dump: add members to DumpState and init some of them

add some members to DumpState that will be used in writing vmcore in
kdump-compressed format. some of them, like page_size, will be initialized
in the patch.

Signed-off-by: Qiao Nuohan <qiaonuohan@cn.fujitsu.com>
Reviewed-by: Laszlo Ersek <lersek@redhat.com>
Signed-off-by: Luiz Capitulino <lcapitulino@redhat.com>

2 files changed, 35 insertions, 0 deletions

diff --git a/dump.c b/dump.c
index 2b940bddcd..3a1944e381 100644
--- a/dump.c
+++ b/dump.c
@@ -79,6 +79,16 @@ typedef struct DumpState {
 
     uint8_t *note_buf;          /* buffer for notes */
     size_t note_buf_offset;     /* the writing place in note_buf */
+    uint32_t nr_cpus;           /* number of guest's cpu */
+    size_t page_size;           /* guest's page size */
+    uint32_t page_shift;        /* guest's page shift */
+    uint64_t max_mapnr;         /* the biggest guest's phys-mem's number */
+    size_t len_dump_bitmap;     /* the size of the place used to store
+                                   dump_bitmap in vmcore */
+    off_t offset_dump_bitmap;   /* offset of dump_bitmap part in vmcore */
+    off_t offset_page;          /* offset of page part in vmcore */
+    size_t num_dumpable;        /* number of page that can be dumped */
+    uint32_t flag_compress;     /* indicate the compression format */
 } DumpState;
 
 static int dump_cleanup(DumpState *s)
@@ -796,6 +806,14 @@ static ram_addr_t get_start_block(DumpState *s)
     return -1;
 }
 
+static void get_max_mapnr(DumpState *s)
+{
+    GuestPhysBlock *last_block;
+
+    last_block = QTAILQ_LAST(&s->guest_phys_blocks.head, GuestPhysBlockHead);
+    s->max_mapnr = paddr_to_pfn(last_block->target_end, s->page_shift);
+}
+
 static int dump_init(DumpState *s, int fd, bool paging, bool has_filter,
                      int64_t begin, int64_t length, Error **errp)
 {
@@ -864,6 +882,16 @@ static int dump_init(DumpState *s, int fd, bool paging, bool has_filter,
         qemu_get_guest_simple_memory_mapping(&s->list, &s->guest_phys_blocks);
     }
 
+    s->nr_cpus = nr_cpus;
+    s->page_size = TARGET_PAGE_SIZE;
+    s->page_shift = ffs(s->page_size) - 1;
+
+    get_max_mapnr(s);
+
+    uint64_t tmp;
+    tmp = DIV_ROUND_UP(DIV_ROUND_UP(s->max_mapnr, CHAR_BIT), s->page_size);
+    s->len_dump_bitmap = tmp * s->page_size;
+
     if (s->has_filter) {
         memory_mapping_filter(&s->list, s->begin, s->length);
     }
diff --git a/include/sysemu/dump.h b/include/sysemu/dump.h
index b32b390805..995bf47003 100644
--- a/include/sysemu/dump.h
+++ b/include/sysemu/dump.h
@@ -20,6 +20,13 @@
 #define VERSION_FLAT_HEADER         (1)    /* version of flattened format */
 #define END_FLAG_FLAT_HEADER        (-1)
 
+#define ARCH_PFN_OFFSET             (0)
+
+#define paddr_to_pfn(X, page_shift) \
+    (((unsigned long long)(X) >> (page_shift)) - ARCH_PFN_OFFSET)
+#define pfn_to_paddr(X, page_shift) \
+    (((unsigned long long)(X) + ARCH_PFN_OFFSET) << (page_shift))
+
 typedef struct ArchDumpInfo {
     int d_machine;  /* Architecture */
     int d_endian;   /* ELFDATA2LSB or ELFDATA2MSB */