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Re: [Qemu-devel] [PATCH] notdirty_mem_write: implement 8-byte accesses
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From: |
Richard Henderson |
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Subject: |
Re: [Qemu-devel] [PATCH] notdirty_mem_write: implement 8-byte accesses |
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Date: |
Fri, 13 Oct 2017 13:04:22 -0700 |
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User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.3.0 |
On 10/13/2017 11:19 AM, Andrew Baumann wrote:
> Aligned 8-byte memory writes by a 64-bit target on a 64-bit host should
> always turn into atomic 8-byte writes on the host, however if we missed
> in the softmmu, and the TLB line was marked as not dirty, then we
> would end up tearing the 8-byte write into two 4-byte writes in
> access_with_adjusted_size().
>
> Signed-off-by: Andrew Baumann <address@hidden>
> ---
> This manifested as a race in lock-free synchronisation with an aarch64
> Windows guest on an x86-64 host (with multithreaded TCG).
Reviewed-by: Richard Henderson <address@hidden>
r~