linux-kernel - [PATCH 00 of 11] x86: separate pmd lifetime from pgd

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [thread-next>] [day] [month] [year] [list]

Date:	Fri, 25 Jan 2008 13:23:09 -0800
From:	Jeremy Fitzhardinge <jeremy@...p.org>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	LKML <linux-kernel@...r.kernel.org>, Andi Kleen <ak@...e.de>,
	Jan Beulich <jbeulich@...ell.com>,
	Eduardo Pereira Habkost <ehabkost@...hat.com>,
	Ian Campbell <ijc@...lion.org.uk>,
	H Peter Anvin <hpa@...or.com>
Subject: [PATCH 00 of 11] x86: separate pmd lifetime from pgd

Hi Ingo,

This series addresses various cleanups in pagetable allocation in the
direction of unifying 32/64 bits (that's still a while off yet).

The significant change in here is that I'm separating the lifetime of
a pmd from its pgd in the 32-bit PAE case.  This makes it logically
the same as 64-bit pagetable allocation, and it overall simplifies the
code.

The patches are:
 - A pure Xen fix I tacked on for convenience
 - Use the same pgd_list mechanism for 32 and 64 bits
 - Add an mm parameter for paravirt_alloc_pd, for consistency
 - Some fixes to early_ioremap to make sure the right paravirt
   hooks are called appropriately
 - de-macro asm-x86/pgalloc_32.h
 - make mm/pgtable_32.c:pgd_ctor a single function
 - dynamically allocate pmds rather than always allocating
   them with the pgd
 - Add Xen bits for dealing with pmd allocation
 - Preallocate pmds to avoid excessive tlb flushes
 - Allocate and initialize kernel pmds when they're not shared
 - Avoid excessive tlb flushes when pulling down pmds.

I've done a number of randconfig test builds to shake out various
configurations on 32 nd 64 bits.

One caveat: in order to demacro pgalloc_32.h, I had to rearrange some
headers in asm-generic/tlb.h, as it was including asm/pgalloc.h for no
good reason.  As a result, any other file which was expecting to
implicitly pick up asm/pgalloc.h when including a asm/tlb.h header may
get header file problems.  I have not done any cross builds to try and
track down any non-x86 fallout from this.

Thanks,
	J

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/