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<li class="day" id="2024-10-04">
<span class="title">04 October 2024 <span class="count">(2 messages)</span></span>
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<li class="message type-message" id="8049">
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<a class="id" href="#8049">#8049</a>
<span class="date">03:58 PM, 04 Oct 2024</span>
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We are celebrating today as we've reached 200,000 lines of code! A big thank you to all the friends and contributors who made this possible! 🤗
<br />
<br />https://github.com/HyperDbg/HyperDbg
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<a class="id" href="#8050">#8050</a>
<span class="date">03:58 PM, 04 Oct 2024</span>
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🎉
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<span class="title">05 October 2024 <span class="count">(1 messages)</span></span>
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<a class="id" href="#8051">#8051</a>
<span class="date">07:08 AM, 05 Oct 2024</span>
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Joined.
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<li class="day" id="2024-10-06">
<span class="title">06 October 2024 <span class="count">(20 messages)</span></span>
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<a class="id" href="#8052">#8052</a>
<span class="tags">b</span>
<span class="tags">o</span>
<span class="tags">t</span>
<span class="date">08:38 AM, 06 Oct 2024</span>
</div>
<div class="text">
[discord] <ohault> Could a tiny hypervisor emulate PopCnt and SSE4.2 on top of a legacy CPU without these instructions ?
</div>
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<li class="message type-message" id="8053">
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@HughEverett
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<a class="reply" href="2024-10.html#8052">↶ Reply to #8052</a>
<a class="id" href="#8053">#8053</a>
<span class="date">10:12 AM, 06 Oct 2024</span>
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<div class="text">
Why not using QEMU?
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@yxxyz
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<a class="reply" href="2024-09.html#8036">↶ Reply to #8036</a>
<a class="id" href="#8054">#8054</a>
<span class="date">10:15 AM, 06 Oct 2024</span>
</div>
<div class="text">
can u reproduce it? it works if we set the segment selector. I have sent a pr to dev.
</div>
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<li class="message type-message" id="8055">
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@HyperDbgBot
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<a class="id" href="#8055">#8055</a>
<span class="tags">b</span>
<span class="tags">o</span>
<span class="tags">t</span>
<span class="date">10:18 AM, 06 Oct 2024</span>
</div>
<div class="text">
[discord] <ohault> [reply]: The idea behind « tiny » would be a very slim and transparent layer at boot time as Type1 hypervisor to just add to your existing hardware some additional capabilities emulated
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@honorary_bot
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<a class="reply" href="2024-10.html#8055">↶ Reply to #8055</a>
<a class="id" href="#8056">#8056</a>
<span class="date">10:21 AM, 06 Oct 2024</span>
</div>
<div class="text">
How old is the target CPU? What model is it?
</div>
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@HyperDbgBot
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<a class="id" href="#8057">#8057</a>
<span class="tags">b</span>
<span class="tags">o</span>
<span class="tags">t</span>
<span class="date">10:23 AM, 06 Oct 2024</span>
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[discord] <ohault> [reply]: I can think of earlier generations of Intel i7, but this concept could also add some system ram to the host from some fast local NVMEs (Western Digital had a product in the past leveraging this concept)
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<a class="id" href="#8058">#8058</a>
<span class="date">10:31 AM, 06 Oct 2024</span>
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While it would be possible to create a hypervisor, pre-popcnt CPUs have the old VTx (pre-EPT). You would need to trap #UD and emulate the needed instruction. But I'm afraid you'll be disappointed by the performance of this method, it will be very slow. The better idea would be to instrument target binaries directly.
<br />As for the RAM from NVME - I'm afraid it doesn't work this way, maximum you can can get is a an analog of a page file, which is already implemented in the OS. DRAM traffic can not be magically turned into PCIe traffic, and also it's has a completely different inner workings.
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<a class="id" href="#8059">#8059</a>
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<span class="date">10:36 AM, 06 Oct 2024</span>
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[discord] <ohault> [reply]: About CPU extensions, VT would be a required. About RAM extensions, I guess it is this very special product - <a href="https://www.westerndigital.com/en-ap/products/internal-drives/data-center-drives/ultrastar-dc-me200-nvme-ssd?sku=0TS1741" rel="noopener">https://www.westerndigital.com/en-ap/products/internal-drives/data-center-drives/ultrastar-dc-me200-nvme-ssd?sku=0TS1741</a> and I guess a special type 1 hypervisor should be used somewhere ?
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<a href="https://www.westerndigital.com/en-ap/products/internal-drives/data-center-drives/ultrastar-dc-me200-nvme-ssd?sku=0TS1741" rel="noreferer nopener nofollow">1TiB U.2 Ultrastar® DC ME200 Memory Drive | Western Digital</a>
<p>The digital economy has created significant demands for both real-time and batch processing of large data sets. IT organizations across the world are leveraging in-memory computing to drive superior application performance and obtain meaningful insights through the use of advanced business analytics.</p>
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<a class="id" href="#8060">#8060</a>
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<span class="date">10:42 AM, 06 Oct 2024</span>
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[discord] <ohault> [reply]: Very very interesting - <a href="https://documents.westerndigital.com/content/dam/doc-library/en_us/assets/public/western-digital/product/data-center-drives/ultrastar-dc-me200/product-manual-ultrastar-dc-me200.pdf" rel="noopener">https://documents.westerndigital.com/content/dam/doc-library/en_us/assets/public/western-digital/product/data-center-drives/ultrastar-dc-me200/product-manual-ultrastar-dc-me200.pdf</a>
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<a class="id" href="#8061">#8061</a>
<span class="date">10:44 AM, 06 Oct 2024</span>
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This product doesn't mention it is a RAM replacement, it is still a storage device with "near DRAM speeds". So they use a hypervisor for memory "bubbling". Don't expect this method to be any near DRAM-like performance.
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<a class="id" href="#8062">#8062</a>
<span class="date">10:45 AM, 06 Oct 2024</span>
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Theres only one technology with flash memory that works as RAM - Intel Optane DC
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<a class="id" href="#8063">#8063</a>
<span class="date">10:45 AM, 06 Oct 2024</span>
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And it was designed to be a DRAM controller with optane memory on dram sticks. Even then, optane is a cache for RAM.
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