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Re: [Qemu-devel] [RFC v2 04/11] tcg: comment on which functions have to
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From: |
Paolo Bonzini |
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Subject: |
Re: [Qemu-devel] [RFC v2 04/11] tcg: comment on which functions have to be called with tb_lock held |
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Date: |
Wed, 11 May 2016 14:58:18 +0200 |
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User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:38.0) Gecko/20100101 Thunderbird/38.7.1 |
On 06/05/2016 20:22, Sergey Fedorov wrote:
> However, there's no sensible description of what is protected by tb_lock
> and mmap_lock. I think we need to have a clear documented description of
> the TCG locking scheme in order to be sure we do right things in MTTCG.
I think there was such a patch somewhere, but: tb_lock basically
protects tcg_ctx, while mmap_lock protects the user-mode emulation page
table (the equivalent for system emulation is the memory map which is
protected by the BQL). Furthermore, mmap_lock must be taken outside
tb_lock.
Paolo