s390/kvm/vsie.c

586 	struct page *page;
596 		page = READ_ONCE(kvm->arch.vsie.pages[i]);
597 		if (!page)
599 		cur = page_to_virt(page);
611  * Map the first prefix page and if tx is enabled also the second prefix page.
653  * Pin the guest page given by gpa and set hpa to the pinned host address.
661 	struct page *page;
663 	page = gfn_to_page(kvm, gpa_to_gfn(gpa));
664 	if (is_error_page(page))
666 	*hpa = (hpa_t)page_to_phys(page) + (gpa & ~PAGE_MASK);
670 /* Unpins a page previously pinned via pin_guest_page, marking it as dirty. */
674 	/* mark the page always as dirty for migration */
725  * This works as long as the data lies in one page. If blocks ever exceed one
726  * page, we have to fall back to shadowing.
772 		/* 256 bytes cannot cross page boundaries */
789 		 * 512 bytes vector registers cannot cross page boundaries
807 		/* 64 bytes cannot cross page boundaries */
836 		 * cross page boundaries
1078 	 * Forward the PEI intercept to the guest if it was a page fault, or
1335  * Get or create a vsie page for a scb address.
1337  * Returns: - address of a vsie page (cached or new one)
1344 	struct page *page;
1348 	page = radix_tree_lookup(&kvm->arch.vsie.addr_to_page, addr >> 9);
1350 	if (page) {
1351 		if (page_ref_inc_return(page) == 2)
1352 			return page_to_virt(page);
1353 		page_ref_dec(page);
1364 		page = alloc_page(GFP_KERNEL_ACCOUNT | __GFP_ZERO | GFP_DMA);
1365 		if (!page) {
1369 		page_ref_inc(page);
1370 		kvm->arch.vsie.pages[kvm->arch.vsie.page_count] = page;
1375 			page = kvm->arch.vsie.pages[kvm->arch.vsie.next];
1376 			if (page_ref_inc_return(page) == 2)
1378 			page_ref_dec(page);
1382 		radix_tree_delete(&kvm->arch.vsie.addr_to_page, page->index >> 9);
1384 	page->index = addr;
1386 	if (radix_tree_insert(&kvm->arch.vsie.addr_to_page, addr >> 9, page)) {
1387 		page_ref_dec(page);
1393 	vsie_page = page_to_virt(page);
1401 /* put a vsie page acquired via get_vsie_page */
1404 	struct page *page = pfn_to_page(__pa(vsie_page) >> PAGE_SHIFT);
1406 	page_ref_dec(page);
1473 	struct page *page;
1478 		page = kvm->arch.vsie.pages[i];
1480 		vsie_page = page_to_virt(page);
1483 		radix_tree_delete(&kvm->arch.vsie.addr_to_page, page->index >> 9);
1484 		__free_page(page);