Re: [PATCH v3 3/9] xen/balloon: Share common memory reservation routines
On 06/13/2018 03:03 PM, Oleksandr Andrushchenko wrote:
On 06/13/2018 03:02 PM, Boris Ostrovsky wrote:
On 06/13/2018 02:26 AM, Oleksandr Andrushchenko wrote:
On 06/13/2018 03:47 AM, Boris Ostrovsky wrote:
On 06/12/2018 09:41 AM, Oleksandr Andrushchenko wrote:
From: Oleksandr Andrushchenko
diff --git a/include/xen/mem-reservation.h
b/include/xen/mem-reservation.h
new file mode 100644
index ..e0939387278d
--- /dev/null
+++ b/include/xen/mem-reservation.h
@@ -0,0 +1,64 @@
+/* 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
+#include
+
+#include
+#include
+
+#include
+#include
I should have noticed this in the previous post but I suspect most
of these includes belong in the C file. For example, there is no
reason for hypercall.h here.
Yes, it seems that the header can only have
#include
Will move the rest into the .c file
You may need something for clear_highpage() and maybe for Xen feature
flags. But you'll find out for sure when you try to build. ;-)
#include
Or even
#include
according to [1]
;)
-boris
-boris
+
+static inline void xenmem_reservation_scrub_page(struct page *page)
+{
+#ifdef CONFIG_XEN_SCRUB_PAGES
+ clear_highpage(page);
+#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);
+#endif
+
+static inline void xenmem_reservation_va_mapping_update(unsigned
long count,
+ struct page **pages,
+ xen_pfn_t *frames)
+{
+#ifdef CONFIG_XEN_HAVE_PVMMU
+ if (!xen_feature(XENFEAT_auto_translated_physmap))
+ __xenmem_reservation_va_mapping_update(count, pages,
frames);
+#endif
+}
+
+static 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(count, pages);
+#endif
+}
+
+int xenmem_reservation_increase(int count, xen_pfn_t *frames);
+
+int xenmem_reservation_decrease(int count, xen_pfn_t *frames);
+
+#endif
[1] https://elixir.bootlin.com/linux/v4.17.1/ident/clear_highpage
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Re: [PATCH v3 3/9] xen/balloon: Share common memory reservation routines
On 06/13/2018 03:02 PM, Boris Ostrovsky wrote:
On 06/13/2018 02:26 AM, Oleksandr Andrushchenko wrote:
On 06/13/2018 03:47 AM, Boris Ostrovsky wrote:
On 06/12/2018 09:41 AM, Oleksandr Andrushchenko wrote:
From: Oleksandr Andrushchenko
diff --git a/include/xen/mem-reservation.h
b/include/xen/mem-reservation.h
new file mode 100644
index ..e0939387278d
--- /dev/null
+++ b/include/xen/mem-reservation.h
@@ -0,0 +1,64 @@
+/* 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
+#include
+
+#include
+#include
+
+#include
+#include
I should have noticed this in the previous post but I suspect most
of these includes belong in the C file. For example, there is no
reason for hypercall.h here.
Yes, it seems that the header can only have
#include
Will move the rest into the .c file
You may need something for clear_highpage() and maybe for Xen feature
flags. But you'll find out for sure when you try to build. ;-)
#include
;)
-boris
-boris
+
+static inline void xenmem_reservation_scrub_page(struct page *page)
+{
+#ifdef CONFIG_XEN_SCRUB_PAGES
+ clear_highpage(page);
+#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);
+#endif
+
+static inline void xenmem_reservation_va_mapping_update(unsigned
long count,
+ struct page **pages,
+ xen_pfn_t *frames)
+{
+#ifdef CONFIG_XEN_HAVE_PVMMU
+ if (!xen_feature(XENFEAT_auto_translated_physmap))
+ __xenmem_reservation_va_mapping_update(count, pages, frames);
+#endif
+}
+
+static 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(count, pages);
+#endif
+}
+
+int xenmem_reservation_increase(int count, xen_pfn_t *frames);
+
+int xenmem_reservation_decrease(int count, xen_pfn_t *frames);
+
+#endif
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Re: [PATCH v3 3/9] xen/balloon: Share common memory reservation routines
On 06/13/2018 02:26 AM, Oleksandr Andrushchenko wrote:
On 06/13/2018 03:47 AM, Boris Ostrovsky wrote:
On 06/12/2018 09:41 AM, Oleksandr Andrushchenko wrote:
From: Oleksandr Andrushchenko
diff --git a/include/xen/mem-reservation.h
b/include/xen/mem-reservation.h
new file mode 100644
index ..e0939387278d
--- /dev/null
+++ b/include/xen/mem-reservation.h
@@ -0,0 +1,64 @@
+/* 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
+#include
+
+#include
+#include
+
+#include
+#include
I should have noticed this in the previous post but I suspect most of
these includes belong in the C file. For example, there is no reason
for hypercall.h here.
Yes, it seems that the header can only have
#include
Will move the rest into the .c file
You may need something for clear_highpage() and maybe for Xen feature
flags. But you'll find out for sure when you try to build. ;-)
-boris
-boris
+
+static inline void xenmem_reservation_scrub_page(struct page *page)
+{
+#ifdef CONFIG_XEN_SCRUB_PAGES
+ clear_highpage(page);
+#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);
+#endif
+
+static inline void xenmem_reservation_va_mapping_update(unsigned
long count,
+ struct page **pages,
+ xen_pfn_t *frames)
+{
+#ifdef CONFIG_XEN_HAVE_PVMMU
+ if (!xen_feature(XENFEAT_auto_translated_physmap))
+ __xenmem_reservation_va_mapping_update(count, pages, frames);
+#endif
+}
+
+static 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(count, pages);
+#endif
+}
+
+int xenmem_reservation_increase(int count, xen_pfn_t *frames);
+
+int xenmem_reservation_decrease(int count, xen_pfn_t *frames);
+
+#endif
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Re: [PATCH v3 3/9] xen/balloon: Share common memory reservation routines
On 06/12/2018 09:41 AM, Oleksandr Andrushchenko wrote:
From: Oleksandr Andrushchenko
diff --git a/include/xen/mem-reservation.h b/include/xen/mem-reservation.h
new file mode 100644
index ..e0939387278d
--- /dev/null
+++ b/include/xen/mem-reservation.h
@@ -0,0 +1,64 @@
+/* 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
+#include
+
+#include
+#include
+
+#include
+#include
I should have noticed this in the previous post but I suspect most of
these includes belong in the C file. For example, there is no reason for
hypercall.h here.
-boris
+
+static inline void xenmem_reservation_scrub_page(struct page *page)
+{
+#ifdef CONFIG_XEN_SCRUB_PAGES
+ clear_highpage(page);
+#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);
+#endif
+
+static inline void xenmem_reservation_va_mapping_update(unsigned long count,
+ struct page **pages,
+ xen_pfn_t *frames)
+{
+#ifdef CONFIG_XEN_HAVE_PVMMU
+ if (!xen_feature(XENFEAT_auto_translated_physmap))
+ __xenmem_reservation_va_mapping_update(count, pages, frames);
+#endif
+}
+
+static 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(count, pages);
+#endif
+}
+
+int xenmem_reservation_increase(int count, xen_pfn_t *frames);
+
+int xenmem_reservation_decrease(int count, xen_pfn_t *frames);
+
+#endif
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Re: [PATCH v3 3/9] xen/balloon: Share common memory reservation routines
On 06/12/2018 09:41 AM, Oleksandr Andrushchenko wrote:
One more thing: please add a comment here saying that frames array is
array of PFNs (in Xen granularity), which is what
XENMEM_populate_physmap requires. And remove (or update to name the
actual call you are making) the corresponding comment in
increase_reservation().
+
+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, );
+}
+EXPORT_SYMBOL_GPL(xenmem_reservation_increase);
And similarly, here we are requesting GFNs, and update
decrease_reservation().
-boris
+
+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, );
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Re: [PATCH v3 3/9] xen/balloon: Share common memory reservation routines
On 06/13/2018 03:47 AM, Boris Ostrovsky wrote:
On 06/12/2018 09:41 AM, Oleksandr Andrushchenko wrote:
From: Oleksandr Andrushchenko
diff --git a/include/xen/mem-reservation.h
b/include/xen/mem-reservation.h
new file mode 100644
index ..e0939387278d
--- /dev/null
+++ b/include/xen/mem-reservation.h
@@ -0,0 +1,64 @@
+/* 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
+#include
+
+#include
+#include
+
+#include
+#include
I should have noticed this in the previous post but I suspect most of
these includes belong in the C file. For example, there is no reason
for hypercall.h here.
Yes, it seems that the header can only have
#include
Will move the rest into the .c file
-boris
+
+static inline void xenmem_reservation_scrub_page(struct page *page)
+{
+#ifdef CONFIG_XEN_SCRUB_PAGES
+ clear_highpage(page);
+#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);
+#endif
+
+static inline void xenmem_reservation_va_mapping_update(unsigned
long count,
+ struct page **pages,
+ xen_pfn_t *frames)
+{
+#ifdef CONFIG_XEN_HAVE_PVMMU
+ if (!xen_feature(XENFEAT_auto_translated_physmap))
+ __xenmem_reservation_va_mapping_update(count, pages, frames);
+#endif
+}
+
+static 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(count, pages);
+#endif
+}
+
+int xenmem_reservation_increase(int count, xen_pfn_t *frames);
+
+int xenmem_reservation_decrease(int count, xen_pfn_t *frames);
+
+#endif
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Re: [PATCH v3 3/9] xen/balloon: Share common memory reservation routines
On 06/13/2018 04:07 AM, Boris Ostrovsky wrote:
On 06/12/2018 09:41 AM, Oleksandr Andrushchenko wrote:
One more thing: please add a comment here saying that frames array is
array of PFNs (in Xen granularity), which is what
XENMEM_populate_physmap requires. And remove (or update to name the
actual call you are making) the corresponding comment in
increase_reservation().
I will remove corresponding comments from the balloon's
{increase|decrease}_reservation
and move those into xenmem_reservation{increase|decrease} where they
belong now.
I will also put a comment close to xenmem_reservation{increase|decrease}:
/* @frames is an array of PFNs */
int xenmem_reservation_increase(int count, xen_pfn_t *frames)
{
[...]
}
/* @frames is an array of GFNs */
int xenmem_reservation_decrease(int count, xen_pfn_t *frames)
{
[...]
}
+
+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, );
+}
+EXPORT_SYMBOL_GPL(xenmem_reservation_increase);
And similarly, here we are requesting GFNs, and update
decrease_reservation().
Please see above
-boris
Thank you,
Oleksandr
+
+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,
);
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[PATCH v3 3/9] xen/balloon: Share common memory reservation routines
From: Oleksandr Andrushchenko
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
---
drivers/xen/Makefile | 1 +
drivers/xen/balloon.c | 71 ++---
drivers/xen/mem-reservation.c | 112 ++
include/xen/mem-reservation.h | 64 +++
4 files changed, 183 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..bdbce4257b65 100644
--- a/drivers/xen/balloon.c
+++ b/drivers/xen/balloon.c
@@ -71,6 +71,7 @@
#include
#include
#include
+#include
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, );
+ 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(1, , _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(>lru, );
}
@@ -575,25 +535,8 @@ static enum bp_state decrease_reservation(unsigned long
nr_pages, gfp_t gfp)
/*
