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Re: [PATCH 5/5] xen/arm: do not give memory back to static heap
Hi Luca,
On 15/11/2024 10:50, Luca Fancellu wrote:
From: Penny Zheng <Penny.Zheng@xxxxxxx>
If Xenheap is statically configured in Device Tree, its size is
definite. So, the memory shall not be given back into static heap, like
it's normally done in free_init_memory, etc, once the initialization
is finished.
Extract static_heap flag from init data bootinfo, as it will be needed
after destroying the init data section.
Introduce a new helper xen_is_using_staticheap() to tell whether Xenheap
is statically configured in the Device Tree.
Signed-off-by: Luca Fancellu <luca.fancellu@xxxxxxx>
Similar to a previous patch, why wre Penny and Wei's Signed-off-by removed?
---
This is a rebase of this one:
https://patchwork.kernel.org/project/xen-devel/patch/20230626033443.2943270-18-Penny.Zheng@xxxxxxx/
---
xen/arch/arm/arm32/mmu/mm.c | 4 ++--
xen/arch/arm/kernel.c | 3 ++-
xen/arch/arm/mmu/setup.c | 8 ++++++--
xen/arch/arm/setup.c | 27 ++++++++++++++-------------
xen/common/device-tree/bootfdt.c | 2 +-
xen/common/device-tree/bootinfo.c | 2 +-
xen/common/device-tree/device-tree.c | 3 +++
xen/include/xen/bootfdt.h | 11 ++++++++++-
8 files changed, 39 insertions(+), 21 deletions(-)
diff --git a/xen/arch/arm/arm32/mmu/mm.c b/xen/arch/arm/arm32/mmu/mm.c
index 063611412be0..b7ca7c94c9ca 100644
--- a/xen/arch/arm/arm32/mmu/mm.c
+++ b/xen/arch/arm/arm32/mmu/mm.c
@@ -199,7 +199,7 @@ void __init setup_mm(void)
total_pages = ram_size >> PAGE_SHIFT;
- if ( bootinfo.static_heap )
+ if ( xen_is_using_staticheap() )
{
const struct membanks *reserved_mem = bootinfo_get_reserved_mem();
@@ -246,7 +246,7 @@ void __init setup_mm(void)
do
{
- e = bootinfo.static_heap ?
+ e = xen_is_using_staticheap() ?
fit_xenheap_in_static_heap(pfn_to_paddr(xenheap_pages), MB(32)) :
consider_modules(ram_start, ram_end,
pfn_to_paddr(xenheap_pages),
diff --git a/xen/arch/arm/kernel.c b/xen/arch/arm/kernel.c
index 293d7efaed9c..a4a99607b668 100644
--- a/xen/arch/arm/kernel.c
+++ b/xen/arch/arm/kernel.c
@@ -247,7 +247,8 @@ static __init int kernel_decompress(struct bootmodule *mod,
uint32_t offset)
* Free the original kernel, update the pointers to the
* decompressed kernel
*/
- fw_unreserved_regions(addr, addr + size, init_domheap_pages, 0);
+ if ( !xen_is_using_staticheap() )
The comment on top needs to be updated.
+ fw_unreserved_regions(addr, addr + size, init_domheap_pages, 0);
return 0;
}
diff --git a/xen/arch/arm/mmu/setup.c b/xen/arch/arm/mmu/setup.c
index 1b1d302c8788..d0775793f4b4 100644
--- a/xen/arch/arm/mmu/setup.c
+++ b/xen/arch/arm/mmu/setup.c
@@ -343,8 +343,12 @@ void free_init_memory(void)
if ( rc )
panic("Unable to remove the init section (rc = %d)\n", rc);
- init_domheap_pages(pa, pa + len);
- printk("Freed %ldkB init memory.\n", (long)(__init_end-__init_begin)>>10);
+ if ( !xen_is_using_staticheap() )
+ {
+ init_domheap_pages(pa, pa + len);
+ printk("Freed %ldkB init memory.\n",
+ (long)(__init_end-__init_begin) >> 10);
+ }
}
/**
diff --git a/xen/arch/arm/setup.c b/xen/arch/arm/setup.c
index 71ebaa77ca94..91340d5dc201 100644
--- a/xen/arch/arm/setup.c
+++ b/xen/arch/arm/setup.c
@@ -206,24 +206,25 @@ void __init discard_initial_modules(void)
struct bootmodules *mi = &bootinfo.modules;
int i;
- for ( i = 0; i < mi->nr_mods; i++ )
+ if ( !xen_is_using_staticheap() )
{
- paddr_t s = mi->module[i].start;
- paddr_t e = s + PAGE_ALIGN(mi->module[i].size);
-
- if ( mi->module[i].kind == BOOTMOD_XEN )
- continue;
+ for ( i = 0; i < mi->nr_mods; i++ )
+ {
+ paddr_t s = mi->module[i].start;
+ paddr_t e = s + PAGE_ALIGN(mi->module[i].size);
- if ( !mfn_valid(maddr_to_mfn(s)) ||
- !mfn_valid(maddr_to_mfn(e)) )
- continue;
+ if ( mi->module[i].kind == BOOTMOD_XEN )
+ continue;
- fw_unreserved_regions(s, e, init_domheap_pages, 0);
- }
+ if ( !mfn_valid(maddr_to_mfn(s)) ||
+ !mfn_valid(maddr_to_mfn(e)) )
+ continue;
- mi->nr_mods = 0;
+ fw_unreserved_regions(s, e, init_domheap_pages, 0);
+ }
- remove_early_mappings();
+ mi->nr_mods = 0;
+ }
}
/* Relocate the FDT in Xen heap */
diff --git a/xen/common/device-tree/bootfdt.c b/xen/common/device-tree/bootfdt.c
index 927f59c64b0d..ccb150b34a63 100644
--- a/xen/common/device-tree/bootfdt.c
+++ b/xen/common/device-tree/bootfdt.c
@@ -403,7 +403,7 @@ static int __init process_chosen_node(const void *fdt, int
node,
if ( rc )
return rc;
- bootinfo.static_heap = true;
+ static_heap = true;
}
printk("Checking for initrd in /chosen\n");
diff --git a/xen/common/device-tree/bootinfo.c
b/xen/common/device-tree/bootinfo.c
index f2e6a1145b7c..1e83d5172938 100644
--- a/xen/common/device-tree/bootinfo.c
+++ b/xen/common/device-tree/bootinfo.c
@@ -386,7 +386,7 @@ void __init populate_boot_allocator(void)
const struct membanks *reserved_mem = bootinfo_get_reserved_mem();
paddr_t s, e;
- if ( bootinfo.static_heap )
+ if ( xen_is_using_staticheap() )
{
for ( i = 0 ; i < reserved_mem->nr_banks; i++ )
{
diff --git a/xen/common/device-tree/device-tree.c
b/xen/common/device-tree/device-tree.c
index d0528c582565..22b69c49171b 100644
--- a/xen/common/device-tree/device-tree.c
+++ b/xen/common/device-tree/device-tree.c
@@ -25,6 +25,9 @@
#include <asm/setup.h>
#include <xen/err.h>
+/* Flag saved when Xen is using the static heap feature (xen,static-heap) */
+bool __read_mostly static_heap;
Strictly speaking, static_heap could be used with ACPI (even though
there is not binding today). So I think it should not belong to
device-tree.c. I think page_alloc.c may be more suitable. Also, I think
static_heap will not be touched after init. So this likely wants to be
__ro_after_init.
Lastly, shouldn't this be protected by #ifdef? Otherwise...
+
const void *device_tree_flattened;
dt_irq_xlate_func dt_irq_xlate;
/* Host device tree */
diff --git a/xen/include/xen/bootfdt.h b/xen/include/xen/bootfdt.h
index 16fa05f38f38..0015a4babde7 100644
--- a/xen/include/xen/bootfdt.h
+++ b/xen/include/xen/bootfdt.h
@@ -132,7 +132,6 @@ struct bootinfo {
#ifdef CONFIG_STATIC_SHM
struct shared_meminfo shmem;
#endif
- bool static_heap;
};
#ifdef CONFIG_ACPI
@@ -156,6 +155,7 @@ struct bootinfo {
}
extern struct bootinfo bootinfo;
+extern bool static_heap;
bool check_reserved_regions_overlap(paddr_t region_start,
paddr_t region_size);
@@ -206,4 +206,13 @@ static inline struct shmem_membank_extra
*bootinfo_get_shmem_extra(void)
}
#endif
+static inline bool xen_is_using_staticheap(void)
... we could have xen_is_using_staticheap() != static_heap.
+{
+#ifdef CONFIG_STATIC_MEMORY
+ return static_heap;
+#else
+ return false;
+#endif
+}
+
#endif /* XEN_BOOTFDT_H */
Cheers,
--
Julien Grall
|
