Hyper-V HyperClear Mitigation for L1 Terminal Fault

Introduction A new speculative execution side channel vulnerability was announced recently that affects a range of Intel Core and Intel Xeon processors. This vulnerability, referred to as L1 Terminal Fault (L1TF) and assigned CVE 2018-3646 for hypervisors, can be used for a range of attacks across isolation boundaries, including intra-OS attacks from user-mode to kernel-mode… Read more

Hyper-V symbols for debugging

Having access to debugging symbols can be very handy, for example when you are A partner building solutions leveraging Hyper-V, Trying to debug a specific issue, or Searching for bugs to participate in the Microsoft Hyper-V Bounty Program. Starting with symbols for Windows Server 2016 with an installed April 2018 cumulative update, we are now… Read more

Looking at the Hyper-V Event Log (January 2018 edition)

Hyper-V has changed over the last few years and so has our event log structure. With that in mind, here is an update of Ben’s original post in 2009 (“Looking at the Hyper-V Event Log”). This post gives a short overview on the different Windows event log channels that Hyper-V uses. It can be used… Read more

Migrating local VM owner certificates for VMs with vTPM

Whenever I want to replace or reinstall a system which is used to run virtual machines with a virtual trusted platform module (vTPM), I’ve been facing a challenge: For hosts that are not part of a guarded fabric, the new system does need to be authorized to run the VM. Some time ago, I wrote… Read more

What’s new in Hyper-V for Windows 10 Fall Creators Update?

Windows 10 Fall Creators Update has arrived!  While we’ve been blogging about new features as they appear in Windows Insider builds, many of you have asked for a consolidated list of Hyper-V updates and improvements since Creators Update in April. Summary: Quick Create includes a gallery (and you can add your own images) Hyper-V has… Read more

Hyper-V virtual machine gallery and networking improvements

In January, we added Quick Create to Hyper-V manager in Windows 10.  Quick Create is a single-page wizard for fast, easy, virtual machine creation. Starting in the latest fast-track Windows Insider builds (16237+) we’re expanding on that idea in two ways.  Quick Create now includes: A virtual machine gallery with downloadable, pre-configured, virtual machines. A… Read more

Copying Files into a Hyper-V VM with Vagrant

A couple of weeks ago, I published a blog with tips and tricks for getting started with Vagrant on Hyper-V. My fifth tip was to “Enable Nifty Hyper-V Features,” where I briefly mentioned stuff like differencing disks and virtualization extensions. While those are useful, I realized later that I should have added one more feature… Read more

Vagrant and Hyper-V — Tips and Tricks

Learning to Use Vagrant on Windows 10 A few months ago, I went to DockerCon as a Microsoft representative. While I was there, I had the chance to ask developers about their favorite tools. The most common tool mentioned (outside of Docker itself) was Vagrant. This was interesting — I was familiar with Vagrant, but… Read more

Making it easier to revert

Sometimes when things go wrong in my environment, I don’t want to have to clean it all up — I just want to go back in time to when everything was working. But remembering to maintain good recovery points isn’t easy. Now we’re making it so that you can always roll back your virtual machine to a recent good state if you… Read more

What’s new in Hyper-V for the Windows 10 Creators Update?

Microsoft just released the Windows 10 Creators Update.  Which means Hyper-V improvements! New and improved features in Creators Update: Quick Create Checkpoint and Save for nested Hyper-V Dynamic resize for VM Connect Zoom for VM Connect Networking improvements (NAT) Developer-centric memory management Keep reading for more details.  Also, if you want to try new Hyper-V… Read more