Muli Ben-Yehuda's journal

Calgary is now running with translation enabled in the lab on our x366 servers. We’ve been working on this for a while now, bug after bug, but yesterday I had a fit of inspiration, fixed the last one, and now it boots all the way to userspace, with SAS, NICs and USB all DMA’ing fine(!!!). The last bug was particularly stupid – we were writing a 64 bit quantity into the 64 bit TCE Table Address register – with a 32 bit call (writel instead of writeq). Argh!

I’ll detail the more interesting bugs we had for All Code Sucks, eventually. At the moment Calgary is running with static mappings (the identity translation – TCE ‘x’ maps physical address ‘x’, and all physical addresses have corresponding TCEs), and the next step is dynamic mappings. Which I’ve worked on until 2 AM last night. It doesn’t work yet. But it will. Real Soon Now 🙂

Date: Wed, 15 Feb 2006 17:14:27 -0600 (CST)
From: papers@linuxsymposium.org
To: mulix@mulix.org
Subject: Proposal Utilizing IOMMUs for Virtualization in Linux and Xen

Your paper proposal Utilizing IOMMUs for Virtualization in Linux and Xen
has been accepted by the 2006 Linux Symposium Committee.