Hyper-V in environments throwing error

[crutkas]

Dev Home version

0.1501.547.0

Windows build number

10.0.22631.3874

Other software

OS Build Version: 10.0.22631.3874.amd64fre.ni_release.220506-1250
.NET Version: .NET 8.0.6

Steps to reproduce the bug

1. Updated Dev Home to latest
2. Click environment
3. Get hyper-v error

Expected result

Just works cause Hyper-V Manager just works.

Actual result

hyper-v manager works yet dev home doesn't

Included System Information

CPU: Intel(R) Core(TM) Ultra 7 165H
Physical Memory: 31.64GB (12.65GB free)
Processor Architecture: x64

Included Extensions Information

Extensions:
Microsoft.Windows.DevHomeGitHubExtension.Canary_0.1500.530.0_x64__8wekyb3d8bbwe (Dev Home GitHub Extension (Canary))
Microsoft.Windows.DevHomeAzureExtension.Canary_0.1000.530.0_x64__8wekyb3d8bbwe (Dev Home Azure Extension (Canary))
Microsoft.Windows.DevHome_0.1501.533.0_x64__8wekyb3d8bbwe (Core Widget Extension)
Microsoft.Windows.DevHome_0.1501.533.0_x64__8wekyb3d8bbwe (Hyper-V Extension)
Microsoft.Windows.DevHomeGitHubExtension_0.1500.533.0_x64__8wekyb3d8bbwe (Dev Home GitHub Extension (Preview))
Microsoft.Windows.DevHome.Canary_0.1501.547.0_x64__8wekyb3d8bbwe (Core Widget Extension)
Microsoft.Windows.DevHome.Canary_0.1501.547.0_x64__8wekyb3d8bbwe (Hyper-V Extension)

Widget Service:
MicrosoftWindows.Client.WebExperience_524.18000.0.0_x64__cw5n1h2txyewy

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[bbonaby]

Hey @crutkas, Which error are you talking about exactly? If you mean the request to add the user to the Hyper-v group: I explain why its needed here: #2995 (comment)

[crutkas]

Sorry looks like the screenshot didn’t paste in.

This is adding user to hyper-v group

If hyperv manager lets me create / launch / delete without this, dev home should too

[bbonaby]

We can talk offline about it but we actually can't as the Hyper-V extension would need to run elevated in order to do that. The comment I linked above explains it. But under the hood Hyper-V manager is elevating (without a UAC prompt), by means we can't use in Dev Home. The only other way to allow users to interact with Hyper-V is if they are in the Hyper-V admin group. Once added to this group the users would need to log off/on again or reboot. It's a local users and groups account which is a bit of a special case, as even after being added/removed from the group the users access token that was given to them at logon, does not get updated. The Hyper-v apis are checking the users access token to confirm if they're in the group, which is why we can't just add them and have it all just work as they still won't be able to see/interact with their VMs until they've logged off/rebooted unfortunately:

Heres an excerp from a MS learn doc: How Access Tokens Work | Microsoft Learn which states

If you add a user to a group after the user’s access token has been issued, or modify privileges assigned to the user account, the user must log off and then log on again before the access token will be updated.