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From: | Jamie Lokier |
Subject: | Re: [Qemu-devel] Re: [PATCH][v2] Align file accesses with cache=off (O_DIRECT) |
Date: | Wed, 21 May 2008 17:24:06 +0100 |
User-agent: | Mutt/1.5.13 (2006-08-11) |
Anthony Liguori wrote: > Actually, this is precisely what I'd like to do. The key is to > mmap(MAP_PRIVATE) from the underling file directly into the guest's > memory. Should be just as applicable to QEMU as KVM (although for KVM > we need mmu-notifiers first). With QEMU, that would lead to a huge number of VMAs - different mmap address regions. Linux (or any host for all I know) doesn't handle that well. On Linux you could use remap_file_pages to avoid the VMA problem. -- Jamie
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