Re: [Xen-devel] PVH guess crash with memory < maxmem

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 08.08.16 at 12:40, <marmarek@xxxxxxxxxxxxxxxxxxxxxx> wrote:
> I'm having troubles with starting PVH guest when memory < maxmem. Exact
> crash message:
> 
>     (XEN) d2v0 EPT violation 0x182 (-w-/---) gpa 0x0000003e7ff000     mfn 
> 0xffffffffffffffff type 4
>     (XEN) d2v0 Walking EPT tables for GFN 3e7ff:
>     (XEN) d2v0  gfn exceeds max_mapped_pfn 19000
>     (XEN) d2v0  --- GLA 0xffff88003e7ff000
>     (XEN) domain_crash called from vmx.c:3022
>     (XEN) Domain 2 (vcpu#0) crashed on cpu#2:
>     (XEN) ----[ Xen-4.7.0  x86_64  debug=n  Not tainted ]----
>     (XEN) CPU:    2
>     (XEN) RIP:    0010:[<ffffffff813b4d62>]
>     (XEN) RFLAGS: 0000000000010016   CONTEXT: hvm guest (d2v0)
>     (XEN) rax: 0000000000000000   rbx: 0000000000000001   rcx: 
> 000000000000003f
>     (XEN) rdx: 000000003e7ff000   rsi: 0000000002b96000   rdi: 
> ffff88003e7ff000
>     (XEN) rbp: ffffffff81c03b68   rsp: ffffffff81c03b40   r8: 0000000000000200
>     (XEN) r9:  0000000000000000   r10: 0000000002b96000   r11: 
> 0000000000000000
>     (XEN) r12: 0000000000000001   r13: 000000000003e7ff   r14: 
> ffff880000000000
>     (XEN) r15: ffff880001c10828   cr0: 0000000080050033   cr4: 
> 0000000000000020
>     (XEN) cr3: 0000000001c0e000   cr2: 0000000000000000
>     (XEN) ds: 0000   es: 0000   fs: 0000   gs: 0000   ss: 0000   cs: 0010
>     (XEN) Guest stack trace from rsp=ffffffff81c03b40:
>     (XEN)   Fault while accessing guest memory.
> 
> Guest kernel: 4.1.13, guest config attached.
> 
> Is there any way around it, or such configuration isn't supported yet?

Indeed iirc PVHv1 and PoD are incompatible with one another,
and I don't know any possible workaround. And then I'm not
sure it's worth your time playing with PVHv1 in the first place.

Jan


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