Bug 524719
| Summary: | Xen hypervisor doesn't mask xsave feature from the guest; Fedora 11 PV domU kernel crashes | ||
|---|---|---|---|
| Product: | Red Hat Enterprise Linux 5 | Reporter: | Pasi Karkkainen <pasik> |
| Component: | xen | Assignee: | Xen Maintainance List <xen-maint> |
| Status: | CLOSED DUPLICATE | QA Contact: | Virtualization Bugs <virt-bugs> |
| Severity: | medium | Docs Contact: | |
| Priority: | low | ||
| Version: | 5.4 | CC: | clalance, xen-maint |
| Target Milestone: | rc | ||
| Target Release: | --- | ||
| Hardware: | All | ||
| OS: | Linux | ||
| Whiteboard: | |||
| Fixed In Version: | Doc Type: | Bug Fix | |
| Doc Text: | Story Points: | --- | |
| Clone Of: | Environment: | ||
| Last Closed: | 2009-11-06 17:56:35 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: | |||
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Description
Pasi Karkkainen
2009-09-21 21:04:47 UTC
Cool, thanks for the workaround in the domU kernel. Note that I have a patch pending for RHEL-5.5 to actually properly do the masking in the RHEL-5 dom0 kernel (https://bugzilla.redhat.com/show_bug.cgi?id=502826), so either way we should be fixed. Chris Lalancette Chris: do you need testing for that -164.el5virttest17 kernel? Another solution from Jeremy here: https://www.redhat.com/archives/fedora-xen/2009-September/msg00114.html But I guess RHEL5 Xen doesn't support custom cpuid masking per domU.. would be nice to be able to do that aswell :) (In reply to comment #2) > Chris: do you need testing for that -164.el5virttest17 kernel? Additional testing is welcome, especially since I haven't tested it specifically to mask out fxsave (although I did test it to properly mask out GBpages). > Another solution from Jeremy here: > https://www.redhat.com/archives/fedora-xen/2009-September/msg00114.html > > But I guess RHEL5 Xen doesn't support custom cpuid masking per domU.. would be > nice to be able to do that aswell :) Right. I'm not sure how invasive that is, given that RHEL-5 is getting a bit long in the tooth. Nevertheless, if you feel it is a worthwhile feature, open up a bug against the RHEL-5 xen package and we'll see what we can do. Chris Lalancette It looks like -164.el5virttest17 doesn't help. F11 GA kernel still crashes on the same way as earlier. (early) Initializing CPU#0 (early) invalid opcode: 0000 [#1] (early) SMP (early) Oh, yuck. I didn't port that part back. OK, I'll have to respin the patch for BZ 502826 with the NOXSAVE part backported. I'll keep you informed. Chris Lalancette Pasi,
OK, I've now uploaded a new RHEL-5 dom0 kernel that should properly mask xsave. You can get it from:
http://people.redhat.com/clalance/virttest
Please let me know if that works for you.
Thanks,
Chris Lalancette
Chris: -166.el5virttest18 fixed the problem! F11 GA PV domU boots/starts OK now. Thanks! (In reply to comment #7) > Chris: -166.el5virttest18 fixed the problem! F11 GA PV domU boots/starts OK > now. Excellent, thanks for the testing. Chris Lalancette Chris: I also opened a bug against rhel5 xen per your suggestion. https://bugzilla.redhat.com/show_bug.cgi?id=525873 Is this fix already included in the -170 kernel? Ah, I forgot all about this. I'm not 100% certain which kernel it went into, but it definitely went into the -172 kernel available here: http://people.redhat.com/dzickus/el5/ I'm actually going to close this as a dup since the fix for this went in along with the rest of the fixes for BZ 502826. Thanks, Chris Lalancette *** This bug has been marked as a duplicate of bug 502826 *** |