Re: [Xen-devel] Regression between Xen 4.6.0 and 4.7.0, Direct kernel boot on a qemu-xen and seabios HVM guest doesn't work anymore.

[Doug Goldstein <cardoe@xxxxxxxxxx>]

On 8/25/16 4:21 PM, linux@xxxxxxxxxxxxxx wrote:
> Today i tried to switch some of my HVM guests (qemu-xen) from booting of
> a kernel *inside* the guest, to a dom0 supplied kernel, which is
> described as "Direct Kernel Boot" here:
> https://xenbits.xen.org/docs/unstable/man/xl.cfg.5.html :
> 
>     Direct Kernel Boot
> 
>     Direct kernel boot allows booting directly from a kernel and initrd
> stored in the host physical
>     machine OS, allowing command line arguments to be passed directly.
> PV guest direct kernel boot
>     is supported. HVM guest direct kernel boot is supported with
> limitation (it's supported when
>     using qemu-xen and default BIOS 'seabios'; not supported in case of
> stubdom-dm and old rombios.)
> 
>     kernel="PATHNAME"    Load the specified file as the kernel image.
>     ramdisk="PATHNAME"   Load the specified file as the ramdisk.
> 
> But qemu fails to start, output appended below.
> 
> I tested with:
> - current Xen-unstable, which fails.
> - xen-stable-4.7.0 release, which fails.
> - xen-stable-4.6.0 release, works fine.

Can you include the logs from xl dmesg around that time frame as well?
Just wondering how much RAM you're domain is defined with as well?

-- 
Doug Goldstein

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