Commit e49bb0a2 authored by Philipp Rudo's avatar Philipp Rudo Committed by Martin Schwidefsky

s390/kexec_file: Add image loader

Add an image loader for kexec_file_load. For simplicity first skip crash
support. The functions defined in machine_kexec_file will later be shared
with the ELF loader.
Signed-off-by: default avatarPhilipp Rudo <prudo@linux.vnet.ibm.com>
Reviewed-by: default avatarMartin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: default avatarMartin Schwidefsky <schwidefsky@de.ibm.com>
parent 71406883
...@@ -46,4 +46,26 @@ ...@@ -46,4 +46,26 @@
static inline void crash_setup_regs(struct pt_regs *newregs, static inline void crash_setup_regs(struct pt_regs *newregs,
struct pt_regs *oldregs) { } struct pt_regs *oldregs) { }
struct kimage;
struct s390_load_data {
/* Pointer to the kernel buffer. Used to register cmdline etc.. */
void *kernel_buf;
/* Total size of loaded segments in memory. Used as an offset. */
size_t memsz;
/* Load address of initrd. Used to register INITRD_START in kernel. */
unsigned long initrd_load_addr;
};
int kexec_file_add_purgatory(struct kimage *image,
struct s390_load_data *data);
int kexec_file_add_initrd(struct kimage *image,
struct s390_load_data *data,
char *initrd, unsigned long initrd_len);
int *kexec_file_update_kernel(struct kimage *iamge,
struct s390_load_data *data);
extern const struct kexec_file_ops s390_kexec_image_ops;
#endif /*_S390_KEXEC_H */ #endif /*_S390_KEXEC_H */
...@@ -82,7 +82,7 @@ obj-$(CONFIG_FUNCTION_TRACER) += mcount.o ftrace.o ...@@ -82,7 +82,7 @@ obj-$(CONFIG_FUNCTION_TRACER) += mcount.o ftrace.o
obj-$(CONFIG_CRASH_DUMP) += crash_dump.o obj-$(CONFIG_CRASH_DUMP) += crash_dump.o
obj-$(CONFIG_UPROBES) += uprobes.o obj-$(CONFIG_UPROBES) += uprobes.o
obj-$(CONFIG_KEXEC_FILE) += machine_kexec_file.o obj-$(CONFIG_KEXEC_FILE) += machine_kexec_file.o kexec_image.o
obj-$(CONFIG_PERF_EVENTS) += perf_event.o perf_cpum_cf.o perf_cpum_sf.o obj-$(CONFIG_PERF_EVENTS) += perf_event.o perf_cpum_cf.o perf_cpum_sf.o
obj-$(CONFIG_PERF_EVENTS) += perf_cpum_cf_events.o perf_regs.o obj-$(CONFIG_PERF_EVENTS) += perf_cpum_cf_events.o perf_regs.o
......
// SPDX-License-Identifier: GPL-2.0
/*
* Image loader for kexec_file_load system call.
*
* Copyright IBM Corp. 2018
*
* Author(s): Philipp Rudo <prudo@linux.vnet.ibm.com>
*/
#include <linux/errno.h>
#include <linux/kernel.h>
#include <linux/kexec.h>
#include <asm/setup.h>
static int kexec_file_add_image_kernel(struct kimage *image,
struct s390_load_data *data,
char *kernel, unsigned long kernel_len)
{
struct kexec_buf buf;
int ret;
buf.image = image;
buf.buffer = kernel + STARTUP_NORMAL_OFFSET;
buf.bufsz = kernel_len - STARTUP_NORMAL_OFFSET;
buf.mem = STARTUP_NORMAL_OFFSET;
buf.memsz = buf.bufsz;
ret = kexec_add_buffer(&buf);
data->kernel_buf = kernel;
data->memsz += buf.memsz + STARTUP_NORMAL_OFFSET;
return ret;
}
static void *s390_image_load(struct kimage *image,
char *kernel, unsigned long kernel_len,
char *initrd, unsigned long initrd_len,
char *cmdline, unsigned long cmdline_len)
{
struct s390_load_data data = {0};
int ret;
/* We don't support crash kernels yet. */
if (image->type == KEXEC_TYPE_CRASH)
return ERR_PTR(-ENOTSUPP);
ret = kexec_file_add_image_kernel(image, &data, kernel, kernel_len);
if (ret)
return ERR_PTR(ret);
if (initrd) {
ret = kexec_file_add_initrd(image, &data, initrd, initrd_len);
if (ret)
return ERR_PTR(ret);
}
ret = kexec_file_add_purgatory(image, &data);
if (ret)
return ERR_PTR(ret);
return kexec_file_update_kernel(image, &data);
}
static int s390_image_probe(const char *buf, unsigned long len)
{
/* Can't reliably tell if an image is valid. Therefore give the
* user whatever he wants.
*/
return 0;
}
const struct kexec_file_ops s390_kexec_image_ops = {
.probe = s390_image_probe,
.load = s390_image_load,
};
...@@ -12,9 +12,84 @@ ...@@ -12,9 +12,84 @@
#include <asm/setup.h> #include <asm/setup.h>
const struct kexec_file_ops * const kexec_file_loaders[] = { const struct kexec_file_ops * const kexec_file_loaders[] = {
&s390_kexec_image_ops,
NULL, NULL,
}; };
int *kexec_file_update_kernel(struct kimage *image,
struct s390_load_data *data)
{
unsigned long *loc;
if (image->cmdline_buf_len >= ARCH_COMMAND_LINE_SIZE)
return ERR_PTR(-EINVAL);
if (image->cmdline_buf_len)
memcpy(data->kernel_buf + COMMAND_LINE_OFFSET,
image->cmdline_buf, image->cmdline_buf_len);
if (image->initrd_buf) {
loc = (unsigned long *)(data->kernel_buf + INITRD_START_OFFSET);
*loc = data->initrd_load_addr;
loc = (unsigned long *)(data->kernel_buf + INITRD_SIZE_OFFSET);
*loc = image->initrd_buf_len;
}
return NULL;
}
static int kexec_file_update_purgatory(struct kimage *image)
{
u64 entry, type;
int ret;
entry = STARTUP_NORMAL_OFFSET;
ret = kexec_purgatory_get_set_symbol(image, "kernel_entry", &entry,
sizeof(entry), false);
return ret;
}
int kexec_file_add_purgatory(struct kimage *image, struct s390_load_data *data)
{
struct kexec_buf buf;
int ret;
buf.image = image;
data->memsz = ALIGN(data->memsz, PAGE_SIZE);
buf.mem = data->memsz;
ret = kexec_load_purgatory(image, &buf);
if (ret)
return ret;
ret = kexec_file_update_purgatory(image);
return ret;
}
int kexec_file_add_initrd(struct kimage *image, struct s390_load_data *data,
char *initrd, unsigned long initrd_len)
{
struct kexec_buf buf;
int ret;
buf.image = image;
buf.buffer = initrd;
buf.bufsz = initrd_len;
data->memsz = ALIGN(data->memsz, PAGE_SIZE);
buf.mem = data->memsz;
buf.memsz = buf.bufsz;
data->initrd_load_addr = buf.mem;
data->memsz += buf.memsz;
ret = kexec_add_buffer(&buf);
return ret;
}
/* /*
* The kernel is loaded to a fixed location. Turn off kexec_locate_mem_hole * The kernel is loaded to a fixed location. Turn off kexec_locate_mem_hole
* and provide kbuf->mem by hand. * and provide kbuf->mem by hand.
......
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