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.
Daniel
arch/x86/Kconfig | 3 +
arch/x86/include/asm/kexec.h | 10 +-
arch/x86/include/asm/xen/hypercall.h | 6 +
arch/x86/include/asm/xen/kexec.h | 79 ++++
arch/x86/kernel/machine_kexec_64.c | 12 +-
arch/x86/kernel/vmlinux.lds.S | 7 +-
arch/x86/xen/Kconfig | 1 +
arch/x86/xen/Makefile | 3 +
arch/x86/xen/enlighten.c | 11 +
arch/x86/xen/kexec.c | 150 +++++++
arch/x86/xen/machine_kexec_32.c | 226 +++++++++++
arch/x86/xen/machine_kexec_64.c | 318 +++++++++++++++
arch/x86/xen/relocate_kernel_32.S | 323 +++++++++++++++
arch/x86/xen/relocate_kernel_64.S | 309 ++++++++++++++
drivers/xen/sys-hypervisor.c | 42 ++-
include/linux/kexec.h | 26 ++-
include/xen/interface/xen.h | 33 ++
kernel/Makefile | 1 +
kernel/kexec-firmware.c | 743 ++++++++++++++++++++++++++++++++++
kernel/kexec.c | 46 ++-
20 files changed, 2331 insertions(+), 18 deletions(-)
Daniel Kiper (11):
kexec: introduce kexec firmware support
x86/kexec: Add extra pointers to transition page table PGD, PUD, PMD and PTE
xen: Introduce architecture independent data for kexec/kdump
x86/xen: Introduce architecture dependent data for kexec/kdump
x86/xen: Register resources required by kexec-tools
x86/xen: Add i386 kexec/kdump implementation
x86/xen: Add x86_64 kexec/kdump implementation
x86/xen: Add kexec/kdump Kconfig and makefile rules
x86/xen/enlighten: Add init and crash kexec/kdump hooks
drivers/xen: Export vmcoreinfo through sysfs
x86: Add Xen kexec control code size check to linker script
