Re: [Xen-devel] Problems booting 32-bit PV; just me or more widespread?

[Andy Smith <andy@xxxxxxxxxxxxxx>]

Hi Boris,

On Thu, Aug 30, 2018 at 05:59:38PM -0400, Boris Ostrovsky wrote:
> On 08/29/2018 08:51 PM, Andy Smith wrote:
> > I cannot get any of the Ubuntu packaged 32-bit mainline kernels
> > after v4.13.16 that are found at
> > http://kernel.ubuntu.com/~kernel-ppa/mainline/ to boot in 32-bit PV
> > mode. All of them from v4.14.0rc1 onwards crash on xl create either
> > saying "error: no XEN note found." 
> 
> Don't know what this error is, perhaps kernel was not compiled with
> CONFIG_XEN.

So, your patch gets the packaged linux-image-generic working. As
mentioned above, in the course of looking into this problem I found
that many of the other 32-bit Ubuntu kernels crashed as well.

You're probably right that whatever I was testing above was not
compiled with CONFIG_XEN.

This one should work though as it's their netboot installer:

    
http://archive.ubuntu.com/ubuntu/dists/bionic/main/installer-i386/current/images/netboot/xen/

When I do xl create with this one (direct kernel boot), I get this
crash in the xl dmesg:

(XEN) domain_crash_sync called from entry.S: fault at ffff82d0803510d8 
x86_64/compat/entry.S#compat_create_bounce_frame+0xd9/0xed
(XEN) Domain 73 (vcpu#0) crashed on cpu#4:
(XEN) ----[ Xen-4.10.1  x86_64  debug=n   Not tainted ]----
(XEN) CPU:    4
(XEN) RIP:    e019:[<00000000c1038ef9>]
(XEN) RFLAGS: 0000000000000292   EM: 1   CONTEXT: pv guest (d73v0)
(XEN) rax: 00000000c1cd3540   rbx: 00000000c18a01e0   rcx: 0000000000000000
(XEN) rdx: 0000000000000000   rsi: 00000000c1bfdeec   rdi: 00000000c1bfdf34
(XEN) rbp: 00000000c1bfdf10   rsp: 00000000c1bfdecc   r8:  0000000000000000
(XEN) r9:  0000000000000000   r10: 0000000000000000   r11: 0000000000000000
(XEN) r12: 0000000000000000   r13: 0000000000000000   r14: 0000000000000000
(XEN) r15: 0000000000000000   cr0: 0000000080050033   cr4: 00000000003526e0
(XEN) cr3: 0000003f56d54000   cr2: 0000000000000014
(XEN) fsb: 0000000000000000   gsb: 0000000000000000   gss: 0000000000000000
(XEN) ds: e021   es: e021   fs: e021   gs: e021   ss: e021   cs: e019
(XEN) Guest stack trace from esp=c1bfdecc:
(XEN)   00000000 c1038ef9 0001e019 00010092 c1cd3540 00000000 00000000 00000000
(XEN)   00000000 00000000 00000000 ffffffff c1bfdf24 c1cd3540 c1cd3540 c1bfdf30
(XEN)   c1bfdf34 c1bfdf50 c1039a77 c1bfdf3c c1bfdf38 c1bfdf40 0000202e 00001000
(XEN)   00000000 00000000 80000008 00000000 00000000 00000000 00000000 c248a000
(XEN)   c1eda000 c1bfdffc c1cf5222 00000000 00000000 00000000 00000000 00000000
(XEN)   00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
(XEN)   00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
(XEN)   00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
(XEN)   00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
(XEN)   00000000 00000000 c248a000 c1eda000 00000000 00000000 00000000 00000000
(XEN)   00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
(XEN)   00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
(XEN)   00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
(XEN)   00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
(XEN)   00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
(XEN)   00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
(XEN)   00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
(XEN)   00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
(XEN)   00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
(XEN)   00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000

Any ideas about that one?

Thanks,
Andy

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