From: Ingo Molnar <mingo@kernel.org>
To: Baoquan He <bhe@redhat.com>,
"Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>
Cc: linux-kernel@vger.kernel.org, x86@kernel.org,
linux-doc@vger.kernel.org, tglx@linutronix.de,
thgarnie@google.com, corbet@lwn.net,
Borislav Petkov <bp@alien8.de>, "H. Peter Anvin" <hpa@zytor.com>,
Andy Lutomirski <luto@kernel.org>,
Peter Zijlstra <a.p.zijlstra@chello.nl>,
Linus Torvalds <torvalds@linux-foundation.org>,
Andrew Morton <akpm@linux-foundation.org>
Subject: Re: [PATCH 4/3] x86/mm/doc: Enhance the x86-64 virtual memory layout descriptions
Date: Sat, 6 Oct 2018 14:33:22 +0200 [thread overview]
Message-ID: <20181006123322.GA60572@gmail.com> (raw)
In-Reply-To: <20181006122259.GB418@gmail.com>
* Ingo Molnar <mingo@kernel.org> wrote:
> +========================================================
> +| Complete virtual memory map with 4-level page tables |
> +========================================================
> +--------------------------------------------------------------------------------
> +start addr | offset | end addr | size | VM area description
> +-----------------|------------|------------------|---------|--------------------
> +
> +# Identical layout to the 56-bit one from here on:
> +
> +ffffff8000000000 | -512 GB | fffffffeefffffff | ~507 GB | ... unused hole
> +ffffffef00000000 | -68 GB | fffffffeffffffff | 64 GB | EFI region mapping space
> +========================================================
> +| Complete virtual memory map with 5-level page tables |
> +========================================================
> +ffffff8000000000 | -0.5 TB | ffffffeeffffffff | 444 GB | ... unused hole
> +
> +# Identical layout to the 47-bit one from here on:
> +
> +ffffffef00000000 | -68 GB | fffffffeffffffff | 64 GB | EFI region mapping space
So patch #2 appears to have introduced an error/typo in the 47-bit table. Note the weird size
and discontinuity of the 'unused hole' in the 47-bit table, and compare it with 56-bit table:
fffffffeefffffff
ffffffeeffffffff
(Note how the incorrect end address was cargo-cult-copied into the 'size' field of ~507 GB...)
The correct number is the 56-bit one, and both tables should show the following identical
layout:
ffffff8000000000 | -512 GB | fffffffeefffffff | 444 GB | ... unused hole
ffffffef00000000 | -68 GB | fffffffeffffffff | 64 GB | EFI region mapping space
Agreed?
Thanks,
Ingo
next prev parent reply other threads:[~2018-10-06 12:33 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-10-06 8:43 [PATCH 0/3] x86/mm/doc: Clean up mm.txt Baoquan He
2018-10-06 8:43 ` [PATCH 1/3] x86/KASLR: Update KERNEL_IMAGE_SIZE description Baoquan He
2018-10-06 13:06 ` [tip:x86/mm] " tip-bot for Baoquan He
2018-10-06 8:43 ` [PATCH 2/3] x86/mm/doc: Clean up the memory region layout descriptions Baoquan He
2018-10-06 13:07 ` [tip:x86/mm] x86/mm/doc: Clean up the x86-64 virtual memory " tip-bot for Baoquan He
2018-10-06 8:43 ` [PATCH 3/3] x86/doc/kaslr.txt: Create a separate part of document abourt KASLR at the end of file Baoquan He
2018-10-06 11:28 ` [PATCH 0/3] x86/mm/doc: Clean up mm.txt Baoquan He
2018-10-06 12:21 ` Ingo Molnar
2018-10-06 12:22 ` [PATCH 4/3] x86/mm/doc: Enhance the x86-64 virtual memory layout descriptions Ingo Molnar
2018-10-06 12:33 ` Ingo Molnar [this message]
2018-10-06 14:41 ` Baoquan He
2018-10-06 14:38 ` [PATCH 4/3 v2] " Ingo Molnar
2018-10-06 15:02 ` Baoquan He
2018-10-06 17:03 ` Ingo Molnar
2018-10-06 22:17 ` Andy Lutomirski
2018-10-09 0:35 ` Baoquan He
2018-10-09 4:48 ` Baoquan He
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