On 05/30/2018 10:24 PM, Boris Ostrovsky wrote:
On 05/30/2018 01:46 PM, Oleksandr Andrushchenko wrote:
On 05/30/2018 06:54 PM, Boris Ostrovsky wrote:
BTW, I also think you can further simplify
xenmem_reservation_va_mapping_* routines by bailing out right away if
xen_feature(XENFEAT_auto_translated_physmap). In fact, you might even
make them inlines, along the lines of
inline void xenmem_reservation_va_mapping_reset(unsigned long count,
struct page **pages)
{
#ifdef CONFIG_XEN_HAVE_PVMMU
if (!xen_feature(XENFEAT_auto_translated_physmap))
__xenmem_reservation_va_mapping_reset(...)
#endif
}
How about:
#ifdef CONFIG_XEN_HAVE_PVMMU
static inline __xenmem_reservation_va_mapping_reset(struct page *page)
{
[...]
}
#endif
and
void xenmem_reservation_va_mapping_reset(unsigned long count,
struct page **pages)
{
#ifdef CONFIG_XEN_HAVE_PVMMU
if (!xen_feature(XENFEAT_auto_translated_physmap)) {
int i;
for (i = 0; i < count; i++)
__xenmem_reservation_va_mapping_reset(pages[i]);
}
#endif
}
This way I can use __xenmem_reservation_va_mapping_reset(page);
instead of xenmem_reservation_va_mapping_reset(1, &page);
Sure, this also works.
Could you please take look at the patch attached if this is what we want?
-boris
Thank you,
Oleksandr
>From d41751068ac80ca5a375909d6c01cb25716a4975 Mon Sep 17 00:00:00 2001
From: Oleksandr Andrushchenko <oleksandr_andrushchenko@xxxxxxxx>
Date: Wed, 23 May 2018 16:52:45 +0300
Subject: [PATCH] xen/balloon: Share common memory reservation routines
Memory {increase|decrease}_reservation and VA mappings update/reset
code used in balloon driver can be made common, so other drivers can
also re-use the same functionality without open-coding.
Create a dedicated file for the shared code and export corresponding
symbols for other kernel modules.
Signed-off-by: Oleksandr Andrushchenko <oleksandr_andrushchenko@xxxxxxxx>
---
drivers/xen/Makefile | 1 +
drivers/xen/balloon.c | 71 ++-------------------
drivers/xen/mem-reservation.c | 78 +++++++++++++++++++++++
include/xen/mem-reservation.h | 114 ++++++++++++++++++++++++++++++++++
4 files changed, 199 insertions(+), 65 deletions(-)
create mode 100644 drivers/xen/mem-reservation.c
create mode 100644 include/xen/mem-reservation.h
diff --git a/drivers/xen/Makefile b/drivers/xen/Makefile
index 451e833f5931..3c87b0c3aca6 100644
--- a/drivers/xen/Makefile
+++ b/drivers/xen/Makefile
@@ -2,6 +2,7 @@
obj-$(CONFIG_HOTPLUG_CPU) += cpu_hotplug.o
obj-$(CONFIG_X86) += fallback.o
obj-y += grant-table.o features.o balloon.o manage.o preempt.o time.o
+obj-y += mem-reservation.o
obj-y += events/
obj-y += xenbus/
diff --git a/drivers/xen/balloon.c b/drivers/xen/balloon.c
index 065f0b607373..1789be76e9c5 100644
--- a/drivers/xen/balloon.c
+++ b/drivers/xen/balloon.c
@@ -71,6 +71,7 @@
#include <xen/balloon.h>
#include <xen/features.h>
#include <xen/page.h>
+#include <xen/mem-reservation.h>
static int xen_hotplug_unpopulated;
@@ -157,13 +158,6 @@ static DECLARE_DELAYED_WORK(balloon_worker, balloon_process);
#define GFP_BALLOON \
(GFP_HIGHUSER | __GFP_NOWARN | __GFP_NORETRY | __GFP_NOMEMALLOC)
-static void scrub_page(struct page *page)
-{
-#ifdef CONFIG_XEN_SCRUB_PAGES
- clear_highpage(page);
-#endif
-}
-
/* balloon_append: add the given page to the balloon. */
static void __balloon_append(struct page *page)
{
@@ -463,11 +457,6 @@ static enum bp_state increase_reservation(unsigned long nr_pages)
int rc;
unsigned long i;
struct page *page;
- struct xen_memory_reservation reservation = {
- .address_bits = 0,
- .extent_order = EXTENT_ORDER,
- .domid = DOMID_SELF
- };
if (nr_pages > ARRAY_SIZE(frame_list))
nr_pages = ARRAY_SIZE(frame_list);
@@ -486,9 +475,7 @@ static enum bp_state increase_reservation(unsigned long nr_pages)
page = balloon_next_page(page);
}
- set_xen_guest_handle(reservation.extent_start, frame_list);
- reservation.nr_extents = nr_pages;
- rc = HYPERVISOR_memory_op(XENMEM_populate_physmap, &reservation);
+ rc = xenmem_reservation_increase(nr_pages, frame_list);
if (rc <= 0)
return BP_EAGAIN;
@@ -496,29 +483,7 @@ static enum bp_state increase_reservation(unsigned long nr_pages)
page = balloon_retrieve(false);
BUG_ON(page == NULL);
-#ifdef CONFIG_XEN_HAVE_PVMMU
- /*
- * 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, frame_list[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(frame_list[i], PAGE_KERNEL),
- 0);
- BUG_ON(ret);
- }
- }
-#endif
+ __xenmem_reservation_va_mapping_update(page, frame_list[i]);
/* Relinquish the page back to the allocator. */
free_reserved_page(page);
@@ -535,11 +500,6 @@ static enum bp_state decrease_reservation(unsigned long nr_pages, gfp_t gfp)
unsigned long i;
struct page *page, *tmp;
int ret;
- struct xen_memory_reservation reservation = {
- .address_bits = 0,
- .extent_order = EXTENT_ORDER,
- .domid = DOMID_SELF
- };
LIST_HEAD(pages);
if (nr_pages > ARRAY_SIZE(frame_list))
@@ -553,7 +513,7 @@ static enum bp_state decrease_reservation(unsigned long nr_pages, gfp_t gfp)
break;
}
adjust_managed_page_count(page, -1);
- scrub_page(page);
+ xenmem_reservation_scrub_page(page);
list_add(&page->lru, &pages);
}
@@ -575,25 +535,8 @@ static enum bp_state decrease_reservation(unsigned long nr_pages, gfp_t gfp)
/* XENMEM_decrease_reservation requires a GFN */
frame_list[i++] = xen_page_to_gfn(page);
-#ifdef CONFIG_XEN_HAVE_PVMMU
- /*
- * 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);
+ __xenmem_reservation_va_mapping_reset(page);
- if (!PageHighMem(page)) {
- 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
list_del(&page->lru);
balloon_append(page);
@@ -601,9 +544,7 @@ static enum bp_state decrease_reservation(unsigned long nr_pages, gfp_t gfp)
flush_tlb_all();
- set_xen_guest_handle(reservation.extent_start, frame_list);
- reservation.nr_extents = nr_pages;
- ret = HYPERVISOR_memory_op(XENMEM_decrease_reservation, &reservation);
+ ret = xenmem_reservation_decrease(nr_pages, frame_list);
BUG_ON(ret != nr_pages);
balloon_stats.current_pages -= nr_pages;
diff --git a/drivers/xen/mem-reservation.c b/drivers/xen/mem-reservation.c
new file mode 100644
index 000000000000..5347c17a08c1
--- /dev/null
+++ b/drivers/xen/mem-reservation.c
@@ -0,0 +1,78 @@
+// SPDX-License-Identifier: GPL-2.0
+
+/******************************************************************************
+ * Xen memory reservation utilities.
+ *
+ * Copyright (c) 2003, B Dragovic
+ * Copyright (c) 2003-2004, M Williamson, K Fraser
+ * Copyright (c) 2005 Dan M. Smith, IBM Corporation
+ * Copyright (c) 2010 Daniel Kiper
+ * Copyright (c) 2018 Oleksandr Andrushchenko, EPAM Systems Inc.
+ */
+
+#include <xen/mem-reservation.h>
+
+/*
+ * Use one extent per PAGE_SIZE to avoid to break down the page into
+ * multiple frame.
+ */
+#define EXTENT_ORDER (fls(XEN_PFN_PER_PAGE) - 1)
+
+#ifdef CONFIG_XEN_SCRUB_PAGES
+void xenmem_reservation_scrub_page(struct page *page)
+{
+ clear_highpage(page);
+}
+EXPORT_SYMBOL_GPL(xenmem_reservation_scrub_page);
+#endif
+
+#ifdef CONFIG_XEN_HAVE_PVMMU
+void xenmem_reservation_va_mapping_update(unsigned long count,
+ struct page **pages,
+ xen_pfn_t *frames)
+{
+ int i;
+
+ for (i = 0; i < count; i++)
+ __xenmem_reservation_va_mapping_update(pages[i], frames[i]);
+}
+EXPORT_SYMBOL_GPL(xenmem_reservation_va_mapping_update);
+
+void xenmem_reservation_va_mapping_reset(unsigned long count,
+ struct page **pages)
+{
+ int i;
+
+ for (i = 0; i < count; i++)
+ __xenmem_reservation_va_mapping_reset(pages[i]);
+}
+EXPORT_SYMBOL_GPL(xenmem_reservation_va_mapping_reset);
+#endif /* CONFIG_XEN_HAVE_PVMMU */
+
+int xenmem_reservation_increase(int count, xen_pfn_t *frames)
+{
+ struct xen_memory_reservation reservation = {
+ .address_bits = 0,
+ .extent_order = EXTENT_ORDER,
+ .domid = DOMID_SELF
+ };
+
+ set_xen_guest_handle(reservation.extent_start, frames);
+ reservation.nr_extents = count;
+ return HYPERVISOR_memory_op(XENMEM_populate_physmap, &reservation);
+}
+EXPORT_SYMBOL_GPL(xenmem_reservation_increase);
+
+int xenmem_reservation_decrease(int count, xen_pfn_t *frames)
+{
+ struct xen_memory_reservation reservation = {
+ .address_bits = 0,
+ .extent_order = EXTENT_ORDER,
+ .domid = DOMID_SELF
+ };
+
+ set_xen_guest_handle(reservation.extent_start, frames);
+ reservation.nr_extents = count;
+ return HYPERVISOR_memory_op(XENMEM_decrease_reservation, &reservation);
+}
+EXPORT_SYMBOL_GPL(xenmem_reservation_decrease);
diff --git a/include/xen/mem-reservation.h b/include/xen/mem-reservation.h
new file mode 100644
index 000000000000..d44443cdd60e
--- /dev/null
+++ b/include/xen/mem-reservation.h
@@ -0,0 +1,114 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+
+/*
+ * Xen memory reservation utilities.
+ *
+ * Copyright (c) 2003, B Dragovic
+ * Copyright (c) 2003-2004, M Williamson, K Fraser
+ * Copyright (c) 2005 Dan M. Smith, IBM Corporation
+ * Copyright (c) 2010 Daniel Kiper
+ * Copyright (c) 2018 Oleksandr Andrushchenko, EPAM Systems Inc.
+ */
+
+#ifndef _XENMEM_RESERVATION_H
+#define _XENMEM_RESERVATION_H
+
+#include <linux/kernel.h>
+#include <linux/slab.h>
+
+#include <asm/xen/hypercall.h>
+#include <asm/tlb.h>
+
+#include <xen/interface/memory.h>
+#include <xen/page.h>
+
+#ifdef CONFIG_XEN_SCRUB_PAGES
+void xenmem_reservation_scrub_page(struct page *page);
+#else
+static inline void xenmem_reservation_scrub_page(struct page *page)
+{
+}
+#endif
+
+static inline void
+__xenmem_reservation_va_mapping_update(struct page *page, xen_pfn_t frame)
+{
+#ifdef CONFIG_XEN_HAVE_PVMMU
+ 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, frame);
+
+ /* 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(frame, PAGE_KERNEL),
+ 0);
+ BUG_ON(ret);
+ }
+ }
+#endif
+}
+
+static inline void
+__xenmem_reservation_va_mapping_reset(struct page *page)
+{
+#ifdef CONFIG_XEN_HAVE_PVMMU
+ /*
+ * 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);
+
+ 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
+}
+
+#ifdef CONFIG_XEN_HAVE_PVMMU
+void xenmem_reservation_va_mapping_update(unsigned long count,
+ struct page **pages,
+ xen_pfn_t *frames);
+
+void xenmem_reservation_va_mapping_reset(unsigned long count,
+ struct page **pages);
+#else
+static inline void xenmem_reservation_va_mapping_update(unsigned long count,
+ struct page **pages,
+ xen_pfn_t *frames)
+{
+}
+
+static inline void xenmem_reservation_va_mapping_reset(unsigned long count,
+ struct page **pages)
+{
+}
+#endif
+
+int xenmem_reservation_increase(int count, xen_pfn_t *frames);
+
+int xenmem_reservation_decrease(int count, xen_pfn_t *frames);
+
+#endif
--
2.17.0
