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marcan42's profile
Hector Martin
Hector Martin
Hector Martin
@marcan42

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Hector Martin

@marcan42

If it ain't broke, I'll fix it! I'm porting Linux to Apple Silicon Macs at @AsahiLinux. http://patreon.com/marcan  | http://github.com/sponsors/marcan 

Tokyo, Japan
marcan.st
Joined May 2009

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    1. Hector Martin‏ @marcan42 26 Feb 2019
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      Thunderclap TL;DR: someone finally tried on PCs (over Thunderbolt) what we did on the PS4 (over PCIe) years ago. As I said at the time, IOMMUs are useless if the drivers are not written assuming the device is evil. *Nobody* writes PCIe drivers assuming the device is evil.

      14 replies 188 retweets 444 likes
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    2. Colin Rothwell‏ @colinrothwell 27 Feb 2019
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      Replying to @marcan42

      This is a fair summary of our work - in our defense, we also did this years ago (first attacks in late 2016), but the academic review cycle can be a pain :) Also, widespread Thunderbolt 3 makes it particularly timely again

      1 reply 1 retweet 3 likes
    3. Hector Martin‏ @marcan42 27 Feb 2019
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      Replying to @colinrothwell

      We did ours in January 2015 :-). But yeah, I'm happy this is happening now. As usual, people need to realize just how broken the status quo is.

      1 reply 0 retweets 1 like
    4. Hector Martin‏ @marcan42 27 Feb 2019
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      Replying to @marcan42 @colinrothwell

      Also I expect the platform/cost to go down dramatically this year; Lattice ECP5 is pretty much the next big open source FPGA target and there's already a PCIe implementation in the works (that isn't hacked Lattice code like we used in 2015):https://github.com/whitequark/Yumewatari …

      1 reply 3 retweets 7 likes
    5. Colin Rothwell‏ @colinrothwell 27 Feb 2019
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      Replying to @marcan42

      Exciting / terrifying

      1 reply 0 retweets 1 like
      Hector Martin‏ @marcan42 27 Feb 2019
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      Replying to @colinrothwell

      BTW, do you have more info on what platforms support ATS? We looked at that at the time and our conclusion was that nothing but big servers (where physical access isn't really a thing) supported it.

      8:26 AM - 27 Feb 2019
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      • Hacker Fantastic 📡
      1 reply 0 retweets 1 like
        1. New conversation
        1. Colin Rothwell‏ @colinrothwell 27 Feb 2019
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          Replying to @marcan42

          At the time this is what we found - more recently we think we've seen it on e,g. a Dell XPS 15. Think Intel are moving away from market segmentation in that way. Also the case that you can rent a server with an FPGA in it now...

          1 reply 0 retweets 1 like
        2. Hector Martin‏ @marcan42 27 Feb 2019
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          Replying to @colinrothwell

          Good point about servers and FPGAs, ha. I think I read about that recently and figured that couldn't possibly end well if they're trying to virtualize/IOMMU it...

          0 replies 0 retweets 2 likes
          3. End of conversation

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