[xen staging] xen/x86: bzImage parse kernel_alignment

[patchbot@xxxxxxx]

commit c44cac229067faeec8f49247d1cf281723ac2d40
Author:     Jason Andryuk <jason.andryuk@xxxxxxx>
AuthorDate: Mon Mar 11 09:33:35 2024 +0100
Commit:     Jan Beulich <jbeulich@xxxxxxxx>
CommitDate: Mon Mar 11 09:33:35 2024 +0100

    xen/x86: bzImage parse kernel_alignment
    
    Expand bzimage_parse() to return kernel_alignment from the setup_header.
    This will be needed if loading a PVH kernel at a physical offset to
    compensate for a reserved E820 region.
    
    Signed-off-by: Jason Andryuk <jason.andryuk@xxxxxxx>
    Reviewed-by: Stefano Stabellini <sstabellini@xxxxxxxxxx>
    Acked-by: Jan Beulich <jbeulich@xxxxxxxx>
---
 xen/arch/x86/bzimage.c             | 4 +++-
 xen/arch/x86/hvm/dom0_build.c      | 4 +++-
 xen/arch/x86/include/asm/bzimage.h | 2 +-
 xen/arch/x86/pv/dom0_build.c       | 2 +-
 4 files changed, 8 insertions(+), 4 deletions(-)

diff --git a/xen/arch/x86/bzimage.c b/xen/arch/x86/bzimage.c
index ac4fd428be..0f4cfc49f7 100644
--- a/xen/arch/x86/bzimage.c
+++ b/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 long *image_len, unsigned int *align)
 {
     struct setup_header *hdr = (struct setup_header *)(*image_start);
     int err = bzimage_check(hdr, *image_len);
@@ -118,6 +118,8 @@ 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) )
diff --git a/xen/arch/x86/hvm/dom0_build.c b/xen/arch/x86/hvm/dom0_build.c
index 0ceda4140b..bbae8a5645 100644
--- a/xen/arch/x86/hvm/dom0_build.c
+++ b/xen/arch/x86/hvm/dom0_build.c
@@ -548,12 +548,14 @@ 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;
 
-    if ( (rc = bzimage_parse(image_base, &image_start, &image_len)) != 0 )
+    rc = bzimage_parse(image_base, &image_start, &image_len, &align);
+    if ( rc != 0 )
     {
         printk("Error trying to detect bz compressed kernel\n");
         return rc;
diff --git a/xen/arch/x86/include/asm/bzimage.h 
b/xen/arch/x86/include/asm/bzimage.h
index 7ed69d3910..2e04f5cc7b 100644
--- a/xen/arch/x86/include/asm/bzimage.h
+++ b/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 long *image_len, unsigned int *align);
 
 #endif /* __X86_BZIMAGE_H__ */
diff --git a/xen/arch/x86/pv/dom0_build.c b/xen/arch/x86/pv/dom0_build.c
index d8043fa58a..e9fa8a9a82 100644
--- a/xen/arch/x86/pv/dom0_build.c
+++ b/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)) != 0 )
+    if ( (rc = bzimage_parse(image_base, &image_start, &image_len, NULL)) != 0 
)
         return rc;
 
     if ( (rc = elf_init(&elf, image_start, image_len)) != 0 )
--
generated by git-patchbot for /home/xen/git/xen.git#staging