From: Boris Ostrovsky <boris.ostrovsky@oracle.com>
To: Thomas Gleixner <tglx@linutronix.de>
Cc: Borislav Petkov <bp@alien8.de>,
thomas.lendacky@amd.com, X86 ML <x86@kernel.org>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
Ingo Molnar <mingo@redhat.com>, "H. Peter Anvin" <hpa@zytor.com>
Subject: Re: SME/32-bit regression
Date: Wed, 6 Sep 2017 10:03:27 -0400 [thread overview]
Message-ID: <49cfbec8-df6f-5eed-0639-53c6bb3eaab2@oracle.com> (raw)
In-Reply-To: <alpine.DEB.2.20.1709061557180.1843@nanos>
On 09/06/2017 09:57 AM, Thomas Gleixner wrote:
> On Wed, 6 Sep 2017, Boris Ostrovsky wrote:
>> On 09/06/2017 05:26 AM, Borislav Petkov wrote:
>>> On Tue, Sep 05, 2017 at 11:45:07PM -0400, Boris Ostrovsky wrote:
>>>> It appears there is a regression for 32-bit kernels due to SME changes.
>>>>
>>>> I bisected my particular problem
>>> It being? Doesn't boot, splats?
>> Xen guest crashes very early, before a splat can can be generated.
>>
>>>> (Xen PV guest) to
>>>> 21729f81ce8ae76a6995681d40e16f7ce8075db4 but I also saw pmd_clear_bad()
>>>> errors on baremetal. This seems to be caused by sme_me_mask being an
>>>> unsigned long as opposed to phys_addr_t (the actual problem is that
>>>> __PHYSICAL_MASK is truncated). When I declare it as u64 and drop unsigned
>>>> long cast in __sme_set()/__sme_clr() the problem goes way. (This presumably
>>>> won't work for non-PAE which I haven't tried).
>>> Right, so I think we should do this because those macros should not have
>>> any effect on !CONFIG_AMD_MEM_ENCRYPT setups.
>> This won't help though if kernel is built with SME support.
> Which is not the case for 32bit. SME depends on 64bit
Oh, OK, I didn't realize that.
-boris
prev parent reply other threads:[~2017-09-06 14:04 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-09-06 3:45 SME/32-bit regression Boris Ostrovsky
2017-09-06 9:26 ` Borislav Petkov
2017-09-06 9:45 ` Borislav Petkov
[not found] ` <CY4PR12MB11415936E980489690575E65EC970@CY4PR12MB1141.namprd12.prod.outlook.com>
2017-09-06 16:44 ` Borislav Petkov
2017-09-06 18:06 ` Brijesh Singh
2017-09-06 18:19 ` Borislav Petkov
2017-09-06 21:03 ` Boris Ostrovsky
2017-09-07 0:26 ` Brijesh Singh
2017-09-07 9:38 ` [PATCH] x86/mm: Make the SME mask a u64 Borislav Petkov
2017-09-07 10:34 ` [tip:x86/urgent] " tip-bot for Borislav Petkov
2017-09-06 13:54 ` SME/32-bit regression Boris Ostrovsky
2017-09-06 13:57 ` Thomas Gleixner
2017-09-06 14:03 ` Boris Ostrovsky [this message]
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=49cfbec8-df6f-5eed-0639-53c6bb3eaab2@oracle.com \
--to=boris.ostrovsky@oracle.com \
--cc=bp@alien8.de \
--cc=hpa@zytor.com \
--cc=linux-kernel@vger.kernel.org \
--cc=mingo@redhat.com \
--cc=tglx@linutronix.de \
--cc=thomas.lendacky@amd.com \
--cc=x86@kernel.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).