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authorPhilipp Rudo <prudo@linux.vnet.ibm.com>2017-09-05 11:55:23 +0200
committerMartin Schwidefsky <schwidefsky@de.ibm.com>2018-04-16 09:10:22 +0200
commitee337f5469fd67f22d231e520ec4189ce0589d92 (patch)
tree7b2d0e72573aaca14b54520ffa2c59fbcfaac81a /arch/s390/kernel
parente49bb0a27fa3c6ec45cc13e2102a6ec13c4ae697 (diff)
downloadlinux-ee337f5469fd67f22d231e520ec4189ce0589d92.tar.bz2
s390/kexec_file: Add crash support to image loader
Add support to load a crash kernel to the image loader. This requires extending the purgatory. Signed-off-by: Philipp Rudo <prudo@linux.vnet.ibm.com> Reviewed-by: Martin Schwidefsky <schwidefsky@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Diffstat (limited to 'arch/s390/kernel')
-rw-r--r--arch/s390/kernel/kexec_image.c6
-rw-r--r--arch/s390/kernel/machine_kexec_file.c45
2 files changed, 46 insertions, 5 deletions
diff --git a/arch/s390/kernel/kexec_image.c b/arch/s390/kernel/kexec_image.c
index 7f5021e6c242..3800852595e8 100644
--- a/arch/s390/kernel/kexec_image.c
+++ b/arch/s390/kernel/kexec_image.c
@@ -25,6 +25,8 @@ static int kexec_file_add_image_kernel(struct kimage *image,
buf.bufsz = kernel_len - STARTUP_NORMAL_OFFSET;
buf.mem = STARTUP_NORMAL_OFFSET;
+ if (image->type == KEXEC_TYPE_CRASH)
+ buf.mem += crashk_res.start;
buf.memsz = buf.bufsz;
ret = kexec_add_buffer(&buf);
@@ -43,10 +45,6 @@ static void *s390_image_load(struct kimage *image,
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);
diff --git a/arch/s390/kernel/machine_kexec_file.c b/arch/s390/kernel/machine_kexec_file.c
index 2a2ceece77b0..75aea2c1d823 100644
--- a/arch/s390/kernel/machine_kexec_file.c
+++ b/arch/s390/kernel/machine_kexec_file.c
@@ -28,6 +28,14 @@ int *kexec_file_update_kernel(struct kimage *image,
memcpy(data->kernel_buf + COMMAND_LINE_OFFSET,
image->cmdline_buf, image->cmdline_buf_len);
+ if (image->type == KEXEC_TYPE_CRASH) {
+ loc = (unsigned long *)(data->kernel_buf + OLDMEM_BASE_OFFSET);
+ *loc = crashk_res.start;
+
+ loc = (unsigned long *)(data->kernel_buf + OLDMEM_SIZE_OFFSET);
+ *loc = crashk_res.end - crashk_res.start + 1;
+ }
+
if (image->initrd_buf) {
loc = (unsigned long *)(data->kernel_buf + INITRD_START_OFFSET);
*loc = data->initrd_load_addr;
@@ -44,9 +52,40 @@ static int kexec_file_update_purgatory(struct kimage *image)
u64 entry, type;
int ret;
- entry = STARTUP_NORMAL_OFFSET;
+ if (image->type == KEXEC_TYPE_CRASH) {
+ entry = STARTUP_KDUMP_OFFSET;
+ type = KEXEC_TYPE_CRASH;
+ } else {
+ entry = STARTUP_NORMAL_OFFSET;
+ type = KEXEC_TYPE_DEFAULT;
+ }
+
ret = kexec_purgatory_get_set_symbol(image, "kernel_entry", &entry,
sizeof(entry), false);
+ if (ret)
+ return ret;
+
+ ret = kexec_purgatory_get_set_symbol(image, "kernel_type", &type,
+ sizeof(type), false);
+ if (ret)
+ return ret;
+
+ if (image->type == KEXEC_TYPE_CRASH) {
+ u64 crash_size;
+
+ ret = kexec_purgatory_get_set_symbol(image, "crash_start",
+ &crashk_res.start,
+ sizeof(crashk_res.start),
+ false);
+ if (ret)
+ return ret;
+
+ crash_size = crashk_res.end - crashk_res.start + 1;
+ ret = kexec_purgatory_get_set_symbol(image, "crash_size",
+ &crash_size,
+ sizeof(crash_size),
+ false);
+ }
return ret;
}
@@ -59,6 +98,8 @@ int kexec_file_add_purgatory(struct kimage *image, struct s390_load_data *data)
data->memsz = ALIGN(data->memsz, PAGE_SIZE);
buf.mem = data->memsz;
+ if (image->type == KEXEC_TYPE_CRASH)
+ buf.mem += crashk_res.start;
ret = kexec_load_purgatory(image, &buf);
if (ret)
@@ -81,6 +122,8 @@ int kexec_file_add_initrd(struct kimage *image, struct s390_load_data *data,
data->memsz = ALIGN(data->memsz, PAGE_SIZE);
buf.mem = data->memsz;
+ if (image->type == KEXEC_TYPE_CRASH)
+ buf.mem += crashk_res.start;
buf.memsz = buf.bufsz;
data->initrd_load_addr = buf.mem;