High VM-EXIT and Host CPU usage on idle with Windows Server 2025

[Upstairs_Cycle384]

According to the readme [0], stable should kinda match the most recent Red Hat Enterprise Linux release. Seems like November was the last one!?

On Fedora People, the last release was from November 2025.

On Rocky Linux, the last release was from March 24th 2026.

The `release-drivers-versions.txt` in the Rocky Linux RPM outlines the various versions of the drivers shipped in their version of the ISO.

I skimmed through it. The latest is driver build is 0.1.297 on Rocky Linux. This is newer than 0.1.285 on Fedora People. Additionally, the tools are newer -- The qemu guest agent for Windows is from Feb 19th 2026.

 

[Upstairs_Cycle384]

I narrowed it down to this new property (8):
AvailableSecurityProperties: 1,2,4,5,7,8
"8, If present, APIC virtualization is available."
see: Enable virtualization-based protection of code integrity

I'm not sure how you guys got APIC virtualization enabled. on my EPYC Milan, I only have 1, 2, 5, and 7. Is anyone seeing 8 on Zen3 or above or is that just showing up for Intel users?

I've been trying to trigger APIC virtualization so I can generate a BSOD dump on my end. I've been trying a bunch of stuff between settings in the bios, kvm_amd parameters, and vm conf file changes.

My motherboard is a bit unique in that I do have AVIC forced enabled "force_avic=Y" if that's somehow a factor in preventing APIC virtualization from showing up on the guest