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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [xen staging] xen/device-tree: Allow region overlapping with /memreserve/ ranges
commit a14593e3995afc74bf4efe91116e34894e0ea49a
Author: Luca Fancellu <luca.fancellu@xxxxxxx>
AuthorDate: Thu Nov 14 10:28:02 2024 +0000
Commit: Julien Grall <jgrall@xxxxxxxxxx>
CommitDate: Thu Nov 28 18:57:21 2024 +0000
xen/device-tree: Allow region overlapping with /memreserve/ ranges
There are some cases where the device tree exposes a memory range
in both /memreserve/ and reserved-memory node, in this case the
current code will stop Xen to boot since it will find that the
latter range is clashing with the already recorded /memreserve/
ranges.
Furthermore, u-boot lists boot modules ranges, such as ramdisk,
in the /memreserve/ part and even in this case this will prevent
Xen to boot since it will see that the module memory range that
it is going to add in 'add_boot_module' clashes with a /memreserve/
range.
When Xen populate the data structure that tracks the memory ranges,
it also adds a memory type described in 'enum membank_type', so
in order to fix this behavior, allow overlapping with the /memreserve/
ranges in the 'check_reserved_regions_overlap' function when a flag
is set.
In order to implement this solution, there is a distinction between
the 'struct membanks *' handled by meminfo_overlap_check(...) that
needs to be done, because the static shared memory banks doesn't have
a usable bank[].type field and so it can't be accessed, hence now
the 'struct membanks_hdr' have a 'enum region_type type' field in order
to be able to identify static shared memory banks in
meminfo_overlap_check(...).
While there, set a type for the memory recorded using meminfo_add_bank()
from efi-boot.h.
Fixes: 53dc37829c31 ("xen/arm: Add DT reserve map regions to
bootinfo.reserved_mem")
Reported-by: Shawn Anastasio <sanastasio@xxxxxxxxxxxxxxxxxxxxx>
Reported-by: Grygorii Strashko <grygorii_strashko@xxxxxxxx>
Signed-off-by: Luca Fancellu <luca.fancellu@xxxxxxx>
Tested-by: Grygorii Strashko <grygorii_strashko@xxxxxxxx>
Reviewed-by: Julien Grall <jgrall@xxxxxxxxxx>
---
xen/arch/arm/efi/efi-boot.h | 3 ++-
xen/arch/arm/static-shmem.c | 2 +-
xen/common/device-tree/bootfdt.c | 9 ++++++++-
xen/common/device-tree/bootinfo.c | 39 +++++++++++++++++++++++++++++----------
xen/include/xen/bootfdt.h | 20 +++++++++++++++++---
5 files changed, 57 insertions(+), 16 deletions(-)
diff --git a/xen/arch/arm/efi/efi-boot.h b/xen/arch/arm/efi/efi-boot.h
index 199f526022..a80a5a7ab3 100644
--- a/xen/arch/arm/efi/efi-boot.h
+++ b/xen/arch/arm/efi/efi-boot.h
@@ -167,13 +167,14 @@ static bool __init meminfo_add_bank(struct membanks *mem,
if ( mem->nr_banks >= mem->max_banks )
return false;
#ifdef CONFIG_ACPI
- if ( check_reserved_regions_overlap(start, size) )
+ if ( check_reserved_regions_overlap(start, size, false) )
return false;
#endif
bank = &mem->bank[mem->nr_banks];
bank->start = start;
bank->size = size;
+ bank->type = MEMBANK_DEFAULT;
mem->nr_banks++;
diff --git a/xen/arch/arm/static-shmem.c b/xen/arch/arm/static-shmem.c
index aa80756c3c..66088a4267 100644
--- a/xen/arch/arm/static-shmem.c
+++ b/xen/arch/arm/static-shmem.c
@@ -696,7 +696,7 @@ int __init process_shm_node(const void *fdt, int node,
uint32_t address_cells,
if (i < mem->max_banks)
{
if ( (paddr != INVALID_PADDR) &&
- check_reserved_regions_overlap(paddr, size) )
+ check_reserved_regions_overlap(paddr, size, false) )
return -EINVAL;
/* Static shared memory shall be reserved from any other use. */
diff --git a/xen/common/device-tree/bootfdt.c b/xen/common/device-tree/bootfdt.c
index 480644b4b4..fc93d86e82 100644
--- a/xen/common/device-tree/bootfdt.c
+++ b/xen/common/device-tree/bootfdt.c
@@ -176,8 +176,15 @@ static int __init device_tree_get_meminfo(const void *fdt,
int node,
for ( i = 0; i < banks && mem->nr_banks < mem->max_banks; i++ )
{
device_tree_get_reg(&cell, address_cells, size_cells, &start, &size);
+ /*
+ * Some valid device trees, such as those generated by OpenPOWER
+ * skiboot firmware, expose all reserved memory regions in the
+ * FDT memory reservation block AND in the reserved-memory node which
+ * has already been parsed. Thus, any matching overlaps in the
+ * reserved_mem banks should be ignored.
+ */
if ( mem == bootinfo_get_reserved_mem() &&
- check_reserved_regions_overlap(start, size) )
+ check_reserved_regions_overlap(start, size, true) )
return -EINVAL;
/* Some DT may describe empty bank, ignore them */
if ( !size )
diff --git a/xen/common/device-tree/bootinfo.c
b/xen/common/device-tree/bootinfo.c
index 3738eb57ff..0daf5e941a 100644
--- a/xen/common/device-tree/bootinfo.c
+++ b/xen/common/device-tree/bootinfo.c
@@ -101,7 +101,8 @@ static void __init dt_unreserved_regions(paddr_t s, paddr_t
e,
*/
static bool __init meminfo_overlap_check(const struct membanks *mem,
paddr_t region_start,
- paddr_t region_size)
+ paddr_t region_size,
+ bool allow_memreserve_overlap)
{
paddr_t bank_start = INVALID_PADDR, bank_end = 0;
paddr_t region_end = region_start + region_size;
@@ -115,12 +116,23 @@ static bool __init meminfo_overlap_check(const struct
membanks *mem,
if ( INVALID_PADDR == bank_start || region_end <= bank_start ||
region_start >= bank_end )
continue;
- else
- {
- printk("Region: [%#"PRIpaddr", %#"PRIpaddr") overlapping with
bank[%u]: [%#"PRIpaddr", %#"PRIpaddr")\n",
- region_start, region_end, i, bank_start, bank_end);
- return true;
- }
+
+ /*
+ * If allow_memreserve_overlap is set, this check allows a region to be
+ * included in a MEMBANK_FDT_RESVMEM bank, but struct membanks *mem of
+ * type STATIC_SHARED_MEMORY don't set the bank[].type field because
+ * that is declared in a union with a field that is instead used,
+ * in any case this restriction is ok since STATIC_SHARED_MEMORY banks
+ * are not meant to clash with FDT /memreserve/ ranges.
+ */
+ if ( allow_memreserve_overlap && mem->type != STATIC_SHARED_MEMORY &&
+ region_start >= bank_start && region_end <= bank_end &&
+ mem->bank[i].type == MEMBANK_FDT_RESVMEM )
+ continue;
+
+ printk("Region: [%#"PRIpaddr", %#"PRIpaddr") overlapping with
bank[%u]: [%#"PRIpaddr", %#"PRIpaddr")\n",
+ region_start, region_end, i, bank_start, bank_end);
+ return true;
}
return false;
@@ -173,7 +185,8 @@ void __init fw_unreserved_regions(paddr_t s, paddr_t e,
* existing reserved memory regions, otherwise false.
*/
bool __init check_reserved_regions_overlap(paddr_t region_start,
- paddr_t region_size)
+ paddr_t region_size,
+ bool allow_memreserve_overlap)
{
const struct membanks *mem_banks[] = {
bootinfo_get_reserved_mem(),
@@ -192,7 +205,8 @@ bool __init check_reserved_regions_overlap(paddr_t
region_start,
* shared memory banks (when static shared memory feature is enabled)
*/
for ( i = 0; i < ARRAY_SIZE(mem_banks); i++ )
- if ( meminfo_overlap_check(mem_banks[i], region_start, region_size) )
+ if ( meminfo_overlap_check(mem_banks[i], region_start, region_size,
+ allow_memreserve_overlap) )
return true;
/* Check if input region is overlapping with bootmodules */
@@ -218,7 +232,12 @@ struct bootmodule __init *add_boot_module(bootmodule_kind
kind,
return NULL;
}
- if ( check_reserved_regions_overlap(start, size) )
+ /*
+ * u-boot adds boot module such as ramdisk to the /memreserve/, since these
+ * ranges are saved in reserved_mem at this stage, allow an eventual exact
+ * match with MEMBANK_FDT_RESVMEM banks.
+ */
+ if ( check_reserved_regions_overlap(start, size, true) )
return NULL;
for ( i = 0 ; i < mods->nr_mods ; i++ )
diff --git a/xen/include/xen/bootfdt.h b/xen/include/xen/bootfdt.h
index 16fa05f38f..cea40ee117 100644
--- a/xen/include/xen/bootfdt.h
+++ b/xen/include/xen/bootfdt.h
@@ -48,6 +48,12 @@ enum membank_type {
MEMBANK_FDT_RESVMEM,
};
+enum region_type {
+ MEMORY,
+ RESERVED_MEMORY,
+ STATIC_SHARED_MEMORY
+};
+
/* Indicates the maximum number of characters(\0 included) for shm_id */
#define MAX_SHM_ID_LENGTH 16
@@ -71,6 +77,7 @@ struct membanks {
__struct_group(membanks_hdr, common, ,
unsigned int nr_banks;
unsigned int max_banks;
+ enum region_type type;
);
struct membank bank[];
};
@@ -136,13 +143,17 @@ struct bootinfo {
};
#ifdef CONFIG_ACPI
-#define BOOTINFO_ACPI_INIT .acpi.common.max_banks = NR_MEM_BANKS,
+#define BOOTINFO_ACPI_INIT \
+ .acpi.common.max_banks = NR_MEM_BANKS, \
+ .acpi.common.type = MEMORY
#else
#define BOOTINFO_ACPI_INIT
#endif
#ifdef CONFIG_STATIC_SHM
-#define BOOTINFO_SHMEM_INIT .shmem.common.max_banks = NR_SHMEM_BANKS,
+#define BOOTINFO_SHMEM_INIT \
+ .shmem.common.max_banks = NR_SHMEM_BANKS, \
+ .shmem.common.type = STATIC_SHARED_MEMORY
#else
#define BOOTINFO_SHMEM_INIT
#endif
@@ -150,7 +161,9 @@ struct bootinfo {
#define BOOTINFO_INIT \
{ \
.mem.common.max_banks = NR_MEM_BANKS, \
+ .mem.common.type = MEMORY, \
.reserved_mem.common.max_banks = NR_MEM_BANKS, \
+ .reserved_mem.common.type = RESERVED_MEMORY, \
BOOTINFO_ACPI_INIT \
BOOTINFO_SHMEM_INIT \
}
@@ -158,7 +171,8 @@ struct bootinfo {
extern struct bootinfo bootinfo;
bool check_reserved_regions_overlap(paddr_t region_start,
- paddr_t region_size);
+ paddr_t region_size,
+ bool allow_memreserve_overlap);
struct bootmodule *add_boot_module(bootmodule_kind kind,
paddr_t start, paddr_t size, bool domU);
--
generated by git-patchbot for /home/xen/git/xen.git#staging
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