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s390/kexec_file: Load new kernel to absolute 0 

The leading 64 kB of a kernel image doesn't contain any data needed to boot
the new kernel when it was loaded via kexec_file. Thus kexec_file currently
strips them off before loading the image. Keep the leading 64 kB in order
to be able to pass a ipl_report to the next kernel.

Signed-off-by: Philipp Rudo <prudo@linux.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Philipp Rudo 2019-03-07 15:56:34 +01:00 committed by Martin Schwidefsky
parent 8e49642613
commit 653beba24d
5 changed files with 28 additions and 18 deletions
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6
arch/s390/include/asm/kexec.h
View File

@ -43,6 +43,9 @@
/* The native architecture */
#define KEXEC_ARCH KEXEC_ARCH_S390
/* Allow kexec_file to load a segment to 0 */
#define KEXEC_BUF_MEM_UNKNOWN -1
/* Provide a dummy definition to avoid build failures. */
static inline void crash_setup_regs(struct pt_regs *newregs,
struct pt_regs *oldregs) { }
@ -52,6 +55,9 @@ struct s390_load_data {
/* Pointer to the kernel buffer. Used to register cmdline etc.. */
void *kernel_buf;
/* Load address of the kernel_buf. */
unsigned long kernel_mem;
/* Parmarea in the kernel buffer. */
struct parmarea *parm;

16
arch/s390/kernel/kexec_elf.c
View File

@ -39,28 +39,20 @@ static int kexec_file_add_kernel_elf(struct kimage *image,
buf.bufsz = phdr->p_filesz;
buf.mem = ALIGN(phdr->p_paddr, phdr->p_align);
if (image->type == KEXEC_TYPE_CRASH)
buf.mem += crashk_res.start;
buf.memsz = phdr->p_memsz;
data->memsz = ALIGN(data->memsz, phdr->p_align) + buf.memsz;
if (entry - phdr->p_paddr < phdr->p_memsz) {
data->kernel_buf = buf.buffer;
data->kernel_mem = buf.mem;
data->parm = buf.buffer + PARMAREA;
data->memsz += STARTUP_NORMAL_OFFSET;
buf.buffer += STARTUP_NORMAL_OFFSET;
buf.bufsz -= STARTUP_NORMAL_OFFSET;
buf.mem += STARTUP_NORMAL_OFFSET;
buf.memsz -= STARTUP_NORMAL_OFFSET;
}
if (image->type == KEXEC_TYPE_CRASH)
buf.mem += crashk_res.start;
ret = kexec_add_buffer(&buf);
if (ret)
return ret;
data->memsz = ALIGN(data->memsz, phdr->p_align) + buf.memsz;
}
return data->memsz ? 0 : -EINVAL;

9
arch/s390/kernel/kexec_image.c
View File

@ -19,17 +19,18 @@ static int kexec_file_add_kernel_image(struct kimage *image,
buf.image = image;
buf.buffer = image->kernel_buf + STARTUP_NORMAL_OFFSET;
buf.bufsz = image->kernel_buf_len - STARTUP_NORMAL_OFFSET;
buf.buffer = image->kernel_buf;
buf.bufsz = image->kernel_buf_len;
buf.mem = STARTUP_NORMAL_OFFSET;
buf.mem = 0;
if (image->type == KEXEC_TYPE_CRASH)
buf.mem += crashk_res.start;
buf.memsz = buf.bufsz;
data->kernel_buf = image->kernel_buf;
data->kernel_mem = buf.mem;
data->parm = image->kernel_buf + PARMAREA;
data->memsz += buf.memsz + STARTUP_NORMAL_OFFSET;
data->memsz += buf.memsz;
return kexec_add_buffer(&buf);
}

12
arch/s390/kernel/machine_kexec_file.c
View File

@ -17,7 +17,8 @@ const struct kexec_file_ops * const kexec_file_loaders[] = {
NULL,
};
static int kexec_file_update_purgatory(struct kimage *image)
static int kexec_file_update_purgatory(struct kimage *image,
struct s390_load_data *data)
{
u64 entry, type;
int ret;
@ -76,7 +77,7 @@ static int kexec_file_add_purgatory(struct kimage *image,
if (ret)
return ret;
ret = kexec_file_update_purgatory(image);
ret = kexec_file_update_purgatory(image, data);
return ret;
}
@ -136,6 +137,13 @@ void *kexec_file_add_components(struct kimage *image,
if (ret)
return ERR_PTR(ret);
if (data.kernel_mem == 0) {
unsigned long restart_psw = 0x0008000080000000UL;
restart_psw += image->start;
memcpy(data.kernel_buf, &restart_psw, sizeof(restart_psw));
image->start = 0;
}
return NULL;
}

3
arch/s390/kernel/relocate_kernel.S
View File

@ -58,10 +58,13 @@ ENTRY(relocate_kernel)
j .base
.done:
sgr %r0,%r0 # clear register r0
cghi %r3,0
je .diag
la %r4,load_psw-.base(%r13) # load psw-address into the register
o %r3,4(%r4) # or load address into psw
st %r3,4(%r4)
mvc 0(8,%r0),0(%r4) # copy psw to absolute address 0
.diag:
diag %r0,%r0,0x308
.align 8