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Re: [Qemu-devel] [PATCH 00/10] linux-user: Speed up guest space initiali

From: Luke Shumaker
Subject: Re: [Qemu-devel] [PATCH 00/10] linux-user: Speed up guest space initialization on 32-bit ARM target
Date: Thu, 08 Feb 2018 21:29:26 -0500
User-agent: Wanderlust/2.15.9 (Almost Unreal) SEMI-EPG/1.14.7 (Harue) FLIM/1.14.9 (Goj┼Ź) APEL/10.8 EasyPG/1.0.0 Emacs/25.3 (x86_64-pc-linux-gnu) MULE/6.0 (HANACHIRUSATO)


On Thu, 28 Dec 2017 13:08:03 -0500,
Luke Shumaker wrote:
> From: Luke Shumaker <address@hidden>
> The goal of this patchset is to fix
> https://bugs.launchpad.net/qemu/+bug/1740219
> The gist is that the current linear search for an acceptable address
> range is a bad strategy when the reason we didn't get a good address
> on the first try is that we've having problems mapping the commpage
> for the 32-bit ARM target; especially if ASLR is disabled.
> I think that only the final patch in this patchset is actually
> necessary to fix the issue; but I didn't feel comfortable writing it
> without also makeing the preceding (small) changes.
> Luke Shumaker (10):
>   linux-user: Use #if to only call validate_guest_space for 32-bit ARM
>     target
>   linux-user: Rename validate_guest_space => init_guest_commpage
>   linux-user: init_guest_space: Clean up if we can't initialize the
>     commpage
>   linux-user: init_guest_space: Correctly handle guest_start in commpage
>     initialization
>   linux-user: init_guest_space: Clarify page alignment logic
>   linux-user: init_guest_commpage: Add a comment about size check
>   linux-user: init_guest_space: Clean up control flow a bit
>   linux-user: init_guest_space: Don't try to align if we'll reject it
>   linux-user: init_guest_space: Add a comment about search strategy
>   linux-user: init_guest_space: Try to make ARM space+commpage
>     continuous
>  linux-user/elfload.c | 145 
> ++++++++++++++++++++++++++++++++++++++++-----------
>  1 file changed, 114 insertions(+), 31 deletions(-)
> -- 
> 2.15.1
> Happy hacking,
> ~ Luke Shumaker

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