From: Borislav Petkov <bp@alien8.de>
To: "Luck, Tony" <tony.luck@intel.com>
Cc: "Williams, Dan J" <dan.j.williams@intel.com>,
Linux NVDIMM <nvdimm@lists.linux.dev>,
Jane Chu <jane.chu@oracle.com>,
Luis Chamberlain <mcgrof@suse.com>
Subject: Re: [RFT PATCH] x86/pat: Fix set_mce_nospec() for pmem
Date: Thu, 30 Sep 2021 21:30:06 +0200 [thread overview]
Message-ID: <YVYQPtQrlKFCXPyd@zn.tnic> (raw)
In-Reply-To: <3b3266266835447aa668a244ae4e1baf@intel.com>
On Thu, Sep 30, 2021 at 05:28:12PM +0000, Luck, Tony wrote:
> > Question is, can we even access a hwpoisoned page to retrieve that data
> > or are we completely in the wrong weeds here? Tony?
>
> Hardware scope for poison is a cache line (64 bytes for DDR, may be larger
> for the internals of 3D-Xpoint memory).
I don't mean from the hw aspect but from the OS one: my simple thinking
is, *if* a page is marked as HW poison, any further mapping or accessing
of the page frame is prevented by the mm code.
So you can't access *any* bits there so why do we even bother with whole
or not whole page? Page is gone...
--
Regards/Gruss,
Boris.
https://people.kernel.org/tglx/notes-about-netiquette
next prev parent reply other threads:[~2021-09-30 19:30 UTC|newest]
Thread overview: 48+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-07-07 1:01 [RFT PATCH] x86/pat: Fix set_mce_nospec() for pmem Dan Williams
2021-08-26 19:08 ` Dan Williams
2021-08-27 7:12 ` Jane Chu
2021-09-13 10:29 ` Borislav Petkov
2021-09-14 18:08 ` Dan Williams
2021-09-15 10:41 ` Borislav Petkov
2021-09-16 20:33 ` Dan Williams
2021-09-17 11:30 ` Borislav Petkov
2021-09-21 2:04 ` Dan Williams
2021-09-30 17:19 ` Borislav Petkov
2021-09-30 17:28 ` Luck, Tony
2021-09-30 19:30 ` Borislav Petkov [this message]
2021-09-30 19:41 ` Dan Williams
2021-09-30 19:44 ` Luck, Tony
2021-09-30 20:01 ` Borislav Petkov
2021-09-30 20:15 ` Luck, Tony
2021-09-30 20:32 ` Borislav Petkov
2021-09-30 20:39 ` Dan Williams
2021-09-30 20:54 ` Borislav Petkov
2021-09-30 21:05 ` Dan Williams
2021-09-30 21:20 ` Borislav Petkov
2021-09-30 21:41 ` Dan Williams
2021-09-30 22:35 ` Borislav Petkov
2021-09-30 22:44 ` Dan Williams
2021-10-01 10:41 ` Borislav Petkov
2021-10-01 0:43 ` Jane Chu
2021-10-01 2:02 ` Dan Williams
2021-10-01 10:50 ` Borislav Petkov
2021-10-01 16:52 ` Dan Williams
2021-10-01 18:11 ` Borislav Petkov
2021-10-01 18:29 ` Dan Williams
2021-10-02 10:17 ` Borislav Petkov
2021-11-11 0:06 ` Jane Chu
2021-11-12 0:30 ` Jane Chu
2021-11-12 0:51 ` Dan Williams
2021-11-12 17:57 ` Jane Chu
2021-11-12 19:24 ` Dan Williams
2021-11-12 22:35 ` Jane Chu
2021-11-12 22:50 ` Jane Chu
2021-11-12 23:08 ` Dan Williams
2021-11-13 5:50 ` Jane Chu
2021-11-13 20:47 ` Dan Williams
2021-11-18 19:03 ` Jane Chu
2021-11-25 0:16 ` Dan Williams
2021-11-30 23:00 ` Jane Chu
2021-09-30 18:15 ` Jane Chu
2021-09-30 19:11 ` Dan Williams
2021-09-30 21:23 ` Jane Chu
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