From: Borislav Petkov <bp@alien8.de>
To: Andy Lutomirski <luto@amacapital.net>
Cc: X86 ML <x86@kernel.org>, LKML <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH 3/5] x86-64, docs, mm: Add vsyscall range to virtual address space layout
Date: Mon, 4 Mar 2013 22:56:39 +0100 [thread overview]
Message-ID: <20130304215639.GH22274@pd.tnic> (raw)
In-Reply-To: <513515F0.7050603@mit.edu>
On Mon, Mar 04, 2013 at 01:45:20PM -0800, Andy Lutomirski wrote:
> vsyscalls are only 4k. Am I missing something obvious her?
Right, but we're reserving 5 level2 pages for this, i.e. 5*512*4K = 10M.
I.e., each level2 page contains 512 ptes, each pointing to a 4K page.
arch/x86/kernel/head_64.S:
...
NEXT_PAGE(level2_fixmap_pgt)
.fill 506,8,0
.quad level1_fixmap_pgt - __START_KERNEL_map + _PAGE_TABLE
/* 8MB reserved for vsyscalls + a 2MB hole = 4 + 1 entries */
.fill 5,8,0
NEXT_PAGE(level1_fixmap_pgt)
.fill 512,8,0
--
Regards/Gruss,
Boris.
Sent from a fat crate under my desk. Formatting is fine.
--
next prev parent reply other threads:[~2013-03-04 21:56 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-03-04 20:16 [PATCH 0/5] x86: Misc fixlets Borislav Petkov
2013-03-04 20:16 ` [PATCH 1/5] x86, smpboot: Remove unused variable Borislav Petkov
2013-03-06 0:24 ` [tip:x86/urgent] " tip-bot for Borislav Petkov
2013-03-04 20:16 ` [PATCH 2/5] x86: Drop KERNEL_IMAGE_START Borislav Petkov
2013-04-03 0:18 ` [tip:x86/cleanups] " tip-bot for Borislav Petkov
2013-03-04 20:16 ` [PATCH 3/5] x86-64, docs, mm: Add vsyscall range to virtual address space layout Borislav Petkov
2013-03-04 21:45 ` Andy Lutomirski
2013-03-04 21:56 ` Borislav Petkov [this message]
2013-04-03 0:19 ` [tip:x86/cleanups] " tip-bot for Borislav Petkov
2013-03-04 20:16 ` [PATCH 4/5] x86, msr: Unify variable names Borislav Petkov
2013-04-03 0:20 ` [tip:x86/cleanups] " tip-bot for Borislav Petkov
2013-03-04 20:16 ` [PATCH 5/5] x86, quirks: Shut-up a long-standing gcc warning Borislav Petkov
2013-04-03 0:21 ` [tip:x86/cleanups] " tip-bot for Borislav Petkov
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