Re: [Xen-devel] [PATCH v2 01/11] kexec: introduce kexec_ops struct

On Fri, Nov 23, 2012 at 10:51:08AM +0000, Ian Campbell wrote:

On Fri, 2012-11-23 at 10:37 +0000, Daniel Kiper wrote:

quoted

On Fri, Nov 23, 2012 at 09:53:37AM +0000, Jan Beulich wrote:

quoted

quoted

quoted

quoted

On 23.11.12 at 02:56, Andrew Cooper [off-list ref] wrote:

The crash region (as specified by crashkernel= on the Xen command line)
is isolated from dom0.
[...]

But all of this _could_ be done completely independent of the
Dom0 kernel's kexec infrastructure (i.e. fully from user space,
invoking the necessary hypercalls through the privcmd driver).

No, this is impossible. kexec/kdump image lives in dom0 kernel memory
until execution.

Are you sure? I could have sworn they lived in the hypervisor owned
memory set aside by the crashkernel= parameter as Andy suggested.

I am sure. It is moved to final resting place when
relocate_kernel() is called by hypervisor.

Daniel