The series (for Xen 4.4) improves the kexec hypercall by making Xen responsible for loading and relocating the image. This allows kexec to be usable by pv-ops kernels and should allow kexec to be usable from a HVM or PVH privileged domain. I have now tested this with a Linux kernel image using the VGA console which was what was causing problems in v9 (this turned out to be a kexec-tools bug). The required patch series for kexec-tools will be posted shortly and are available from the xen-v7 branch of: http://xenbits.xen.org/gitweb/?p=people/dvrabel/kexec-tools.git;a=summary Changes in v10: - Document host state on exec. - Fix kimage_alloc() error path (double free, crash on zero kimage->head). - Check for segment before expanding it in load_v1. - Move kexec_lock define into kexec_swap_images(). Changes in v9: - Update comments to correctly say 4.4. - Minor updates the kexec_reloc assembly to improve maintainability a bit. Changes in v8: - Use #defines for compat ABI structures. - Tweak link time check for kexec_reloc. Changes in v7: - No longer use GUEST_HANDLE_64(), get a uniform ABI by using unions and explicit padding. - Only map the segments and not all of RAM. - Add a mechanism to create mappings for use by the exec'd image (a segment with a NULL buf handle). - Fix a bug where a crash image's code page would by placed at machine address 0 (instead of inside the crash region). Changes in v6: - Fix double free in KEXEC_load_v1 failure path. - Only copy the relocation code and not the whole page. - Add myself as the kexec maintainer. Changes in v5 (not posted to the list): - _rsvd -> _pad in one of the public ABI structures. - Fix bug where trailing pages were not zeroed. This fixes loading a 64-bit Linux kernel using a more recent version of kexec-tools. - Check the relocation code fits into a page at link time. Changes in v4: - Use paddr_t and page_to_maddr() etc. for portability. - Add explicit padding to hypercall structures where required. - Minor cleanup of the kexec_reloc assembly. - Print a message before exec'ing a crash image. - Style fixes (tabs, trailing whitespace) and typos. - Fix a bug where using the V1 interface and unloading a image may crash. Changes in v3: - Provide old struct xen_kexec_load if __XEN_INTERFACE_VERSION__ < 4.3 - Adjust new struct xen_kexec_load to avoid unnecessary padding. - Use domheap pages for the image and control pages. - Remove the DBG() macros from the reloc code. David
