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Re: [Qemu-devel] [PATCH v8 15/25] cputlb: introduce tlb_flush_* async wo

From: Richard Henderson
Subject: Re: [Qemu-devel] [PATCH v8 15/25] cputlb: introduce tlb_flush_* async work.
Date: Tue, 31 Jan 2017 12:04:29 -0800
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:45.0) Gecko/20100101 Thunderbird/45.6.0

On 01/27/2017 02:39 AM, Alex Bennée wrote:
From: KONRAD Frederic <address@hidden>

Some architectures allow to flush the tlb of other VCPUs. This is not a problem
when we have only one thread for all VCPUs but it definitely needs to be an
asynchronous work when we are in true multithreaded work.

We take the tb_lock() when doing this to avoid racing with other threads
which may be invalidating TB's at the same time. The alternative would
be to use proper atomic primitives to clear the tlb entries en-mass.

This patch doesn't do anything to protect other cputlb function being
called in MTTCG mode making cross vCPU changes.

Signed-off-by: KONRAD Frederic <address@hidden>
[AJB: remove need for g_malloc on defer, make check fixes, tb_lock]
Signed-off-by: Alex Bennée <address@hidden>

Reviewed-by: Richard Henderson <address@hidden>


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