size_t guest_pfns = qemu_ram_pagesize(pss->block) >> TARGET_PAGE_BITS;
pss->host_page_sending = true;
- pss->host_page_start = ROUND_DOWN(pss->page, guest_pfns);
- pss->host_page_end = ROUND_UP(pss->page + 1, guest_pfns);
+ if (guest_pfns <= 1) {
+ /*
+ * This covers both when guest psize == host psize, or when guest
+ * has larger psize than the host (guest_pfns==0).
+ *
+ * For the latter, we always send one whole guest page per
+ * iteration of the host page (example: an Alpha VM on x86 host
+ * will have guest psize 8K while host psize 4K).
+ */
+ pss->host_page_start = pss->page;
+ pss->host_page_end = pss->page + 1;
+ } else {
+ /*
+ * The host page spans over multiple guest pages, we send them
+ * within the same host page iteration.
+ */
+ pss->host_page_start = ROUND_DOWN(pss->page, guest_pfns);
+ pss->host_page_end = ROUND_UP(pss->page + 1, guest_pfns);
+ }
}
/*