From e400c1ee47a5d4bf50c815349618464a29435c6d Mon Sep 17 00:00:00 2001 From: Charles Milette Date: Thu, 6 Feb 2020 08:54:48 -0500 Subject: [PATCH] Update notice about MBEC support This updates the document with findings from #3997, and makes the text clearer. --- ...-virtualization-based-protection-of-code-integrity.md | 9 +++------ 1 file changed, 3 insertions(+), 6 deletions(-) diff --git a/windows/security/threat-protection/device-guard/enable-virtualization-based-protection-of-code-integrity.md b/windows/security/threat-protection/device-guard/enable-virtualization-based-protection-of-code-integrity.md index 1edd7842a6..7619e56909 100644 --- a/windows/security/threat-protection/device-guard/enable-virtualization-based-protection-of-code-integrity.md +++ b/windows/security/threat-protection/device-guard/enable-virtualization-based-protection-of-code-integrity.md @@ -26,15 +26,12 @@ This can cause devices or software to malfunction and in rare cases may result i If this happens, see [Troubleshooting](#troubleshooting) for remediation steps. >[!NOTE] ->HVCI works with modern 7th gen CPUs or higher and its equivalent on AMD. CPU new feature is required *Mode based execution control (MBE) Virtualization*. AMD CPUs do not have MBE. - ->[!TIP] -> "The Secure Kernel relies on the Mode-Based Execution Control (MBEC) feature, if present in hardware, which enhances the SLAT with a user/kernel executable bit, or the hypervisor’s software emulation of this feature, called Restricted User Mode (RUM)." Mark Russinovich and Alex Ionescu. Windows Internals 7th Edition book +>Because it makes use of *Mode Based Execution Control*, HVCI works better with Intel Kaby Lake or AMD Zen 2 CPUs and newer. Processors without MBEC will rely on an emulation of this feature, called *Restricted User Mode*, which has a bigger impact on performance. ## HVCI Features -* HVCI protects modification of the Code Flow Guard (CFG) bitmap. -* HVCI also ensure your other Truslets, like Credential Guard have a valid certificate. +* HVCI protects modification of the Control Flow Guard (CFG) bitmap. +* HVCI also ensure your other Truslets, like Credential Guard, have a valid certificate. * Modern device drivers must also have an EV (Extended Validation) certificate and should support HVCI. ## How to turn on HVCI in Windows 10