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Re: [Qemu-ppc] [PATCH] roms: Flush icache when writing roms to guest mem

From: Paolo Bonzini
Subject: Re: [Qemu-ppc] [PATCH] roms: Flush icache when writing roms to guest memory
Date: Sat, 14 Dec 2013 11:58:58 +0100
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:17.0) Gecko/20130923 Thunderbird/17.0.9

Il 13/12/2013 20:18, Scott Wood ha scritto:
>> Also are you sure flush_icache_range()
>> works correctly when multiple threads (multiple vCPUs,
>> potentially executing on different host CPUs) are involved?
> On PPC these cache operations broadcast, and are the architecturally
> defined way of doing self-modifying code.

I expect that to be the same on any cache-coherent system.

On a VIVT cache with shadow paging, some kernel collaboration may be
necessary because you have to flush using guest addresses rather than
host addresses (or alternatively you have to flush a whole context id).
 But we can fix the problem when it happens.


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