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Re: [Qemu-devel] best way to implement a "memclear" type instruction in
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From: |
Xin Tong |
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Subject: |
Re: [Qemu-devel] best way to implement a "memclear" type instruction in TCG? |
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Date: |
Wed, 22 Jan 2014 13:24:06 -0600 |
would there be any memory ordering issue ? what if the host processor
has a more relaxed memory ordering then the guest. maybe memset with
membarriers in between.
Xin
On Wed, Jan 22, 2014 at 1:06 PM, Richard Henderson <address@hidden> wrote:
> On 01/22/2014 10:58 AM, Peter Maydell wrote:
>> In theory we could just find the pointer to the memory QEMU is backing
>> the guest RAM with and call memset on it...
>
> That's more or less what we do for the s390 insn XC.
> See mem_helper.c, especially mvc_fast_memset.
>
>
> r~
>