- if ((addr >= block->target_start) &&
- (addr + s->dump_info.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;
+ while (1) {
+ if (addr >= block->target_start && addr < block->target_end) {
+ size_t n = MIN(block->target_end - addr, page_size - addr % page_size);
+ hbuf = block->host_addr + (addr - block->target_start);
+ if (!buf) {
+ if (n == page_size) {
+ /* this is a whole target page, go for it */
+ assert(addr % page_size == 0);
+ buf = hbuf;
+ break;
+ } else if (bufptr) {
+ assert(*bufptr);
+ buf = *bufptr;
+ memset(buf, 0, page_size);
+ } else {
+ return true;
+ }
+ }
+
+ memcpy(buf + addr % page_size, hbuf, n);
+ addr += n;
+ if (addr % page_size == 0) {
+ /* we filled up the page */
+ break;
+ }
+ } else {
+ /* the next page is in the next block */
+ *blockptr = block = QTAILQ_NEXT(block, next);
+ if (!block) {
+ break;
+ }
+
+ addr = block->target_start;
+ /* are we still in the same page? */
+ if (dump_paddr_to_pfn(s, addr) != *pfnptr) {
+ if (buf) {
+ /* no, but we already filled something earlier, return it */
+ break;
+ } else {
+ /* else continue from there */
+ *pfnptr = dump_paddr_to_pfn(s, addr);
+ }
+ }