[Xen-devel] [RFC PATCH 3/3] Add KEXEC_RANGE_MA_LIVEUPDATE

[David Woodhouse <dwmw2@xxxxxxxxxxxxx>]

From: David Woodhouse <dwmw@xxxxxxxxxxxx>

This allows kexec userspace to tell the next Xen where the range is,
on its command line.

Signed-off-by: David Woodhouse <dwmw@xxxxxxxxxxxx>
---
 xen/arch/x86/machine_kexec.c | 15 ++++++++++++---
 xen/arch/x86/setup.c         |  2 +-
 xen/include/public/kexec.h   |  1 +
 3 files changed, 14 insertions(+), 4 deletions(-)

diff --git a/xen/arch/x86/machine_kexec.c b/xen/arch/x86/machine_kexec.c
index b70d5a6a86..f0c4617234 100644
--- a/xen/arch/x86/machine_kexec.c
+++ b/xen/arch/x86/machine_kexec.c
@@ -184,11 +184,20 @@ void machine_kexec(struct kexec_image *image)
                 image->head, image->entry_maddr, reloc_flags);
 }
 
+extern unsigned long lu_bootmem_start, lu_bootmem_size;
+
 int machine_kexec_get(xen_kexec_range_t *range)
 {
-       if (range->range != KEXEC_RANGE_MA_XEN)
-               return -EINVAL;
-       return machine_kexec_get_xen(range);
+    switch (range->range) {
+    case KEXEC_RANGE_MA_XEN:
+        return machine_kexec_get_xen(range);
+    case KEXEC_RANGE_MA_LIVEUPDATE:
+        range->start = lu_bootmem_start;
+        range->size = lu_bootmem_size;
+        return 0;
+    default:
+        return -EINVAL;
+    }
 }
 
 void arch_crash_save_vmcoreinfo(void)
diff --git a/xen/arch/x86/setup.c b/xen/arch/x86/setup.c
index 650d70c1fc..11c1ba8e91 100644
--- a/xen/arch/x86/setup.c
+++ b/xen/arch/x86/setup.c
@@ -678,7 +678,7 @@ static unsigned int __init copy_bios_e820(struct e820entry 
*map, unsigned int li
     return n;
 }
 
-static unsigned long lu_bootmem_start, lu_bootmem_size, lu_data;
+unsigned long lu_bootmem_start, lu_bootmem_size, lu_data;
 
 static int __init parse_liveupdate(const char *str)
 {
diff --git a/xen/include/public/kexec.h b/xen/include/public/kexec.h
index 3f2a118381..298381af8d 100644
--- a/xen/include/public/kexec.h
+++ b/xen/include/public/kexec.h
@@ -150,6 +150,7 @@ typedef struct xen_kexec_load_v1 {
 #define KEXEC_RANGE_MA_EFI_MEMMAP 5 /* machine address and size of
                                      * of the EFI Memory Map */
 #define KEXEC_RANGE_MA_VMCOREINFO 6 /* machine address and size of vmcoreinfo 
*/
+#define KEXEC_RANGE_MA_LIVEUPDATE 7 /* Boot mem for live update */
 
 /*
  * Find the address and size of certain memory areas
-- 
2.21.0


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