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| From: | Paolo Bonzini |
| Subject: | Re: [Qemu-devel] [PATCH v2 00/38] Delay destruction of memory regions to instance_finalize |
| Date: | Tue, 17 Sep 2013 19:16:15 +0200 |
| User-agent: | Mozilla/5.0 (X11; Linux x86_64; rv:17.0) Gecko/20130805 Thunderbird/17.0.8 |
Il 17/09/2013 19:07, Michael S. Tsirkin ha scritto: > After memory_region_del_subregion returns, > it's a promise that there will not be accesses > to the region. It's racy anyway. You can have memory_region_del_subregion happen one clock cycle after the other (physical) CPU has done checked that there will not be accesses to the region. A real bus has a "big PCI lock" (there can be only one transaction at a time), which is exactly what we want to get rid of. > So I'm not even sure we really need to move destroy to finalize anymore ... We definitely need to move it. Even if we added a flag that we set in memory_region_del_subregion, we need to check it later when AIO completes. Paolo
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