From: Alison Schofield <alison.schofield@intel.com>
To: Dave Hansen <dave.hansen@intel.com>
Cc: "Rafael J. Wysocki" <rafael@kernel.org>,
Len Brown <lenb@kernel.org>,
Dan Williams <dan.j.williams@intel.com>,
Thomas Gleixner <tglx@linutronix.de>,
Ingo Molnar <mingo@redhat.com>, Borislav Petkov <bp@alien8.de>,
Dave Hansen <dave.hansen@linux.intel.com>,
"H. Peter Anvin" <hpa@zytor.com>,
Andy Lutomirski <luto@kernel.org>,
Peter Zijlstra <peterz@infradead.org>,
Andrew Morton <akpm@linux-foundation.org>,
Jonathan Cameron <Jonathan.Cameron@huawei.com>,
Dave Jiang <dave.jiang@intel.com>,
x86@kernel.org, linux-cxl@vger.kernel.org,
linux-acpi@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH 1/2] x86/numa: Introduce numa_fill_memblks()
Date: Thu, 18 May 2023 17:26:03 -0700 [thread overview]
Message-ID: <ZGbCG4gRGow0VCmQ@aschofie-mobl2> (raw)
In-Reply-To: <8dc725c8-613a-b51b-6cc1-80d2275ca130@intel.com>
On Thu, May 18, 2023 at 05:08:16PM -0700, Dave Hansen wrote:
> On 5/18/23 17:04, alison.schofield@intel.com wrote:
> > The initial use case is the ACPI driver that needs to extend
> > SRAT defined proximity domains to an entire CXL CFMWS Window[1].
>
> Dumb question time: Why didn't the SRAT just cover this sucker in the
> first place? Are we fixing up a BIOS bug or is there a legitimate
> reason that the SRAT didn't cover it up front?
>
>
There is no requirement that the BIOS describe (in the SRAT) all the
HPA assigned to a CFMWS Window. The HPA range may not actually map to
any memory at boot time. It can be persistent capacity or may be there
to enable hot-plug. IIUC BIOS can pick and choose and define volatile
regions wherever it pleases.
So, no we're not fixing up a BIOS bug, nor doing a BIOS sanity check.
next prev parent reply other threads:[~2023-05-19 0:26 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-05-19 0:04 [PATCH 0/2] CXL: Apply SRAT defined PXM to entire CFMWS window alison.schofield
2023-05-19 0:04 ` [PATCH 1/2] x86/numa: Introduce numa_fill_memblks() alison.schofield
2023-05-19 0:08 ` Dave Hansen
2023-05-19 0:26 ` Alison Schofield [this message]
2023-05-19 0:40 ` Dan Williams
2023-05-19 0:43 ` Dave Hansen
2023-05-19 1:56 ` Dan Williams
2023-06-03 23:53 ` Dan Williams
2023-06-06 20:03 ` Alison Schofield
2023-06-06 20:45 ` Dan Williams
2023-06-07 10:44 ` Mike Rapoport
2023-05-19 0:04 ` [PATCH 2/2] ACPI: NUMA: Apply SRAT proximity domain to entire CFMWS window alison.schofield
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=ZGbCG4gRGow0VCmQ@aschofie-mobl2 \
--to=alison.schofield@intel.com \
--cc=Jonathan.Cameron@huawei.com \
--cc=akpm@linux-foundation.org \
--cc=bp@alien8.de \
--cc=dan.j.williams@intel.com \
--cc=dave.hansen@intel.com \
--cc=dave.hansen@linux.intel.com \
--cc=dave.jiang@intel.com \
--cc=hpa@zytor.com \
--cc=lenb@kernel.org \
--cc=linux-acpi@vger.kernel.org \
--cc=linux-cxl@vger.kernel.org \
--cc=linux-kernel@vger.kernel.org \
--cc=luto@kernel.org \
--cc=mingo@redhat.com \
--cc=peterz@infradead.org \
--cc=rafael@kernel.org \
--cc=tglx@linutronix.de \
--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