On 12/26/2012 06:18 PM, Daniel Kiper wrote: > Hi, > > This set of patches contains initial kexec/kdump implementation for Xen v3. > Currently only dom0 is supported, however, almost all infrustructure > required for domU support is ready. > > Jan Beulich suggested to merge Xen x86 assembler code with baremetal x86 code. > This could simplify and reduce a bit size of kernel code. However, this solution > requires some changes in baremetal x86 code. First of all code which establishes > transition page table should be moved back from machine_kexec_$(BITS).c to > relocate_kernel_$(BITS).S. Another important thing which should be changed in that > case is format of page_list array. Xen kexec hypercall requires to alternate physical > addresses with virtual ones. These and other required stuff have not been done in that > version because I am not sure that solution will be accepted by kexec/kdump maintainers. > I hope that this email spark discussion about that topic. > I want a detailed list of the constraints that this assumes and therefore imposes on the native implementation as a result of this. We have had way too many patches where Xen PV hacks effectively nailgun arbitrary, and sometimes poor, design decisions in place and now we can't fix them. -hpa -- H. Peter Anvin, Intel Open Source Technology Center I work for Intel. I don't speak on their behalf.
