Bug 1651556
Summary: | [DDF] If CPU don't have support hardware virtualization, RHEL KVM will not run. But virt-host-validate just warn as | ||
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Product: | Red Hat Enterprise Linux 8 | Reporter: | Direct Docs Feedback <ddf-bot> |
Component: | Documentation | Assignee: | Jiri Herrmann <jherrman> |
Documentation sub component: | DDF | QA Contact: | RHEL DPM <rhel-docs> |
Status: | CLOSED CURRENTRELEASE | Docs Contact: | |
Severity: | unspecified | ||
Priority: | unspecified | CC: | jdenemar, jsuchane, kmoriwak, rhel-docs |
Version: | 8.0 | ||
Target Milestone: | rc | ||
Target Release: | 8.0 | ||
Hardware: | All | ||
OS: | All | ||
Whiteboard: | |||
Fixed In Version: | Doc Type: | If docs needed, set a value | |
Doc Text: | Story Points: | --- | |
Clone Of: | Environment: | ||
Last Closed: | 2018-11-23 17:22:39 UTC | Type: | --- |
Regression: | --- | Mount Type: | --- |
Documentation: | --- | CRM: | |
Verified Versions: | Category: | --- | |
oVirt Team: | --- | RHEL 7.3 requirements from Atomic Host: | |
Cloudforms Team: | --- | Target Upstream Version: | |
Embargoed: |
Description
Direct Docs Feedback
2018-11-20 10:38:23 UTC
I think if virt-host-validate shows "Check firmware settings to enable VT-x/AMD-V", it will be good. (In reply to Kazuo Moriwaka from comment #1) > I think if virt-host-validate shows "Check firmware settings to enable > VT-x/AMD-V", it will be good. I guess the virt-host-validate does not have downstream hacks, so if there is missing VT-X/AMD-V cpu feature it just warns about it even though QEMU's TCG mode should not be supported in RHEL. Jirka, any idea? That's correct, virt-host-validate does not contain any downstream hacks. However, the bug description is not correct. While KVM will not be usable, one can still create QEMU virtual machines using TCG (domain type "qemu" in libvirt vs. "kvm"). And in that case, performance will indeed be significantly limited. I believe such usage is also officially unsupported, but I don't really see anything wrong with what virt-host-validate says. I agree with virt-host-validate's message is not wrong as general purpose diagnose message. I suggest adding a note or sentence after procedure 3 to complement virt-host-validate's message. Such as "To avoid unpractical low performance, RHEL QEMU will fail to start if CPU's hardware virtualization support is missing." There isn't a clear statement about the requirements of CPU's HVM support in this document. It's not a problem (all recent CPU has HVM support), but adding this note would decrease # of support cases from nested virtualization users. Thanks, It's very clear description and I'm OK with this fix. Thank you, |