diff options
Diffstat (limited to 'arch/powerpc/kernel/machine_kexec_64.c')
| -rw-r--r-- | arch/powerpc/kernel/machine_kexec_64.c | 20 |
1 files changed, 20 insertions, 0 deletions
diff --git a/arch/powerpc/kernel/machine_kexec_64.c b/arch/powerpc/kernel/machine_kexec_64.c index de6b70eac51d..022d2f613b7b 100644 --- a/arch/powerpc/kernel/machine_kexec_64.c +++ b/arch/powerpc/kernel/machine_kexec_64.c @@ -260,6 +260,12 @@ static void kexec_prepare_cpus(void) static union thread_union kexec_stack __init_task_data = { }; +/* + * For similar reasons to the stack above, the kexecing CPU needs to be on a + * static PACA; we switch to kexec_paca. + */ +struct paca_struct kexec_paca; + /* Our assembly helper, in kexec_stub.S */ extern NORET_TYPE void kexec_sequence(void *newstack, unsigned long start, void *image, void *control, @@ -287,6 +293,20 @@ void default_machine_kexec(struct kimage *image) kexec_stack.thread_info.task = current_thread_info()->task; kexec_stack.thread_info.flags = 0; + /* We need a static PACA, too; copy this CPU's PACA over and switch to + * it. Also poison per_cpu_offset to catch anyone using non-static + * data. + */ + memcpy(&kexec_paca, get_paca(), sizeof(struct paca_struct)); + kexec_paca.data_offset = 0xedeaddeadeeeeeeeUL; + paca = (struct paca_struct *)RELOC_HIDE(&kexec_paca, 0) - + kexec_paca.paca_index; + setup_paca(&kexec_paca); + + /* XXX: If anyone does 'dynamic lppacas' this will also need to be + * switched to a static version! + */ + /* Some things are best done in assembly. Finding globals with * a toc is easier in C, so pass in what we can. */ |