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[RFC,v3,04/22] Add KEXEC_RANGE_MA_LIVEUPDATE

Message ID 20200130161330.2324143-4-dwmw2@infradead.org (mailing list archive)
State New, archived
Headers show
Series Live update: boot memory management, data stream handling, record format | expand

Commit Message

David Woodhouse Jan. 30, 2020, 4:13 p.m. UTC 
From: David Woodhouse <dwmw@amazon.co.uk>

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

Signed-off-by: David Woodhouse <dwmw@amazon.co.uk>
---
 xen/arch/x86/machine_kexec.c | 13 ++++++++++---
 xen/include/public/kexec.h   |  1 +
 2 files changed, 11 insertions(+), 3 deletions(-)
diff mbox series

Patch

diff --git a/xen/arch/x86/machine_kexec.c b/xen/arch/x86/machine_kexec.c
index b70d5a6a86..273bc20664 100644
--- a/xen/arch/x86/machine_kexec.c
+++ b/xen/arch/x86/machine_kexec.c
@@ -186,9 +186,16 @@  void machine_kexec(struct kexec_image *image)
 
 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/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