[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-devel] XenServer Xen-4.5 (-rc3ish) testing
Hi, Over the weekend, XenServer testing managed to run a side-by-side test of XenServer trunk and XenServer experimental xen-4.5. These are identical other than the version of Xen (and associated libraries) in use, i.e. identical dom0 kernel, Xapi toolstack and dom0 userspace, other than as linked against newer Xen libraries. The Xen-4.5 tests were on top of c/s e6c3d371d4 "systemd: use pkg-config to determine systemd library availability" There are a few notable issues exposed: XEN_DOMCTL_memory_mapping hypercall fails with EPERM where it didn't in xen-4.4, given identical parameters. The hypercall gained an extra permission check as part of 0561e1f01e. Our usecase here is a daemon in dom0 mapping guest RAM to emulate a graphics card, but I currently don't see how that is incompatible with the new permissions check. Migrations from older Xens to Xen-4.5 fairly reliably crash domains (90% of the time, both PV and HVM guests). This includes migrates from older XenServers using the legacy->v2 migration code which is confirmed-good in "upgrade to Xen-4.4" case. The migration v2 code in use is identical. We have certain machines which are showing reliable failure to boot under Xen-4.5, where they worked with 4.4. Symptoms range from the dom0 kernel crashing before printing anything, to complaining that the initrd is corrupt when attempting to decompress. This appears to be hardware specific. I will be looking into all of these issues, to identify whether they are indeed regressions in xen-4.5, or whether I have make some mistakes forward porting our patch queue. Unfortunately, our PCI Passthrough testing has been blocked behind other regressions which have crept in recently, meaning that both sets of tests were equally affected, and no 4.4 vs 4.5 comparison has been possible at this time. I hope this will be fixed by the next time I run a similar pair of tests. ~Andrew _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxx http://lists.xen.org/xen-devel
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