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Bug#1029674: linux: Enable the 5-level paging support

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  Bug#1029674: linux: Enable the 5-level paging support Miguel Bernal Marin <miguel.bernal.marin@gmail.com> - 2023-01-26 10:30 +0100
    Bug#1029674: marked as done (linux: Enable the 5-level paging  support) "Debian Bug Tracking System" <owner@bugs.debian.org> - 2023-01-29 17:10 +0100

#78075 — Bug#1029674: linux: Enable the 5-level paging support

Source: linux
Version: 6.1.7-1
Severity: wishlist
Tags: patch, sid
X-Debbugs-Cc: miguel.bernal.marin@linux.intel.com, jair.de.jesus.gonzalez.plascencia@intel.com

Dear Maintainer,

Please enable the 5-level paging support.

Original x86-64 was limited by 4-level paging to 256 TiB of virtual
address space and 64 TiB of physical address space. We are already
bumping into this limit: some vendors offers servers with 64 TiB of
memory today.

To overcome the limitation upcoming hardware will introduce support
for 5-level paging. It is a straight-forward extension of the current
page table structure adding one more layer of translation.

It bumps the limits to 128 PiB of virtual address space and 4 PiB of
physical address space.

In Debian this feature was added as disabled at 998b27af2f57 ("Explicitly
set various config symbols to their default values") [1], but in Linux
upstream at 18ec1eaf58fb ("x86/mm: Enable 5-level paging support by default")
[2] it was flip to default-y. 

A merge request against SID was made at:

https://salsa.debian.org/kernel-team/linux/-/merge_requests/647

I don't know if this fix should be propagated to others branches.

[1] https://salsa.debian.org/kernel-team/linux/-/commit/998b27af2f57
[2] https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=18ec1eaf58fb

Thanks,
Miguel

-- System Information:
Debian Release: bookworm/sid
  APT prefers unstable
  APT policy: (500, 'unstable'), (500, 'testing')
Architecture: amd64 (x86_64)

Kernel: Linux 6.1.0-2-amd64 (SMP w/4 CPU threads; PREEMPT)
Locale: LANG=en_US.UTF-8, LC_CTYPE=en_US.UTF-8 (charmap=UTF-8), LANGUAGE not set
Shell: /bin/sh linked to /usr/bin/dash
Init: systemd (via /run/systemd/system)
LSM: AppArmor: enabled

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#78123 — Bug#1029674: marked as done (linux: Enable the 5-level paging support)

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Your message dated Sun, 29 Jan 2023 16:02:55 +0000
with message-id <E1pMA8t-008Bvz-3p@fasolo.debian.org>
and subject line Bug#1029674: fixed in linux 6.1.8-1
has caused the Debian Bug report #1029674,
regarding linux: Enable the 5-level paging support
to be marked as done.

This means that you claim that the problem has been dealt with.
If this is not the case it is now your responsibility to reopen the
Bug report if necessary, and/or fix the problem forthwith.

(NB: If you are a system administrator and have no idea what this
message is talking about, this may indicate a serious mail system
misconfiguration somewhere. Please contact owner@bugs.debian.org
immediately.)


-- 
1029674: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1029674
Debian Bug Tracking System
Contact owner@bugs.debian.org with problems

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