Re: [Xen-users] regression in 4.3.3 - can't boot anymore from GPT disk

[Ian Campbell <Ian.Campbell@xxxxxxxxxx>]

On Mon, 2015-01-19 at 13:22 +0100, Atom2 wrote:
> Hi guys,
> After updating to the latest version of xen 4.3.3 on gentoo (from 
> 4.3.3-r2 to 4.3.3-r3) I am unable to start two of my previously 
> flawlessyly working freebsd HVM domUs; a third one is still working fine 
> (that's the pfsense domU which is based on freebsd as well).
> 
> Upon investigation it turned out that the working freebsd (pfsense) domU 
> uses MBR for the disk partition schema wheras the two other domUs use 
> GPT partitioned disks.
> 
> Both non-working domUs simply hang (but consume CPU cycles) and don't 
> start any part of the BSD bootloader. It appears as if the disk is not 
> found. The messages in the VNC screen are as follows:
> ====== VNC screen ======
> SeaBIOS (version ?-20141222_100956-vm-host)
> 
> Press F12 for boot menu.
> 
> Booting from Hard Disk...
> ====== end VNC screen =======
> 
> On the (serial) console which is redirected to a GNU-screen session the 
> following information is displayed:
> ======= serial console ========
> Parsing config from /etc/xen/auto/dc1
> xc: info: VIRTUAL MEMORY ARRANGEMENT:
>    Loader:        0000000000100000->00000000001c1284
>    Modules:       0000000000000000->0000000000000000
>    TOTAL:         0000000000000000->000000007f800000
>    ENTRY ADDRESS: 0000000000100000
> xc: info: PHYSICAL MEMORY ALLOCATION:
>    4KB PAGES: 0x0000000000000200
>    2MB PAGES: 0x00000000000003fb
>    1GB PAGES: 0x0000000000000000
> Daemon running with PID 4653
> ======= end serial console ========
> 
> The setup for all three domU disks (the working and the two 
> non-woprking) is based on LVM and it's always the complete disk (i.e. no 
> partitions) that's being passed through to XEN. The only visible 
> difference is MBR versus GPT.
> 
> All freebsd installations on the LVM disks are o.k. and working because 
> I am able to fire-up the non-booting domUs by starting from a live CD 
> through XEN (passing through the live CD ISO file and changing the boot 
> order to D instead of C) by instructing the (then appearing) bootloader 
> to start the installed system from the disk instead of from the CD.
> 
> I wonder whether recently there have been any changes to the way (GPT) 
> disks are handled in SeaBIOS?

Since you've only bumped the Gentoo rev and are still using the same
base version of Xen whatever changes have been made would have been done
by the Gentoo maintainer between r2 and r3, not by xen project folks
(modulo the fac that the changes might be backports). You may want to
talk to them about this, or consult the gentoo changelog etc.

Ian.



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