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Re: [Xen-devel] Xen 4.5 Development Update (RC4)

On Tue, Dec 16, 2014 at 05:43:08PM +0000, Andrew Cooper wrote:
> On 16/12/14 16:13, konrad.wilk@xxxxxxxxxx wrote:
> > Xen 4.5-rc4 was out on Monday (Dec 15th). This is the last RC and then
> > we have the General Release on Jan 7th!
> >
> > Details for the test-day are at
> >
> > http://wiki.xen.org/wiki/Xen_4.5_RC4_test_instructions
> >
> > In terms of bugs, we have:
> From the XenServer testing.

Thank you for doing this testing!
> * Fail to reliably boot on IBM Flex x222 blades, apparent regression
> from 4.4
> I have declared this a latent BIOS bug, and not a regression from 4.4. 
> Across regular reboots, the exact positions of the ACPI tables, and the
> e820 layout is unstable.  The first consistent difference between 4.4
> and 4.5 is that 4.4 reports 1 MBR signature while 4.5 reports 0.  This
> is because the int $0x13, ah=2 call is returning differently.  I can get
> the call to return differently (and correctly for 4.5) by simply making
> the boot trampoline larger (with my debugging routines but not being
> called).

This sounds very familiar, but I can't place where I saw mention of
a similar issue.
> * VM fail to resume on upgrade from Xen < 4.5
> This is the issue I am currently looking into.  Currently, all the
> "upgrade from older XenServer" tests are failing due to VMs crashing on
> resume.  I have not yet identified whether this is a XenServer issue or

> a Xen issue.  Lifecycle operations on 4.5 itself are all fine including
> both suspend/resume and migrate.
> ~Andrew

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