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From: | Paul Brook |
Subject: | Re: [Qemu-devel] Re: [RFC PATCH 4/7] ide: IOMMU support |
Date: | Thu, 15 Jul 2010 11:33:14 +0100 |
User-agent: | KMail/1.13.3 (Linux/2.6.33-2-amd64; KDE/4.4.4; x86_64; ; ) |
> > Depending how the we decide to handle IOMMU invalidation, it may also be > > necessary to augment the memory_map API to allow the system to request a > > mapping be revoked. However this issue is not specific to the IOMMU > > implementation. Such bugs are already present on any system that allows > > dynamic reconfiguration of the address space, e.g. by changing PCI BARs. > > That's why the memory_map API today does not allow mappings to persist > after trips back to the main loop. Sure it does. If you can't combine zero-copy memory access with asynchronous IO then IMO it's fairly useless. See e.g. dma-helpers.c Paul
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