BUG - running new version on nested virtualization

[KAĞAN IŞILDAK <kagan.isildak@xxxxxxxxxxxxx>]

Hey there

I'm facing weird issue. At my lab env. i'm building xen 4.18 and make deb package than i use it on virtual machine which running on esxi with CPU features for nested virtualization and there's no problem. (I can create vm and able to do all operational things etc.)

Last week i tried to migrate 4.19 and 4.20 but Xen get stuck on booting and at debug log i just see error about mounting /proc/xen (mount: /proc/xen: mount point does not exist.) I've no f... idea why it caused. (At my all tries, i used fresh install of ubuntu server 22.04, 24.04)

Is there any one faced issue and is there special things to do in build phase for nested virtualization? (I didn't change anything while building 4.18, i'm just using stable branch) 

Regards

Kağan