From: Penny Zheng <penny.zheng@arm.com>
To: <xen-devel@lists.xenproject.org>, <sstabellini@kernel.org>,
<julien@xen.org>
Cc: <Bertrand.Marquis@arm.com>, <Penny.Zheng@arm.com>,
<Wei.Chen@arm.com>, <nd@arm.com>
Subject: [PATCH V4 05/10] xen/arm: static memory initialization
Date: Wed, 28 Jul 2021 10:27:52 +0000 [thread overview]
Message-ID: <20210728102758.3269446-6-penny.zheng@arm.com> (raw)
In-Reply-To: <20210728102758.3269446-1-penny.zheng@arm.com>
This patch introduces static memory initialization, during system boot up.
The new function init_staticmem_pages is responsible for static memory
initialization.
Helper free_staticmem_pages is the equivalent of free_heap_pages, to free
nr_mfns pages of static memory.
This commit also introduces new CONFIG_STATIC_MEMORY to avoid bringing dead
codes in other archs.
Put asynchronous scrubbing for pages of static memory in TODO list.
Signed-off-by: Penny Zheng <penny.zheng@arm.com>
---
v4 change:
- move the option CONFIG_STATIC_MEMORY to common code, and with Arm
"select"ing it
- replace round_pg{down,up}() with PFN_DOWN()/PFN_UP()
---
xen/arch/arm/Kconfig | 1 +
xen/arch/arm/setup.c | 24 ++++++++++++++++++++++++
xen/common/Kconfig | 3 +++
xen/common/page_alloc.c | 20 ++++++++++++++++++++
xen/include/xen/mm.h | 6 ++++++
5 files changed, 54 insertions(+)
diff --git a/xen/arch/arm/Kconfig b/xen/arch/arm/Kconfig
index ecfa6822e4..cc7a943d27 100644
--- a/xen/arch/arm/Kconfig
+++ b/xen/arch/arm/Kconfig
@@ -15,6 +15,7 @@ config ARM
select HAS_PASSTHROUGH
select HAS_PDX
select IOMMU_FORCE_PT_SHARE
+ select STATIC_MEMORY
config ARCH_DEFCONFIG
string
diff --git a/xen/arch/arm/setup.c b/xen/arch/arm/setup.c
index f569134317..369f6631ee 100644
--- a/xen/arch/arm/setup.c
+++ b/xen/arch/arm/setup.c
@@ -622,6 +622,26 @@ static void __init init_pdx(void)
}
}
+/* Static memory initialization */
+static void __init init_staticmem_pages(void)
+{
+ unsigned int bank;
+
+ /* TODO: Considering NUMA-support scenario. */
+ for ( bank = 0 ; bank < bootinfo.static_mem.nr_banks; bank++ )
+ {
+ unsigned long bank_start = PFN_UP(bootinfo.static_mem.bank[bank].start);
+ unsigned long bank_size = PFN_DOWN(bootinfo.static_mem.bank[bank].size);
+ unsigned long bank_end = bank_start + bank_size;
+
+ if ( bank_end <= bank_start )
+ return;
+
+ free_staticmem_pages(mfn_to_page(_mfn(bank_start)),
+ bank_size, false);
+ }
+}
+
#ifdef CONFIG_ARM_32
static void __init setup_mm(void)
{
@@ -749,6 +769,8 @@ static void __init setup_mm(void)
/* Add xenheap memory that was not already added to the boot allocator. */
init_xenheap_pages(mfn_to_maddr(xenheap_mfn_start),
mfn_to_maddr(xenheap_mfn_end));
+
+ init_staticmem_pages();
}
#else /* CONFIG_ARM_64 */
static void __init setup_mm(void)
@@ -802,6 +824,8 @@ static void __init setup_mm(void)
setup_frametable_mappings(ram_start, ram_end);
max_page = PFN_DOWN(ram_end);
+
+ init_staticmem_pages();
}
#endif
diff --git a/xen/common/Kconfig b/xen/common/Kconfig
index 0ddd18e11a..8f736eea82 100644
--- a/xen/common/Kconfig
+++ b/xen/common/Kconfig
@@ -67,6 +67,9 @@ config MEM_ACCESS
config NEEDS_LIBELF
bool
+config STATIC_MEMORY
+ bool
+
menu "Speculative hardening"
config SPECULATIVE_HARDEN_ARRAY
diff --git a/xen/common/page_alloc.c b/xen/common/page_alloc.c
index a3ee5eca9e..2acb73e323 100644
--- a/xen/common/page_alloc.c
+++ b/xen/common/page_alloc.c
@@ -1519,6 +1519,26 @@ static void free_heap_pages(
spin_unlock(&heap_lock);
}
+#ifdef CONFIG_STATIC_MEMORY
+/* Equivalent of free_heap_pages to free nr_mfns pages of static memory. */
+void __init free_staticmem_pages(struct page_info *pg, unsigned long nr_mfns,
+ bool need_scrub)
+{
+ mfn_t mfn = page_to_mfn(pg);
+ unsigned long i;
+
+ for ( i = 0; i < nr_mfns; i++ )
+ {
+ mark_page_free(&pg[i], mfn_add(mfn, i));
+
+ if ( need_scrub )
+ {
+ /* TODO: asynchronous scrubbing for pages of static memory. */
+ scrub_one_page(pg);
+ }
+ }
+}
+#endif
/*
* Following rules applied for page offline:
diff --git a/xen/include/xen/mm.h b/xen/include/xen/mm.h
index 667f9dac83..8e8fb5a615 100644
--- a/xen/include/xen/mm.h
+++ b/xen/include/xen/mm.h
@@ -85,6 +85,12 @@ bool scrub_free_pages(void);
} while ( false )
#define FREE_XENHEAP_PAGE(p) FREE_XENHEAP_PAGES(p, 0)
+#ifdef CONFIG_STATIC_MEMORY
+/* These functions are for static memory */
+void free_staticmem_pages(struct page_info *pg, unsigned long nr_mfns,
+ bool need_scrub);
+#endif
+
/* Map machine page range in Xen virtual address space. */
int map_pages_to_xen(
unsigned long virt,
--
2.25.1
next prev parent reply other threads:[~2021-07-28 10:29 UTC|newest]
Thread overview: 44+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-07-28 10:27 [PATCH V4 00/10] Domain on Static Allocation Penny Zheng
2021-07-28 10:27 ` [PATCH V4 01/10] xen/arm: introduce domain " Penny Zheng
2021-08-11 13:32 ` Julien Grall
2021-08-16 5:21 ` Penny Zheng
2021-08-16 17:27 ` Julien Grall
2021-08-17 2:28 ` Penny Zheng
2021-07-28 10:27 ` [PATCH V4 02/10] xen/arm: introduce new helper device_tree_get_meminfo Penny Zheng
2021-08-11 13:35 ` Julien Grall
2021-08-16 5:27 ` Penny Zheng
2021-07-28 10:27 ` [PATCH V4 03/10] xen/arm: handle static memory in dt_unreserved_regions Penny Zheng
2021-08-11 13:48 ` Julien Grall
2021-08-16 6:00 ` Penny Zheng
2021-08-16 17:33 ` Julien Grall
2021-07-28 10:27 ` [PATCH V4 04/10] xen: introduce mark_page_free Penny Zheng
2021-08-11 14:08 ` Julien Grall
2021-07-28 10:27 ` Penny Zheng [this message]
2021-08-04 15:54 ` [PATCH V4 05/10] xen/arm: static memory initialization Jan Beulich
2021-08-13 12:20 ` Julien Grall
2021-08-16 6:12 ` Penny Zheng
2021-08-13 12:38 ` Julien Grall
2021-08-16 7:00 ` Wei Chen
2021-07-28 10:27 ` [PATCH V4 06/10] xen/arm: introduce PGC_reserved Penny Zheng
2021-08-13 12:21 ` Julien Grall
2021-08-16 6:13 ` Penny Zheng
2021-07-28 10:27 ` [PATCH V4 07/10] xen: re-define assign_pages and introduce assign_page Penny Zheng
2021-08-05 6:34 ` Jan Beulich
2021-08-13 12:27 ` Julien Grall
2021-08-13 12:32 ` Jan Beulich
2021-08-17 8:21 ` Penny Zheng
2021-07-28 10:27 ` [PATCH V4 08/10] xen/arm: introduce acquire_staticmem_pages and acquire_domstatic_pages Penny Zheng
2021-08-05 6:52 ` Jan Beulich
2021-08-13 13:00 ` Julien Grall
2021-08-16 6:43 ` Penny Zheng
2021-08-16 17:43 ` Julien Grall
2021-08-17 2:33 ` Penny Zheng
2021-07-28 10:27 ` [PATCH V4 09/10] xen/arm: check "xen,static-mem" property during domain construction Penny Zheng
2021-08-13 13:12 ` Julien Grall
2021-08-16 6:53 ` Penny Zheng
2021-07-28 10:27 ` [PATCH V4 10/10] xen/arm: introduce allocate_static_memory Penny Zheng
2021-08-13 13:36 ` Julien Grall
2021-08-16 7:51 ` Penny Zheng
2021-08-16 17:55 ` Julien Grall
2021-08-17 2:36 ` Penny Zheng
2021-07-28 10:27 ` [PATCH V4 04/10] xen: introduce mark_page_free Penny Zheng
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