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Merge pull request #8132 from aktsuda/patch-2

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Update kernel-dma-protection-for-thunderbolt.md
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Daniel Simpson 2020-08-26 12:16:41 -07:00 committed by GitHub
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windows/security/information-protection/kernel-dma-protection-for-thunderbolt.md
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@ -84,11 +84,15 @@ Beginning with Windows 10 version 1809, you can use Security Center to check if
1. Launch MSINFO32.exe in a command prompt, or in the Windows search bar.
2. Check the value of **Kernel DMA Protection**.
![Kernel DMA protection in System Information](bitlocker/images/kernel-dma-protection.png)
3. If the current state of **Kernel DMA Protection** is OFF and **Virtualization Technology in Firmware** is NO:
3. If the current state of **Kernel DMA Protection** is OFF and **Hyper-V - Virtualization Enabled in Firmware** is NO:
- Reboot into BIOS settings
- Turn on Intel Virtualization Technology.
- Turn on Intel Virtualization Technology for I/O (VT-d). In Windows 10 version 1803, only Intel VT-d is supported. Other platforms can use DMA attack mitigations described in [BitLocker countermeasures](bitlocker/bitlocker-countermeasures.md).
- Reboot system into Windows 10.
>[!NOTE]
> **Hyper-V - Virtualization Enabled in Firmware** is NOT shown when **A hypervisor has been detected. Features required for Hyper-V will not be displayed.** is shown because this means that **Hyper-V - Virtualization Enabled in Firmware** is YES.
4. If the state of **Kernel DMA Protection** remains Off, then the system does not support this feature.
For systems that do not support Kernel DMA Protection, please refer to the [BitLocker countermeasures](bitlocker/bitlocker-countermeasures.md) or [Thunderbolt™ 3 and Security on Microsoft Windows® 10 Operating system](https://thunderbolttechnology.net/security/Thunderbolt%203%20and%20Security.pdf) for other means of DMA protection.