/pat: fix x86_has_pat_wp()
Date: Mon, 20 Jun 2022 17:34:42 +0200 [thread overview]
Message-ID: <ddb0cc0d-cefc-4f33-23f8-3a94c7c51a49@suse.com> (raw)
In-Reply-To: <63ccccac-2aa7-8850-9cd3-a8b7b89e1872@intel.com>
[-- Attachment #1.1.1: Type: text/plain, Size: 734 bytes --]
On 20.06.22 17:27, Dave Hansen wrote:
> On 6/20/22 03:41, Juergen Gross wrote:
>>> But I'm only guessing - this needs a *lot* more elaboration and
>>> explanation why exactly this is needed.
>>
>> I will correct the code and update the commit message.
>
> It would also be great to cover the end-user-visible impact of the bug
> and the fix. It _looks_ like it will probably only affect an SEV
> system's ability to read some EFI data. That will presumably be pretty
> bad because it ends up reading from an encrypted mapping instead of a
> decrypted one.
Xen doesn't support SEV guests yet. So the only caveat here would be EFI
setting up PAT by itself.
Not sure this is really a real world issue.
Juergen
[-- Attachment #1.1.2: OpenPGP public key --]
[-- Type: application/pgp-keys, Size: 3149 bytes --]
[-- Attachment #2: OpenPGP digital signature --]
[-- Type: application/pgp-signature, Size: 495 bytes --]
next prev parent reply other threads:[~2022-06-20 15:34 UTC|newest]
Thread overview: 41+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-05-03 13:22 [PATCH 0/2] x86/pat: fix querying available caching modes Juergen Gross
2022-05-03 13:22 ` [PATCH 1/2] x86/pat: fix x86_has_pat_wp() Juergen Gross
2022-05-27 10:21 ` Juergen Gross
2022-06-14 15:09 ` Juergen Gross
2022-06-20 5:22 ` Thorsten Leemhuis
2022-06-20 5:30 ` Juergen Gross
2022-06-20 6:15 ` Thorsten Leemhuis
2022-06-20 10:26 ` Borislav Petkov
2022-06-20 10:41 ` Juergen Gross
2022-06-20 15:27 ` Dave Hansen
2022-06-20 15:34 ` Juergen Gross [this message]
2022-05-03 13:22 ` [PATCH 2/2] x86/pat: add functions to query specific cache mode availability Juergen Gross
2022-05-04 8:31 ` Jan Beulich
2022-05-04 9:14 ` Juergen Gross
2022-05-04 9:51 ` Jan Beulich
2022-05-20 4:43 ` Chuck Zmudzinski
2022-05-20 5:56 ` Chuck Zmudzinski
2022-05-20 6:05 ` Jan Beulich
2022-05-20 6:59 ` Chuck Zmudzinski
2022-05-20 8:30 ` Chuck Zmudzinski
2022-05-20 9:41 ` Jan Beulich
2022-05-20 13:33 ` Chuck Zmudzinski
2022-05-20 14:06 ` Jan Beulich
2022-05-20 14:48 ` Chuck Zmudzinski
2022-05-21 10:47 ` Thorsten Leemhuis
2022-05-24 18:32 ` Chuck Zmudzinski
2022-05-25 7:45 ` Thorsten Leemhuis
2022-05-25 8:04 ` Juergen Gross
2022-05-25 8:37 ` Jan Beulich
2022-05-25 8:51 ` Thorsten Leemhuis
2022-05-25 19:25 ` Chuck Zmudzinski
2022-05-20 15:46 ` [REGRESSION} " Chuck Zmudzinski
2022-05-20 17:13 ` Chuck Zmudzinski
2022-05-20 17:17 ` Chuck Zmudzinski
2022-05-18 13:45 ` Christoph Hellwig
2022-05-20 2:15 ` Chuck Zmudzinski
2022-05-20 2:21 ` Chuck Zmudzinski
2022-05-21 13:24 ` Chuck Zmudzinski
2022-07-11 9:46 ` [tip: x86/urgent] x86/pat: Fix x86_has_pat_wp() tip-bot2 for Juergen Gross
2022-07-13 10:45 ` tip-bot2 for Juergen Gross
2022-07-13 10:52 ` tip-bot2 for Juergen Gross
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=ddb0cc0d-cefc-4f33-23f8-3a94c7c51a49@suse.com \
--to=jgross@suse.com \
--cc=bp@alien8.de \
--cc=dave.hansen@intel.com \
--cc=dave.hansen@linux.intel.com \
--cc=hpa@zytor.com \
--cc=jbeulich@suse.com \
--cc=linux-kernel@vger.kernel.org \
--cc=luto@kernel.org \
--cc=mingo@redhat.com \
--cc=peterz@infradead.org \
--cc=tglx@linutronix.de \
--cc=x86@kernel.org \
--cc=xen-devel@lists.xenproject.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).