Revert "xen/x86: bzImage parse kernel_alignment"

A new ELF note will specify the alignment for a relocatable PVH kernel.
ELF notes are suitable for vmlinux and other ELF files, so this
Linux-specific bzImage parsing in unnecessary.

This reverts commit c44cac2290.

Signed-off-by: Jason Andryuk <jason.andryuk@amd.com>
Acked-by: Jan Beulich <jbeulich@suse.com>

xen/arch/x86/bzimage.c

@@ -105,7 +105,7 @@ unsigned long __init bzimage_headroom(void *image_start,
 }
 
 int __init bzimage_parse(void *image_base, void **image_start,
-                         unsigned long *image_len, unsigned int *align)
+                         unsigned long *image_len)
 {
     struct setup_header *hdr = (struct setup_header *)(*image_start);
     int err = bzimage_check(hdr, *image_len);
@@ -118,8 +118,6 @@ int __init bzimage_parse(void *image_base, void **image_start,
     {
         *image_start += (hdr->setup_sects + 1) * 512 + hdr->payload_offset;
         *image_len = hdr->payload_length;
-        if ( align )
-            *align = hdr->kernel_alignment;
     }
 
     if ( elf_is_elfbinary(*image_start, *image_len) )

xen/arch/x86/hvm/dom0_build.c

@@ -548,14 +548,12 @@ static int __init pvh_load_kernel(struct domain *d, const module_t *image,
     struct elf_binary elf;
     struct elf_dom_parms parms;
     paddr_t last_addr;
-    unsigned int align = 0;
     struct hvm_start_info start_info = { 0 };
     struct hvm_modlist_entry mod = { 0 };
     struct vcpu *v = d->vcpu[0];
     int rc;
 
-    rc = bzimage_parse(image_base, &image_start, &image_len, &align);
-    if ( rc != 0 )
+    if ( (rc = bzimage_parse(image_base, &image_start, &image_len)) != 0 )
     {
         printk("Error trying to detect bz compressed kernel\n");
         return rc;

xen/arch/x86/include/asm/bzimage.h

@@ -6,6 +6,6 @@
 unsigned long bzimage_headroom(void *image_start, unsigned long image_length);
 
 int bzimage_parse(void *image_base, void **image_start,
-                  unsigned long *image_len, unsigned int *align);
+                  unsigned long *image_len);
 
 #endif /* __X86_BZIMAGE_H__ */

xen/arch/x86/pv/dom0_build.c

@@ -416,7 +416,7 @@ int __init dom0_construct_pv(struct domain *d,
 
     d->max_pages = ~0U;
 
-    if ( (rc = bzimage_parse(image_base, &image_start, &image_len, NULL)) != 0 )
+    if ( (rc = bzimage_parse(image_base, &image_start, &image_len)) != 0 )
         return rc;
 
     if ( (rc = elf_init(&elf, image_start, image_len)) != 0 )