31 Oct '17, 11am

10 Year Old Bug Crushed By Hacker on a Mission

PCI pass through is the ability of a virtualized guest system to directly access PCI hardware. Pass through for dedicated GPUs has just recently been added to the Linux kernel-based virtual machine. Soon afterward, users began to find that switching on nested page tables (NPT), a technology intended to provide hardware acceleration for virtual machines, had the opposite effect on AMD platforms and slowed frame rate down to a crawl. Annoyed by this [gnif] set out to to fix the problem . His first step was to run graphics benchmarks to isolate the source of the problem. Having identified the culprit in the GPU, [gnif] began to read up on the involved technology stack. Three days of wrapping his head around technical docs allowed [gnif] to find the single line of code that resulted in a faulty memory set up and to implement a basic fix. He then passed the work on to [Paolo Bo...

Full article: https://hackaday.com/2017/10/31/10-year-old-bug-crushed-b...

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