Re: [PATCH 2/8] xen/balloon: Move common memory reservation routines to a module

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On 05/29/2018 09:24 PM, Boris Ostrovsky wrote:
On 05/25/2018 11:33 AM, Oleksandr Andrushchenko wrote:
+
+void xenmem_reservation_va_mapping_update(unsigned long count,
+					  struct page **pages,
+					  xen_pfn_t *frames)
+{
+#ifdef CONFIG_XEN_HAVE_PVMMU
+	int i;
+
+	for (i = 0; i < count; i++) {
+		struct page *page;
+
+		page = pages[i];
+		BUG_ON(page == NULL);
+
+		/*
+		 * We don't support PV MMU when Linux and Xen is using
+		 * different page granularity.
+		 */
+		BUILD_BUG_ON(XEN_PAGE_SIZE != PAGE_SIZE);
+
+		if (!xen_feature(XENFEAT_auto_translated_physmap)) {
+			unsigned long pfn = page_to_pfn(page);
+
+			set_phys_to_machine(pfn, frames[i]);
+
+			/* Link back into the page tables if not highmem. */
+			if (!PageHighMem(page)) {
+				int ret;
+
+				ret = HYPERVISOR_update_va_mapping(
+						(unsigned long)__va(pfn << PAGE_SHIFT),
+						mfn_pte(frames[i], PAGE_KERNEL),
+						0);
+				BUG_ON(ret);
+			}
+		}
+	}
+#endif
+}
+EXPORT_SYMBOL(xenmem_reservation_va_mapping_update);
+
+void xenmem_reservation_va_mapping_reset(unsigned long count,
+					 struct page **pages)
+{
+#ifdef CONFIG_XEN_HAVE_PVMMU
+	int i;
+
+	for (i = 0; i < count; i++) {
+		/*
+		 * We don't support PV MMU when Linux and Xen is using
+		 * different page granularity.
+		 */
+		BUILD_BUG_ON(XEN_PAGE_SIZE != PAGE_SIZE);
+
+		if (!xen_feature(XENFEAT_auto_translated_physmap)) {
+			struct page *page = pages[i];
+			unsigned long pfn = page_to_pfn(page);
+
+			if (!PageHighMem(page)) {
+				int ret;
+
+				ret = HYPERVISOR_update_va_mapping(
+						(unsigned long)__va(pfn << PAGE_SHIFT),
+						__pte_ma(0), 0);
+				BUG_ON(ret);
+			}
+			__set_phys_to_machine(pfn, INVALID_P2M_ENTRY);
+		}
+	}
+#endif
+}
+EXPORT_SYMBOL(xenmem_reservation_va_mapping_reset);
One other thing I noticed --- both of these can be declared as NOPs in
the header file if !CONFIG_XEN_HAVE_PVMMU.
Will rework it to be NOp for !CONFIG_XEN_HAVE_PVMMU
-boris

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