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[Qemu-devel] 4G address space remapping on 64-bit host

From: Blue Swirl
Subject: [Qemu-devel] 4G address space remapping on 64-bit host
Date: Fri, 29 Jun 2007 12:41:53 +0300


I had an idea of mapping the full 32-bit target virtual address space
to a 4GB area on 64-bit hosts. Then the loads and stores to normal RAM
(except page tables, code_mem_write etc) could be made much faster,
falling back to softmmu for other pages. The idea has come up before,
for example in this Fabrice's message:

But I'm not sure if this would be worth the effort, the speedup would
depend on the frequency of the loads/stores and also translation time
vs. translated code execution times. Does anyone have good statistics
on those?

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