[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
Re: [Xen-devel] [PATCH 2/8] xen/balloon: Move common memory reservation routines to a module
- To: Boris Ostrovsky <boris.ostrovsky@xxxxxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxxx, linux-kernel@xxxxxxxxxxxxxxx, dri-devel@xxxxxxxxxxxxxxxxxxxxx, linux-media@xxxxxxxxxxxxxxx, jgross@xxxxxxxx, konrad.wilk@xxxxxxxxxx
- From: Oleksandr Andrushchenko <andr2000@xxxxxxxxx>
- Date: Tue, 29 May 2018 21:23:21 +0300
- Cc: daniel.vetter@xxxxxxxxx, matthew.d.roper@xxxxxxxxx, dongwon.kim@xxxxxxxxx, Oleksandr Andrushchenko <oleksandr_andrushchenko@xxxxxxxx>
- Delivery-date: Tue, 29 May 2018 18:23:27 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
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
_______________________________________________
Xen-devel mailing list
Xen-devel@xxxxxxxxxxxxxxxxxxxx
https://lists.xenproject.org/mailman/listinfo/xen-devel
|
