[Xen-devel] UEFI Boot Order Not Respected

[Tomasz Tuzel <tomasztuzel@xxxxxxxxx>]

Hi everyone,

We've been running into an issue with boot ordering when using OVMF (specifically, with PXE booting). In particular, the issue is the "-boot order=ABC" seems to have variable behavior depending on what it receives. This is only an issue with UEFI; legacy handles this condition correctly. Here's a table documenting several combinations in the HVM guest configuration: OS installed || ISO attached || Boot order || Result ---------------------------------------------------- N || N || n || PXE boot ---------------------------------------------------- N || Y || n || Prompt for CD boot, if not pressed drop to PXE boot ---------------------------------------------------- Y || N || n || Boot from hard drive ---------------------------------------------------- Y || Y || n || Prompt for CD boot, if not pressed drop to hard drive ---------------------------------------------------- N || Y || cd || Prompt for CD boot, if not pressed drop to PXE boot ---------------------------------------------------- N || N || cd || PXE boot ---------------------------------------------------- Y || N || cd || Boot from hardrive ---------------------------------------------------- Y || Y || cd || Prompt for CD boot, if not pressed drop to hard drive ---------------------------------------------------- N || N || cn || PXE boot ---------------------------------------------------- N || Y || cn || Prompt for CD boot, if not pressed drop to PXE boot ---------------------------------------------------- Y || N || cn || Boot from hard drive ---------------------------------------------------- Y || Y || cn || Prompt for CD boot, if not pressed drop to hard drive ---------------------------------------------------- N || N || nd || PXE boot ---------------------------------------------------- N || Y || nd || Prompt for CD boot, if not pressed drop to PXE boot ---------------------------------------------------- Y || N || nd || Boot from hardrive ---------------------------------------------------- Y || Y || nd || Prompt for CD boot, if not pressed drop to hard drive ---------------------------------------------------- My running suspicion is that the fw_cfg file is being incorrectly configured. However, I do not see what is typically cited as a problem in the QEMU invocation that is being tested on our end, namely the conflicting usage of "-boot order=ABC" and "-device XYZ,bootindex=N". I don't really see any chatter about this on any of the mailing lists that I've dug through, but it was just last week that a fix was posted for the issue in which the hvmloader firmware leaves address decoding enabled for enumerated PCI devices. Thus, I'm wondering if this has simply not shown up on anyone's radar yet. Is this is a known issue?

Tomasz

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