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authorqiaonuohan <qiaonuohan@cn.fujitsu.com>2014-02-18 14:11:33 +0800
committerLuiz Capitulino <lcapitulino@redhat.com>2014-02-28 11:52:03 -0500
commitd0686c7291fe8f0210e7a666f80892fa71395510 (patch)
tree221b078f6078a989cb0864f356b143d3cb1ceace /dump.c
parent298f116827405f37dde10a2a6cbc75d20f9ba99c (diff)
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dump: add API to write dump_bitmap
functions are used to write 1st and 2nd dump_bitmap of kdump-compressed format, which is used to indicate whether the corresponded page is existed in vmcore. 1st and 2nd dump_bitmap are same, because dump level is specified to 1 here. Signed-off-by: Qiao Nuohan <qiaonuohan@cn.fujitsu.com> Reviewed-by: Laszlo Ersek <lersek@redhat.com> Signed-off-by: Luiz Capitulino <lcapitulino@redhat.com>
Diffstat (limited to 'dump.c')
-rw-r--r--dump.c164
1 files changed, 164 insertions, 0 deletions
diff --git a/dump.c b/dump.c
index 4b2799f..5755534 100644
--- a/dump.c
+++ b/dump.c
@@ -1001,6 +1001,170 @@ static int write_dump_header(DumpState *s)
}
}
+/*
+ * set dump_bitmap sequencely. the bit before last_pfn is not allowed to be
+ * rewritten, so if need to set the first bit, set last_pfn and pfn to 0.
+ * set_dump_bitmap will always leave the recently set bit un-sync. And setting
+ * (last bit + sizeof(buf) * 8) to 0 will do flushing the content in buf into
+ * vmcore, ie. synchronizing un-sync bit into vmcore.
+ */
+static int set_dump_bitmap(uint64_t last_pfn, uint64_t pfn, bool value,
+ uint8_t *buf, DumpState *s)
+{
+ off_t old_offset, new_offset;
+ off_t offset_bitmap1, offset_bitmap2;
+ uint32_t byte, bit;
+
+ /* should not set the previous place */
+ assert(last_pfn <= pfn);
+
+ /*
+ * if the bit needed to be set is not cached in buf, flush the data in buf
+ * to vmcore firstly.
+ * making new_offset be bigger than old_offset can also sync remained data
+ * into vmcore.
+ */
+ old_offset = BUFSIZE_BITMAP * (last_pfn / PFN_BUFBITMAP);
+ new_offset = BUFSIZE_BITMAP * (pfn / PFN_BUFBITMAP);
+
+ while (old_offset < new_offset) {
+ /* calculate the offset and write dump_bitmap */
+ offset_bitmap1 = s->offset_dump_bitmap + old_offset;
+ if (write_buffer(s->fd, offset_bitmap1, buf,
+ BUFSIZE_BITMAP) < 0) {
+ return -1;
+ }
+
+ /* dump level 1 is chosen, so 1st and 2nd bitmap are same */
+ offset_bitmap2 = s->offset_dump_bitmap + s->len_dump_bitmap +
+ old_offset;
+ if (write_buffer(s->fd, offset_bitmap2, buf,
+ BUFSIZE_BITMAP) < 0) {
+ return -1;
+ }
+
+ memset(buf, 0, BUFSIZE_BITMAP);
+ old_offset += BUFSIZE_BITMAP;
+ }
+
+ /* get the exact place of the bit in the buf, and set it */
+ byte = (pfn % PFN_BUFBITMAP) / CHAR_BIT;
+ bit = (pfn % PFN_BUFBITMAP) % CHAR_BIT;
+ if (value) {
+ buf[byte] |= 1u << bit;
+ } else {
+ buf[byte] &= ~(1u << bit);
+ }
+
+ return 0;
+}
+
+/*
+ * exam every page and return the page frame number and the address of the page.
+ * bufptr can be NULL. note: the blocks here is supposed to reflect guest-phys
+ * blocks, so block->target_start and block->target_end should be interal
+ * multiples of the target page size.
+ */
+static bool get_next_page(GuestPhysBlock **blockptr, uint64_t *pfnptr,
+ uint8_t **bufptr, DumpState *s)
+{
+ GuestPhysBlock *block = *blockptr;
+ hwaddr addr;
+ uint8_t *buf;
+
+ /* block == NULL means the start of the iteration */
+ if (!block) {
+ block = QTAILQ_FIRST(&s->guest_phys_blocks.head);
+ *blockptr = block;
+ assert(block->target_start % s->page_size == 0);
+ assert(block->target_end % s->page_size == 0);
+ *pfnptr = paddr_to_pfn(block->target_start, s->page_shift);
+ if (bufptr) {
+ *bufptr = block->host_addr;
+ }
+ return true;
+ }
+
+ *pfnptr = *pfnptr + 1;
+ addr = pfn_to_paddr(*pfnptr, s->page_shift);
+
+ if ((addr >= block->target_start) &&
+ (addr + s->page_size <= block->target_end)) {
+ buf = block->host_addr + (addr - block->target_start);
+ } else {
+ /* the next page is in the next block */
+ block = QTAILQ_NEXT(block, next);
+ *blockptr = block;
+ if (!block) {
+ return false;
+ }
+ assert(block->target_start % s->page_size == 0);
+ assert(block->target_end % s->page_size == 0);
+ *pfnptr = paddr_to_pfn(block->target_start, s->page_shift);
+ buf = block->host_addr;
+ }
+
+ if (bufptr) {
+ *bufptr = buf;
+ }
+
+ return true;
+}
+
+static int write_dump_bitmap(DumpState *s)
+{
+ int ret = 0;
+ uint64_t last_pfn, pfn;
+ void *dump_bitmap_buf;
+ size_t num_dumpable;
+ GuestPhysBlock *block_iter = NULL;
+
+ /* dump_bitmap_buf is used to store dump_bitmap temporarily */
+ dump_bitmap_buf = g_malloc0(BUFSIZE_BITMAP);
+
+ num_dumpable = 0;
+ last_pfn = 0;
+
+ /*
+ * exam memory page by page, and set the bit in dump_bitmap corresponded
+ * to the existing page.
+ */
+ while (get_next_page(&block_iter, &pfn, NULL, s)) {
+ ret = set_dump_bitmap(last_pfn, pfn, true, dump_bitmap_buf, s);
+ if (ret < 0) {
+ dump_error(s, "dump: failed to set dump_bitmap.\n");
+ ret = -1;
+ goto out;
+ }
+
+ last_pfn = pfn;
+ num_dumpable++;
+ }
+
+ /*
+ * set_dump_bitmap will always leave the recently set bit un-sync. Here we
+ * set last_pfn + PFN_BUFBITMAP to 0 and those set but un-sync bit will be
+ * synchronized into vmcore.
+ */
+ if (num_dumpable > 0) {
+ ret = set_dump_bitmap(last_pfn, last_pfn + PFN_BUFBITMAP, false,
+ dump_bitmap_buf, s);
+ if (ret < 0) {
+ dump_error(s, "dump: failed to sync dump_bitmap.\n");
+ ret = -1;
+ goto out;
+ }
+ }
+
+ /* number of dumpable pages that will be dumped later */
+ s->num_dumpable = num_dumpable;
+
+out:
+ g_free(dump_bitmap_buf);
+
+ return ret;
+}
+
static ram_addr_t get_start_block(DumpState *s)
{
GuestPhysBlock *block;