Re: [Xen-devel] [PATCH v4] xen PVonHVM: move shared_info to reserved memory area

Olaf Hering
2012-10-30T17:03:28Z

On Tue, Oct 30, Jan Beulich wrote:

> And iirc you're doing this relocation because otherwise the newly
> booting kernel image may get overwritten at an (from its
> perspective) arbitrary location. What I'm trying to point out is
> that the shared info structure is not the only thing (potentially)
> inside the kernel image that might get overwritten - the relocated
> (by the old kernel) vCPU info may as well. Plus I think the new
> kernel has no way of relocating it a second time (including back
> into the shared info structure) with how the hypervisor works at
> present.

Thanks, I have not looked at this, nor was I aware of it until now.
I will see what needs to be done.

Is this also an issue with the xenlinux based PVonHVM code?

Olaf