Imported VM Starts but Does Not Initialize the Display

Mefosheez

@stormi @kagbasi-ngc I have this same error in a separate thread, however, there is no nesting involved. from my limited knowledge, it seems like xcp is not seeing the available memory resources during boot and fails. if I migrate a running VM to the same host that gives me this error, it will operate as expected. but, after reboot... failure to launch.

https://xcp-ng.org/forum/topic/10083/uefi-guests-not-loading-console?_=1734014269146

@olivierlambert Thanks for your help so far.

stormi

@kagbasi-ngc Looks like we missed something, as the log indicates it loaded OVMF-release.fd:

Dec 13 13:54:59 VMH01 xenguest-2-build[8345]: Loaded OVMF from /usr/share/edk2/OVMF-release.fd

We'll come back to you with a better test procedure.

For now I just have a quick and dirty one, consisting in overwriting the release file with the debug one:

cp /usr/share/edk2/OVMF-debug.fd /usr/share/edk2/OVMF-release.fd

You can revert this change with yum reinstall edk2.

kagbasi-ngc

@stormi Sorry for the delayed reply. I did as you requested, and below are the resulting log files. I started the VM at timestamp Dec 17 14:43:34 and stopped it about 2 minutes later.

If I can be of assistance, don't hesitate to ask please. Thank you.

stormi

@kagbasi-ngc @Mefosheez We're trying to find developer time to diagnose the cause, but it's not the best time of the year, so I can't promise anything on delays.

stormi

@kagbasi-ngc Does your VM have a vTPM? If so, could you try without?

kagbasi-ngc

@stormi No worries at all, I understand.

kagbasi-ngc

@stormi Yes it does. I just deleted the VTPM and tried starting it, but no success. Still the same issue - can't initialize the display.

I also disabled Secure Boot, and got the same results.

Mefosheez

@stormi thanks for the feedback. no rush here. just let me know if I can help.

Mefosheez

@stormi I wanted to follow up. I saw a good number of patches available today, first updates since the issues started for me. I processed them, but this issue still seems persist.

I know this thread is about nested virt, and i don't want to derail that. this is where i had posted about the issue prior. I believe they are going to be tided to the same root. any help would be appreciated.

https://xcp-ng.org/forum/topic/10083/uefi-guests-not-loading-console?_=1734014269146

stormi

@Mefosheez I forwarded internally. Feel free to ask again after a week if no answer comes.

Mefosheez

@stormi I marked it as a question about a week ago now. do you suggest making a new post as a question all together?

stormi

@Mefosheez Marking a new post as a question will not be necessary. @anthonyper is the one working on what we think is the issue (a regression on the EDK2 package). I haven't heard of a fix yet, but it's in progress.

Mefosheez

@stormi thank you for the update. and @anthonyper for taking a look.

anthonyper

Hi @kagbasi-ngc, I believe I've got a fix for your current issue, do you want to give it a try? @Mefosheez it's probably going to work for you as well.

I've prepared an update, could you install it?

# Download repo file for XCP-ng 8.3
wget https://koji.xcp-ng.org/repos/user/8/8.3/xcpng-users.repo -O /etc/yum.repos.d/xcpng-users.repo

# Update edk2
yum update --enablerepo=xcp-ng-aperard1 edk2

Alternatively, the RPM is there: https://koji.xcp-ng.org/repos/user/8/8.3/aperard1/x86_64/Packages/edk2-20220801-1.7.7.1.0.enomemfix.1.xcpng8.3.x86_64.rpm

And if you are curious about the change, it's explained in there https://github.com/xcp-ng-rpms/edk2/pull/4

Cheers,

tperard opened this pull request in xcp-ng-rpms/edk2

closed OvmfPkg/XenPlatformPei: Allocate more memory when PEI FV is shadowed #4

Mefosheez

@anthonyper said in Imported VM Starts but Does Not Initialize the Display:

yum update --enablerepo=xcp-ng-aperard1 edk2

confirmed with ubunutu desktop 24.02 in uefi. i can confirm windows later today but this looks to be the fix. will this be folded into an upcoming release?

Andrew

@Mefosheez Does your host not have large HAP size?

Please show the output from xl dmesg | grep HAP on your XCP host.

Mefosheez

@Andrew

[08:30 xcp-r630 ~]# xl dmesg | grep HAP
(XEN) [ 2.581645] HVM: Hardware Assisted Paging (HAP) detected
(XEN) [ 2.584428] HVM: HAP page sizes: 4kB, 2MB, 1GB

This is not something I have ever adjusted or set prior.

Andrew

@Mefosheez @anthonyper If it solves the problem, then great!

You can't set or change HAP, it's what the CPU chip supports. I was looking at the notes for the change and part of it is related to hosts that have small HAP sizes (ie, 4K, 2M, not 1G). As there are other updates in the same version the issues must have been fixed by a different part of the patch.

kagbasi-ngc

@anthonyper said in Imported VM Starts but Does Not Initialize the Display:

yum update --enablerepo=xcp-ng-aperard1 edk2

YES - you fixed it! Thank you!!!
I tried the package and it worked - the VM started and was able to initialize the display and finish booting up. Glad you found the issue and I'm even more glad that it was my report that prompted you to look into this. This is a true testament to the power of this community.

olivierlambert

@anthonyper so your fix is working Going in a next train of updates then