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readme: link to gem5 spectre meltdown poc

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Ciro Santilli
2018-04-12 11:20:58 +01:00
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README.adoc
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@@ -2526,9 +2526,11 @@ Like QEMU, gem5 also has a syscall emulation mode (SE), but in this tutorial we
* advantages of gem5:
** simulates a generic more realistic pipelined and optionally out of order CPU cycle by cycle, including a realistic DRAM memory access model with latencies, caches and page table manipulations. This allows us to:
*** do much more realistic performance benchmarking with it, which makes absolutely no sense in QEMU, which is purely functional
*** make certain functional cache observations that are not possible in QEMU, e.g.:
**** use Linux kernel APIs that flush memory like DMA, which are crucial for driver development. In QEMU, the driver would still work even if we forget to flush caches.
**** TODO spectre / meltdown
*** make certain functional observations that are not possible in QEMU, e.g.:
**** use Linux kernel APIs that flush cache memory like DMA, which are crucial for driver development. In QEMU, the driver would still work even if we forget to flush caches.
**** spectre / meltdown:
***** https://www.mail-archive.com/gem5-users@gem5.org/msg15319.html
***** https://github.com/jlpresearch/gem5/tree/spectre-test
+
It is not of course truly cycle accurate, as that
** would require exposing proprietary information of the CPU designs: link:https://stackoverflow.com/questions/17454955/can-you-check-performance-of-a-program-running-with-qemu-simulator/33580850#33580850[]