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Re: [Qemu-devel] [RFC v3 16/19] tcg: move locking for tb_invalidate_phys

From: Sergey Fedorov
Subject: Re: [Qemu-devel] [RFC v3 16/19] tcg: move locking for tb_invalidate_phys_page_range up
Date: Tue, 28 Jun 2016 22:43:08 +0300
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:38.0) Gecko/20100101 Thunderbird/38.8.0

On 03/06/16 23:40, Alex Bennée wrote:
> While we previously assumed an existing memory lock protected the page
> look up in the MTTCG SoftMMU case the memory lock is provided by the
> tb_lock. As a result we push the taking of this lock up the call tree.
> This requires a slightly different entry for the SoftMMU and user-mode
> cases from tb_invalidate_phys_range.

Sorry, I can't understand the description for the patch :( Some
rewording might be helpful, if you don't mind.


> This also means user-mode breakpoint insertion needs to take two locks
> but it hadn't taken any previously so this is an improvement.
> Signed-off-by: Alex Bennée <address@hidden>
> ---
>  exec.c          | 16 ++++++++++++++++
>  translate-all.c | 37 +++++++++++++++++++++++++++++--------
>  2 files changed, 45 insertions(+), 8 deletions(-)

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