Re: [Qemu-devel] [PATCH] roms: Flush icache when writing roms to guest memory

[Paolo Bonzini]

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.

Paolo