* [PATCH 00/11] Static shared memory followup v2 - pt1
@ 2024-03-12 13:03 Luca Fancellu
2024-03-12 13:03 ` [PATCH 01/11] xen/arm: remove stale addr_cells/size_cells in assign_shared_memory Luca Fancellu
` (10 more replies)
0 siblings, 11 replies; 32+ messages in thread
From: Luca Fancellu @ 2024-03-12 13:03 UTC (permalink / raw)
To: xen-devel
Cc: Stefano Stabellini, Julien Grall, Bertrand Marquis, Michal Orzel,
Volodymyr Babchuk
This serie is a partial rework of this other serie:
https://patchwork.kernel.org/project/xen-devel/cover/20231206090623.1932275-1-Penny.Zheng@arm.com/
The original serie is addressing an issue of the static shared memory feature
that impacts the memory footprint of other component when the feature is
enabled, another issue impacts the device tree generation for the guests when
the feature is enabled and used and the last one is a missing feature that is
the option to have a static shared memory region that is not from the host
address space.
This serie is handling some comment on the original serie and it is splitting
the rework in two part, this first part is addressing the memory footprint issue
and the device tree generation, there will be a following serie addressing the
last missing feature soon.
Luca Fancellu (7):
xen/arm: Introduce a generic way to access memory bank structures
xen/arm: Conditional compilation of kernel_info.shm_mem member
xen/arm: Introduce helper for static memory pages
xen/arm: Avoid code duplication in find_unallocated_memory
xen/arm: Avoid code duplication in check_reserved_regions_overlap
xen/arm: Reduce struct membank size on static shared memory
xen/arm: List static shared memory regions as /memory nodes
Penny Zheng (4):
xen/arm: remove stale addr_cells/size_cells in assign_shared_memory
xen/arm: avoid repetitive checking in process_shm_node
xen/arm: remove shm holes for extended regions
xen/arm: fix duplicate /reserved-memory node in Dom0
xen/arch/arm/acpi/domain_build.c | 6 +-
xen/arch/arm/arm32/mmu/mm.c | 68 ++++--
xen/arch/arm/arm64/mmu/mm.c | 4 +-
xen/arch/arm/bootfdt.c | 28 +--
xen/arch/arm/dom0less-build.c | 24 +-
xen/arch/arm/domain_build.c | 187 +++++++++-------
xen/arch/arm/efi/efi-boot.h | 8 +-
xen/arch/arm/efi/efi-dom0.c | 13 +-
xen/arch/arm/include/asm/domain_build.h | 4 +-
xen/arch/arm/include/asm/kernel.h | 19 +-
xen/arch/arm/include/asm/setup.h | 81 ++++++-
xen/arch/arm/include/asm/static-memory.h | 12 +
xen/arch/arm/include/asm/static-shmem.h | 49 +++-
xen/arch/arm/kernel.c | 12 +-
xen/arch/arm/setup.c | 97 +++++---
xen/arch/arm/static-memory.c | 35 ++-
xen/arch/arm/static-shmem.c | 270 +++++++++++++++++------
17 files changed, 634 insertions(+), 283 deletions(-)
--
2.34.1
^ permalink raw reply [flat|nested] 32+ messages in thread
* [PATCH 01/11] xen/arm: remove stale addr_cells/size_cells in assign_shared_memory
2024-03-12 13:03 [PATCH 00/11] Static shared memory followup v2 - pt1 Luca Fancellu
@ 2024-03-12 13:03 ` Luca Fancellu
2024-03-12 13:03 ` [PATCH 02/11] xen/arm: avoid repetitive checking in process_shm_node Luca Fancellu
` (9 subsequent siblings)
10 siblings, 0 replies; 32+ messages in thread
From: Luca Fancellu @ 2024-03-12 13:03 UTC (permalink / raw)
To: xen-devel
Cc: Penny Zheng, Stefano Stabellini, Julien Grall, Bertrand Marquis,
Michal Orzel, Volodymyr Babchuk, Penny Zheng
From: Penny Zheng <Penny.Zheng@arm.com>
Function parameters {addr_cells,size_cells} are stale parameters in
assign_shared_memory, so we shall remove them.
Signed-off-by: Penny Zheng <penny.zheng@arm.com>
Signed-off-by: Luca Fancellu <luca.fancellu@arm.com>
Reviewed-by: Michal Orzel <michal.orzel@amd.com>
---
v1:
- This is this patch: https://patchwork.kernel.org/project/xen-devel/patch/20231206090623.1932275-2-Penny.Zheng@arm.com/
---
xen/arch/arm/static-shmem.c | 2 --
1 file changed, 2 deletions(-)
diff --git a/xen/arch/arm/static-shmem.c b/xen/arch/arm/static-shmem.c
index 9097bc8b1511..cb268cd2edf1 100644
--- a/xen/arch/arm/static-shmem.c
+++ b/xen/arch/arm/static-shmem.c
@@ -90,7 +90,6 @@ static mfn_t __init acquire_shared_memory_bank(struct domain *d,
}
static int __init assign_shared_memory(struct domain *d,
- uint32_t addr_cells, uint32_t size_cells,
paddr_t pbase, paddr_t psize,
paddr_t gbase)
{
@@ -252,7 +251,6 @@ int __init process_shm(struct domain *d, struct kernel_info *kinfo,
* specified, so they should be assigned to dom_io.
*/
ret = assign_shared_memory(owner_dom_io ? dom_io : d,
- addr_cells, size_cells,
pbase, psize, gbase);
if ( ret )
return ret;
--
2.34.1
^ permalink raw reply related [flat|nested] 32+ messages in thread
* [PATCH 02/11] xen/arm: avoid repetitive checking in process_shm_node
2024-03-12 13:03 [PATCH 00/11] Static shared memory followup v2 - pt1 Luca Fancellu
2024-03-12 13:03 ` [PATCH 01/11] xen/arm: remove stale addr_cells/size_cells in assign_shared_memory Luca Fancellu
@ 2024-03-12 13:03 ` Luca Fancellu
2024-03-19 10:57 ` Michal Orzel
2024-03-12 13:03 ` [PATCH 03/11] xen/arm: Introduce a generic way to access memory bank structures Luca Fancellu
` (8 subsequent siblings)
10 siblings, 1 reply; 32+ messages in thread
From: Luca Fancellu @ 2024-03-12 13:03 UTC (permalink / raw)
To: xen-devel
Cc: Penny Zheng, Stefano Stabellini, Julien Grall, Bertrand Marquis,
Michal Orzel, Volodymyr Babchuk, Penny Zheng
From: Penny Zheng <Penny.Zheng@arm.com>
Putting overlap and overflow checking in the loop is causing repetitive
operation, so this commit extracts both checking outside the loop.
Signed-off-by: Penny Zheng <penny.zheng@arm.com>
Signed-off-by: Luca Fancellu <luca.fancellu@arm.com>
---
v1:
- Rework of https://patchwork.kernel.org/project/xen-devel/patch/20231206090623.1932275-3-Penny.Zheng@arm.com/
- use strncmp to match the branch above
- drop Michal R-by given the change
---
xen/arch/arm/static-shmem.c | 39 +++++++++++++++----------------------
1 file changed, 16 insertions(+), 23 deletions(-)
diff --git a/xen/arch/arm/static-shmem.c b/xen/arch/arm/static-shmem.c
index cb268cd2edf1..40a0e860c79d 100644
--- a/xen/arch/arm/static-shmem.c
+++ b/xen/arch/arm/static-shmem.c
@@ -349,7 +349,7 @@ int __init process_shm_node(const void *fdt, int node, uint32_t address_cells,
{
const struct fdt_property *prop, *prop_id, *prop_role;
const __be32 *cell;
- paddr_t paddr, gaddr, size;
+ paddr_t paddr, gaddr, size, end;
struct meminfo *mem = &bootinfo.reserved_mem;
unsigned int i;
int len;
@@ -422,6 +422,13 @@ int __init process_shm_node(const void *fdt, int node, uint32_t address_cells,
return -EINVAL;
}
+ end = paddr + size;
+ if ( end <= paddr )
+ {
+ printk("fdt: static shared memory region %s overflow\n", shm_id);
+ return -EINVAL;
+ }
+
for ( i = 0; i < mem->nr_banks; i++ )
{
/*
@@ -441,30 +448,13 @@ int __init process_shm_node(const void *fdt, int node, uint32_t address_cells,
return -EINVAL;
}
}
+ else if ( strncmp(shm_id, mem->bank[i].shm_id, MAX_SHM_ID_LENGTH) != 0 )
+ continue;
else
{
- paddr_t end = paddr + size;
- paddr_t bank_end = mem->bank[i].start + mem->bank[i].size;
-
- if ( (end <= paddr) || (bank_end <= mem->bank[i].start) )
- {
- printk("fdt: static shared memory region %s overflow\n", shm_id);
- return -EINVAL;
- }
-
- if ( check_reserved_regions_overlap(paddr, size) )
- return -EINVAL;
- else
- {
- if ( strcmp(shm_id, mem->bank[i].shm_id) != 0 )
- continue;
- else
- {
- printk("fdt: different shared memory region could not share the same shm ID %s\n",
- shm_id);
- return -EINVAL;
- }
- }
+ printk("fdt: different shared memory region could not share the same shm ID %s\n",
+ shm_id);
+ return -EINVAL;
}
}
@@ -472,6 +462,9 @@ int __init process_shm_node(const void *fdt, int node, uint32_t address_cells,
{
if ( i < NR_MEM_BANKS )
{
+ if ( check_reserved_regions_overlap(paddr, size) )
+ return -EINVAL;
+
/* Static shared memory shall be reserved from any other use. */
safe_strcpy(mem->bank[mem->nr_banks].shm_id, shm_id);
mem->bank[mem->nr_banks].start = paddr;
--
2.34.1
^ permalink raw reply related [flat|nested] 32+ messages in thread
* [PATCH 03/11] xen/arm: Introduce a generic way to access memory bank structures
2024-03-12 13:03 [PATCH 00/11] Static shared memory followup v2 - pt1 Luca Fancellu
2024-03-12 13:03 ` [PATCH 01/11] xen/arm: remove stale addr_cells/size_cells in assign_shared_memory Luca Fancellu
2024-03-12 13:03 ` [PATCH 02/11] xen/arm: avoid repetitive checking in process_shm_node Luca Fancellu
@ 2024-03-12 13:03 ` Luca Fancellu
2024-03-19 13:10 ` Michal Orzel
2024-03-12 13:03 ` [PATCH 04/11] xen/arm: Conditional compilation of kernel_info.shm_mem member Luca Fancellu
` (7 subsequent siblings)
10 siblings, 1 reply; 32+ messages in thread
From: Luca Fancellu @ 2024-03-12 13:03 UTC (permalink / raw)
To: xen-devel
Cc: Stefano Stabellini, Julien Grall, Bertrand Marquis, Michal Orzel,
Volodymyr Babchuk
Currently the 'stuct meminfo' is defining a static defined array of
'struct membank' of NR_MEM_BANKS elements, some feature like
shared memory don't require such amount of memory allocation but
might want to reuse existing code to manipulate this kind of
structure that is just as 'struct meminfo' but less bulky.
For this reason introduce a generic way to access this kind of
structure using a new stucture 'struct membanks', which implements
all the fields needed by a structure related to memory banks
without the need to specify at build time the size of the
'struct membank' array.
Modify 'struct meminfo' to implement the field related to the new
introduced structure, given the change all usage of this structure
are updated in this way:
- code accessing bootinfo.{mem,reserved_mem,acpi} field now uses
3 new introduced static inline helpers to access the new field
of 'struct meminfo' named 'common'.
- code accessing 'struct kernel_info *' member 'mem' now use the
new introduced macro 'kernel_info_get_mem(...)' to access the
new field of 'struct meminfo' named 'common'.
Constify pointers where needed.
Suggested-by: Julien Grall <julien@xen.org>
Signed-off-by: Luca Fancellu <luca.fancellu@arm.com>
---
xen/arch/arm/acpi/domain_build.c | 6 +-
xen/arch/arm/arm32/mmu/mm.c | 44 +++++-----
xen/arch/arm/arm64/mmu/mm.c | 2 +-
xen/arch/arm/bootfdt.c | 27 +++---
xen/arch/arm/dom0less-build.c | 18 ++--
xen/arch/arm/domain_build.c | 106 +++++++++++++-----------
xen/arch/arm/efi/efi-boot.h | 8 +-
xen/arch/arm/efi/efi-dom0.c | 13 +--
xen/arch/arm/include/asm/domain_build.h | 2 +-
xen/arch/arm/include/asm/kernel.h | 9 ++
xen/arch/arm/include/asm/setup.h | 40 ++++++++-
xen/arch/arm/include/asm/static-shmem.h | 4 +-
xen/arch/arm/kernel.c | 12 +--
xen/arch/arm/setup.c | 58 +++++++------
xen/arch/arm/static-memory.c | 27 +++---
xen/arch/arm/static-shmem.c | 34 ++++----
16 files changed, 243 insertions(+), 167 deletions(-)
diff --git a/xen/arch/arm/acpi/domain_build.c b/xen/arch/arm/acpi/domain_build.c
index b58389ce9e9f..ed895dd8f926 100644
--- a/xen/arch/arm/acpi/domain_build.c
+++ b/xen/arch/arm/acpi/domain_build.c
@@ -444,14 +444,14 @@ static int __init acpi_create_fadt(struct domain *d, struct membank tbl_add[])
}
static int __init estimate_acpi_efi_size(struct domain *d,
- struct kernel_info *kinfo)
+ const struct kernel_info *kinfo)
{
size_t efi_size, acpi_size, madt_size;
u64 addr;
struct acpi_table_rsdp *rsdp_tbl;
struct acpi_table_header *table;
- efi_size = estimate_efi_size(kinfo->mem.nr_banks);
+ efi_size = estimate_efi_size(kernel_info_get_mem(kinfo)->nr_banks);
acpi_size = ROUNDUP(sizeof(struct acpi_table_fadt), 8);
acpi_size += ROUNDUP(sizeof(struct acpi_table_stao), 8);
@@ -546,7 +546,7 @@ int __init prepare_acpi(struct domain *d, struct kernel_info *kinfo)
acpi_map_other_tables(d);
acpi_create_efi_system_table(d, tbl_add);
- acpi_create_efi_mmap_table(d, &kinfo->mem, tbl_add);
+ acpi_create_efi_mmap_table(d, kernel_info_get_mem(kinfo), tbl_add);
/* Map the EFI and ACPI tables to Dom0 */
rc = map_regions_p2mt(d,
diff --git a/xen/arch/arm/arm32/mmu/mm.c b/xen/arch/arm/arm32/mmu/mm.c
index cb441ca87c0d..e6bb5d934c16 100644
--- a/xen/arch/arm/arm32/mmu/mm.c
+++ b/xen/arch/arm/arm32/mmu/mm.c
@@ -41,6 +41,7 @@ static paddr_t __init consider_modules(paddr_t s, paddr_t e,
uint32_t size, paddr_t align,
int first_mod)
{
+ const struct membanks *reserved_mem = bootinfo_get_reserved_mem();
const struct bootmodules *mi = &bootinfo.modules;
int i;
int nr;
@@ -99,15 +100,14 @@ static paddr_t __init consider_modules(paddr_t s, paddr_t e,
* possible kinds of bootmodules.
*
* When retrieving the corresponding reserved-memory addresses, we
- * need to index the bootinfo.reserved_mem bank starting from 0, and
- * only counting the reserved-memory modules. Hence, we need to use
- * i - nr.
+ * need to index the reserved_mem bank starting from 0, and only counting
+ * the reserved-memory modules. Hence, we need to use i - nr.
*/
nr += mi->nr_mods;
- for ( ; i - nr < bootinfo.reserved_mem.nr_banks; i++ )
+ for ( ; i - nr < reserved_mem->nr_banks; i++ )
{
- paddr_t r_s = bootinfo.reserved_mem.bank[i - nr].start;
- paddr_t r_e = r_s + bootinfo.reserved_mem.bank[i - nr].size;
+ paddr_t r_s = reserved_mem->bank[i - nr].start;
+ paddr_t r_e = r_s + reserved_mem->bank[i - nr].size;
if ( s < r_e && r_s < e )
{
@@ -128,17 +128,18 @@ static paddr_t __init consider_modules(paddr_t s, paddr_t e,
*/
static paddr_t __init fit_xenheap_in_static_heap(uint32_t size, paddr_t align)
{
+ const struct membanks *reserved_mem = bootinfo_get_reserved_mem();
unsigned int i;
paddr_t end = 0, aligned_start, aligned_end;
paddr_t bank_start, bank_size, bank_end;
- for ( i = 0 ; i < bootinfo.reserved_mem.nr_banks; i++ )
+ for ( i = 0 ; i < reserved_mem->nr_banks; i++ )
{
- if ( bootinfo.reserved_mem.bank[i].type != MEMBANK_STATIC_HEAP )
+ if ( reserved_mem->bank[i].type != MEMBANK_STATIC_HEAP )
continue;
- bank_start = bootinfo.reserved_mem.bank[i].start;
- bank_size = bootinfo.reserved_mem.bank[i].size;
+ bank_start = reserved_mem->bank[i].start;
+ bank_size = reserved_mem->bank[i].size;
bank_end = bank_start + bank_size;
if ( bank_size < size )
@@ -161,13 +162,14 @@ static paddr_t __init fit_xenheap_in_static_heap(uint32_t size, paddr_t align)
void __init setup_mm(void)
{
+ const struct membanks *mem = bootinfo_get_mem();
paddr_t ram_start, ram_end, ram_size, e, bank_start, bank_end, bank_size;
paddr_t static_heap_end = 0, static_heap_size = 0;
unsigned long heap_pages, xenheap_pages, domheap_pages;
unsigned int i;
const uint32_t ctr = READ_CP32(CTR);
- if ( !bootinfo.mem.nr_banks )
+ if ( !mem->nr_banks )
panic("No memory bank\n");
/* We only supports instruction caches implementing the IVIPT extension. */
@@ -176,14 +178,14 @@ void __init setup_mm(void)
init_pdx();
- ram_start = bootinfo.mem.bank[0].start;
- ram_size = bootinfo.mem.bank[0].size;
+ ram_start = mem->bank[0].start;
+ ram_size = mem->bank[0].size;
ram_end = ram_start + ram_size;
- for ( i = 1; i < bootinfo.mem.nr_banks; i++ )
+ for ( i = 1; i < mem->nr_banks; i++ )
{
- bank_start = bootinfo.mem.bank[i].start;
- bank_size = bootinfo.mem.bank[i].size;
+ bank_start = mem->bank[i].start;
+ bank_size = mem->bank[i].size;
bank_end = bank_start + bank_size;
ram_size = ram_size + bank_size;
@@ -195,13 +197,15 @@ void __init setup_mm(void)
if ( bootinfo.static_heap )
{
- for ( i = 0 ; i < bootinfo.reserved_mem.nr_banks; i++ )
+ const struct membanks *reserved_mem = bootinfo_get_reserved_mem();
+
+ for ( i = 0 ; i < reserved_mem->nr_banks; i++ )
{
- if ( bootinfo.reserved_mem.bank[i].type != MEMBANK_STATIC_HEAP )
+ if ( reserved_mem->bank[i].type != MEMBANK_STATIC_HEAP )
continue;
- bank_start = bootinfo.reserved_mem.bank[i].start;
- bank_size = bootinfo.reserved_mem.bank[i].size;
+ bank_start = reserved_mem->bank[i].start;
+ bank_size = reserved_mem->bank[i].size;
bank_end = bank_start + bank_size;
static_heap_size += bank_size;
diff --git a/xen/arch/arm/arm64/mmu/mm.c b/xen/arch/arm/arm64/mmu/mm.c
index d2651c948698..f8aaf4ac18be 100644
--- a/xen/arch/arm/arm64/mmu/mm.c
+++ b/xen/arch/arm/arm64/mmu/mm.c
@@ -194,7 +194,7 @@ static void __init setup_directmap_mappings(unsigned long base_mfn,
void __init setup_mm(void)
{
- const struct meminfo *banks = &bootinfo.mem;
+ const struct membanks *banks = bootinfo_get_mem();
paddr_t ram_start = INVALID_PADDR;
paddr_t ram_end = 0;
paddr_t ram_size = 0;
diff --git a/xen/arch/arm/bootfdt.c b/xen/arch/arm/bootfdt.c
index 35dbdf3384cb..ecbc80d6a112 100644
--- a/xen/arch/arm/bootfdt.c
+++ b/xen/arch/arm/bootfdt.c
@@ -107,14 +107,14 @@ void __init device_tree_get_reg(const __be32 **cell, uint32_t address_cells,
static int __init device_tree_get_meminfo(const void *fdt, int node,
const char *prop_name,
u32 address_cells, u32 size_cells,
- void *data, enum membank_type type)
+ struct membanks *mem,
+ enum membank_type type)
{
const struct fdt_property *prop;
unsigned int i, banks;
const __be32 *cell;
u32 reg_cells = address_cells + size_cells;
paddr_t start, size;
- struct meminfo *mem = data;
if ( !device_tree_node_is_available(fdt, node) )
return 0;
@@ -133,10 +133,10 @@ static int __init device_tree_get_meminfo(const void *fdt, int node,
cell = (const __be32 *)prop->data;
banks = fdt32_to_cpu(prop->len) / (reg_cells * sizeof (u32));
- for ( i = 0; i < banks && mem->nr_banks < NR_MEM_BANKS; i++ )
+ for ( i = 0; i < banks && mem->nr_banks < mem->max_banks; i++ )
{
device_tree_get_reg(&cell, address_cells, size_cells, &start, &size);
- if ( mem == &bootinfo.reserved_mem &&
+ if ( mem == bootinfo_get_reserved_mem() &&
check_reserved_regions_overlap(start, size) )
return -EINVAL;
/* Some DT may describe empty bank, ignore them */
@@ -231,10 +231,10 @@ int __init device_tree_for_each_node(const void *fdt, int node,
static int __init process_memory_node(const void *fdt, int node,
const char *name, int depth,
u32 address_cells, u32 size_cells,
- void *data)
+ struct membanks *mem)
{
return device_tree_get_meminfo(fdt, node, "reg", address_cells, size_cells,
- data, MEMBANK_DEFAULT);
+ mem, MEMBANK_DEFAULT);
}
static int __init process_reserved_memory_node(const void *fdt, int node,
@@ -259,7 +259,7 @@ static int __init process_reserved_memory(const void *fdt, int node,
{
return device_tree_for_each_node(fdt, node,
process_reserved_memory_node,
- &bootinfo.reserved_mem);
+ bootinfo_get_reserved_mem());
}
static void __init process_multiboot_node(const void *fdt, int node,
@@ -358,7 +358,7 @@ static int __init process_chosen_node(const void *fdt, int node,
rc = device_tree_get_meminfo(fdt, node, "xen,static-heap",
address_cells, size_cells,
- &bootinfo.reserved_mem,
+ bootinfo_get_reserved_mem(),
MEMBANK_STATIC_HEAP);
if ( rc )
return rc;
@@ -420,7 +420,7 @@ static int __init process_domain_node(const void *fdt, int node,
return 0;
return device_tree_get_meminfo(fdt, node, "xen,static-mem", address_cells,
- size_cells, &bootinfo.reserved_mem,
+ size_cells, bootinfo_get_reserved_mem(),
MEMBANK_STATIC_DOMAIN);
}
@@ -438,7 +438,7 @@ static int __init early_scan_node(const void *fdt,
if ( !efi_enabled(EFI_BOOT) &&
device_tree_node_matches(fdt, node, "memory") )
rc = process_memory_node(fdt, node, name, depth,
- address_cells, size_cells, &bootinfo.mem);
+ address_cells, size_cells, bootinfo_get_mem());
else if ( depth == 1 && !dt_node_cmp(name, "reserved-memory") )
rc = process_reserved_memory(fdt, node, name, depth,
address_cells, size_cells);
@@ -459,8 +459,8 @@ static int __init early_scan_node(const void *fdt,
static void __init early_print_info(void)
{
- struct meminfo *mi = &bootinfo.mem;
- struct meminfo *mem_resv = &bootinfo.reserved_mem;
+ const struct membanks *mi = bootinfo_get_mem();
+ const struct membanks *mem_resv = bootinfo_get_reserved_mem();
struct bootmodules *mods = &bootinfo.modules;
struct bootcmdlines *cmds = &bootinfo.cmdlines;
unsigned int i, j;
@@ -537,6 +537,7 @@ static void __init swap_memory_node(void *_a, void *_b, size_t size)
*/
size_t __init boot_fdt_info(const void *fdt, paddr_t paddr)
{
+ struct membanks *mem = bootinfo_get_mem();
int ret;
ret = fdt_check_header(fdt);
@@ -554,7 +555,7 @@ size_t __init boot_fdt_info(const void *fdt, paddr_t paddr)
* bank in memory first. There is no requirement that the DT will provide
* the banks sorted in ascending order. So sort them through.
*/
- sort(bootinfo.mem.bank, bootinfo.mem.nr_banks, sizeof(struct membank),
+ sort(mem->bank, mem->nr_banks, sizeof(struct membank),
cmp_memory_node, swap_memory_node);
early_print_info();
diff --git a/xen/arch/arm/dom0less-build.c b/xen/arch/arm/dom0less-build.c
index fb63ec6fd111..0165da6f2986 100644
--- a/xen/arch/arm/dom0less-build.c
+++ b/xen/arch/arm/dom0less-build.c
@@ -50,6 +50,7 @@ bool __init is_dom0less_mode(void)
static void __init allocate_memory(struct domain *d, struct kernel_info *kinfo)
{
+ struct membanks *mem = kernel_info_get_mem(kinfo);
unsigned int i;
paddr_t bank_size;
@@ -57,7 +58,7 @@ static void __init allocate_memory(struct domain *d, struct kernel_info *kinfo)
/* Don't want format this as PRIpaddr (16 digit hex) */
(unsigned long)(kinfo->unassigned_mem >> 20), d);
- kinfo->mem.nr_banks = 0;
+ mem->nr_banks = 0;
bank_size = MIN(GUEST_RAM0_SIZE, kinfo->unassigned_mem);
if ( !allocate_bank_memory(d, kinfo, gaddr_to_gfn(GUEST_RAM0_BASE),
bank_size) )
@@ -71,15 +72,15 @@ static void __init allocate_memory(struct domain *d, struct kernel_info *kinfo)
if ( kinfo->unassigned_mem )
goto fail;
- for( i = 0; i < kinfo->mem.nr_banks; i++ )
+ for( i = 0; i < mem->nr_banks; i++ )
{
printk(XENLOG_INFO "%pd BANK[%d] %#"PRIpaddr"-%#"PRIpaddr" (%ldMB)\n",
d,
i,
- kinfo->mem.bank[i].start,
- kinfo->mem.bank[i].start + kinfo->mem.bank[i].size,
+ mem->bank[i].start,
+ mem->bank[i].start + mem->bank[i].size,
/* Don't want format this as PRIpaddr (16 digit hex) */
- (unsigned long)(kinfo->mem.bank[i].size >> 20));
+ (unsigned long)(mem->bank[i].size >> 20));
}
return;
@@ -641,12 +642,13 @@ static int __init prepare_dtb_domU(struct domain *d, struct kernel_info *kinfo)
if ( ret )
goto err;
- ret = make_memory_node(d, kinfo->fdt, addrcells, sizecells, &kinfo->mem);
+ ret = make_memory_node(d, kinfo->fdt, addrcells, sizecells,
+ kernel_info_get_mem(kinfo));
if ( ret )
goto err;
ret = make_resv_memory_node(d, kinfo->fdt, addrcells, sizecells,
- &kinfo->shm_mem);
+ &kinfo->shm_mem.common);
if ( ret )
goto err;
@@ -741,7 +743,7 @@ static int __init alloc_xenstore_evtchn(struct domain *d)
static int __init construct_domU(struct domain *d,
const struct dt_device_node *node)
{
- struct kernel_info kinfo = {};
+ struct kernel_info kinfo = KERNEL_INFO_INIT;
const char *dom0less_enhanced;
int rc;
u64 mem;
diff --git a/xen/arch/arm/domain_build.c b/xen/arch/arm/domain_build.c
index 085d88671ebc..62fcdfbdaff2 100644
--- a/xen/arch/arm/domain_build.c
+++ b/xen/arch/arm/domain_build.c
@@ -142,6 +142,7 @@ static bool __init insert_11_bank(struct domain *d,
struct page_info *pg,
unsigned int order)
{
+ struct membanks *mem = kernel_info_get_mem(kinfo);
unsigned int i;
int res;
mfn_t smfn;
@@ -158,9 +159,9 @@ static bool __init insert_11_bank(struct domain *d,
(unsigned long)(kinfo->unassigned_mem >> 20),
order);
- if ( kinfo->mem.nr_banks > 0 &&
+ if ( mem->nr_banks > 0 &&
size < MB(128) &&
- start + size < kinfo->mem.bank[0].start )
+ start + size < mem->bank[0].start )
{
D11PRINT("Allocation below bank 0 is too small, not using\n");
goto fail;
@@ -172,17 +173,17 @@ static bool __init insert_11_bank(struct domain *d,
kinfo->unassigned_mem -= size;
- if ( kinfo->mem.nr_banks == 0 )
+ if ( mem->nr_banks == 0 )
{
- kinfo->mem.bank[0].start = start;
- kinfo->mem.bank[0].size = size;
- kinfo->mem.nr_banks = 1;
+ mem->bank[0].start = start;
+ mem->bank[0].size = size;
+ mem->nr_banks = 1;
return true;
}
- for( i = 0; i < kinfo->mem.nr_banks; i++ )
+ for( i = 0; i < mem->nr_banks; i++ )
{
- struct membank *bank = &kinfo->mem.bank[i];
+ struct membank *bank = &mem->bank[i];
/* If possible merge new memory into the start of the bank */
if ( bank->start == start+size )
@@ -205,24 +206,24 @@ static bool __init insert_11_bank(struct domain *d,
* could have inserted the memory into/before we would already
* have done so, so this must be the right place.
*/
- if ( start + size < bank->start && kinfo->mem.nr_banks < NR_MEM_BANKS )
+ if ( start + size < bank->start && mem->nr_banks < mem->max_banks )
{
memmove(bank + 1, bank,
- sizeof(*bank) * (kinfo->mem.nr_banks - i));
- kinfo->mem.nr_banks++;
+ sizeof(*bank) * (mem->nr_banks - i));
+ mem->nr_banks++;
bank->start = start;
bank->size = size;
return true;
}
}
- if ( i == kinfo->mem.nr_banks && kinfo->mem.nr_banks < NR_MEM_BANKS )
+ if ( i == mem->nr_banks && mem->nr_banks < mem->max_banks )
{
- struct membank *bank = &kinfo->mem.bank[kinfo->mem.nr_banks];
+ struct membank *bank = &mem->bank[mem->nr_banks];
bank->start = start;
bank->size = size;
- kinfo->mem.nr_banks++;
+ mem->nr_banks++;
return true;
}
@@ -294,6 +295,7 @@ static void __init allocate_memory_11(struct domain *d,
const unsigned int min_low_order =
get_order_from_bytes(min_t(paddr_t, dom0_mem, MB(128)));
const unsigned int min_order = get_order_from_bytes(MB(4));
+ struct membanks *mem = kernel_info_get_mem(kinfo);
struct page_info *pg;
unsigned int order = get_allocation_size(kinfo->unassigned_mem);
unsigned int i;
@@ -312,7 +314,7 @@ static void __init allocate_memory_11(struct domain *d,
/* Don't want format this as PRIpaddr (16 digit hex) */
(unsigned long)(kinfo->unassigned_mem >> 20));
- kinfo->mem.nr_banks = 0;
+ mem->nr_banks = 0;
/*
* First try and allocate the largest thing we can as low as
@@ -350,7 +352,7 @@ static void __init allocate_memory_11(struct domain *d,
* continue allocating from above the lowmem and fill in banks.
*/
order = get_allocation_size(kinfo->unassigned_mem);
- while ( kinfo->unassigned_mem && kinfo->mem.nr_banks < NR_MEM_BANKS )
+ while ( kinfo->unassigned_mem && mem->nr_banks < mem->max_banks )
{
pg = alloc_domheap_pages(d, order,
lowmem ? MEMF_bits(lowmem_bitsize) : 0);
@@ -374,7 +376,7 @@ static void __init allocate_memory_11(struct domain *d,
if ( !insert_11_bank(d, kinfo, pg, order) )
{
- if ( kinfo->mem.nr_banks == NR_MEM_BANKS )
+ if ( mem->nr_banks == mem->max_banks )
/* Nothing more we can do. */
break;
@@ -404,14 +406,14 @@ static void __init allocate_memory_11(struct domain *d,
panic("Failed to allocate requested dom0 memory. %ldMB unallocated\n",
(unsigned long)kinfo->unassigned_mem >> 20);
- for( i = 0; i < kinfo->mem.nr_banks; i++ )
+ for( i = 0; i < mem->nr_banks; i++ )
{
printk("BANK[%d] %#"PRIpaddr"-%#"PRIpaddr" (%ldMB)\n",
i,
- kinfo->mem.bank[i].start,
- kinfo->mem.bank[i].start + kinfo->mem.bank[i].size,
+ mem->bank[i].start,
+ mem->bank[i].start + mem->bank[i].size,
/* Don't want format this as PRIpaddr (16 digit hex) */
- (unsigned long)(kinfo->mem.bank[i].size >> 20));
+ (unsigned long)(mem->bank[i].size >> 20));
}
}
@@ -419,6 +421,7 @@ static void __init allocate_memory_11(struct domain *d,
bool __init allocate_bank_memory(struct domain *d, struct kernel_info *kinfo,
gfn_t sgfn, paddr_t tot_size)
{
+ struct membanks *mem = kernel_info_get_mem(kinfo);
int res;
struct page_info *pg;
struct membank *bank;
@@ -432,7 +435,7 @@ bool __init allocate_bank_memory(struct domain *d, struct kernel_info *kinfo,
if ( tot_size == 0 )
return true;
- bank = &kinfo->mem.bank[kinfo->mem.nr_banks];
+ bank = &mem->bank[mem->nr_banks];
bank->start = gfn_to_gaddr(sgfn);
bank->size = tot_size;
@@ -472,7 +475,7 @@ bool __init allocate_bank_memory(struct domain *d, struct kernel_info *kinfo,
tot_size -= (1ULL << (PAGE_SHIFT + order));
}
- kinfo->mem.nr_banks++;
+ mem->nr_banks++;
kinfo->unassigned_mem -= bank->size;
return true;
@@ -757,7 +760,7 @@ int __init domain_fdt_begin_node(void *fdt, const char *name, uint64_t unit)
int __init make_memory_node(const struct domain *d,
void *fdt,
int addrcells, int sizecells,
- struct meminfo *mem)
+ const struct membanks *mem)
{
unsigned int i;
int res, reg_size = addrcells + sizecells;
@@ -817,12 +820,12 @@ int __init make_memory_node(const struct domain *d,
static int __init add_ext_regions(unsigned long s_gfn, unsigned long e_gfn,
void *data)
{
- struct meminfo *ext_regions = data;
+ struct membanks *ext_regions = data;
paddr_t start, size;
paddr_t s = pfn_to_paddr(s_gfn);
paddr_t e = pfn_to_paddr(e_gfn);
- if ( ext_regions->nr_banks >= ARRAY_SIZE(ext_regions->bank) )
+ if ( ext_regions->nr_banks >= ext_regions->max_banks )
return 0;
/*
@@ -864,9 +867,11 @@ static int __init add_ext_regions(unsigned long s_gfn, unsigned long e_gfn,
* - grant table space
*/
static int __init find_unallocated_memory(const struct kernel_info *kinfo,
- struct meminfo *ext_regions)
+ struct membanks *ext_regions)
{
- const struct meminfo *assign_mem = &kinfo->mem;
+ const struct membanks *kinfo_mem = kernel_info_get_mem(kinfo);
+ const struct membanks *mem = bootinfo_get_mem();
+ const struct membanks *reserved_mem = bootinfo_get_reserved_mem();
struct rangeset *unalloc_mem;
paddr_t start, end;
unsigned int i;
@@ -879,10 +884,10 @@ static int __init find_unallocated_memory(const struct kernel_info *kinfo,
return -ENOMEM;
/* Start with all available RAM */
- for ( i = 0; i < bootinfo.mem.nr_banks; i++ )
+ for ( i = 0; i < mem->nr_banks; i++ )
{
- start = bootinfo.mem.bank[i].start;
- end = bootinfo.mem.bank[i].start + bootinfo.mem.bank[i].size;
+ start = mem->bank[i].start;
+ end = mem->bank[i].start + mem->bank[i].size;
res = rangeset_add_range(unalloc_mem, PFN_DOWN(start),
PFN_DOWN(end - 1));
if ( res )
@@ -894,10 +899,10 @@ static int __init find_unallocated_memory(const struct kernel_info *kinfo,
}
/* Remove RAM assigned to Dom0 */
- for ( i = 0; i < assign_mem->nr_banks; i++ )
+ for ( i = 0; i < kinfo_mem->nr_banks; i++ )
{
- start = assign_mem->bank[i].start;
- end = assign_mem->bank[i].start + assign_mem->bank[i].size;
+ start = kinfo_mem->bank[i].start;
+ end = kinfo_mem->bank[i].start + kinfo_mem->bank[i].size;
res = rangeset_remove_range(unalloc_mem, PFN_DOWN(start),
PFN_DOWN(end - 1));
if ( res )
@@ -909,11 +914,10 @@ static int __init find_unallocated_memory(const struct kernel_info *kinfo,
}
/* Remove reserved-memory regions */
- for ( i = 0; i < bootinfo.reserved_mem.nr_banks; i++ )
+ for ( i = 0; i < reserved_mem->nr_banks; i++ )
{
- start = bootinfo.reserved_mem.bank[i].start;
- end = bootinfo.reserved_mem.bank[i].start +
- bootinfo.reserved_mem.bank[i].size;
+ start = reserved_mem->bank[i].start;
+ end = reserved_mem->bank[i].start + reserved_mem->bank[i].size;
res = rangeset_remove_range(unalloc_mem, PFN_DOWN(start),
PFN_DOWN(end - 1));
if ( res )
@@ -991,7 +995,7 @@ static int __init handle_pci_range(const struct dt_device_node *dev,
* - PCI aperture
*/
static int __init find_memory_holes(const struct kernel_info *kinfo,
- struct meminfo *ext_regions)
+ struct membanks *ext_regions)
{
struct dt_device_node *np;
struct rangeset *mem_holes;
@@ -1081,7 +1085,7 @@ out:
}
static int __init find_domU_holes(const struct kernel_info *kinfo,
- struct meminfo *ext_regions)
+ struct membanks *ext_regions)
{
unsigned int i;
uint64_t bankend;
@@ -1093,7 +1097,9 @@ static int __init find_domU_holes(const struct kernel_info *kinfo,
{
struct membank *ext_bank = &(ext_regions->bank[ext_regions->nr_banks]);
- ext_bank->start = ROUNDUP(bankbase[i] + kinfo->mem.bank[i].size, SZ_2M);
+ ext_bank->start = ROUNDUP(bankbase[i] +
+ kernel_info_get_mem(kinfo)->bank[i].size,
+ SZ_2M);
bankend = ~0ULL >> (64 - p2m_ipa_bits);
bankend = min(bankend, bankbase[i] + banksize[i] - 1);
@@ -1121,7 +1127,7 @@ int __init make_hypervisor_node(struct domain *d,
gic_interrupt_t intr;
int res;
void *fdt = kinfo->fdt;
- struct meminfo *ext_regions = NULL;
+ struct membanks *ext_regions = NULL;
unsigned int i, nr_ext_regions;
dt_dprintk("Create hypervisor node\n");
@@ -1157,10 +1163,12 @@ int __init make_hypervisor_node(struct domain *d,
}
else
{
- ext_regions = xzalloc(struct meminfo);
+ ext_regions = (struct membanks *)xzalloc(struct meminfo);
if ( !ext_regions )
return -ENOMEM;
+ ext_regions->max_banks = NR_MEM_BANKS;
+
if ( is_domain_direct_mapped(d) )
{
if ( !is_iommu_enabled(d) )
@@ -1729,6 +1737,7 @@ static int __init handle_node(struct domain *d, struct kernel_info *kinfo,
if ( node == dt_host )
{
+ const struct membanks *reserved_mem = bootinfo_get_reserved_mem();
int addrcells = dt_child_n_addr_cells(node);
int sizecells = dt_child_n_size_cells(node);
@@ -1754,7 +1763,8 @@ static int __init handle_node(struct domain *d, struct kernel_info *kinfo,
if ( res )
return res;
- res = make_memory_node(d, kinfo->fdt, addrcells, sizecells, &kinfo->mem);
+ res = make_memory_node(d, kinfo->fdt, addrcells, sizecells,
+ kernel_info_get_mem(kinfo));
if ( res )
return res;
@@ -1762,16 +1772,16 @@ static int __init handle_node(struct domain *d, struct kernel_info *kinfo,
* Create a second memory node to store the ranges covering
* reserved-memory regions.
*/
- if ( bootinfo.reserved_mem.nr_banks > 0 )
+ if ( reserved_mem->nr_banks > 0 )
{
res = make_memory_node(d, kinfo->fdt, addrcells, sizecells,
- &bootinfo.reserved_mem);
+ reserved_mem);
if ( res )
return res;
}
res = make_resv_memory_node(d, kinfo->fdt, addrcells, sizecells,
- &kinfo->shm_mem);
+ &kinfo->shm_mem.common);
if ( res )
return res;
}
@@ -2040,7 +2050,7 @@ int __init construct_domain(struct domain *d, struct kernel_info *kinfo)
static int __init construct_dom0(struct domain *d)
{
- struct kernel_info kinfo = {};
+ struct kernel_info kinfo = KERNEL_INFO_INIT;
int rc;
/* Sanity! */
diff --git a/xen/arch/arm/efi/efi-boot.h b/xen/arch/arm/efi/efi-boot.h
index 0cb29f90a066..199f5260229d 100644
--- a/xen/arch/arm/efi/efi-boot.h
+++ b/xen/arch/arm/efi/efi-boot.h
@@ -157,14 +157,14 @@ static void __init *lookup_fdt_config_table(EFI_SYSTEM_TABLE *sys_table)
return fdt;
}
-static bool __init meminfo_add_bank(struct meminfo *mem,
+static bool __init meminfo_add_bank(struct membanks *mem,
EFI_MEMORY_DESCRIPTOR *desc)
{
struct membank *bank;
paddr_t start = desc->PhysicalStart;
paddr_t size = desc->NumberOfPages * EFI_PAGE_SIZE;
- if ( mem->nr_banks >= NR_MEM_BANKS )
+ if ( mem->nr_banks >= mem->max_banks )
return false;
#ifdef CONFIG_ACPI
if ( check_reserved_regions_overlap(start, size) )
@@ -198,7 +198,7 @@ static EFI_STATUS __init efi_process_memory_map_bootinfo(EFI_MEMORY_DESCRIPTOR *
(desc_ptr->Type == EfiBootServicesCode ||
desc_ptr->Type == EfiBootServicesData))) )
{
- if ( !meminfo_add_bank(&bootinfo.mem, desc_ptr) )
+ if ( !meminfo_add_bank(bootinfo_get_mem(), desc_ptr) )
{
PrintStr(L"Warning: All " __stringify(NR_MEM_BANKS)
" bootinfo mem banks exhausted.\r\n");
@@ -208,7 +208,7 @@ static EFI_STATUS __init efi_process_memory_map_bootinfo(EFI_MEMORY_DESCRIPTOR *
#ifdef CONFIG_ACPI
else if ( desc_ptr->Type == EfiACPIReclaimMemory )
{
- if ( !meminfo_add_bank(&bootinfo.acpi, desc_ptr) )
+ if ( !meminfo_add_bank(bootinfo_get_acpi(), desc_ptr) )
{
PrintStr(L"Error: All " __stringify(NR_MEM_BANKS)
" acpi meminfo mem banks exhausted.\r\n");
diff --git a/xen/arch/arm/efi/efi-dom0.c b/xen/arch/arm/efi/efi-dom0.c
index aae0f979112a..baee8ab716cb 100644
--- a/xen/arch/arm/efi/efi-dom0.c
+++ b/xen/arch/arm/efi/efi-dom0.c
@@ -44,7 +44,7 @@ size_t __init estimate_efi_size(unsigned int mem_nr_banks)
unsigned int acpi_mem_nr_banks = 0;
if ( !acpi_disabled )
- acpi_mem_nr_banks = bootinfo.acpi.nr_banks;
+ acpi_mem_nr_banks = bootinfo_get_acpi()->nr_banks;
size = ROUNDUP(est_size + ect_size + fw_vendor_size, 8);
/* plus 1 for new created tables */
@@ -107,9 +107,10 @@ static void __init fill_efi_memory_descriptor(EFI_MEMORY_DESCRIPTOR *desc,
}
void __init acpi_create_efi_mmap_table(struct domain *d,
- const struct meminfo *mem,
+ const struct membanks *mem,
struct membank tbl_add[])
{
+ const struct membanks *acpi = bootinfo_get_acpi();
EFI_MEMORY_DESCRIPTOR *desc;
unsigned int i;
u8 *base_ptr;
@@ -122,10 +123,10 @@ void __init acpi_create_efi_mmap_table(struct domain *d,
fill_efi_memory_descriptor(desc, EfiConventionalMemory,
mem->bank[i].start, mem->bank[i].size);
- for ( i = 0; i < bootinfo.acpi.nr_banks; i++, desc++ )
+ for ( i = 0; i < acpi->nr_banks; i++, desc++ )
fill_efi_memory_descriptor(desc, EfiACPIReclaimMemory,
- bootinfo.acpi.bank[i].start,
- bootinfo.acpi.bank[i].size);
+ acpi->bank[i].start,
+ acpi->bank[i].size);
fill_efi_memory_descriptor(desc, EfiACPIReclaimMemory,
d->arch.efi_acpi_gpa, d->arch.efi_acpi_len);
@@ -133,7 +134,7 @@ void __init acpi_create_efi_mmap_table(struct domain *d,
tbl_add[TBL_MMAP].start = d->arch.efi_acpi_gpa
+ acpi_get_table_offset(tbl_add, TBL_MMAP);
tbl_add[TBL_MMAP].size = sizeof(EFI_MEMORY_DESCRIPTOR)
- * (mem->nr_banks + bootinfo.acpi.nr_banks + 1);
+ * (mem->nr_banks + acpi->nr_banks + 1);
}
/* Create /hypervisor/uefi node for efi properties. */
diff --git a/xen/arch/arm/include/asm/domain_build.h b/xen/arch/arm/include/asm/domain_build.h
index da9e6025f37c..a6f276cc4263 100644
--- a/xen/arch/arm/include/asm/domain_build.h
+++ b/xen/arch/arm/include/asm/domain_build.h
@@ -15,7 +15,7 @@ int make_cpus_node(const struct domain *d, void *fdt);
int make_hypervisor_node(struct domain *d, const struct kernel_info *kinfo,
int addrcells, int sizecells);
int make_memory_node(const struct domain *d, void *fdt, int addrcells,
- int sizecells, struct meminfo *mem);
+ int sizecells, const struct membanks *mem);
int make_psci_node(void *fdt);
int make_timer_node(const struct kernel_info *kinfo);
void evtchn_allocate(struct domain *d);
diff --git a/xen/arch/arm/include/asm/kernel.h b/xen/arch/arm/include/asm/kernel.h
index 0a23e86c2d37..d28b843c01a9 100644
--- a/xen/arch/arm/include/asm/kernel.h
+++ b/xen/arch/arm/include/asm/kernel.h
@@ -78,6 +78,15 @@ struct kernel_info {
};
};
+#define kernel_info_get_mem(kinfo) \
+ (&(kinfo)->mem.common)
+
+#define KERNEL_INFO_INIT \
+{ \
+ .mem.common.max_banks = NR_MEM_BANKS, \
+ .shm_mem.common.max_banks = NR_MEM_BANKS, \
+}
+
/*
* Probe the kernel to detemine its type and select a loader.
*
diff --git a/xen/arch/arm/include/asm/setup.h b/xen/arch/arm/include/asm/setup.h
index d15a88d2e0d1..a3e1dc8fdb6c 100644
--- a/xen/arch/arm/include/asm/setup.h
+++ b/xen/arch/arm/include/asm/setup.h
@@ -56,8 +56,14 @@ struct membank {
#endif
};
-struct meminfo {
+struct membanks {
unsigned int nr_banks;
+ unsigned int max_banks;
+ struct membank bank[];
+};
+
+struct meminfo {
+ struct membanks common;
struct membank bank[NR_MEM_BANKS];
};
@@ -107,6 +113,19 @@ struct bootinfo {
bool static_heap;
};
+#ifdef CONFIG_ACPI
+#define BOOTINFO_ACPI_INIT .acpi.common.max_banks = NR_MEM_BANKS,
+#else
+#define BOOTINFO_ACPI_INIT
+#endif
+
+#define BOOTINFO_INIT \
+{ \
+ .mem.common.max_banks = NR_MEM_BANKS, \
+ .reserved_mem.common.max_banks = NR_MEM_BANKS, \
+ BOOTINFO_ACPI_INIT \
+}
+
struct map_range_data
{
struct domain *d;
@@ -122,6 +141,23 @@ extern struct bootinfo bootinfo;
extern domid_t max_init_domid;
+static inline struct membanks *bootinfo_get_mem(void)
+{
+ return &bootinfo.mem.common;
+}
+
+static inline struct membanks *bootinfo_get_reserved_mem(void)
+{
+ return &bootinfo.reserved_mem.common;
+}
+
+#ifdef CONFIG_ACPI
+static inline struct membanks *bootinfo_get_acpi(void)
+{
+ return &bootinfo.acpi.common;
+}
+#endif
+
void copy_from_paddr(void *dst, paddr_t paddr, unsigned long len);
size_t estimate_efi_size(unsigned int mem_nr_banks);
@@ -130,7 +166,7 @@ void acpi_create_efi_system_table(struct domain *d,
struct membank tbl_add[]);
void acpi_create_efi_mmap_table(struct domain *d,
- const struct meminfo *mem,
+ const struct membanks *mem,
struct membank tbl_add[]);
int acpi_make_efi_nodes(void *fdt, struct membank tbl_add[]);
diff --git a/xen/arch/arm/include/asm/static-shmem.h b/xen/arch/arm/include/asm/static-shmem.h
index 1536ff18b895..cc6b414ed79b 100644
--- a/xen/arch/arm/include/asm/static-shmem.h
+++ b/xen/arch/arm/include/asm/static-shmem.h
@@ -8,7 +8,7 @@
#ifdef CONFIG_STATIC_SHM
int make_resv_memory_node(const struct domain *d, void *fdt, int addrcells,
- int sizecells, const struct meminfo *mem);
+ int sizecells, const struct membanks *mem);
int process_shm(struct domain *d, struct kernel_info *kinfo,
const struct dt_device_node *node);
@@ -28,7 +28,7 @@ int process_shm_node(const void *fdt, int node, uint32_t address_cells,
static inline int make_resv_memory_node(const struct domain *d, void *fdt,
int addrcells, int sizecells,
- const struct meminfo *mem)
+ const struct membanks *mem)
{
return 0;
}
diff --git a/xen/arch/arm/kernel.c b/xen/arch/arm/kernel.c
index bc3e5bd6f940..674388fa11a2 100644
--- a/xen/arch/arm/kernel.c
+++ b/xen/arch/arm/kernel.c
@@ -45,13 +45,14 @@ static void __init place_modules(struct kernel_info *info,
{
/* Align DTB and initrd size to 2Mb. Linux only requires 4 byte alignment */
const struct bootmodule *mod = info->initrd_bootmodule;
+ const struct membanks *mem = kernel_info_get_mem(info);
const paddr_t initrd_len = ROUNDUP(mod ? mod->size : 0, MB(2));
const paddr_t dtb_len = ROUNDUP(fdt_totalsize(info->fdt), MB(2));
const paddr_t modsize = initrd_len + dtb_len;
/* Convenient */
- const paddr_t rambase = info->mem.bank[0].start;
- const paddr_t ramsize = info->mem.bank[0].size;
+ const paddr_t rambase = mem->bank[0].start;
+ const paddr_t ramsize = mem->bank[0].size;
const paddr_t ramend = rambase + ramsize;
const paddr_t kernsize = ROUNDUP(kernend, MB(2)) - kernbase;
const paddr_t ram128mb = rambase + MB(128);
@@ -96,11 +97,12 @@ static void __init place_modules(struct kernel_info *info,
static paddr_t __init kernel_zimage_place(struct kernel_info *info)
{
+ const struct membanks *mem = kernel_info_get_mem(info);
paddr_t load_addr;
#ifdef CONFIG_ARM_64
if ( (info->type == DOMAIN_64BIT) && (info->zimage.start == 0) )
- return info->mem.bank[0].start + info->zimage.text_offset;
+ return mem->bank[0].start + info->zimage.text_offset;
#endif
/*
@@ -113,8 +115,8 @@ static paddr_t __init kernel_zimage_place(struct kernel_info *info)
{
paddr_t load_end;
- load_end = info->mem.bank[0].start + info->mem.bank[0].size;
- load_end = MIN(info->mem.bank[0].start + MB(128), load_end);
+ load_end = mem->bank[0].start + mem->bank[0].size;
+ load_end = MIN(mem->bank[0].start + MB(128), load_end);
load_addr = load_end - info->zimage.len;
/* Align to 2MB */
diff --git a/xen/arch/arm/setup.c b/xen/arch/arm/setup.c
index 424744ad5e1a..02bd27eb0c69 100644
--- a/xen/arch/arm/setup.c
+++ b/xen/arch/arm/setup.c
@@ -48,7 +48,7 @@
#include <xsm/xsm.h>
#include <asm/acpi.h>
-struct bootinfo __initdata bootinfo;
+struct bootinfo __initdata bootinfo = BOOTINFO_INIT;
/*
* Sanitized version of cpuinfo containing only features available on all
@@ -207,6 +207,7 @@ static void __init dt_unreserved_regions(paddr_t s, paddr_t e,
void (*cb)(paddr_t ps, paddr_t pe),
unsigned int first)
{
+ const struct membanks *reserved_mem = bootinfo_get_reserved_mem();
unsigned int i, nr;
int rc;
@@ -240,14 +241,14 @@ static void __init dt_unreserved_regions(paddr_t s, paddr_t e,
* kinds.
*
* When retrieving the corresponding reserved-memory addresses
- * below, we need to index the bootinfo.reserved_mem bank starting
+ * below, we need to index the reserved_mem->bank starting
* from 0, and only counting the reserved-memory modules. Hence,
* we need to use i - nr.
*/
- for ( ; i - nr < bootinfo.reserved_mem.nr_banks; i++ )
+ for ( ; i - nr < reserved_mem->nr_banks; i++ )
{
- paddr_t r_s = bootinfo.reserved_mem.bank[i - nr].start;
- paddr_t r_e = r_s + bootinfo.reserved_mem.bank[i - nr].size;
+ paddr_t r_s = reserved_mem->bank[i - nr].start;
+ paddr_t r_e = r_s + reserved_mem->bank[i - nr].size;
if ( s < r_e && r_s < e )
{
@@ -264,18 +265,18 @@ static void __init dt_unreserved_regions(paddr_t s, paddr_t e,
* TODO: '*_end' could be 0 if the bank/region is at the end of the physical
* address space. This is for now not handled as it requires more rework.
*/
-static bool __init meminfo_overlap_check(struct meminfo *meminfo,
+static bool __init meminfo_overlap_check(const struct membanks *mem,
paddr_t region_start,
paddr_t region_size)
{
paddr_t bank_start = INVALID_PADDR, bank_end = 0;
paddr_t region_end = region_start + region_size;
- unsigned int i, bank_num = meminfo->nr_banks;
+ unsigned int i, bank_num = mem->nr_banks;
for ( i = 0; i < bank_num; i++ )
{
- bank_start = meminfo->bank[i].start;
- bank_end = bank_start + meminfo->bank[i].size;
+ bank_start = mem->bank[i].start;
+ bank_end = bank_start + mem->bank[i].size;
if ( region_end <= bank_start || region_start >= bank_end )
continue;
@@ -339,8 +340,11 @@ void __init fw_unreserved_regions(paddr_t s, paddr_t e,
bool __init check_reserved_regions_overlap(paddr_t region_start,
paddr_t region_size)
{
- /* Check if input region is overlapping with bootinfo.reserved_mem banks */
- if ( meminfo_overlap_check(&bootinfo.reserved_mem,
+ /*
+ * Check if input region is overlapping with bootinfo_get_reserved_mem()
+ * banks
+ */
+ if ( meminfo_overlap_check(bootinfo_get_reserved_mem(),
region_start, region_size) )
return true;
@@ -351,7 +355,7 @@ bool __init check_reserved_regions_overlap(paddr_t region_start,
#ifdef CONFIG_ACPI
/* Check if input region is overlapping with ACPI EfiACPIReclaimMemory */
- if ( meminfo_overlap_check(&bootinfo.acpi, region_start, region_size) )
+ if ( meminfo_overlap_check(bootinfo_get_acpi(), region_start, region_size) )
return true;
#endif
@@ -580,6 +584,7 @@ static paddr_t __init next_module(paddr_t s, paddr_t *end)
void __init init_pdx(void)
{
+ const struct membanks *mem = bootinfo_get_mem();
paddr_t bank_start, bank_size, bank_end;
/*
@@ -592,18 +597,18 @@ void __init init_pdx(void)
uint64_t mask = pdx_init_mask(0x0);
int bank;
- for ( bank = 0 ; bank < bootinfo.mem.nr_banks; bank++ )
+ for ( bank = 0 ; bank < mem->nr_banks; bank++ )
{
- bank_start = bootinfo.mem.bank[bank].start;
- bank_size = bootinfo.mem.bank[bank].size;
+ bank_start = mem->bank[bank].start;
+ bank_size = mem->bank[bank].size;
mask |= bank_start | pdx_region_mask(bank_start, bank_size);
}
- for ( bank = 0 ; bank < bootinfo.mem.nr_banks; bank++ )
+ for ( bank = 0 ; bank < mem->nr_banks; bank++ )
{
- bank_start = bootinfo.mem.bank[bank].start;
- bank_size = bootinfo.mem.bank[bank].size;
+ bank_start = mem->bank[bank].start;
+ bank_size = mem->bank[bank].size;
if (~mask & pdx_region_mask(bank_start, bank_size))
mask = 0;
@@ -611,10 +616,10 @@ void __init init_pdx(void)
pfn_pdx_hole_setup(mask >> PAGE_SHIFT);
- for ( bank = 0 ; bank < bootinfo.mem.nr_banks; bank++ )
+ for ( bank = 0 ; bank < mem->nr_banks; bank++ )
{
- bank_start = bootinfo.mem.bank[bank].start;
- bank_size = bootinfo.mem.bank[bank].size;
+ bank_start = mem->bank[bank].start;
+ bank_size = mem->bank[bank].size;
bank_end = bank_start + bank_size;
set_pdx_range(paddr_to_pfn(bank_start),
@@ -636,18 +641,19 @@ void __init init_pdx(void)
void __init populate_boot_allocator(void)
{
unsigned int i;
- const struct meminfo *banks = &bootinfo.mem;
+ const struct membanks *banks = bootinfo_get_mem();
+ const struct membanks *reserved_mem = bootinfo_get_reserved_mem();
paddr_t s, e;
if ( bootinfo.static_heap )
{
- for ( i = 0 ; i < bootinfo.reserved_mem.nr_banks; i++ )
+ for ( i = 0 ; i < reserved_mem->nr_banks; i++ )
{
- if ( bootinfo.reserved_mem.bank[i].type != MEMBANK_STATIC_HEAP )
+ if ( reserved_mem->bank[i].type != MEMBANK_STATIC_HEAP )
continue;
- s = bootinfo.reserved_mem.bank[i].start;
- e = s + bootinfo.reserved_mem.bank[i].size;
+ s = reserved_mem->bank[i].start;
+ e = s + reserved_mem->bank[i].size;
#ifdef CONFIG_ARM_32
/* Avoid the xenheap, note that the xenheap cannot across a bank */
if ( s <= mfn_to_maddr(directmap_mfn_start) &&
diff --git a/xen/arch/arm/static-memory.c b/xen/arch/arm/static-memory.c
index cffbab7241b7..34bd12696a53 100644
--- a/xen/arch/arm/static-memory.c
+++ b/xen/arch/arm/static-memory.c
@@ -85,6 +85,7 @@ static int __init parse_static_mem_prop(const struct dt_device_node *node,
void __init allocate_static_memory(struct domain *d, struct kernel_info *kinfo,
const struct dt_device_node *node)
{
+ struct membanks *mem = kernel_info_get_mem(kinfo);
u32 addr_cells, size_cells, reg_cells;
unsigned int nr_banks, gbank, bank = 0;
const uint64_t rambase[] = GUEST_RAM_BANK_BASES;
@@ -106,7 +107,7 @@ void __init allocate_static_memory(struct domain *d, struct kernel_info *kinfo,
*/
gbank = 0;
gsize = ramsize[gbank];
- kinfo->mem.bank[gbank].start = rambase[gbank];
+ mem->bank[gbank].start = rambase[gbank];
nr_banks = length / (reg_cells * sizeof (u32));
for ( ; bank < nr_banks; bank++ )
@@ -122,7 +123,7 @@ void __init allocate_static_memory(struct domain *d, struct kernel_info *kinfo,
while ( 1 )
{
/* Map as much as possible the static range to the guest bank */
- if ( !append_static_memory_to_bank(d, &kinfo->mem.bank[gbank], smfn,
+ if ( !append_static_memory_to_bank(d, &mem->bank[gbank], smfn,
min(psize, gsize)) )
goto fail;
@@ -153,14 +154,14 @@ void __init allocate_static_memory(struct domain *d, struct kernel_info *kinfo,
/* Update to the next guest bank. */
gbank++;
gsize = ramsize[gbank];
- kinfo->mem.bank[gbank].start = rambase[gbank];
+ mem->bank[gbank].start = rambase[gbank];
}
}
tot_size += psize;
}
- kinfo->mem.nr_banks = ++gbank;
+ mem->nr_banks = ++gbank;
kinfo->unassigned_mem -= tot_size;
/*
@@ -190,6 +191,7 @@ void __init allocate_static_memory(struct domain *d, struct kernel_info *kinfo,
void __init assign_static_memory_11(struct domain *d, struct kernel_info *kinfo,
const struct dt_device_node *node)
{
+ struct membanks *mem = kernel_info_get_mem(kinfo);
u32 addr_cells, size_cells, reg_cells;
unsigned int nr_banks, bank = 0;
const __be32 *cell;
@@ -206,7 +208,7 @@ void __init assign_static_memory_11(struct domain *d, struct kernel_info *kinfo,
reg_cells = addr_cells + size_cells;
nr_banks = length / (reg_cells * sizeof(u32));
- if ( nr_banks > NR_MEM_BANKS )
+ if ( nr_banks > mem->max_banks )
{
printk(XENLOG_ERR
"%pd: exceed max number of supported guest memory banks.\n", d);
@@ -224,15 +226,15 @@ void __init assign_static_memory_11(struct domain *d, struct kernel_info *kinfo,
d, bank, pbase, pbase + psize);
/* One guest memory bank is matched with one physical memory bank. */
- kinfo->mem.bank[bank].start = pbase;
- if ( !append_static_memory_to_bank(d, &kinfo->mem.bank[bank],
+ mem->bank[bank].start = pbase;
+ if ( !append_static_memory_to_bank(d, &mem->bank[bank],
smfn, psize) )
goto fail;
kinfo->unassigned_mem -= psize;
}
- kinfo->mem.nr_banks = nr_banks;
+ mem->nr_banks = nr_banks;
/*
* The property 'memory' should match the amount of memory given to
@@ -257,14 +259,15 @@ void __init assign_static_memory_11(struct domain *d, struct kernel_info *kinfo,
/* Static memory initialization */
void __init init_staticmem_pages(void)
{
+ const struct membanks *reserved_mem = bootinfo_get_reserved_mem();
unsigned int bank;
- for ( bank = 0 ; bank < bootinfo.reserved_mem.nr_banks; bank++ )
+ for ( bank = 0 ; bank < reserved_mem->nr_banks; bank++ )
{
- if ( bootinfo.reserved_mem.bank[bank].type == MEMBANK_STATIC_DOMAIN )
+ if ( reserved_mem->bank[bank].type == MEMBANK_STATIC_DOMAIN )
{
- mfn_t bank_start = _mfn(PFN_UP(bootinfo.reserved_mem.bank[bank].start));
- unsigned long bank_pages = PFN_DOWN(bootinfo.reserved_mem.bank[bank].size);
+ mfn_t bank_start = _mfn(PFN_UP(reserved_mem->bank[bank].start));
+ unsigned long bank_pages = PFN_DOWN(reserved_mem->bank[bank].size);
mfn_t bank_end = mfn_add(bank_start, bank_pages);
if ( mfn_x(bank_end) <= mfn_x(bank_start) )
diff --git a/xen/arch/arm/static-shmem.c b/xen/arch/arm/static-shmem.c
index 40a0e860c79d..fdc3bccde402 100644
--- a/xen/arch/arm/static-shmem.c
+++ b/xen/arch/arm/static-shmem.c
@@ -10,22 +10,23 @@ static int __init acquire_nr_borrower_domain(struct domain *d,
paddr_t pbase, paddr_t psize,
unsigned long *nr_borrowers)
{
+ const struct membanks *reserved_mem = bootinfo_get_reserved_mem();
unsigned int bank;
/* Iterate reserved memory to find requested shm bank. */
- for ( bank = 0 ; bank < bootinfo.reserved_mem.nr_banks; bank++ )
+ for ( bank = 0 ; bank < reserved_mem->nr_banks; bank++ )
{
- paddr_t bank_start = bootinfo.reserved_mem.bank[bank].start;
- paddr_t bank_size = bootinfo.reserved_mem.bank[bank].size;
+ paddr_t bank_start = reserved_mem->bank[bank].start;
+ paddr_t bank_size = reserved_mem->bank[bank].size;
if ( (pbase == bank_start) && (psize == bank_size) )
break;
}
- if ( bank == bootinfo.reserved_mem.nr_banks )
+ if ( bank == reserved_mem->nr_banks )
return -ENOENT;
- *nr_borrowers = bootinfo.reserved_mem.bank[bank].nr_shm_borrowers;
+ *nr_borrowers = reserved_mem->bank[bank].nr_shm_borrowers;
return 0;
}
@@ -157,17 +158,17 @@ static int __init assign_shared_memory(struct domain *d,
return ret;
}
-static int __init append_shm_bank_to_domain(struct kernel_info *kinfo,
+static int __init append_shm_bank_to_domain(struct membanks *shm_mem,
paddr_t start, paddr_t size,
const char *shm_id)
{
- if ( kinfo->shm_mem.nr_banks >= NR_MEM_BANKS )
+ if ( shm_mem->nr_banks >= shm_mem->max_banks )
return -ENOMEM;
- kinfo->shm_mem.bank[kinfo->shm_mem.nr_banks].start = start;
- kinfo->shm_mem.bank[kinfo->shm_mem.nr_banks].size = size;
- safe_strcpy(kinfo->shm_mem.bank[kinfo->shm_mem.nr_banks].shm_id, shm_id);
- kinfo->shm_mem.nr_banks++;
+ shm_mem->bank[shm_mem->nr_banks].start = start;
+ shm_mem->bank[shm_mem->nr_banks].size = size;
+ safe_strcpy(shm_mem->bank[shm_mem->nr_banks].shm_id, shm_id);
+ shm_mem->nr_banks++;
return 0;
}
@@ -269,7 +270,8 @@ int __init process_shm(struct domain *d, struct kernel_info *kinfo,
* Record static shared memory region info for later setting
* up shm-node in guest device tree.
*/
- ret = append_shm_bank_to_domain(kinfo, gbase, psize, shm_id);
+ ret = append_shm_bank_to_domain(&kinfo->shm_mem.common, gbase, psize,
+ shm_id);
if ( ret )
return ret;
}
@@ -279,7 +281,7 @@ int __init process_shm(struct domain *d, struct kernel_info *kinfo,
static int __init make_shm_memory_node(const struct domain *d, void *fdt,
int addrcells, int sizecells,
- const struct meminfo *mem)
+ const struct membanks *mem)
{
unsigned int i = 0;
int res = 0;
@@ -350,7 +352,7 @@ int __init process_shm_node(const void *fdt, int node, uint32_t address_cells,
const struct fdt_property *prop, *prop_id, *prop_role;
const __be32 *cell;
paddr_t paddr, gaddr, size, end;
- struct meminfo *mem = &bootinfo.reserved_mem;
+ struct membanks *mem = bootinfo_get_reserved_mem();
unsigned int i;
int len;
bool owner = false;
@@ -460,7 +462,7 @@ int __init process_shm_node(const void *fdt, int node, uint32_t address_cells,
if ( i == mem->nr_banks )
{
- if ( i < NR_MEM_BANKS )
+ if (i < mem->max_banks)
{
if ( check_reserved_regions_overlap(paddr, size) )
return -EINVAL;
@@ -490,7 +492,7 @@ int __init process_shm_node(const void *fdt, int node, uint32_t address_cells,
int __init make_resv_memory_node(const struct domain *d, void *fdt,
int addrcells, int sizecells,
- const struct meminfo *mem)
+ const struct membanks *mem)
{
int res = 0;
/* Placeholder for reserved-memory\0 */
--
2.34.1
^ permalink raw reply related [flat|nested] 32+ messages in thread
* [PATCH 04/11] xen/arm: Conditional compilation of kernel_info.shm_mem member
2024-03-12 13:03 [PATCH 00/11] Static shared memory followup v2 - pt1 Luca Fancellu
` (2 preceding siblings ...)
2024-03-12 13:03 ` [PATCH 03/11] xen/arm: Introduce a generic way to access memory bank structures Luca Fancellu
@ 2024-03-12 13:03 ` Luca Fancellu
2024-03-19 14:58 ` Michal Orzel
2024-03-12 13:03 ` [PATCH 05/11] xen/arm: Introduce helper for static memory pages Luca Fancellu
` (6 subsequent siblings)
10 siblings, 1 reply; 32+ messages in thread
From: Luca Fancellu @ 2024-03-12 13:03 UTC (permalink / raw)
To: xen-devel
Cc: Stefano Stabellini, Julien Grall, Bertrand Marquis, Michal Orzel,
Volodymyr Babchuk
The user of shm_mem member of the 'struct kernel_info' is only
the code managing the static shared memory feature, which can be
compiled out using CONFIG_STATIC_SHM, so in case the feature is
not requested, that member won't be used and will waste memory
space.
To address this issue, protect the member with the Kconfig parameter
and modify the signature of the only function using it to remove
any reference to the member from outside the static-shmem module.
Signed-off-by: Luca Fancellu <luca.fancellu@arm.com>
---
xen/arch/arm/dom0less-build.c | 3 +--
xen/arch/arm/domain_build.c | 3 +--
xen/arch/arm/include/asm/kernel.h | 10 +++++++++-
xen/arch/arm/include/asm/static-shmem.h | 11 ++++++-----
xen/arch/arm/static-shmem.c | 8 +++++---
5 files changed, 22 insertions(+), 13 deletions(-)
diff --git a/xen/arch/arm/dom0less-build.c b/xen/arch/arm/dom0less-build.c
index 0165da6f2986..fe2a771d4984 100644
--- a/xen/arch/arm/dom0less-build.c
+++ b/xen/arch/arm/dom0less-build.c
@@ -647,8 +647,7 @@ static int __init prepare_dtb_domU(struct domain *d, struct kernel_info *kinfo)
if ( ret )
goto err;
- ret = make_resv_memory_node(d, kinfo->fdt, addrcells, sizecells,
- &kinfo->shm_mem.common);
+ ret = make_resv_memory_node(d, kinfo, addrcells, sizecells);
if ( ret )
goto err;
diff --git a/xen/arch/arm/domain_build.c b/xen/arch/arm/domain_build.c
index 62fcdfbdaff2..b254f252e7cb 100644
--- a/xen/arch/arm/domain_build.c
+++ b/xen/arch/arm/domain_build.c
@@ -1780,8 +1780,7 @@ static int __init handle_node(struct domain *d, struct kernel_info *kinfo,
return res;
}
- res = make_resv_memory_node(d, kinfo->fdt, addrcells, sizecells,
- &kinfo->shm_mem.common);
+ res = make_resv_memory_node(d, kinfo, addrcells, sizecells);
if ( res )
return res;
}
diff --git a/xen/arch/arm/include/asm/kernel.h b/xen/arch/arm/include/asm/kernel.h
index d28b843c01a9..5785da985ccf 100644
--- a/xen/arch/arm/include/asm/kernel.h
+++ b/xen/arch/arm/include/asm/kernel.h
@@ -39,7 +39,9 @@ struct kernel_info {
void *fdt; /* flat device tree */
paddr_t unassigned_mem; /* RAM not (yet) assigned to a bank */
struct meminfo mem;
+#ifdef CONFIG_STATIC_SHM
struct meminfo shm_mem;
+#endif
/* kernel entry point */
paddr_t entry;
@@ -81,10 +83,16 @@ struct kernel_info {
#define kernel_info_get_mem(kinfo) \
(&(kinfo)->mem.common)
+#ifdef CONFIG_STATIC_SHM
+#define KERNEL_INFO_SHM_MEM_INIT .shm_mem.common.max_banks = NR_MEM_BANKS,
+#else
+#define KERNEL_INFO_SHM_MEM_INIT
+#endif
+
#define KERNEL_INFO_INIT \
{ \
.mem.common.max_banks = NR_MEM_BANKS, \
- .shm_mem.common.max_banks = NR_MEM_BANKS, \
+ KERNEL_INFO_SHM_MEM_INIT \
}
/*
diff --git a/xen/arch/arm/include/asm/static-shmem.h b/xen/arch/arm/include/asm/static-shmem.h
index cc6b414ed79b..108cedb55a9f 100644
--- a/xen/arch/arm/include/asm/static-shmem.h
+++ b/xen/arch/arm/include/asm/static-shmem.h
@@ -7,8 +7,9 @@
#ifdef CONFIG_STATIC_SHM
-int make_resv_memory_node(const struct domain *d, void *fdt, int addrcells,
- int sizecells, const struct membanks *mem);
+int make_resv_memory_node(const struct domain *d,
+ const struct kernel_info *kinfo, int addrcells,
+ int sizecells);
int process_shm(struct domain *d, struct kernel_info *kinfo,
const struct dt_device_node *node);
@@ -26,9 +27,9 @@ int process_shm_node(const void *fdt, int node, uint32_t address_cells,
#else /* !CONFIG_STATIC_SHM */
-static inline int make_resv_memory_node(const struct domain *d, void *fdt,
- int addrcells, int sizecells,
- const struct membanks *mem)
+static inline int make_resv_memory_node(const struct domain *d,
+ const struct kernel_info *kinfo,
+ int addrcells, int sizecells)
{
return 0;
}
diff --git a/xen/arch/arm/static-shmem.c b/xen/arch/arm/static-shmem.c
index fdc3bccde402..8b7da952be6e 100644
--- a/xen/arch/arm/static-shmem.c
+++ b/xen/arch/arm/static-shmem.c
@@ -490,13 +490,15 @@ int __init process_shm_node(const void *fdt, int node, uint32_t address_cells,
return 0;
}
-int __init make_resv_memory_node(const struct domain *d, void *fdt,
- int addrcells, int sizecells,
- const struct membanks *mem)
+int __init make_resv_memory_node(const struct domain *d,
+ const struct kernel_info *kinfo,
+ int addrcells, int sizecells)
{
int res = 0;
/* Placeholder for reserved-memory\0 */
const char resvbuf[16] = "reserved-memory";
+ const struct membanks *mem = &kinfo->shm_mem.common;
+ void *fdt = kinfo->fdt;
if ( mem->nr_banks == 0 )
/* No shared memory provided. */
--
2.34.1
^ permalink raw reply related [flat|nested] 32+ messages in thread
* [PATCH 05/11] xen/arm: Introduce helper for static memory pages
2024-03-12 13:03 [PATCH 00/11] Static shared memory followup v2 - pt1 Luca Fancellu
` (3 preceding siblings ...)
2024-03-12 13:03 ` [PATCH 04/11] xen/arm: Conditional compilation of kernel_info.shm_mem member Luca Fancellu
@ 2024-03-12 13:03 ` Luca Fancellu
2024-03-20 10:41 ` Michal Orzel
2024-03-12 13:03 ` [PATCH 06/11] xen/arm: Avoid code duplication in find_unallocated_memory Luca Fancellu
` (5 subsequent siblings)
10 siblings, 1 reply; 32+ messages in thread
From: Luca Fancellu @ 2024-03-12 13:03 UTC (permalink / raw)
To: xen-devel
Cc: Stefano Stabellini, Julien Grall, Bertrand Marquis, Michal Orzel,
Volodymyr Babchuk
Introduce a new helper function in the static-memory module
that can be called to manage static memory banks, this is
done to reuse the code when other modules would like to
manage static memory banks that are not part of the
reserved_mem structure.
Signed-off-by: Luca Fancellu <luca.fancellu@arm.com>
---
xen/arch/arm/include/asm/static-memory.h | 12 ++++++++++++
xen/arch/arm/static-memory.c | 12 +-----------
2 files changed, 13 insertions(+), 11 deletions(-)
diff --git a/xen/arch/arm/include/asm/static-memory.h b/xen/arch/arm/include/asm/static-memory.h
index 3e3efd70c38d..665d4df50eda 100644
--- a/xen/arch/arm/include/asm/static-memory.h
+++ b/xen/arch/arm/include/asm/static-memory.h
@@ -7,6 +7,18 @@
#ifdef CONFIG_STATIC_MEMORY
+static inline void init_staticmem_bank(const struct membank *bank)
+{
+ mfn_t bank_start = _mfn(PFN_UP(bank->start));
+ unsigned long bank_pages = PFN_DOWN(bank->size);
+ mfn_t bank_end = mfn_add(bank_start, bank_pages);
+
+ if ( mfn_x(bank_end) <= mfn_x(bank_start) )
+ return;
+
+ unprepare_staticmem_pages(mfn_to_page(bank_start), bank_pages, false);
+}
+
void allocate_static_memory(struct domain *d, struct kernel_info *kinfo,
const struct dt_device_node *node);
void assign_static_memory_11(struct domain *d, struct kernel_info *kinfo,
diff --git a/xen/arch/arm/static-memory.c b/xen/arch/arm/static-memory.c
index 34bd12696a53..d4585c5a0633 100644
--- a/xen/arch/arm/static-memory.c
+++ b/xen/arch/arm/static-memory.c
@@ -265,17 +265,7 @@ void __init init_staticmem_pages(void)
for ( bank = 0 ; bank < reserved_mem->nr_banks; bank++ )
{
if ( reserved_mem->bank[bank].type == MEMBANK_STATIC_DOMAIN )
- {
- mfn_t bank_start = _mfn(PFN_UP(reserved_mem->bank[bank].start));
- unsigned long bank_pages = PFN_DOWN(reserved_mem->bank[bank].size);
- mfn_t bank_end = mfn_add(bank_start, bank_pages);
-
- if ( mfn_x(bank_end) <= mfn_x(bank_start) )
- return;
-
- unprepare_staticmem_pages(mfn_to_page(bank_start),
- bank_pages, false);
- }
+ init_staticmem_bank(&reserved_mem->bank[bank]);
}
}
--
2.34.1
^ permalink raw reply related [flat|nested] 32+ messages in thread
* [PATCH 06/11] xen/arm: Avoid code duplication in find_unallocated_memory
2024-03-12 13:03 [PATCH 00/11] Static shared memory followup v2 - pt1 Luca Fancellu
` (4 preceding siblings ...)
2024-03-12 13:03 ` [PATCH 05/11] xen/arm: Introduce helper for static memory pages Luca Fancellu
@ 2024-03-12 13:03 ` Luca Fancellu
2024-03-20 10:57 ` Michal Orzel
2024-03-12 13:03 ` [PATCH 07/11] xen/arm: Avoid code duplication in check_reserved_regions_overlap Luca Fancellu
` (4 subsequent siblings)
10 siblings, 1 reply; 32+ messages in thread
From: Luca Fancellu @ 2024-03-12 13:03 UTC (permalink / raw)
To: xen-devel
Cc: Stefano Stabellini, Julien Grall, Bertrand Marquis, Michal Orzel,
Volodymyr Babchuk
The function find_unallocated_memory is using the same code to
loop through 3 structure of the same type, in order to avoid
code duplication, rework the code to have only one loop that
goes through all the structures.
Signed-off-by: Luca Fancellu <luca.fancellu@arm.com>
---
xen/arch/arm/domain_build.c | 62 ++++++++++---------------------------
1 file changed, 17 insertions(+), 45 deletions(-)
diff --git a/xen/arch/arm/domain_build.c b/xen/arch/arm/domain_build.c
index b254f252e7cb..d0f2ac6060eb 100644
--- a/xen/arch/arm/domain_build.c
+++ b/xen/arch/arm/domain_build.c
@@ -869,12 +869,14 @@ static int __init add_ext_regions(unsigned long s_gfn, unsigned long e_gfn,
static int __init find_unallocated_memory(const struct kernel_info *kinfo,
struct membanks *ext_regions)
{
- const struct membanks *kinfo_mem = kernel_info_get_mem(kinfo);
- const struct membanks *mem = bootinfo_get_mem();
- const struct membanks *reserved_mem = bootinfo_get_reserved_mem();
+ const struct membanks *mem_banks[] = {
+ bootinfo_get_mem(),
+ kernel_info_get_mem(kinfo),
+ bootinfo_get_reserved_mem(),
+ };
struct rangeset *unalloc_mem;
paddr_t start, end;
- unsigned int i;
+ unsigned int i, j;
int res;
dt_dprintk("Find unallocated memory for extended regions\n");
@@ -883,50 +885,20 @@ static int __init find_unallocated_memory(const struct kernel_info *kinfo,
if ( !unalloc_mem )
return -ENOMEM;
- /* Start with all available RAM */
- for ( i = 0; i < mem->nr_banks; i++ )
- {
- start = mem->bank[i].start;
- end = mem->bank[i].start + mem->bank[i].size;
- res = rangeset_add_range(unalloc_mem, PFN_DOWN(start),
- PFN_DOWN(end - 1));
- if ( res )
- {
- printk(XENLOG_ERR "Failed to add: %#"PRIpaddr"->%#"PRIpaddr"\n",
- start, end);
- goto out;
- }
- }
-
- /* Remove RAM assigned to Dom0 */
- for ( i = 0; i < kinfo_mem->nr_banks; i++ )
- {
- start = kinfo_mem->bank[i].start;
- end = kinfo_mem->bank[i].start + kinfo_mem->bank[i].size;
- res = rangeset_remove_range(unalloc_mem, PFN_DOWN(start),
- PFN_DOWN(end - 1));
- if ( res )
+ for ( i = 0; i < ARRAY_SIZE(mem_banks); i++ )
+ for ( j = 0; j < mem_banks[i]->nr_banks; j++ )
{
- printk(XENLOG_ERR "Failed to remove: %#"PRIpaddr"->%#"PRIpaddr"\n",
- start, end);
- goto out;
- }
- }
-
- /* Remove reserved-memory regions */
- for ( i = 0; i < reserved_mem->nr_banks; i++ )
- {
- start = reserved_mem->bank[i].start;
- end = reserved_mem->bank[i].start + reserved_mem->bank[i].size;
- res = rangeset_remove_range(unalloc_mem, PFN_DOWN(start),
+ start = mem_banks[i]->bank[j].start;
+ end = mem_banks[i]->bank[j].start + mem_banks[i]->bank[j].size;
+ res = rangeset_add_range(unalloc_mem, PFN_DOWN(start),
PFN_DOWN(end - 1));
- if ( res )
- {
- printk(XENLOG_ERR "Failed to remove: %#"PRIpaddr"->%#"PRIpaddr"\n",
- start, end);
- goto out;
+ if ( res )
+ {
+ printk(XENLOG_ERR "Failed to add: %#"PRIpaddr"->%#"PRIpaddr"\n",
+ start, end);
+ goto out;
+ }
}
- }
/* Remove grant table region */
if ( kinfo->gnttab_size )
--
2.34.1
^ permalink raw reply related [flat|nested] 32+ messages in thread
* [PATCH 07/11] xen/arm: Avoid code duplication in check_reserved_regions_overlap
2024-03-12 13:03 [PATCH 00/11] Static shared memory followup v2 - pt1 Luca Fancellu
` (5 preceding siblings ...)
2024-03-12 13:03 ` [PATCH 06/11] xen/arm: Avoid code duplication in find_unallocated_memory Luca Fancellu
@ 2024-03-12 13:03 ` Luca Fancellu
2024-03-12 13:03 ` [PATCH 08/11] xen/arm: Reduce struct membank size on static shared memory Luca Fancellu
` (3 subsequent siblings)
10 siblings, 0 replies; 32+ messages in thread
From: Luca Fancellu @ 2024-03-12 13:03 UTC (permalink / raw)
To: xen-devel
Cc: Stefano Stabellini, Julien Grall, Bertrand Marquis, Michal Orzel,
Volodymyr Babchuk
The function check_reserved_regions_overlap is calling
'meminfo_overlap_check' on the same type of structure, this code
can be written in a way to avoid code duplication, so rework the
function to do that.
Signed-off-by: Luca Fancellu <luca.fancellu@arm.com>
---
xen/arch/arm/setup.c | 24 +++++++++++++-----------
1 file changed, 13 insertions(+), 11 deletions(-)
diff --git a/xen/arch/arm/setup.c b/xen/arch/arm/setup.c
index 02bd27eb0c69..cc719d508d63 100644
--- a/xen/arch/arm/setup.c
+++ b/xen/arch/arm/setup.c
@@ -340,25 +340,27 @@ void __init fw_unreserved_regions(paddr_t s, paddr_t e,
bool __init check_reserved_regions_overlap(paddr_t region_start,
paddr_t region_size)
{
+ const struct membanks *mem_banks[] = {
+ bootinfo_get_reserved_mem(),
+#ifdef CONFIG_ACPI
+ bootinfo_get_acpi(),
+#endif
+ };
+ unsigned int i;
+
/*
- * Check if input region is overlapping with bootinfo_get_reserved_mem()
- * banks
+ * Check if input region is overlapping with reserved memory banks or
+ * ACPI EfiACPIReclaimMemory (when ACPI feature is enabled)
*/
- if ( meminfo_overlap_check(bootinfo_get_reserved_mem(),
- region_start, region_size) )
- return true;
+ for ( i = 0; i < ARRAY_SIZE(mem_banks); i++ )
+ if ( meminfo_overlap_check(mem_banks[i], region_start, region_size) )
+ return true;
/* Check if input region is overlapping with bootmodules */
if ( bootmodules_overlap_check(&bootinfo.modules,
region_start, region_size) )
return true;
-#ifdef CONFIG_ACPI
- /* Check if input region is overlapping with ACPI EfiACPIReclaimMemory */
- if ( meminfo_overlap_check(bootinfo_get_acpi(), region_start, region_size) )
- return true;
-#endif
-
return false;
}
--
2.34.1
^ permalink raw reply related [flat|nested] 32+ messages in thread
* [PATCH 08/11] xen/arm: Reduce struct membank size on static shared memory
2024-03-12 13:03 [PATCH 00/11] Static shared memory followup v2 - pt1 Luca Fancellu
` (6 preceding siblings ...)
2024-03-12 13:03 ` [PATCH 07/11] xen/arm: Avoid code duplication in check_reserved_regions_overlap Luca Fancellu
@ 2024-03-12 13:03 ` Luca Fancellu
2024-03-22 10:30 ` Michal Orzel
2024-03-12 13:03 ` [PATCH 09/11] xen/arm: remove shm holes for extended regions Luca Fancellu
` (2 subsequent siblings)
10 siblings, 1 reply; 32+ messages in thread
From: Luca Fancellu @ 2024-03-12 13:03 UTC (permalink / raw)
To: xen-devel
Cc: Stefano Stabellini, Julien Grall, Bertrand Marquis, Michal Orzel,
Volodymyr Babchuk
Currently the memory footprint of the static shared memory feature
is impacting all the struct meminfo instances with memory space
that is not going to be used.
To solve this issue, rework the static shared memory extra
information linked to the memory bank to another structure,
struct shmem_membank_extra, and exploit the struct membank
padding to host a pointer to that structure in a union with the
enum membank_type, with this trick the 'struct membank' has the
same size with or without the static shared memory, given that
the 'type' and 'shmem_extra' are never used at the same time.
Afterwards, create a new structure 'struct shared_meminfo' which
has the same interface of 'struct meminfo', but requires less
banks and hosts the extra information for the static shared memory.
The fields 'bank' and 'extra' of this structure are meant to be
linked by the index (e.g. extra[idx] will have the information for
the bank[idx], for i=0..NR_SHMEM_BANKS), the convinient pointer
'shmem_extra' of 'struct membank' is then linked to the related
'extra' bank to ease the fruition when a function has access only
to the 'struct membanks common' of 'struct shared_meminfo'.
The last part of this work is to move the allocation of the
static shared memory banks from the 'reserved_mem' to a new
'shmem' member of the 'struct bootinfo'.
Change also the 'shm_mem' member type to be 'struct shared_meminfo'
in order to match the above changes and allow a memory space
reduction also in 'struct kernel_info'.
Signed-off-by: Luca Fancellu <luca.fancellu@arm.com>
---
xen/arch/arm/arm32/mmu/mm.c | 24 +++++++++
xen/arch/arm/arm64/mmu/mm.c | 2 +
xen/arch/arm/bootfdt.c | 1 +
xen/arch/arm/domain_build.c | 4 ++
xen/arch/arm/include/asm/kernel.h | 4 +-
xen/arch/arm/include/asm/setup.h | 41 +++++++++++++--
xen/arch/arm/include/asm/static-shmem.h | 8 +++
xen/arch/arm/setup.c | 25 ++++++++-
xen/arch/arm/static-shmem.c | 69 ++++++++++++++++++-------
9 files changed, 154 insertions(+), 24 deletions(-)
diff --git a/xen/arch/arm/arm32/mmu/mm.c b/xen/arch/arm/arm32/mmu/mm.c
index e6bb5d934c16..45e42b307e20 100644
--- a/xen/arch/arm/arm32/mmu/mm.c
+++ b/xen/arch/arm/arm32/mmu/mm.c
@@ -7,6 +7,7 @@
#include <xen/pfn.h>
#include <asm/fixmap.h>
#include <asm/static-memory.h>
+#include <asm/static-shmem.h>
static unsigned long opt_xenheap_megabytes __initdata;
integer_param("xenheap_megabytes", opt_xenheap_megabytes);
@@ -42,6 +43,9 @@ static paddr_t __init consider_modules(paddr_t s, paddr_t e,
int first_mod)
{
const struct membanks *reserved_mem = bootinfo_get_reserved_mem();
+#ifdef CONFIG_STATIC_SHM
+ const struct membanks *shmem = bootinfo_get_shmem();
+#endif
const struct bootmodules *mi = &bootinfo.modules;
int i;
int nr;
@@ -118,6 +122,25 @@ static paddr_t __init consider_modules(paddr_t s, paddr_t e,
return consider_modules(s, r_s, size, align, i + 1);
}
}
+
+#ifdef CONFIG_STATIC_SHM
+ nr += reserved_mem->nr_banks;
+ for ( ; i - nr < shmem->nr_banks; i++ )
+ {
+ paddr_t r_s = shmem->bank[i - nr].start;
+ paddr_t r_e = r_s + shmem->bank[i - nr].size;
+
+ if ( s < r_e && r_s < e )
+ {
+ r_e = consider_modules(r_e, e, size, align, i + 1);
+ if ( r_e )
+ return r_e;
+
+ return consider_modules(s, r_s, size, align, i + 1);
+ }
+ }
+#endif
+
return e;
}
@@ -294,6 +317,7 @@ void __init setup_mm(void)
mfn_to_maddr(directmap_mfn_end));
init_staticmem_pages();
+ init_sharedmem_pages();
}
/*
diff --git a/xen/arch/arm/arm64/mmu/mm.c b/xen/arch/arm/arm64/mmu/mm.c
index f8aaf4ac18be..293acb67e09c 100644
--- a/xen/arch/arm/arm64/mmu/mm.c
+++ b/xen/arch/arm/arm64/mmu/mm.c
@@ -6,6 +6,7 @@
#include <asm/setup.h>
#include <asm/static-memory.h>
+#include <asm/static-shmem.h>
/* Override macros from asm/page.h to make them work with mfn_t */
#undef virt_to_mfn
@@ -236,6 +237,7 @@ void __init setup_mm(void)
max_page = PFN_DOWN(ram_end);
init_staticmem_pages();
+ init_sharedmem_pages();
}
/*
diff --git a/xen/arch/arm/bootfdt.c b/xen/arch/arm/bootfdt.c
index ecbc80d6a112..f2344863062e 100644
--- a/xen/arch/arm/bootfdt.c
+++ b/xen/arch/arm/bootfdt.c
@@ -499,6 +499,7 @@ static void __init early_print_info(void)
mem_resv->bank[j].start,
mem_resv->bank[j].start + mem_resv->bank[j].size - 1);
}
+ early_print_info_shmem();
printk("\n");
for ( i = 0 ; i < cmds->nr_mods; i++ )
printk("CMDLINE[%"PRIpaddr"]:%s %s\n", cmds->cmdline[i].start,
diff --git a/xen/arch/arm/domain_build.c b/xen/arch/arm/domain_build.c
index d0f2ac6060eb..9fad9e8b2c40 100644
--- a/xen/arch/arm/domain_build.c
+++ b/xen/arch/arm/domain_build.c
@@ -864,6 +864,7 @@ static int __init add_ext_regions(unsigned long s_gfn, unsigned long e_gfn,
* regions we exclude every region assigned to Dom0 from the Host RAM:
* - domain RAM
* - reserved-memory
+ * - static shared memory
* - grant table space
*/
static int __init find_unallocated_memory(const struct kernel_info *kinfo,
@@ -873,6 +874,9 @@ static int __init find_unallocated_memory(const struct kernel_info *kinfo,
bootinfo_get_mem(),
kernel_info_get_mem(kinfo),
bootinfo_get_reserved_mem(),
+#ifdef CONFIG_STATIC_SHM
+ bootinfo_get_shmem(),
+#endif
};
struct rangeset *unalloc_mem;
paddr_t start, end;
diff --git a/xen/arch/arm/include/asm/kernel.h b/xen/arch/arm/include/asm/kernel.h
index 5785da985ccf..937ffcefc73f 100644
--- a/xen/arch/arm/include/asm/kernel.h
+++ b/xen/arch/arm/include/asm/kernel.h
@@ -40,7 +40,7 @@ struct kernel_info {
paddr_t unassigned_mem; /* RAM not (yet) assigned to a bank */
struct meminfo mem;
#ifdef CONFIG_STATIC_SHM
- struct meminfo shm_mem;
+ struct shared_meminfo shm_mem;
#endif
/* kernel entry point */
@@ -84,7 +84,7 @@ struct kernel_info {
(&(kinfo)->mem.common)
#ifdef CONFIG_STATIC_SHM
-#define KERNEL_INFO_SHM_MEM_INIT .shm_mem.common.max_banks = NR_MEM_BANKS,
+#define KERNEL_INFO_SHM_MEM_INIT .shm_mem.common.max_banks = NR_SHMEM_BANKS,
#else
#define KERNEL_INFO_SHM_MEM_INIT
#endif
diff --git a/xen/arch/arm/include/asm/setup.h b/xen/arch/arm/include/asm/setup.h
index a3e1dc8fdb6c..07011bd776da 100644
--- a/xen/arch/arm/include/asm/setup.h
+++ b/xen/arch/arm/include/asm/setup.h
@@ -9,6 +9,7 @@
#define MAX_FDT_SIZE SZ_2M
#define NR_MEM_BANKS 256
+#define NR_SHMEM_BANKS 32
#define MAX_MODULES 32 /* Current maximum useful modules */
@@ -46,14 +47,20 @@ enum membank_type {
/* Indicates the maximum number of characters(\0 included) for shm_id */
#define MAX_SHM_ID_LENGTH 16
+struct shmem_membank_extra {
+ char shm_id[MAX_SHM_ID_LENGTH];
+ unsigned int nr_shm_borrowers;
+};
+
struct membank {
paddr_t start;
paddr_t size;
- enum membank_type type;
+ union {
+ enum membank_type type;
#ifdef CONFIG_STATIC_SHM
- char shm_id[MAX_SHM_ID_LENGTH];
- unsigned int nr_shm_borrowers;
+ struct shmem_membank_extra *shmem_extra;
#endif
+ };
};
struct membanks {
@@ -67,6 +74,12 @@ struct meminfo {
struct membank bank[NR_MEM_BANKS];
};
+struct shared_meminfo {
+ struct membanks common;
+ struct membank bank[NR_SHMEM_BANKS];
+ struct shmem_membank_extra extra[NR_SHMEM_BANKS];
+};
+
/*
* The domU flag is set for kernels and ramdisks of "xen,domain" nodes.
* The purpose of the domU flag is to avoid getting confused in
@@ -109,6 +122,9 @@ struct bootinfo {
struct bootcmdlines cmdlines;
#ifdef CONFIG_ACPI
struct meminfo acpi;
+#endif
+#ifdef CONFIG_STATIC_SHM
+ struct shared_meminfo shmem;
#endif
bool static_heap;
};
@@ -119,11 +135,18 @@ struct bootinfo {
#define BOOTINFO_ACPI_INIT
#endif
+#ifdef CONFIG_STATIC_SHM
+#define BOOTINFO_SHMEM_INIT .shmem.common.max_banks = NR_SHMEM_BANKS,
+#else
+#define BOOTINFO_SHMEM_INIT
+#endif
+
#define BOOTINFO_INIT \
{ \
.mem.common.max_banks = NR_MEM_BANKS, \
.reserved_mem.common.max_banks = NR_MEM_BANKS, \
BOOTINFO_ACPI_INIT \
+ BOOTINFO_SHMEM_INIT \
}
struct map_range_data
@@ -158,6 +181,18 @@ static inline struct membanks *bootinfo_get_acpi(void)
}
#endif
+#ifdef CONFIG_STATIC_SHM
+static inline struct membanks *bootinfo_get_shmem(void)
+{
+ return &bootinfo.shmem.common;
+}
+
+static inline struct shmem_membank_extra *bootinfo_get_shmem_extra(void)
+{
+ return bootinfo.shmem.extra;
+}
+#endif
+
void copy_from_paddr(void *dst, paddr_t paddr, unsigned long len);
size_t estimate_efi_size(unsigned int mem_nr_banks);
diff --git a/xen/arch/arm/include/asm/static-shmem.h b/xen/arch/arm/include/asm/static-shmem.h
index 108cedb55a9f..c6fac9906656 100644
--- a/xen/arch/arm/include/asm/static-shmem.h
+++ b/xen/arch/arm/include/asm/static-shmem.h
@@ -25,6 +25,10 @@ static inline int process_shm_chosen(struct domain *d,
int process_shm_node(const void *fdt, int node, uint32_t address_cells,
uint32_t size_cells);
+void early_print_info_shmem(void);
+
+void init_sharedmem_pages(void);
+
#else /* !CONFIG_STATIC_SHM */
static inline int make_resv_memory_node(const struct domain *d,
@@ -53,6 +57,10 @@ static inline int process_shm_node(const void *fdt, int node,
return -EINVAL;
}
+static inline void early_print_info_shmem(void) {};
+
+static inline void init_sharedmem_pages(void) {};
+
#endif /* CONFIG_STATIC_SHM */
#endif /* __ASM_STATIC_SHMEM_H_ */
diff --git a/xen/arch/arm/setup.c b/xen/arch/arm/setup.c
index cc719d508d63..111172a8c4b1 100644
--- a/xen/arch/arm/setup.c
+++ b/xen/arch/arm/setup.c
@@ -208,6 +208,9 @@ static void __init dt_unreserved_regions(paddr_t s, paddr_t e,
unsigned int first)
{
const struct membanks *reserved_mem = bootinfo_get_reserved_mem();
+#ifdef CONFIG_STATIC_SHM
+ const struct membanks *shmem = bootinfo_get_shmem();
+#endif
unsigned int i, nr;
int rc;
@@ -258,6 +261,22 @@ static void __init dt_unreserved_regions(paddr_t s, paddr_t e,
}
}
+#ifdef CONFIG_STATIC_SHM
+ nr += reserved_mem->nr_banks;
+ for ( ; i - nr < shmem->nr_banks; i++ )
+ {
+ paddr_t r_s = shmem->bank[i - nr].start;
+ paddr_t r_e = r_s + shmem->bank[i - nr].size;
+
+ if ( s < r_e && r_s < e )
+ {
+ dt_unreserved_regions(r_e, e, cb, i + 1);
+ dt_unreserved_regions(s, r_s, cb, i + 1);
+ return;
+ }
+ }
+#endif
+
cb(s, e);
}
@@ -344,13 +363,17 @@ bool __init check_reserved_regions_overlap(paddr_t region_start,
bootinfo_get_reserved_mem(),
#ifdef CONFIG_ACPI
bootinfo_get_acpi(),
+#endif
+#ifdef CONFIG_STATIC_SHM
+ bootinfo_get_shmem(),
#endif
};
unsigned int i;
/*
* Check if input region is overlapping with reserved memory banks or
- * ACPI EfiACPIReclaimMemory (when ACPI feature is enabled)
+ * ACPI EfiACPIReclaimMemory (when ACPI feature is enabled) or static
+ * 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) )
diff --git a/xen/arch/arm/static-shmem.c b/xen/arch/arm/static-shmem.c
index 8b7da952be6e..6143f52cb991 100644
--- a/xen/arch/arm/static-shmem.c
+++ b/xen/arch/arm/static-shmem.c
@@ -4,29 +4,30 @@
#include <xen/sched.h>
#include <asm/domain_build.h>
+#include <asm/static-memory.h>
#include <asm/static-shmem.h>
static int __init acquire_nr_borrower_domain(struct domain *d,
paddr_t pbase, paddr_t psize,
unsigned long *nr_borrowers)
{
- const struct membanks *reserved_mem = bootinfo_get_reserved_mem();
+ const struct membanks *shmem = bootinfo_get_shmem();
unsigned int bank;
/* Iterate reserved memory to find requested shm bank. */
- for ( bank = 0 ; bank < reserved_mem->nr_banks; bank++ )
+ for ( bank = 0 ; bank < shmem->nr_banks; bank++ )
{
- paddr_t bank_start = reserved_mem->bank[bank].start;
- paddr_t bank_size = reserved_mem->bank[bank].size;
+ paddr_t bank_start = shmem->bank[bank].start;
+ paddr_t bank_size = shmem->bank[bank].size;
if ( (pbase == bank_start) && (psize == bank_size) )
break;
}
- if ( bank == reserved_mem->nr_banks )
+ if ( bank == shmem->nr_banks )
return -ENOENT;
- *nr_borrowers = reserved_mem->bank[bank].nr_shm_borrowers;
+ *nr_borrowers = shmem->bank[bank].shmem_extra->nr_shm_borrowers;
return 0;
}
@@ -158,16 +159,22 @@ static int __init assign_shared_memory(struct domain *d,
return ret;
}
-static int __init append_shm_bank_to_domain(struct membanks *shm_mem,
- paddr_t start, paddr_t size,
- const char *shm_id)
+static int __init
+append_shm_bank_to_domain(struct shared_meminfo *kinfo_shm_mem, paddr_t start,
+ paddr_t size, const char *shm_id)
{
+ struct membanks *shm_mem = &kinfo_shm_mem->common;
+ struct shmem_membank_extra *shm_mem_extra;
+
if ( shm_mem->nr_banks >= shm_mem->max_banks )
return -ENOMEM;
+ shm_mem_extra = &kinfo_shm_mem->extra[shm_mem->nr_banks];
+
shm_mem->bank[shm_mem->nr_banks].start = start;
shm_mem->bank[shm_mem->nr_banks].size = size;
- safe_strcpy(shm_mem->bank[shm_mem->nr_banks].shm_id, shm_id);
+ safe_strcpy(shm_mem_extra->shm_id, shm_id);
+ shm_mem->bank[shm_mem->nr_banks].shmem_extra = shm_mem_extra;
shm_mem->nr_banks++;
return 0;
@@ -270,7 +277,7 @@ int __init process_shm(struct domain *d, struct kernel_info *kinfo,
* Record static shared memory region info for later setting
* up shm-node in guest device tree.
*/
- ret = append_shm_bank_to_domain(&kinfo->shm_mem.common, gbase, psize,
+ ret = append_shm_bank_to_domain(&kinfo->shm_mem, gbase, psize,
shm_id);
if ( ret )
return ret;
@@ -324,7 +331,8 @@ static int __init make_shm_memory_node(const struct domain *d, void *fdt,
dt_dprintk("Shared memory bank %u: %#"PRIx64"->%#"PRIx64"\n",
i, start, start + size);
- res = fdt_property_string(fdt, "xen,id", mem->bank[i].shm_id);
+ res = fdt_property_string(fdt, "xen,id",
+ mem->bank[i].shmem_extra->shm_id);
if ( res )
return res;
@@ -352,7 +360,8 @@ int __init process_shm_node(const void *fdt, int node, uint32_t address_cells,
const struct fdt_property *prop, *prop_id, *prop_role;
const __be32 *cell;
paddr_t paddr, gaddr, size, end;
- struct membanks *mem = bootinfo_get_reserved_mem();
+ struct membanks *mem = bootinfo_get_shmem();
+ struct shmem_membank_extra *shmem_extra = bootinfo_get_shmem_extra();
unsigned int i;
int len;
bool owner = false;
@@ -441,7 +450,8 @@ int __init process_shm_node(const void *fdt, int node, uint32_t address_cells,
*/
if ( paddr == mem->bank[i].start && size == mem->bank[i].size )
{
- if ( strncmp(shm_id, mem->bank[i].shm_id, MAX_SHM_ID_LENGTH) == 0 )
+ if ( strncmp(shm_id, shmem_extra[i].shm_id,
+ MAX_SHM_ID_LENGTH) == 0 )
break;
else
{
@@ -450,7 +460,8 @@ int __init process_shm_node(const void *fdt, int node, uint32_t address_cells,
return -EINVAL;
}
}
- else if ( strncmp(shm_id, mem->bank[i].shm_id, MAX_SHM_ID_LENGTH) != 0 )
+ else if ( strncmp(shm_id, shmem_extra[i].shm_id,
+ MAX_SHM_ID_LENGTH) != 0 )
continue;
else
{
@@ -468,10 +479,10 @@ int __init process_shm_node(const void *fdt, int node, uint32_t address_cells,
return -EINVAL;
/* Static shared memory shall be reserved from any other use. */
- safe_strcpy(mem->bank[mem->nr_banks].shm_id, shm_id);
+ safe_strcpy(shmem_extra[mem->nr_banks].shm_id, shm_id);
mem->bank[mem->nr_banks].start = paddr;
mem->bank[mem->nr_banks].size = size;
- mem->bank[mem->nr_banks].type = MEMBANK_STATIC_DOMAIN;
+ mem->bank[mem->nr_banks].shmem_extra = &shmem_extra[mem->nr_banks];
mem->nr_banks++;
}
else
@@ -485,7 +496,7 @@ int __init process_shm_node(const void *fdt, int node, uint32_t address_cells,
* to calculate the reference count.
*/
if ( !owner )
- mem->bank[i].nr_shm_borrowers++;
+ shmem_extra[i].nr_shm_borrowers++;
return 0;
}
@@ -531,6 +542,28 @@ int __init make_resv_memory_node(const struct domain *d,
return res;
}
+void __init early_print_info_shmem(void)
+{
+ const struct membanks *shmem = bootinfo_get_shmem();
+ unsigned int bank;
+
+ for ( bank = 0; bank < shmem->nr_banks; bank++ )
+ {
+ printk(" SHMEM[%u]: %"PRIpaddr" - %"PRIpaddr"\n", bank,
+ shmem->bank[bank].start,
+ shmem->bank[bank].start + shmem->bank[bank].size - 1);
+ }
+}
+
+void __init init_sharedmem_pages(void)
+{
+ const struct membanks *shmem = bootinfo_get_shmem();
+ unsigned int bank;
+
+ for ( bank = 0 ; bank < shmem->nr_banks; bank++ )
+ init_staticmem_bank(&shmem->bank[bank]);
+}
+
/*
* Local variables:
* mode: C
--
2.34.1
^ permalink raw reply related [flat|nested] 32+ messages in thread
* [PATCH 09/11] xen/arm: remove shm holes for extended regions
2024-03-12 13:03 [PATCH 00/11] Static shared memory followup v2 - pt1 Luca Fancellu
` (7 preceding siblings ...)
2024-03-12 13:03 ` [PATCH 08/11] xen/arm: Reduce struct membank size on static shared memory Luca Fancellu
@ 2024-03-12 13:03 ` Luca Fancellu
2024-03-22 15:09 ` Michal Orzel
2024-03-12 13:03 ` [PATCH 10/11] xen/arm: fix duplicate /reserved-memory node in Dom0 Luca Fancellu
2024-03-12 13:03 ` [PATCH 11/11] xen/arm: List static shared memory regions as /memory nodes Luca Fancellu
10 siblings, 1 reply; 32+ messages in thread
From: Luca Fancellu @ 2024-03-12 13:03 UTC (permalink / raw)
To: xen-devel
Cc: Penny Zheng, Stefano Stabellini, Julien Grall, Bertrand Marquis,
Michal Orzel, Volodymyr Babchuk, Penny Zheng
From: Penny Zheng <Penny.Zheng@arm.com>
Static shared memory acts as reserved memory in guest, so it shall be
excluded from extended regions.
Extended regions are taken care of under three different scenarios:
normal DomU, direct-map domain with iommu on, and direct-map domain
with iommu off.
For normal DomU, we create a new function "remove_shm_holes_for_domU",
to firstly transfer original outputs into the format of
"struct rangeset", then use "remove_shm_from_rangeset" to remove static
shm from them.
For direct-map domain with iommu on, after we get guest shm info from "kinfo",
we use "remove_shm_from_rangeset" to remove static shm.
For direct-map domain with iommu off, as static shm has already been taken
care of through reserved memory banks, we do nothing.
Signed-off-by: Penny Zheng <penny.zheng@arm.com>
Signed-off-by: Luca Fancellu <luca.fancellu@arm.com>
---
v1:
- Rework of https://patchwork.kernel.org/project/xen-devel/patch/20231206090623.1932275-8-Penny.Zheng@arm.com/
---
xen/arch/arm/domain_build.c | 16 ++++-
xen/arch/arm/include/asm/domain_build.h | 2 +
xen/arch/arm/include/asm/static-shmem.h | 18 ++++++
xen/arch/arm/static-shmem.c | 86 +++++++++++++++++++++++++
4 files changed, 119 insertions(+), 3 deletions(-)
diff --git a/xen/arch/arm/domain_build.c b/xen/arch/arm/domain_build.c
index 9fad9e8b2c40..740c483ea2db 100644
--- a/xen/arch/arm/domain_build.c
+++ b/xen/arch/arm/domain_build.c
@@ -817,8 +817,8 @@ int __init make_memory_node(const struct domain *d,
return res;
}
-static int __init add_ext_regions(unsigned long s_gfn, unsigned long e_gfn,
- void *data)
+int __init add_ext_regions(unsigned long s_gfn, unsigned long e_gfn,
+ void *data)
{
struct membanks *ext_regions = data;
paddr_t start, size;
@@ -969,6 +969,8 @@ static int __init handle_pci_range(const struct dt_device_node *dev,
* - MMIO
* - Host RAM
* - PCI aperture
+ * - Static shared memory regions, which are described by special property
+ * "xen,domain-shared-memory-v1"
*/
static int __init find_memory_holes(const struct kernel_info *kinfo,
struct membanks *ext_regions)
@@ -985,6 +987,11 @@ static int __init find_memory_holes(const struct kernel_info *kinfo,
if ( !mem_holes )
return -ENOMEM;
+ /* Remove static shared memory regions */
+ res = remove_shm_from_rangeset(kinfo, mem_holes);
+ if ( res )
+ goto out;
+
/* Start with maximum possible addressable physical memory range */
start = 0;
end = (1ULL << p2m_ipa_bits) - 1;
@@ -1089,7 +1096,10 @@ static int __init find_domU_holes(const struct kernel_info *kinfo,
res = 0;
}
- return res;
+ if ( res )
+ return res;
+
+ return remove_shm_holes_for_domU(kinfo, ext_regions);
}
int __init make_hypervisor_node(struct domain *d,
diff --git a/xen/arch/arm/include/asm/domain_build.h b/xen/arch/arm/include/asm/domain_build.h
index a6f276cc4263..026d975da28e 100644
--- a/xen/arch/arm/include/asm/domain_build.h
+++ b/xen/arch/arm/include/asm/domain_build.h
@@ -51,6 +51,8 @@ static inline int prepare_acpi(struct domain *d, struct kernel_info *kinfo)
int prepare_acpi(struct domain *d, struct kernel_info *kinfo);
#endif
+int add_ext_regions(unsigned long s_gfn, unsigned long e_gfn, void *data);
+
#endif
/*
diff --git a/xen/arch/arm/include/asm/static-shmem.h b/xen/arch/arm/include/asm/static-shmem.h
index c6fac9906656..2f70aed53ac7 100644
--- a/xen/arch/arm/include/asm/static-shmem.h
+++ b/xen/arch/arm/include/asm/static-shmem.h
@@ -29,6 +29,12 @@ void early_print_info_shmem(void);
void init_sharedmem_pages(void);
+int remove_shm_from_rangeset(const struct kernel_info *kinfo,
+ struct rangeset *rangeset);
+
+int remove_shm_holes_for_domU(const struct kernel_info *kinfo,
+ struct membanks *ext_regions);
+
#else /* !CONFIG_STATIC_SHM */
static inline int make_resv_memory_node(const struct domain *d,
@@ -61,6 +67,18 @@ static inline void early_print_info_shmem(void) {};
static inline void init_sharedmem_pages(void) {};
+static inline int remove_shm_from_rangeset(const struct kernel_info *kinfo,
+ struct rangeset *rangeset)
+{
+ return 0;
+}
+
+static inline int remove_shm_holes_for_domU(const struct kernel_info *kinfo,
+ struct membanks *ext_regions)
+{
+ return 0;
+}
+
#endif /* CONFIG_STATIC_SHM */
#endif /* __ASM_STATIC_SHMEM_H_ */
diff --git a/xen/arch/arm/static-shmem.c b/xen/arch/arm/static-shmem.c
index 6143f52cb991..b3e2105dd3f2 100644
--- a/xen/arch/arm/static-shmem.c
+++ b/xen/arch/arm/static-shmem.c
@@ -1,6 +1,7 @@
/* SPDX-License-Identifier: GPL-2.0-only */
#include <xen/libfdt/libfdt.h>
+#include <xen/rangeset.h>
#include <xen/sched.h>
#include <asm/domain_build.h>
@@ -564,6 +565,91 @@ void __init init_sharedmem_pages(void)
init_staticmem_bank(&shmem->bank[bank]);
}
+int __init remove_shm_from_rangeset(const struct kernel_info *kinfo,
+ struct rangeset *rangeset)
+{
+ const struct membanks *shm_mem = &kinfo->shm_mem.common;
+ unsigned int i;
+
+ /* Remove static shared memory regions */
+ for ( i = 0; i < shm_mem->nr_banks; i++ )
+ {
+ paddr_t start, end;
+ int res;
+
+ start = shm_mem->bank[i].start;
+ end = shm_mem->bank[i].start + shm_mem->bank[i].size - 1;
+ res = rangeset_remove_range(rangeset, start, end);
+ if ( res )
+ {
+ printk(XENLOG_ERR "Failed to remove: %#"PRIpaddr"->%#"PRIpaddr"\n",
+ start, end);
+ return -EINVAL;
+ }
+ }
+
+ return 0;
+}
+
+int __init remove_shm_holes_for_domU(const struct kernel_info *kinfo,
+ struct membanks *ext_regions)
+{
+ const struct membanks *shm_mem = &kinfo->shm_mem.common;
+ struct rangeset *guest_holes;
+ unsigned int i;
+ paddr_t start;
+ paddr_t end;
+ int res;
+
+ /* No static shared memory region. */
+ if ( shm_mem->nr_banks == 0 )
+ return 0;
+
+ dt_dprintk("Remove static shared memory holes for extended regions of DomU\n");
+
+ guest_holes = rangeset_new(NULL, NULL, 0);
+ if ( !guest_holes )
+ return -ENOMEM;
+
+ /* Copy extended regions sets into the rangeset */
+ for ( i = 0; i < ext_regions->nr_banks; i++ )
+ {
+ start = ext_regions->bank[i].start;
+ end = start + ext_regions->bank[i].size - 1;
+
+ res = rangeset_add_range(guest_holes, start, end);
+ if ( res )
+ {
+ printk(XENLOG_ERR "Failed to add: %#"PRIpaddr"->%#"PRIpaddr"\n",
+ start, end);
+ goto out;
+ }
+ }
+
+ /* Remove static shared memory regions */
+ res = remove_shm_from_rangeset(kinfo, guest_holes);
+ if ( res )
+ goto out;
+
+ i = ext_regions->nr_banks - 1;
+ start = ext_regions->bank[0].start;
+ end = ext_regions->bank[i].start + ext_regions->bank[i].size - 1;
+
+ /* Reset original extended regions to hold new value */
+ ext_regions->nr_banks = 0;
+ res = rangeset_report_ranges(guest_holes, start, end, add_ext_regions,
+ ext_regions);
+ if ( res )
+ ext_regions->nr_banks = 0;
+ else if ( !ext_regions->nr_banks )
+ res = -ENOENT;
+
+ out:
+ rangeset_destroy(guest_holes);
+
+ return res;
+}
+
/*
* Local variables:
* mode: C
--
2.34.1
^ permalink raw reply related [flat|nested] 32+ messages in thread
* [PATCH 10/11] xen/arm: fix duplicate /reserved-memory node in Dom0
2024-03-12 13:03 [PATCH 00/11] Static shared memory followup v2 - pt1 Luca Fancellu
` (8 preceding siblings ...)
2024-03-12 13:03 ` [PATCH 09/11] xen/arm: remove shm holes for extended regions Luca Fancellu
@ 2024-03-12 13:03 ` Luca Fancellu
2024-03-25 8:09 ` Michal Orzel
2024-03-12 13:03 ` [PATCH 11/11] xen/arm: List static shared memory regions as /memory nodes Luca Fancellu
10 siblings, 1 reply; 32+ messages in thread
From: Luca Fancellu @ 2024-03-12 13:03 UTC (permalink / raw)
To: xen-devel
Cc: Penny Zheng, Stefano Stabellini, Julien Grall, Bertrand Marquis,
Michal Orzel, Volodymyr Babchuk, Penny Zheng
From: Penny Zheng <Penny.Zheng@arm.com>
In case there is a /reserved-memory node already present in the host dtb,
current Xen codes would create yet another /reserved-memory node when
the static shared memory feature is enabled and static shared memory
region are present, this would result in an incorrect device tree
generation and guest would not be able to detect the static shared memory
region.
Avoid this issue checking the presence of the /reserved-memory node and
appending the nodes instead of generating a duplicate /reserved-memory.
Signed-off-by: Penny Zheng <penny.zheng@arm.com>
Signed-off-by: Luca Fancellu <luca.fancellu@arm.com>
---
v1:
- Rework of https://patchwork.kernel.org/project/xen-devel/patch/20231206090623.1932275-11-Penny.Zheng@arm.com/
---
xen/arch/arm/domain_build.c | 23 ++++++++++++++++++++---
xen/arch/arm/include/asm/static-shmem.h | 11 +++++++++++
xen/arch/arm/static-shmem.c | 12 +++++++-----
3 files changed, 38 insertions(+), 8 deletions(-)
diff --git a/xen/arch/arm/domain_build.c b/xen/arch/arm/domain_build.c
index 740c483ea2db..575e906d81a6 100644
--- a/xen/arch/arm/domain_build.c
+++ b/xen/arch/arm/domain_build.c
@@ -1620,6 +1620,7 @@ static int __init handle_node(struct domain *d, struct kernel_info *kinfo,
DT_MATCH_PATH("/hypervisor"),
{ /* sentinel */ },
};
+ static __initdata bool res_mem_node_found = false;
struct dt_device_node *child;
int res, i, nirq, irq_id;
const char *name;
@@ -1714,6 +1715,19 @@ static int __init handle_node(struct domain *d, struct kernel_info *kinfo,
if ( res )
return res;
+ if ( dt_node_path_is_equal(node, "/reserved-memory") )
+ {
+ res_mem_node_found = true;
+ /*
+ * Avoid duplicate /reserved-memory nodes in Device Tree, so list the
+ * static shared memory nodes there.
+ */
+ res = make_shm_memory_node(d, kinfo, dt_n_addr_cells(node),
+ dt_n_size_cells(node));
+ if ( res )
+ return res;
+ }
+
for ( child = node->child; child != NULL; child = child->sibling )
{
res = handle_node(d, kinfo, child, p2mt);
@@ -1766,9 +1780,12 @@ static int __init handle_node(struct domain *d, struct kernel_info *kinfo,
return res;
}
- res = make_resv_memory_node(d, kinfo, addrcells, sizecells);
- if ( res )
- return res;
+ if ( !res_mem_node_found )
+ {
+ res = make_resv_memory_node(d, kinfo, addrcells, sizecells);
+ if ( res )
+ return res;
+ }
}
res = fdt_end_node(kinfo->fdt);
diff --git a/xen/arch/arm/include/asm/static-shmem.h b/xen/arch/arm/include/asm/static-shmem.h
index 2f70aed53ac7..d28b9540d49b 100644
--- a/xen/arch/arm/include/asm/static-shmem.h
+++ b/xen/arch/arm/include/asm/static-shmem.h
@@ -35,6 +35,10 @@ int remove_shm_from_rangeset(const struct kernel_info *kinfo,
int remove_shm_holes_for_domU(const struct kernel_info *kinfo,
struct membanks *ext_regions);
+int make_shm_memory_node(const struct domain *d,
+ const struct kernel_info *kinfo, int addrcells,
+ int sizecells);
+
#else /* !CONFIG_STATIC_SHM */
static inline int make_resv_memory_node(const struct domain *d,
@@ -79,6 +83,13 @@ static inline int remove_shm_holes_for_domU(const struct kernel_info *kinfo,
return 0;
}
+static inline int make_shm_memory_node(const struct domain *d,
+ const struct kernel_info *kinfo,
+ int addrcells, int sizecells)
+{
+ return 0;
+}
+
#endif /* CONFIG_STATIC_SHM */
#endif /* __ASM_STATIC_SHMEM_H_ */
diff --git a/xen/arch/arm/static-shmem.c b/xen/arch/arm/static-shmem.c
index b3e2105dd3f2..67d5fa3b5d25 100644
--- a/xen/arch/arm/static-shmem.c
+++ b/xen/arch/arm/static-shmem.c
@@ -287,15 +287,17 @@ int __init process_shm(struct domain *d, struct kernel_info *kinfo,
return 0;
}
-static int __init make_shm_memory_node(const struct domain *d, void *fdt,
- int addrcells, int sizecells,
- const struct membanks *mem)
+int __init make_shm_memory_node(const struct domain *d,
+ const struct kernel_info *kinfo, int addrcells,
+ int sizecells)
{
+ const struct membanks *mem = &kinfo->shm_mem.common;
+ void *fdt = kinfo->fdt;
unsigned int i = 0;
int res = 0;
if ( mem->nr_banks == 0 )
- return -ENOENT;
+ return 0;
/*
* For each shared memory region, a range is exposed under
@@ -534,7 +536,7 @@ int __init make_resv_memory_node(const struct domain *d,
if ( res )
return res;
- res = make_shm_memory_node(d, fdt, addrcells, sizecells, mem);
+ res = make_shm_memory_node(d, kinfo, addrcells, sizecells);
if ( res )
return res;
--
2.34.1
^ permalink raw reply related [flat|nested] 32+ messages in thread
* [PATCH 11/11] xen/arm: List static shared memory regions as /memory nodes
2024-03-12 13:03 [PATCH 00/11] Static shared memory followup v2 - pt1 Luca Fancellu
` (9 preceding siblings ...)
2024-03-12 13:03 ` [PATCH 10/11] xen/arm: fix duplicate /reserved-memory node in Dom0 Luca Fancellu
@ 2024-03-12 13:03 ` Luca Fancellu
2024-03-25 8:58 ` Michal Orzel
10 siblings, 1 reply; 32+ messages in thread
From: Luca Fancellu @ 2024-03-12 13:03 UTC (permalink / raw)
To: xen-devel
Cc: Stefano Stabellini, Julien Grall, Bertrand Marquis, Michal Orzel,
Volodymyr Babchuk
Currently Xen is not exporting the static shared memory regions
to the device tree as /memory node, this commit is fixing this
issue.
Signed-off-by: Luca Fancellu <luca.fancellu@arm.com>
---
xen/arch/arm/dom0less-build.c | 5 +++
xen/arch/arm/domain_build.c | 7 +++-
xen/arch/arm/include/asm/static-shmem.h | 5 ++-
xen/arch/arm/static-shmem.c | 54 +++++++++++++++----------
4 files changed, 47 insertions(+), 24 deletions(-)
diff --git a/xen/arch/arm/dom0less-build.c b/xen/arch/arm/dom0less-build.c
index fe2a771d4984..0892020f21a0 100644
--- a/xen/arch/arm/dom0less-build.c
+++ b/xen/arch/arm/dom0less-build.c
@@ -647,6 +647,11 @@ static int __init prepare_dtb_domU(struct domain *d, struct kernel_info *kinfo)
if ( ret )
goto err;
+ /* List static shared memory regions as /memory@<address> nodes */
+ ret = make_shm_memory_node(d, kinfo, addrcells, sizecells, false);
+ if ( ret )
+ return ret;
+
ret = make_resv_memory_node(d, kinfo, addrcells, sizecells);
if ( ret )
goto err;
diff --git a/xen/arch/arm/domain_build.c b/xen/arch/arm/domain_build.c
index 575e906d81a6..bd7716cd5829 100644
--- a/xen/arch/arm/domain_build.c
+++ b/xen/arch/arm/domain_build.c
@@ -1723,7 +1723,7 @@ static int __init handle_node(struct domain *d, struct kernel_info *kinfo,
* static shared memory nodes there.
*/
res = make_shm_memory_node(d, kinfo, dt_n_addr_cells(node),
- dt_n_size_cells(node));
+ dt_n_size_cells(node), true);
if ( res )
return res;
}
@@ -1780,6 +1780,11 @@ static int __init handle_node(struct domain *d, struct kernel_info *kinfo,
return res;
}
+ /* List static shared memory regions as /memory@<address> nodes */
+ res = make_shm_memory_node(d, kinfo, addrcells, sizecells, false);
+ if ( res )
+ return res;
+
if ( !res_mem_node_found )
{
res = make_resv_memory_node(d, kinfo, addrcells, sizecells);
diff --git a/xen/arch/arm/include/asm/static-shmem.h b/xen/arch/arm/include/asm/static-shmem.h
index d28b9540d49b..c118bbb1c43b 100644
--- a/xen/arch/arm/include/asm/static-shmem.h
+++ b/xen/arch/arm/include/asm/static-shmem.h
@@ -37,7 +37,7 @@ int remove_shm_holes_for_domU(const struct kernel_info *kinfo,
int make_shm_memory_node(const struct domain *d,
const struct kernel_info *kinfo, int addrcells,
- int sizecells);
+ int sizecells, bool is_resv_mem_node);
#else /* !CONFIG_STATIC_SHM */
@@ -85,7 +85,8 @@ static inline int remove_shm_holes_for_domU(const struct kernel_info *kinfo,
static inline int make_shm_memory_node(const struct domain *d,
const struct kernel_info *kinfo,
- int addrcells, int sizecells)
+ int addrcells, int sizecells,
+ bool is_resv_mem_node)
{
return 0;
}
diff --git a/xen/arch/arm/static-shmem.c b/xen/arch/arm/static-shmem.c
index 67d5fa3b5d25..cdaf4485c934 100644
--- a/xen/arch/arm/static-shmem.c
+++ b/xen/arch/arm/static-shmem.c
@@ -289,7 +289,7 @@ int __init process_shm(struct domain *d, struct kernel_info *kinfo,
int __init make_shm_memory_node(const struct domain *d,
const struct kernel_info *kinfo, int addrcells,
- int sizecells)
+ int sizecells, bool is_resv_mem_node)
{
const struct membanks *mem = &kinfo->shm_mem.common;
void *fdt = kinfo->fdt;
@@ -300,11 +300,15 @@ int __init make_shm_memory_node(const struct domain *d,
return 0;
/*
- * For each shared memory region, a range is exposed under
- * the /reserved-memory node as a child node. Each range sub-node is
- * named xen-shmem@<address>.
+ * When is_resv_mem_node is true, it means this function is called to
+ * create nodes under /reserved-memory, so for each shared memory region, a
+ * range is exposed under the /reserved-memory node as a child node. Each
+ * range sub-node is named xen-shmem@<address>.
+ * Otherwise the function is called under / and will create
+ * /memory@<address> nodes for each static shared memory region.
*/
- dt_dprintk("Create xen-shmem node\n");
+ dt_dprintk("Create static shared memory %s nodes\n",
+ is_resv_mem_node ? "/reserved-memory/xen-shmem" : "/memory");
for ( ; i < mem->nr_banks; i++ )
{
@@ -316,11 +320,16 @@ int __init make_shm_memory_node(const struct domain *d,
__be32 *cells;
unsigned int len = (addrcells + sizecells) * sizeof(__be32);
- res = domain_fdt_begin_node(fdt, "xen-shmem", mem->bank[i].start);
+ res = domain_fdt_begin_node(fdt,
+ is_resv_mem_node ? "xen-shmem" : "memory",
+ mem->bank[i].start);
if ( res )
return res;
- res = fdt_property(fdt, "compatible", compat, sizeof(compat));
+ if ( is_resv_mem_node )
+ res = fdt_property(fdt, "compatible", compat, sizeof(compat));
+ else
+ res = fdt_property_string(fdt, "device_type", "memory");
if ( res )
return res;
@@ -334,20 +343,23 @@ int __init make_shm_memory_node(const struct domain *d,
dt_dprintk("Shared memory bank %u: %#"PRIx64"->%#"PRIx64"\n",
i, start, start + size);
- res = fdt_property_string(fdt, "xen,id",
- mem->bank[i].shmem_extra->shm_id);
- if ( res )
- return res;
+ if ( is_resv_mem_node )
+ {
+ res = fdt_property_string(fdt, "xen,id",
+ mem->bank[i].shmem_extra->shm_id);
+ if ( res )
+ return res;
- /*
- * TODO:
- * - xen,offset: (borrower VMs only)
- * 64 bit integer offset within the owner virtual machine's shared
- * memory region used for the mapping in the borrower VM
- */
- res = fdt_property_u64(fdt, "xen,offset", 0);
- if ( res )
- return res;
+ /*
+ * TODO:
+ * - xen,offset: (borrower VMs only)
+ * 64 bit integer offset within the owner virtual machine's shared
+ * memory region used for the mapping in the borrower VM
+ */
+ res = fdt_property_u64(fdt, "xen,offset", 0);
+ if ( res )
+ return res;
+ }
res = fdt_end_node(fdt);
if ( res )
@@ -536,7 +548,7 @@ int __init make_resv_memory_node(const struct domain *d,
if ( res )
return res;
- res = make_shm_memory_node(d, kinfo, addrcells, sizecells);
+ res = make_shm_memory_node(d, kinfo, addrcells, sizecells, true);
if ( res )
return res;
--
2.34.1
^ permalink raw reply related [flat|nested] 32+ messages in thread
* Re: [PATCH 02/11] xen/arm: avoid repetitive checking in process_shm_node
2024-03-12 13:03 ` [PATCH 02/11] xen/arm: avoid repetitive checking in process_shm_node Luca Fancellu
@ 2024-03-19 10:57 ` Michal Orzel
0 siblings, 0 replies; 32+ messages in thread
From: Michal Orzel @ 2024-03-19 10:57 UTC (permalink / raw)
To: Luca Fancellu, xen-devel
Cc: Penny Zheng, Stefano Stabellini, Julien Grall, Bertrand Marquis,
Volodymyr Babchuk
Hi Luca,
On 12/03/2024 14:03, Luca Fancellu wrote:
>
>
> From: Penny Zheng <Penny.Zheng@arm.com>
>
> Putting overlap and overflow checking in the loop is causing repetitive
> operation, so this commit extracts both checking outside the loop.
>
> Signed-off-by: Penny Zheng <penny.zheng@arm.com>
> Signed-off-by: Luca Fancellu <luca.fancellu@arm.com>
> ---
> v1:
> - Rework of https://patchwork.kernel.org/project/xen-devel/patch/20231206090623.1932275-3-Penny.Zheng@arm.com/
> - use strncmp to match the branch above
I don't understand why we need strncmp if we already validated that shm_id is NULL terminated within MAX_SHM_ID_LENGTH
at the beginning of the function with strnlen.
Other than that:
Reviewed-by: Michal Orzel <michal.orzel@amd.com>
~Michal
^ permalink raw reply [flat|nested] 32+ messages in thread
* Re: [PATCH 03/11] xen/arm: Introduce a generic way to access memory bank structures
2024-03-12 13:03 ` [PATCH 03/11] xen/arm: Introduce a generic way to access memory bank structures Luca Fancellu
@ 2024-03-19 13:10 ` Michal Orzel
2024-03-19 13:30 ` Luca Fancellu
2024-03-20 9:30 ` Julien Grall
0 siblings, 2 replies; 32+ messages in thread
From: Michal Orzel @ 2024-03-19 13:10 UTC (permalink / raw)
To: Luca Fancellu, xen-devel
Cc: Stefano Stabellini, Julien Grall, Bertrand Marquis, Volodymyr Babchuk
Hi Luca,
On 12/03/2024 14:03, Luca Fancellu wrote:
>
>
> Currently the 'stuct meminfo' is defining a static defined array of
> 'struct membank' of NR_MEM_BANKS elements, some feature like
> shared memory don't require such amount of memory allocation but
> might want to reuse existing code to manipulate this kind of
> structure that is just as 'struct meminfo' but less bulky.
>
> For this reason introduce a generic way to access this kind of
> structure using a new stucture 'struct membanks', which implements
s/stucture/structure
> all the fields needed by a structure related to memory banks
> without the need to specify at build time the size of the
> 'struct membank' array.
Might be beneficial here to mention the use of FAM.
>
> Modify 'struct meminfo' to implement the field related to the new
> introduced structure, given the change all usage of this structure
> are updated in this way:
> - code accessing bootinfo.{mem,reserved_mem,acpi} field now uses
> 3 new introduced static inline helpers to access the new field
> of 'struct meminfo' named 'common'.
> - code accessing 'struct kernel_info *' member 'mem' now use the
> new introduced macro 'kernel_info_get_mem(...)' to access the
> new field of 'struct meminfo' named 'common'.
>
> Constify pointers where needed.
>
> Suggested-by: Julien Grall <julien@xen.org>
> Signed-off-by: Luca Fancellu <luca.fancellu@arm.com>
> ---
> xen/arch/arm/acpi/domain_build.c | 6 +-
> xen/arch/arm/arm32/mmu/mm.c | 44 +++++-----
> xen/arch/arm/arm64/mmu/mm.c | 2 +-
> xen/arch/arm/bootfdt.c | 27 +++---
> xen/arch/arm/dom0less-build.c | 18 ++--
> xen/arch/arm/domain_build.c | 106 +++++++++++++-----------
> xen/arch/arm/efi/efi-boot.h | 8 +-
> xen/arch/arm/efi/efi-dom0.c | 13 +--
> xen/arch/arm/include/asm/domain_build.h | 2 +-
> xen/arch/arm/include/asm/kernel.h | 9 ++
> xen/arch/arm/include/asm/setup.h | 40 ++++++++-
> xen/arch/arm/include/asm/static-shmem.h | 4 +-
> xen/arch/arm/kernel.c | 12 +--
> xen/arch/arm/setup.c | 58 +++++++------
> xen/arch/arm/static-memory.c | 27 +++---
> xen/arch/arm/static-shmem.c | 34 ++++----
> 16 files changed, 243 insertions(+), 167 deletions(-)
Lots of mechanical changes but in general I like this approach.
I'd like other maintainers to share their opinion.
[...]
> @@ -1157,10 +1163,12 @@ int __init make_hypervisor_node(struct domain *d,
> }
> else
> {
> - ext_regions = xzalloc(struct meminfo);
> + ext_regions = (struct membanks *)xzalloc(struct meminfo);
You're making assumption that struct membanks is the first member of meminfo but there's no sanity check.
Why not xzalloc_flex_struct()?
> if ( !ext_regions )
> return -ENOMEM;
[...]
> diff --git a/xen/arch/arm/include/asm/kernel.h b/xen/arch/arm/include/asm/kernel.h
> index 0a23e86c2d37..d28b843c01a9 100644
> --- a/xen/arch/arm/include/asm/kernel.h
> +++ b/xen/arch/arm/include/asm/kernel.h
> @@ -78,6 +78,15 @@ struct kernel_info {
> };
> };
>
> +#define kernel_info_get_mem(kinfo) \
> + (&(kinfo)->mem.common)
Why this is a macro but for bootinfo you use static inline helpers?
> +
> +#define KERNEL_INFO_INIT \
NIT: in most places we prefer \ to be aligned (the same apply to other places)
> +{ \
> + .mem.common.max_banks = NR_MEM_BANKS, \
> + .shm_mem.common.max_banks = NR_MEM_BANKS, \
> +}
> +
> /*
> * Probe the kernel to detemine its type and select a loader.
> *
> diff --git a/xen/arch/arm/include/asm/setup.h b/xen/arch/arm/include/asm/setup.h
> index d15a88d2e0d1..a3e1dc8fdb6c 100644
> --- a/xen/arch/arm/include/asm/setup.h
> +++ b/xen/arch/arm/include/asm/setup.h
> @@ -56,8 +56,14 @@ struct membank {
> #endif
> };
>
> -struct meminfo {
> +struct membanks {
> unsigned int nr_banks;
> + unsigned int max_banks;
> + struct membank bank[];
> +};
> +
> +struct meminfo {
> + struct membanks common;
You were supposed to make sure there is no extra padding here. I don't see any check in this patch.
I'd at least do sth like:
BUILD_BUG_ON((offsetof(struct membanks, bank)) != (offsetof(struct meminfo, bank)));
~Michal
^ permalink raw reply [flat|nested] 32+ messages in thread
* Re: [PATCH 03/11] xen/arm: Introduce a generic way to access memory bank structures
2024-03-19 13:10 ` Michal Orzel
@ 2024-03-19 13:30 ` Luca Fancellu
2024-03-20 9:30 ` Julien Grall
1 sibling, 0 replies; 32+ messages in thread
From: Luca Fancellu @ 2024-03-19 13:30 UTC (permalink / raw)
To: Michal Orzel
Cc: Xen-devel, Stefano Stabellini, Julien Grall, Bertrand Marquis,
Volodymyr Babchuk
> On 19 Mar 2024, at 13:10, Michal Orzel <michal.orzel@amd.com> wrote:
>
> Hi Luca,
Hi Michal,
Thanks for having a look
>
> On 12/03/2024 14:03, Luca Fancellu wrote:
>>
>>
>> Currently the 'stuct meminfo' is defining a static defined array of
>> 'struct membank' of NR_MEM_BANKS elements, some feature like
>> shared memory don't require such amount of memory allocation but
>> might want to reuse existing code to manipulate this kind of
>> structure that is just as 'struct meminfo' but less bulky.
>>
>> For this reason introduce a generic way to access this kind of
>> structure using a new stucture 'struct membanks', which implements
> s/stucture/structure
>
>> all the fields needed by a structure related to memory banks
>> without the need to specify at build time the size of the
>> 'struct membank' array.
> Might be beneficial here to mention the use of FAM.
>
>>
>> Modify 'struct meminfo' to implement the field related to the new
>> introduced structure, given the change all usage of this structure
>> are updated in this way:
>> - code accessing bootinfo.{mem,reserved_mem,acpi} field now uses
>> 3 new introduced static inline helpers to access the new field
>> of 'struct meminfo' named 'common'.
>> - code accessing 'struct kernel_info *' member 'mem' now use the
>> new introduced macro 'kernel_info_get_mem(...)' to access the
>> new field of 'struct meminfo' named 'common'.
>>
>> Constify pointers where needed.
>>
>> Suggested-by: Julien Grall <julien@xen.org>
>> Signed-off-by: Luca Fancellu <luca.fancellu@arm.com>
>> ---
>> xen/arch/arm/acpi/domain_build.c | 6 +-
>> xen/arch/arm/arm32/mmu/mm.c | 44 +++++-----
>> xen/arch/arm/arm64/mmu/mm.c | 2 +-
>> xen/arch/arm/bootfdt.c | 27 +++---
>> xen/arch/arm/dom0less-build.c | 18 ++--
>> xen/arch/arm/domain_build.c | 106 +++++++++++++-----------
>> xen/arch/arm/efi/efi-boot.h | 8 +-
>> xen/arch/arm/efi/efi-dom0.c | 13 +--
>> xen/arch/arm/include/asm/domain_build.h | 2 +-
>> xen/arch/arm/include/asm/kernel.h | 9 ++
>> xen/arch/arm/include/asm/setup.h | 40 ++++++++-
>> xen/arch/arm/include/asm/static-shmem.h | 4 +-
>> xen/arch/arm/kernel.c | 12 +--
>> xen/arch/arm/setup.c | 58 +++++++------
>> xen/arch/arm/static-memory.c | 27 +++---
>> xen/arch/arm/static-shmem.c | 34 ++++----
>> 16 files changed, 243 insertions(+), 167 deletions(-)
> Lots of mechanical changes but in general I like this approach.
> I'd like other maintainers to share their opinion.
>
> [...]
>
>> @@ -1157,10 +1163,12 @@ int __init make_hypervisor_node(struct domain *d,
>> }
>> else
>> {
>> - ext_regions = xzalloc(struct meminfo);
>> + ext_regions = (struct membanks *)xzalloc(struct meminfo);
> You're making assumption that struct membanks is the first member of meminfo but there's no sanity check.
> Why not xzalloc_flex_struct()?
I’ll use that, as well as the check you suggested below
>
>> if ( !ext_regions )
>> return -ENOMEM;
>
> [...]
>> diff --git a/xen/arch/arm/include/asm/kernel.h b/xen/arch/arm/include/asm/kernel.h
>> index 0a23e86c2d37..d28b843c01a9 100644
>> --- a/xen/arch/arm/include/asm/kernel.h
>> +++ b/xen/arch/arm/include/asm/kernel.h
>> @@ -78,6 +78,15 @@ struct kernel_info {
>> };
>> };
>>
>> +#define kernel_info_get_mem(kinfo) \
>> + (&(kinfo)->mem.common)
> Why this is a macro but for bootinfo you use static inline helpers?
So I think I started using static inline helpers but I had to have one that didn’t
remove the const qualifier, and it was used only once. Anyway if it is acceptable
I will go for static inline also here.
>
>> +
>> +#define KERNEL_INFO_INIT \
> NIT: in most places we prefer \ to be aligned (the same apply to other places)
kk
>
>> +{ \
>> + .mem.common.max_banks = NR_MEM_BANKS, \
>> + .shm_mem.common.max_banks = NR_MEM_BANKS, \
>> +}
>> +
>> /*
>> * Probe the kernel to detemine its type and select a loader.
>> *
>> diff --git a/xen/arch/arm/include/asm/setup.h b/xen/arch/arm/include/asm/setup.h
>> index d15a88d2e0d1..a3e1dc8fdb6c 100644
>> --- a/xen/arch/arm/include/asm/setup.h
>> +++ b/xen/arch/arm/include/asm/setup.h
>> @@ -56,8 +56,14 @@ struct membank {
>> #endif
>> };
>>
>> -struct meminfo {
>> +struct membanks {
>> unsigned int nr_banks;
>> + unsigned int max_banks;
>> + struct membank bank[];
>> +};
>> +
>> +struct meminfo {
>> + struct membanks common;
> You were supposed to make sure there is no extra padding here. I don't see any check in this patch.
> I'd at least do sth like:
> BUILD_BUG_ON((offsetof(struct membanks, bank)) != (offsetof(struct meminfo, bank)));
I’ll add this check, thanks!
>
> ~Michal
^ permalink raw reply [flat|nested] 32+ messages in thread
* Re: [PATCH 04/11] xen/arm: Conditional compilation of kernel_info.shm_mem member
2024-03-12 13:03 ` [PATCH 04/11] xen/arm: Conditional compilation of kernel_info.shm_mem member Luca Fancellu
@ 2024-03-19 14:58 ` Michal Orzel
2024-04-04 9:27 ` Luca Fancellu
0 siblings, 1 reply; 32+ messages in thread
From: Michal Orzel @ 2024-03-19 14:58 UTC (permalink / raw)
To: Luca Fancellu, xen-devel
Cc: Stefano Stabellini, Julien Grall, Bertrand Marquis, Volodymyr Babchuk
Hi Luca,
On 12/03/2024 14:03, Luca Fancellu wrote:
>
>
> The user of shm_mem member of the 'struct kernel_info' is only
> the code managing the static shared memory feature, which can be
> compiled out using CONFIG_STATIC_SHM, so in case the feature is
> not requested, that member won't be used and will waste memory
> space.
>
> To address this issue, protect the member with the Kconfig parameter
> and modify the signature of the only function using it to remove
> any reference to the member from outside the static-shmem module.
>
> Signed-off-by: Luca Fancellu <luca.fancellu@arm.com>
Reviewed-by: Michal Orzel <michal.orzel@amd.com>
NIT: I always wonder why we have hundreds of functions taking both struct domain and
struct kernel_info as arguments if the latter has the former as its member. As you are
revisiting the function and modifying parameter list, you could take the opportunity
to change it. But you don't have to.
~Michal
^ permalink raw reply [flat|nested] 32+ messages in thread
* Re: [PATCH 03/11] xen/arm: Introduce a generic way to access memory bank structures
2024-03-19 13:10 ` Michal Orzel
2024-03-19 13:30 ` Luca Fancellu
@ 2024-03-20 9:30 ` Julien Grall
1 sibling, 0 replies; 32+ messages in thread
From: Julien Grall @ 2024-03-20 9:30 UTC (permalink / raw)
To: Michal Orzel, Luca Fancellu, xen-devel
Cc: Stefano Stabellini, Bertrand Marquis, Volodymyr Babchuk
On 19/03/2024 13:10, Michal Orzel wrote:
> Hi Luca,
>
> On 12/03/2024 14:03, Luca Fancellu wrote:
>>
>>
>> Currently the 'stuct meminfo' is defining a static defined array of
>> 'struct membank' of NR_MEM_BANKS elements, some feature like
>> shared memory don't require such amount of memory allocation but
>> might want to reuse existing code to manipulate this kind of
>> structure that is just as 'struct meminfo' but less bulky.
>>
>> For this reason introduce a generic way to access this kind of
>> structure using a new stucture 'struct membanks', which implements
> s/stucture/structure
>
>> all the fields needed by a structure related to memory banks
>> without the need to specify at build time the size of the
>> 'struct membank' array.
> Might be beneficial here to mention the use of FAM.
I had to look it up online and there was no hit on Google. I guess you
mean "Flexible Array Member".
>> Modify 'struct meminfo' to implement the field related to the new
>> introduced structure, given the change all usage of this structure
>> are updated in this way:
>> - code accessing bootinfo.{mem,reserved_mem,acpi} field now uses
>> 3 new introduced static inline helpers to access the new field
>> of 'struct meminfo' named 'common'.
>> - code accessing 'struct kernel_info *' member 'mem' now use the
>> new introduced macro 'kernel_info_get_mem(...)' to access the
>> new field of 'struct meminfo' named 'common'.
>>
>> Constify pointers where needed.
>>
>> Suggested-by: Julien Grall <julien@xen.org>
>> Signed-off-by: Luca Fancellu <luca.fancellu@arm.com>
>> ---
>> xen/arch/arm/acpi/domain_build.c | 6 +-
>> xen/arch/arm/arm32/mmu/mm.c | 44 +++++-----
>> xen/arch/arm/arm64/mmu/mm.c | 2 +-
>> xen/arch/arm/bootfdt.c | 27 +++---
>> xen/arch/arm/dom0less-build.c | 18 ++--
>> xen/arch/arm/domain_build.c | 106 +++++++++++++-----------
>> xen/arch/arm/efi/efi-boot.h | 8 +-
>> xen/arch/arm/efi/efi-dom0.c | 13 +--
>> xen/arch/arm/include/asm/domain_build.h | 2 +-
>> xen/arch/arm/include/asm/kernel.h | 9 ++
>> xen/arch/arm/include/asm/setup.h | 40 ++++++++-
>> xen/arch/arm/include/asm/static-shmem.h | 4 +-
>> xen/arch/arm/kernel.c | 12 +--
>> xen/arch/arm/setup.c | 58 +++++++------
>> xen/arch/arm/static-memory.c | 27 +++---
>> xen/arch/arm/static-shmem.c | 34 ++++----
>> 16 files changed, 243 insertions(+), 167 deletions(-)
> Lots of mechanical changes but in general I like this approach.
> I'd like other maintainers to share their opinion.
I don't mind the churn so long we get a correct interface at the end.
The current interface looks alright (I know I suggested it ;)).
>
> [...]
>
>> @@ -1157,10 +1163,12 @@ int __init make_hypervisor_node(struct domain *d,
>> }
>> else
>> {
>> - ext_regions = xzalloc(struct meminfo);
>> + ext_regions = (struct membanks *)xzalloc(struct meminfo);
> You're making assumption that struct membanks is the first member of meminfo but there's no sanity check.
> Why not xzalloc_flex_struct()?
>
>> if ( !ext_regions )
>> return -ENOMEM;
>
> [...]
>> diff --git a/xen/arch/arm/include/asm/kernel.h b/xen/arch/arm/include/asm/kernel.h
>> index 0a23e86c2d37..d28b843c01a9 100644
>> --- a/xen/arch/arm/include/asm/kernel.h
>> +++ b/xen/arch/arm/include/asm/kernel.h
>> @@ -78,6 +78,15 @@ struct kernel_info {
>> };
>> };
>>
>> +#define kernel_info_get_mem(kinfo) \
>> + (&(kinfo)->mem.common)
> Why this is a macro but for bootinfo you use static inline helpers?
>
>> +
>> +#define KERNEL_INFO_INIT \
> NIT: in most places we prefer \ to be aligned (the same apply to other places)
>
>> +{ \
>> + .mem.common.max_banks = NR_MEM_BANKS, \
>> + .shm_mem.common.max_banks = NR_MEM_BANKS, \
>> +}
>> +
>> /*
>> * Probe the kernel to detemine its type and select a loader.
>> *
>> diff --git a/xen/arch/arm/include/asm/setup.h b/xen/arch/arm/include/asm/setup.h
>> index d15a88d2e0d1..a3e1dc8fdb6c 100644
>> --- a/xen/arch/arm/include/asm/setup.h
>> +++ b/xen/arch/arm/include/asm/setup.h
>> @@ -56,8 +56,14 @@ struct membank {
>> #endif
>> };
>>
>> -struct meminfo {
>> +struct membanks {
>> unsigned int nr_banks;
>> + unsigned int max_banks;
>> + struct membank bank[];
>> +};
>> +
>> +struct meminfo {
>> + struct membanks common;
> You were supposed to make sure there is no extra padding here. I don't see any check in this patch.
> I'd at least do sth like:
> BUILD_BUG_ON((offsetof(struct membanks, bank)) != (offsetof(struct meminfo, bank)));
+1. You could also check that "struct membanks" is 8-byte aligned.
Cheers,
--
Julien Grall
^ permalink raw reply [flat|nested] 32+ messages in thread
* Re: [PATCH 05/11] xen/arm: Introduce helper for static memory pages
2024-03-12 13:03 ` [PATCH 05/11] xen/arm: Introduce helper for static memory pages Luca Fancellu
@ 2024-03-20 10:41 ` Michal Orzel
0 siblings, 0 replies; 32+ messages in thread
From: Michal Orzel @ 2024-03-20 10:41 UTC (permalink / raw)
To: Luca Fancellu, xen-devel
Cc: Stefano Stabellini, Julien Grall, Bertrand Marquis, Volodymyr Babchuk
Hi Luca,
On 12/03/2024 14:03, Luca Fancellu wrote:
>
>
> Introduce a new helper function in the static-memory module
> that can be called to manage static memory banks, this is
> done to reuse the code when other modules would like to
> manage static memory banks that are not part of the
> reserved_mem structure.
The placement of this patch in a series is a bit strange given no use of init_staticmem_bank()
in the subsequent patch. I would move it right before patch #8.
Also, you could mention that this is because the information about shared memory regions
will no longer be stored in reserved_mem.
>
> Signed-off-by: Luca Fancellu <luca.fancellu@arm.com>
> ---
> xen/arch/arm/include/asm/static-memory.h | 12 ++++++++++++
> xen/arch/arm/static-memory.c | 12 +-----------
> 2 files changed, 13 insertions(+), 11 deletions(-)
>
> diff --git a/xen/arch/arm/include/asm/static-memory.h b/xen/arch/arm/include/asm/static-memory.h
> index 3e3efd70c38d..665d4df50eda 100644
> --- a/xen/arch/arm/include/asm/static-memory.h
> +++ b/xen/arch/arm/include/asm/static-memory.h
> @@ -7,6 +7,18 @@
>
> #ifdef CONFIG_STATIC_MEMORY
>
> +static inline void init_staticmem_bank(const struct membank *bank)
> +{
> + mfn_t bank_start = _mfn(PFN_UP(bank->start));
The header should be self-contained so you should add <xen/pfn.h> that is not included in asm/kernel.h path.
Other than that:
Reviewed-by: Michal Orzel <michal.orzel@amd.com>
~Michal
^ permalink raw reply [flat|nested] 32+ messages in thread
* Re: [PATCH 06/11] xen/arm: Avoid code duplication in find_unallocated_memory
2024-03-12 13:03 ` [PATCH 06/11] xen/arm: Avoid code duplication in find_unallocated_memory Luca Fancellu
@ 2024-03-20 10:57 ` Michal Orzel
2024-03-20 14:53 ` Luca Fancellu
0 siblings, 1 reply; 32+ messages in thread
From: Michal Orzel @ 2024-03-20 10:57 UTC (permalink / raw)
To: Luca Fancellu, xen-devel
Cc: Stefano Stabellini, Julien Grall, Bertrand Marquis, Volodymyr Babchuk
Hi Luca,
On 12/03/2024 14:03, Luca Fancellu wrote:
>
>
> The function find_unallocated_memory is using the same code to
> loop through 3 structure of the same type, in order to avoid
> code duplication, rework the code to have only one loop that
> goes through all the structures.
>
> Signed-off-by: Luca Fancellu <luca.fancellu@arm.com>
> ---
> xen/arch/arm/domain_build.c | 62 ++++++++++---------------------------
> 1 file changed, 17 insertions(+), 45 deletions(-)
>
> diff --git a/xen/arch/arm/domain_build.c b/xen/arch/arm/domain_build.c
> index b254f252e7cb..d0f2ac6060eb 100644
> --- a/xen/arch/arm/domain_build.c
> +++ b/xen/arch/arm/domain_build.c
> @@ -869,12 +869,14 @@ static int __init add_ext_regions(unsigned long s_gfn, unsigned long e_gfn,
> static int __init find_unallocated_memory(const struct kernel_info *kinfo,
> struct membanks *ext_regions)
> {
> - const struct membanks *kinfo_mem = kernel_info_get_mem(kinfo);
> - const struct membanks *mem = bootinfo_get_mem();
> - const struct membanks *reserved_mem = bootinfo_get_reserved_mem();
> + const struct membanks *mem_banks[] = {
> + bootinfo_get_mem(),
> + kernel_info_get_mem(kinfo),
> + bootinfo_get_reserved_mem(),
> + };
> struct rangeset *unalloc_mem;
> paddr_t start, end;
> - unsigned int i;
> + unsigned int i, j;
> int res;
>
> dt_dprintk("Find unallocated memory for extended regions\n");
> @@ -883,50 +885,20 @@ static int __init find_unallocated_memory(const struct kernel_info *kinfo,
> if ( !unalloc_mem )
> return -ENOMEM;
>
> - /* Start with all available RAM */
> - for ( i = 0; i < mem->nr_banks; i++ )
> - {
> - start = mem->bank[i].start;
> - end = mem->bank[i].start + mem->bank[i].size;
> - res = rangeset_add_range(unalloc_mem, PFN_DOWN(start),
> - PFN_DOWN(end - 1));
> - if ( res )
> - {
> - printk(XENLOG_ERR "Failed to add: %#"PRIpaddr"->%#"PRIpaddr"\n",
> - start, end);
> - goto out;
> - }
> - }
> -
> - /* Remove RAM assigned to Dom0 */
> - for ( i = 0; i < kinfo_mem->nr_banks; i++ )
> - {
> - start = kinfo_mem->bank[i].start;
> - end = kinfo_mem->bank[i].start + kinfo_mem->bank[i].size;
> - res = rangeset_remove_range(unalloc_mem, PFN_DOWN(start),
> - PFN_DOWN(end - 1));
> - if ( res )
> + for ( i = 0; i < ARRAY_SIZE(mem_banks); i++ )
> + for ( j = 0; j < mem_banks[i]->nr_banks; j++ )
It might be a matter of personal opinion, but I would actually prefer the current code
that looks simpler/neater (the steps are clear) to me. I'd like to know other maintainers opinion.
~Michal
^ permalink raw reply [flat|nested] 32+ messages in thread
* Re: [PATCH 06/11] xen/arm: Avoid code duplication in find_unallocated_memory
2024-03-20 10:57 ` Michal Orzel
@ 2024-03-20 14:53 ` Luca Fancellu
2024-03-21 9:02 ` Michal Orzel
0 siblings, 1 reply; 32+ messages in thread
From: Luca Fancellu @ 2024-03-20 14:53 UTC (permalink / raw)
To: Michal Orzel
Cc: Xen-devel, Stefano Stabellini, Julien Grall, Bertrand Marquis,
Volodymyr Babchuk
> On 20 Mar 2024, at 10:57, Michal Orzel <michal.orzel@amd.com> wrote:
>
> Hi Luca,
>
> On 12/03/2024 14:03, Luca Fancellu wrote:
>>
>>
>> The function find_unallocated_memory is using the same code to
>> loop through 3 structure of the same type, in order to avoid
>> code duplication, rework the code to have only one loop that
>> goes through all the structures.
>>
>> Signed-off-by: Luca Fancellu <luca.fancellu@arm.com>
>> ---
>> xen/arch/arm/domain_build.c | 62 ++++++++++---------------------------
>> 1 file changed, 17 insertions(+), 45 deletions(-)
>>
>> diff --git a/xen/arch/arm/domain_build.c b/xen/arch/arm/domain_build.c
>> index b254f252e7cb..d0f2ac6060eb 100644
>> --- a/xen/arch/arm/domain_build.c
>> +++ b/xen/arch/arm/domain_build.c
>> @@ -869,12 +869,14 @@ static int __init add_ext_regions(unsigned long s_gfn, unsigned long e_gfn,
>> static int __init find_unallocated_memory(const struct kernel_info *kinfo,
>> struct membanks *ext_regions)
>> {
>> - const struct membanks *kinfo_mem = kernel_info_get_mem(kinfo);
>> - const struct membanks *mem = bootinfo_get_mem();
>> - const struct membanks *reserved_mem = bootinfo_get_reserved_mem();
>> + const struct membanks *mem_banks[] = {
>> + bootinfo_get_mem(),
>> + kernel_info_get_mem(kinfo),
>> + bootinfo_get_reserved_mem(),
>> + };
>> struct rangeset *unalloc_mem;
>> paddr_t start, end;
>> - unsigned int i;
>> + unsigned int i, j;
>> int res;
>>
>> dt_dprintk("Find unallocated memory for extended regions\n");
>> @@ -883,50 +885,20 @@ static int __init find_unallocated_memory(const struct kernel_info *kinfo,
>> if ( !unalloc_mem )
>> return -ENOMEM;
>>
>> - /* Start with all available RAM */
>> - for ( i = 0; i < mem->nr_banks; i++ )
>> - {
>> - start = mem->bank[i].start;
>> - end = mem->bank[i].start + mem->bank[i].size;
>> - res = rangeset_add_range(unalloc_mem, PFN_DOWN(start),
>> - PFN_DOWN(end - 1));
>> - if ( res )
>> - {
>> - printk(XENLOG_ERR "Failed to add: %#"PRIpaddr"->%#"PRIpaddr"\n",
>> - start, end);
>> - goto out;
>> - }
>> - }
>> -
>> - /* Remove RAM assigned to Dom0 */
>> - for ( i = 0; i < kinfo_mem->nr_banks; i++ )
>> - {
>> - start = kinfo_mem->bank[i].start;
>> - end = kinfo_mem->bank[i].start + kinfo_mem->bank[i].size;
>> - res = rangeset_remove_range(unalloc_mem, PFN_DOWN(start),
>> - PFN_DOWN(end - 1));
>> - if ( res )
>> + for ( i = 0; i < ARRAY_SIZE(mem_banks); i++ )
>> + for ( j = 0; j < mem_banks[i]->nr_banks; j++ )
> It might be a matter of personal opinion, but I would actually prefer the current code
> that looks simpler/neater (the steps are clear) to me. I'd like to know other maintainers opinion.
Ok, I’ll wait the other maintainers then, I’m going to use this construct in other part
of the code to simplify and remove duplication so it would be important to know if
It’s desirable or not.
Maybe your opinion could change with a proper comment on top of the structure and the loop,
listing the operation performed in order?
1) Start with all available RAM
2) Remove RAM assigned to Dom0
3) Remove reserved mem
<later>
4) Remove static shared memory regions
Cheers,
Luca
>
> ~Michal
^ permalink raw reply [flat|nested] 32+ messages in thread
* Re: [PATCH 06/11] xen/arm: Avoid code duplication in find_unallocated_memory
2024-03-20 14:53 ` Luca Fancellu
@ 2024-03-21 9:02 ` Michal Orzel
0 siblings, 0 replies; 32+ messages in thread
From: Michal Orzel @ 2024-03-21 9:02 UTC (permalink / raw)
To: Luca Fancellu
Cc: Xen-devel, Stefano Stabellini, Julien Grall, Bertrand Marquis,
Volodymyr Babchuk
Hi Luca,
On 20/03/2024 15:53, Luca Fancellu wrote:
>
>
>> On 20 Mar 2024, at 10:57, Michal Orzel <michal.orzel@amd.com> wrote:
>>
>> Hi Luca,
>>
>> On 12/03/2024 14:03, Luca Fancellu wrote:
>>>
>>>
>>> The function find_unallocated_memory is using the same code to
>>> loop through 3 structure of the same type, in order to avoid
>>> code duplication, rework the code to have only one loop that
>>> goes through all the structures.
>>>
>>> Signed-off-by: Luca Fancellu <luca.fancellu@arm.com>
>>> ---
>>> xen/arch/arm/domain_build.c | 62 ++++++++++---------------------------
>>> 1 file changed, 17 insertions(+), 45 deletions(-)
>>>
>>> diff --git a/xen/arch/arm/domain_build.c b/xen/arch/arm/domain_build.c
>>> index b254f252e7cb..d0f2ac6060eb 100644
>>> --- a/xen/arch/arm/domain_build.c
>>> +++ b/xen/arch/arm/domain_build.c
>>> @@ -869,12 +869,14 @@ static int __init add_ext_regions(unsigned long s_gfn, unsigned long e_gfn,
>>> static int __init find_unallocated_memory(const struct kernel_info *kinfo,
>>> struct membanks *ext_regions)
>>> {
>>> - const struct membanks *kinfo_mem = kernel_info_get_mem(kinfo);
>>> - const struct membanks *mem = bootinfo_get_mem();
>>> - const struct membanks *reserved_mem = bootinfo_get_reserved_mem();
>>> + const struct membanks *mem_banks[] = {
>>> + bootinfo_get_mem(),
>>> + kernel_info_get_mem(kinfo),
>>> + bootinfo_get_reserved_mem(),
>>> + };
>>> struct rangeset *unalloc_mem;
>>> paddr_t start, end;
>>> - unsigned int i;
>>> + unsigned int i, j;
>>> int res;
>>>
>>> dt_dprintk("Find unallocated memory for extended regions\n");
>>> @@ -883,50 +885,20 @@ static int __init find_unallocated_memory(const struct kernel_info *kinfo,
>>> if ( !unalloc_mem )
>>> return -ENOMEM;
>>>
>>> - /* Start with all available RAM */
>>> - for ( i = 0; i < mem->nr_banks; i++ )
>>> - {
>>> - start = mem->bank[i].start;
>>> - end = mem->bank[i].start + mem->bank[i].size;
>>> - res = rangeset_add_range(unalloc_mem, PFN_DOWN(start),
>>> - PFN_DOWN(end - 1));
>>> - if ( res )
>>> - {
>>> - printk(XENLOG_ERR "Failed to add: %#"PRIpaddr"->%#"PRIpaddr"\n",
>>> - start, end);
>>> - goto out;
>>> - }
>>> - }
>>> -
>>> - /* Remove RAM assigned to Dom0 */
>>> - for ( i = 0; i < kinfo_mem->nr_banks; i++ )
>>> - {
>>> - start = kinfo_mem->bank[i].start;
>>> - end = kinfo_mem->bank[i].start + kinfo_mem->bank[i].size;
>>> - res = rangeset_remove_range(unalloc_mem, PFN_DOWN(start),
>>> - PFN_DOWN(end - 1));
>>> - if ( res )
>>> + for ( i = 0; i < ARRAY_SIZE(mem_banks); i++ )
>>> + for ( j = 0; j < mem_banks[i]->nr_banks; j++ )
>> It might be a matter of personal opinion, but I would actually prefer the current code
>> that looks simpler/neater (the steps are clear) to me. I'd like to know other maintainers opinion.
>
> Ok, I’ll wait the other maintainers then, I’m going to use this construct in other part
> of the code to simplify and remove duplication so it would be important to know if
> It’s desirable or not.
>
> Maybe your opinion could change with a proper comment on top of the structure and the loop,
> listing the operation performed in order?
>
> 1) Start with all available RAM
> 2) Remove RAM assigned to Dom0
> 3) Remove reserved mem
> <later>
> 4) Remove static shared memory regions
Yes, that would help with the overall readability.
~Michal
^ permalink raw reply [flat|nested] 32+ messages in thread
* Re: [PATCH 08/11] xen/arm: Reduce struct membank size on static shared memory
2024-03-12 13:03 ` [PATCH 08/11] xen/arm: Reduce struct membank size on static shared memory Luca Fancellu
@ 2024-03-22 10:30 ` Michal Orzel
2024-04-04 9:33 ` Luca Fancellu
0 siblings, 1 reply; 32+ messages in thread
From: Michal Orzel @ 2024-03-22 10:30 UTC (permalink / raw)
To: Luca Fancellu, xen-devel
Cc: Stefano Stabellini, Julien Grall, Bertrand Marquis, Volodymyr Babchuk
Hi Luca,
On 12/03/2024 14:03, Luca Fancellu wrote:
>
>
> Currently the memory footprint of the static shared memory feature
> is impacting all the struct meminfo instances with memory space
> that is not going to be used.
>
> To solve this issue, rework the static shared memory extra
> information linked to the memory bank to another structure,
> struct shmem_membank_extra, and exploit the struct membank
> padding to host a pointer to that structure in a union with the
NIT: AFAICT the padding will be reused on Arm64 but on Arm32 there will still be 4B padding.
> enum membank_type, with this trick the 'struct membank' has the
> same size with or without the static shared memory, given that
> the 'type' and 'shmem_extra' are never used at the same time.
>
> Afterwards, create a new structure 'struct shared_meminfo' which
> has the same interface of 'struct meminfo', but requires less
> banks and hosts the extra information for the static shared memory.
> The fields 'bank' and 'extra' of this structure are meant to be
> linked by the index (e.g. extra[idx] will have the information for
> the bank[idx], for i=0..NR_SHMEM_BANKS), the convinient pointer
> 'shmem_extra' of 'struct membank' is then linked to the related
> 'extra' bank to ease the fruition when a function has access only
> to the 'struct membanks common' of 'struct shared_meminfo'.
>
> The last part of this work is to move the allocation of the
> static shared memory banks from the 'reserved_mem' to a new
> 'shmem' member of the 'struct bootinfo'.
> Change also the 'shm_mem' member type to be 'struct shared_meminfo'
> in order to match the above changes and allow a memory space
> reduction also in 'struct kernel_info'.
Ok, so from this point onwards, when dealing with "reserved" memory, one needs
to account for shmem as well, as it will no longer be part of bootinfo.reserved_mem
(unlike static-mem or static-heap). This is really the only disadvantage. The changes
LGTM, just a few comments below.
>
> Signed-off-by: Luca Fancellu <luca.fancellu@arm.com>
> ---
> xen/arch/arm/arm32/mmu/mm.c | 24 +++++++++
> xen/arch/arm/arm64/mmu/mm.c | 2 +
> xen/arch/arm/bootfdt.c | 1 +
> xen/arch/arm/domain_build.c | 4 ++
> xen/arch/arm/include/asm/kernel.h | 4 +-
> xen/arch/arm/include/asm/setup.h | 41 +++++++++++++--
> xen/arch/arm/include/asm/static-shmem.h | 8 +++
> xen/arch/arm/setup.c | 25 ++++++++-
> xen/arch/arm/static-shmem.c | 69 ++++++++++++++++++-------
> 9 files changed, 154 insertions(+), 24 deletions(-)
>
> diff --git a/xen/arch/arm/arm32/mmu/mm.c b/xen/arch/arm/arm32/mmu/mm.c
> index e6bb5d934c16..45e42b307e20 100644
> --- a/xen/arch/arm/arm32/mmu/mm.c
> +++ b/xen/arch/arm/arm32/mmu/mm.c
> @@ -7,6 +7,7 @@
> #include <xen/pfn.h>
> #include <asm/fixmap.h>
> #include <asm/static-memory.h>
> +#include <asm/static-shmem.h>
>
> static unsigned long opt_xenheap_megabytes __initdata;
> integer_param("xenheap_megabytes", opt_xenheap_megabytes);
> @@ -42,6 +43,9 @@ static paddr_t __init consider_modules(paddr_t s, paddr_t e,
> int first_mod)
> {
> const struct membanks *reserved_mem = bootinfo_get_reserved_mem();
> +#ifdef CONFIG_STATIC_SHM
> + const struct membanks *shmem = bootinfo_get_shmem();
> +#endif
> const struct bootmodules *mi = &bootinfo.modules;
> int i;
> int nr;
> @@ -118,6 +122,25 @@ static paddr_t __init consider_modules(paddr_t s, paddr_t e,
> return consider_modules(s, r_s, size, align, i + 1);
> }
> }
> +
> +#ifdef CONFIG_STATIC_SHM
> + nr += reserved_mem->nr_banks;
> + for ( ; i - nr < shmem->nr_banks; i++ )
> + {
> + paddr_t r_s = shmem->bank[i - nr].start;
> + paddr_t r_e = r_s + shmem->bank[i - nr].size;
> +
> + if ( s < r_e && r_s < e )
> + {
> + r_e = consider_modules(r_e, e, size, align, i + 1);
> + if ( r_e )
> + return r_e;
> +
> + return consider_modules(s, r_s, size, align, i + 1);
> + }
> + }
> +#endif
> +
> return e;
> }
>
> @@ -294,6 +317,7 @@ void __init setup_mm(void)
> mfn_to_maddr(directmap_mfn_end));
>
> init_staticmem_pages();
> + init_sharedmem_pages();
> }
>
> /*
> diff --git a/xen/arch/arm/arm64/mmu/mm.c b/xen/arch/arm/arm64/mmu/mm.c
> index f8aaf4ac18be..293acb67e09c 100644
> --- a/xen/arch/arm/arm64/mmu/mm.c
> +++ b/xen/arch/arm/arm64/mmu/mm.c
> @@ -6,6 +6,7 @@
>
> #include <asm/setup.h>
> #include <asm/static-memory.h>
> +#include <asm/static-shmem.h>
>
> /* Override macros from asm/page.h to make them work with mfn_t */
> #undef virt_to_mfn
> @@ -236,6 +237,7 @@ void __init setup_mm(void)
> max_page = PFN_DOWN(ram_end);
>
> init_staticmem_pages();
> + init_sharedmem_pages();
> }
>
> /*
> diff --git a/xen/arch/arm/bootfdt.c b/xen/arch/arm/bootfdt.c
> index ecbc80d6a112..f2344863062e 100644
> --- a/xen/arch/arm/bootfdt.c
> +++ b/xen/arch/arm/bootfdt.c
> @@ -499,6 +499,7 @@ static void __init early_print_info(void)
> mem_resv->bank[j].start,
> mem_resv->bank[j].start + mem_resv->bank[j].size - 1);
> }
> + early_print_info_shmem();
> printk("\n");
> for ( i = 0 ; i < cmds->nr_mods; i++ )
> printk("CMDLINE[%"PRIpaddr"]:%s %s\n", cmds->cmdline[i].start,
> diff --git a/xen/arch/arm/domain_build.c b/xen/arch/arm/domain_build.c
> index d0f2ac6060eb..9fad9e8b2c40 100644
> --- a/xen/arch/arm/domain_build.c
> +++ b/xen/arch/arm/domain_build.c
> @@ -864,6 +864,7 @@ static int __init add_ext_regions(unsigned long s_gfn, unsigned long e_gfn,
> * regions we exclude every region assigned to Dom0 from the Host RAM:
> * - domain RAM
> * - reserved-memory
> + * - static shared memory
> * - grant table space
> */
> static int __init find_unallocated_memory(const struct kernel_info *kinfo,
> @@ -873,6 +874,9 @@ static int __init find_unallocated_memory(const struct kernel_info *kinfo,
> bootinfo_get_mem(),
> kernel_info_get_mem(kinfo),
> bootinfo_get_reserved_mem(),
> +#ifdef CONFIG_STATIC_SHM
> + bootinfo_get_shmem(),
> +#endif
> };
> struct rangeset *unalloc_mem;
> paddr_t start, end;
> diff --git a/xen/arch/arm/include/asm/kernel.h b/xen/arch/arm/include/asm/kernel.h
> index 5785da985ccf..937ffcefc73f 100644
> --- a/xen/arch/arm/include/asm/kernel.h
> +++ b/xen/arch/arm/include/asm/kernel.h
> @@ -40,7 +40,7 @@ struct kernel_info {
> paddr_t unassigned_mem; /* RAM not (yet) assigned to a bank */
> struct meminfo mem;
> #ifdef CONFIG_STATIC_SHM
> - struct meminfo shm_mem;
> + struct shared_meminfo shm_mem;
> #endif
>
> /* kernel entry point */
> @@ -84,7 +84,7 @@ struct kernel_info {
> (&(kinfo)->mem.common)
>
> #ifdef CONFIG_STATIC_SHM
> -#define KERNEL_INFO_SHM_MEM_INIT .shm_mem.common.max_banks = NR_MEM_BANKS,
> +#define KERNEL_INFO_SHM_MEM_INIT .shm_mem.common.max_banks = NR_SHMEM_BANKS,
> #else
> #define KERNEL_INFO_SHM_MEM_INIT
> #endif
> diff --git a/xen/arch/arm/include/asm/setup.h b/xen/arch/arm/include/asm/setup.h
> index a3e1dc8fdb6c..07011bd776da 100644
> --- a/xen/arch/arm/include/asm/setup.h
> +++ b/xen/arch/arm/include/asm/setup.h
> @@ -9,6 +9,7 @@
> #define MAX_FDT_SIZE SZ_2M
>
> #define NR_MEM_BANKS 256
> +#define NR_SHMEM_BANKS 32
>
> #define MAX_MODULES 32 /* Current maximum useful modules */
>
> @@ -46,14 +47,20 @@ enum membank_type {
> /* Indicates the maximum number of characters(\0 included) for shm_id */
> #define MAX_SHM_ID_LENGTH 16
>
> +struct shmem_membank_extra {
> + char shm_id[MAX_SHM_ID_LENGTH];
> + unsigned int nr_shm_borrowers;
> +};
> +
> struct membank {
> paddr_t start;
> paddr_t size;
> - enum membank_type type;
> + union {
> + enum membank_type type;
> #ifdef CONFIG_STATIC_SHM
> - char shm_id[MAX_SHM_ID_LENGTH];
> - unsigned int nr_shm_borrowers;
> + struct shmem_membank_extra *shmem_extra;
> #endif
> + };
> };
>
> struct membanks {
> @@ -67,6 +74,12 @@ struct meminfo {
> struct membank bank[NR_MEM_BANKS];
> };
>
> +struct shared_meminfo {
> + struct membanks common;
> + struct membank bank[NR_SHMEM_BANKS];
> + struct shmem_membank_extra extra[NR_SHMEM_BANKS];
> +};
Same as with meminfo, please add a BUILD_BUG_ON for padding between common and bank.
> +
> /*
> * The domU flag is set for kernels and ramdisks of "xen,domain" nodes.
> * The purpose of the domU flag is to avoid getting confused in
> @@ -109,6 +122,9 @@ struct bootinfo {
> struct bootcmdlines cmdlines;
> #ifdef CONFIG_ACPI
> struct meminfo acpi;
> +#endif
> +#ifdef CONFIG_STATIC_SHM
> + struct shared_meminfo shmem;
> #endif
> bool static_heap;
> };
> @@ -119,11 +135,18 @@ struct bootinfo {
> #define BOOTINFO_ACPI_INIT
> #endif
>
> +#ifdef CONFIG_STATIC_SHM
> +#define BOOTINFO_SHMEM_INIT .shmem.common.max_banks = NR_SHMEM_BANKS,
> +#else
> +#define BOOTINFO_SHMEM_INIT
> +#endif
> +
> #define BOOTINFO_INIT \
> { \
> .mem.common.max_banks = NR_MEM_BANKS, \
> .reserved_mem.common.max_banks = NR_MEM_BANKS, \
> BOOTINFO_ACPI_INIT \
> + BOOTINFO_SHMEM_INIT \
> }
>
> struct map_range_data
> @@ -158,6 +181,18 @@ static inline struct membanks *bootinfo_get_acpi(void)
> }
> #endif
>
> +#ifdef CONFIG_STATIC_SHM
> +static inline struct membanks *bootinfo_get_shmem(void)
> +{
> + return &bootinfo.shmem.common;
> +}
> +
> +static inline struct shmem_membank_extra *bootinfo_get_shmem_extra(void)
> +{
> + return bootinfo.shmem.extra;
> +}
> +#endif
> +
> void copy_from_paddr(void *dst, paddr_t paddr, unsigned long len);
>
> size_t estimate_efi_size(unsigned int mem_nr_banks);
> diff --git a/xen/arch/arm/include/asm/static-shmem.h b/xen/arch/arm/include/asm/static-shmem.h
> index 108cedb55a9f..c6fac9906656 100644
> --- a/xen/arch/arm/include/asm/static-shmem.h
> +++ b/xen/arch/arm/include/asm/static-shmem.h
> @@ -25,6 +25,10 @@ static inline int process_shm_chosen(struct domain *d,
> int process_shm_node(const void *fdt, int node, uint32_t address_cells,
> uint32_t size_cells);
>
> +void early_print_info_shmem(void);
> +
> +void init_sharedmem_pages(void);
> +
> #else /* !CONFIG_STATIC_SHM */
>
> static inline int make_resv_memory_node(const struct domain *d,
> @@ -53,6 +57,10 @@ static inline int process_shm_node(const void *fdt, int node,
> return -EINVAL;
> }
>
> +static inline void early_print_info_shmem(void) {};
> +
> +static inline void init_sharedmem_pages(void) {};
> +
> #endif /* CONFIG_STATIC_SHM */
>
> #endif /* __ASM_STATIC_SHMEM_H_ */
> diff --git a/xen/arch/arm/setup.c b/xen/arch/arm/setup.c
> index cc719d508d63..111172a8c4b1 100644
> --- a/xen/arch/arm/setup.c
> +++ b/xen/arch/arm/setup.c
> @@ -208,6 +208,9 @@ static void __init dt_unreserved_regions(paddr_t s, paddr_t e,
> unsigned int first)
> {
> const struct membanks *reserved_mem = bootinfo_get_reserved_mem();
> +#ifdef CONFIG_STATIC_SHM
> + const struct membanks *shmem = bootinfo_get_shmem();
> +#endif
> unsigned int i, nr;
> int rc;
>
> @@ -258,6 +261,22 @@ static void __init dt_unreserved_regions(paddr_t s, paddr_t e,
> }
> }
>
> +#ifdef CONFIG_STATIC_SHM
> + nr += reserved_mem->nr_banks;
> + for ( ; i - nr < shmem->nr_banks; i++ )
> + {
> + paddr_t r_s = shmem->bank[i - nr].start;
> + paddr_t r_e = r_s + shmem->bank[i - nr].size;
> +
> + if ( s < r_e && r_s < e )
> + {
> + dt_unreserved_regions(r_e, e, cb, i + 1);
> + dt_unreserved_regions(s, r_s, cb, i + 1);
> + return;
> + }
> + }
> +#endif
> +
> cb(s, e);
> }
>
> @@ -344,13 +363,17 @@ bool __init check_reserved_regions_overlap(paddr_t region_start,
> bootinfo_get_reserved_mem(),
> #ifdef CONFIG_ACPI
> bootinfo_get_acpi(),
> +#endif
> +#ifdef CONFIG_STATIC_SHM
> + bootinfo_get_shmem(),
> #endif
> };
> unsigned int i;
>
> /*
> * Check if input region is overlapping with reserved memory banks or
> - * ACPI EfiACPIReclaimMemory (when ACPI feature is enabled)
> + * ACPI EfiACPIReclaimMemory (when ACPI feature is enabled) or static
> + * 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) )
> diff --git a/xen/arch/arm/static-shmem.c b/xen/arch/arm/static-shmem.c
> index 8b7da952be6e..6143f52cb991 100644
> --- a/xen/arch/arm/static-shmem.c
> +++ b/xen/arch/arm/static-shmem.c
> @@ -4,29 +4,30 @@
> #include <xen/sched.h>
>
> #include <asm/domain_build.h>
> +#include <asm/static-memory.h>
> #include <asm/static-shmem.h>
>
> static int __init acquire_nr_borrower_domain(struct domain *d,
> paddr_t pbase, paddr_t psize,
> unsigned long *nr_borrowers)
> {
> - const struct membanks *reserved_mem = bootinfo_get_reserved_mem();
> + const struct membanks *shmem = bootinfo_get_shmem();
> unsigned int bank;
>
> /* Iterate reserved memory to find requested shm bank. */
> - for ( bank = 0 ; bank < reserved_mem->nr_banks; bank++ )
> + for ( bank = 0 ; bank < shmem->nr_banks; bank++ )
> {
> - paddr_t bank_start = reserved_mem->bank[bank].start;
> - paddr_t bank_size = reserved_mem->bank[bank].size;
> + paddr_t bank_start = shmem->bank[bank].start;
> + paddr_t bank_size = shmem->bank[bank].size;
>
> if ( (pbase == bank_start) && (psize == bank_size) )
> break;
> }
>
> - if ( bank == reserved_mem->nr_banks )
> + if ( bank == shmem->nr_banks )
> return -ENOENT;
>
> - *nr_borrowers = reserved_mem->bank[bank].nr_shm_borrowers;
> + *nr_borrowers = shmem->bank[bank].shmem_extra->nr_shm_borrowers;
>
> return 0;
> }
> @@ -158,16 +159,22 @@ static int __init assign_shared_memory(struct domain *d,
> return ret;
> }
>
> -static int __init append_shm_bank_to_domain(struct membanks *shm_mem,
> - paddr_t start, paddr_t size,
> - const char *shm_id)
> +static int __init
> +append_shm_bank_to_domain(struct shared_meminfo *kinfo_shm_mem, paddr_t start,
Is there any particular reason to prepend the shm_mem name with kinfo?
~Michal
^ permalink raw reply [flat|nested] 32+ messages in thread
* Re: [PATCH 09/11] xen/arm: remove shm holes for extended regions
2024-03-12 13:03 ` [PATCH 09/11] xen/arm: remove shm holes for extended regions Luca Fancellu
@ 2024-03-22 15:09 ` Michal Orzel
2024-03-22 20:11 ` Luca Fancellu
0 siblings, 1 reply; 32+ messages in thread
From: Michal Orzel @ 2024-03-22 15:09 UTC (permalink / raw)
To: Luca Fancellu, xen-devel
Cc: Penny Zheng, Stefano Stabellini, Julien Grall, Bertrand Marquis,
Volodymyr Babchuk
Hi Luca,
NIT: title s/for/from?
On 12/03/2024 14:03, Luca Fancellu wrote:
>
>
> From: Penny Zheng <Penny.Zheng@arm.com>
>
> Static shared memory acts as reserved memory in guest, so it shall be
> excluded from extended regions.
>
> Extended regions are taken care of under three different scenarios:
> normal DomU, direct-map domain with iommu on, and direct-map domain
> with iommu off.
>
> For normal DomU, we create a new function "remove_shm_holes_for_domU",
> to firstly transfer original outputs into the format of
> "struct rangeset", then use "remove_shm_from_rangeset" to remove static
> shm from them.
>
> For direct-map domain with iommu on, after we get guest shm info from "kinfo",
> we use "remove_shm_from_rangeset" to remove static shm.
>
> For direct-map domain with iommu off, as static shm has already been taken
> care of through reserved memory banks, we do nothing.
>
> Signed-off-by: Penny Zheng <penny.zheng@arm.com>
> Signed-off-by: Luca Fancellu <luca.fancellu@arm.com>
> ---
> v1:
> - Rework of https://patchwork.kernel.org/project/xen-devel/patch/20231206090623.1932275-8-Penny.Zheng@arm.com/
> ---
> xen/arch/arm/domain_build.c | 16 ++++-
> xen/arch/arm/include/asm/domain_build.h | 2 +
> xen/arch/arm/include/asm/static-shmem.h | 18 ++++++
> xen/arch/arm/static-shmem.c | 86 +++++++++++++++++++++++++
> 4 files changed, 119 insertions(+), 3 deletions(-)
>
> diff --git a/xen/arch/arm/domain_build.c b/xen/arch/arm/domain_build.c
> index 9fad9e8b2c40..740c483ea2db 100644
> --- a/xen/arch/arm/domain_build.c
> +++ b/xen/arch/arm/domain_build.c
> @@ -817,8 +817,8 @@ int __init make_memory_node(const struct domain *d,
> return res;
> }
>
> -static int __init add_ext_regions(unsigned long s_gfn, unsigned long e_gfn,
> - void *data)
> +int __init add_ext_regions(unsigned long s_gfn, unsigned long e_gfn,
> + void *data)
> {
> struct membanks *ext_regions = data;
> paddr_t start, size;
> @@ -969,6 +969,8 @@ static int __init handle_pci_range(const struct dt_device_node *dev,
> * - MMIO
> * - Host RAM
> * - PCI aperture
> + * - Static shared memory regions, which are described by special property
> + * "xen,domain-shared-memory-v1"
I'm not sure if providing a compatible here makes sense. If at all, I would put "xen,shared-mem" which holds the addresses.
> */
> static int __init find_memory_holes(const struct kernel_info *kinfo,
> struct membanks *ext_regions)
> @@ -985,6 +987,11 @@ static int __init find_memory_holes(const struct kernel_info *kinfo,
> if ( !mem_holes )
> return -ENOMEM;
>
> + /* Remove static shared memory regions */
> + res = remove_shm_from_rangeset(kinfo, mem_holes);
> + if ( res )
> + goto out;
How can you remove from a rangeset without first adding to it?
This should be moved after rangeset_add_range().
Also, usually (and this is the case in this function) we pass frames
to rangeset and not addresses (argument is of type ul). However...
> +
> /* Start with maximum possible addressable physical memory range */
> start = 0;
> end = (1ULL << p2m_ipa_bits) - 1;
> @@ -1089,7 +1096,10 @@ static int __init find_domU_holes(const struct kernel_info *kinfo,
> res = 0;
> }
>
> - return res;
> + if ( res )
> + return res;
> +
> + return remove_shm_holes_for_domU(kinfo, ext_regions);
> }
>
> int __init make_hypervisor_node(struct domain *d,
> diff --git a/xen/arch/arm/include/asm/domain_build.h b/xen/arch/arm/include/asm/domain_build.h
> index a6f276cc4263..026d975da28e 100644
> --- a/xen/arch/arm/include/asm/domain_build.h
> +++ b/xen/arch/arm/include/asm/domain_build.h
> @@ -51,6 +51,8 @@ static inline int prepare_acpi(struct domain *d, struct kernel_info *kinfo)
> int prepare_acpi(struct domain *d, struct kernel_info *kinfo);
> #endif
>
> +int add_ext_regions(unsigned long s_gfn, unsigned long e_gfn, void *data);
> +
> #endif
>
> /*
> diff --git a/xen/arch/arm/include/asm/static-shmem.h b/xen/arch/arm/include/asm/static-shmem.h
> index c6fac9906656..2f70aed53ac7 100644
> --- a/xen/arch/arm/include/asm/static-shmem.h
> +++ b/xen/arch/arm/include/asm/static-shmem.h
> @@ -29,6 +29,12 @@ void early_print_info_shmem(void);
>
> void init_sharedmem_pages(void);
>
> +int remove_shm_from_rangeset(const struct kernel_info *kinfo,
> + struct rangeset *rangeset);
> +
> +int remove_shm_holes_for_domU(const struct kernel_info *kinfo,
> + struct membanks *ext_regions);
> +
> #else /* !CONFIG_STATIC_SHM */
>
> static inline int make_resv_memory_node(const struct domain *d,
> @@ -61,6 +67,18 @@ static inline void early_print_info_shmem(void) {};
>
> static inline void init_sharedmem_pages(void) {};
>
> +static inline int remove_shm_from_rangeset(const struct kernel_info *kinfo,
> + struct rangeset *rangeset)
> +{
> + return 0;
> +}
> +
> +static inline int remove_shm_holes_for_domU(const struct kernel_info *kinfo,
> + struct membanks *ext_regions)
> +{
> + return 0;
> +}
> +
> #endif /* CONFIG_STATIC_SHM */
>
> #endif /* __ASM_STATIC_SHMEM_H_ */
> diff --git a/xen/arch/arm/static-shmem.c b/xen/arch/arm/static-shmem.c
> index 6143f52cb991..b3e2105dd3f2 100644
> --- a/xen/arch/arm/static-shmem.c
> +++ b/xen/arch/arm/static-shmem.c
> @@ -1,6 +1,7 @@
> /* SPDX-License-Identifier: GPL-2.0-only */
>
> #include <xen/libfdt/libfdt.h>
> +#include <xen/rangeset.h>
> #include <xen/sched.h>
>
> #include <asm/domain_build.h>
> @@ -564,6 +565,91 @@ void __init init_sharedmem_pages(void)
> init_staticmem_bank(&shmem->bank[bank]);
> }
>
> +int __init remove_shm_from_rangeset(const struct kernel_info *kinfo,
> + struct rangeset *rangeset)
> +{
> + const struct membanks *shm_mem = &kinfo->shm_mem.common;
> + unsigned int i;
> +
> + /* Remove static shared memory regions */
> + for ( i = 0; i < shm_mem->nr_banks; i++ )
> + {
> + paddr_t start, end;
... here, these hold physical addresses and...
> + int res;
> +
> + start = shm_mem->bank[i].start;
> + end = shm_mem->bank[i].start + shm_mem->bank[i].size - 1;
> + res = rangeset_remove_range(rangeset, start, end);
you will end up in a mix which won't work. Switch to PFN_DOWN()
> + if ( res )
What's the point of res variable if it is not printed below?
> + {
> + printk(XENLOG_ERR "Failed to remove: %#"PRIpaddr"->%#"PRIpaddr"\n",
> + start, end);
> + return -EINVAL;
> + }
> + }
> +
> + return 0;
> +}
> +
> +int __init remove_shm_holes_for_domU(const struct kernel_info *kinfo,
> + struct membanks *ext_regions)
> +{
> + const struct membanks *shm_mem = &kinfo->shm_mem.common;
> + struct rangeset *guest_holes;
> + unsigned int i;
> + paddr_t start;
> + paddr_t end;
> + int res;
> +
> + /* No static shared memory region. */
> + if ( shm_mem->nr_banks == 0 )
> + return 0;
> +
> + dt_dprintk("Remove static shared memory holes for extended regions of DomU\n");
> +
> + guest_holes = rangeset_new(NULL, NULL, 0);
> + if ( !guest_holes )
> + return -ENOMEM;
> +
> + /* Copy extended regions sets into the rangeset */
> + for ( i = 0; i < ext_regions->nr_banks; i++ )
> + {
> + start = ext_regions->bank[i].start;
> + end = start + ext_regions->bank[i].size - 1;
> +
> + res = rangeset_add_range(guest_holes, start, end);
Ditto, PFN_DOWN().
~Michal
^ permalink raw reply [flat|nested] 32+ messages in thread
* Re: [PATCH 09/11] xen/arm: remove shm holes for extended regions
2024-03-22 15:09 ` Michal Orzel
@ 2024-03-22 20:11 ` Luca Fancellu
0 siblings, 0 replies; 32+ messages in thread
From: Luca Fancellu @ 2024-03-22 20:11 UTC (permalink / raw)
To: Michal Orzel
Cc: Xen-devel, Penny Zheng, Stefano Stabellini, Julien Grall,
Bertrand Marquis, Volodymyr Babchuk
> On 22 Mar 2024, at 15:09, Michal Orzel <michal.orzel@amd.com> wrote:
>
> Hi Luca,
>
> NIT: title s/for/from?
>
> On 12/03/2024 14:03, Luca Fancellu wrote:
>>
>>
>> From: Penny Zheng <Penny.Zheng@arm.com>
>>
>> Static shared memory acts as reserved memory in guest, so it shall be
>> excluded from extended regions.
>>
>> Extended regions are taken care of under three different scenarios:
>> normal DomU, direct-map domain with iommu on, and direct-map domain
>> with iommu off.
>>
>> For normal DomU, we create a new function "remove_shm_holes_for_domU",
>> to firstly transfer original outputs into the format of
>> "struct rangeset", then use "remove_shm_from_rangeset" to remove static
>> shm from them.
>>
>> For direct-map domain with iommu on, after we get guest shm info from "kinfo",
>> we use "remove_shm_from_rangeset" to remove static shm.
>>
>> For direct-map domain with iommu off, as static shm has already been taken
>> care of through reserved memory banks, we do nothing.
>>
>> Signed-off-by: Penny Zheng <penny.zheng@arm.com>
>> Signed-off-by: Luca Fancellu <luca.fancellu@arm.com>
>> ---
>> v1:
>> - Rework of https://patchwork.kernel.org/project/xen-devel/patch/20231206090623.1932275-8-Penny.Zheng@arm.com/
>> ---
>> xen/arch/arm/domain_build.c | 16 ++++-
>> xen/arch/arm/include/asm/domain_build.h | 2 +
>> xen/arch/arm/include/asm/static-shmem.h | 18 ++++++
>> xen/arch/arm/static-shmem.c | 86 +++++++++++++++++++++++++
>> 4 files changed, 119 insertions(+), 3 deletions(-)
>>
>> diff --git a/xen/arch/arm/domain_build.c b/xen/arch/arm/domain_build.c
>> index 9fad9e8b2c40..740c483ea2db 100644
>> --- a/xen/arch/arm/domain_build.c
>> +++ b/xen/arch/arm/domain_build.c
>> @@ -817,8 +817,8 @@ int __init make_memory_node(const struct domain *d,
>> return res;
>> }
>>
>> -static int __init add_ext_regions(unsigned long s_gfn, unsigned long e_gfn,
>> - void *data)
>> +int __init add_ext_regions(unsigned long s_gfn, unsigned long e_gfn,
>> + void *data)
>> {
>> struct membanks *ext_regions = data;
>> paddr_t start, size;
>> @@ -969,6 +969,8 @@ static int __init handle_pci_range(const struct dt_device_node *dev,
>> * - MMIO
>> * - Host RAM
>> * - PCI aperture
>> + * - Static shared memory regions, which are described by special property
>> + * "xen,domain-shared-memory-v1"
> I'm not sure if providing a compatible here makes sense. If at all, I would put "xen,shared-mem" which holds the addresses.
>
>> */
>> static int __init find_memory_holes(const struct kernel_info *kinfo,
>> struct membanks *ext_regions)
>> @@ -985,6 +987,11 @@ static int __init find_memory_holes(const struct kernel_info *kinfo,
>> if ( !mem_holes )
>> return -ENOMEM;
>>
>> + /* Remove static shared memory regions */
>> + res = remove_shm_from_rangeset(kinfo, mem_holes);
>> + if ( res )
>> + goto out;
> How can you remove from a rangeset without first adding to it?
> This should be moved after rangeset_add_range().
You are very right
> Also, usually (and this is the case in this function) we pass frames
> to rangeset and not addresses (argument is of type ul). However...
>
>> +
>> /* Start with maximum possible addressable physical memory range */
>> start = 0;
>> end = (1ULL << p2m_ipa_bits) - 1;
>> @@ -1089,7 +1096,10 @@ static int __init find_domU_holes(const struct kernel_info *kinfo,
>> res = 0;
>> }
>>
>> - return res;
>> + if ( res )
>> + return res;
>> +
>> + return remove_shm_holes_for_domU(kinfo, ext_regions);
>> }
>>
>> int __init make_hypervisor_node(struct domain *d,
>> diff --git a/xen/arch/arm/include/asm/domain_build.h b/xen/arch/arm/include/asm/domain_build.h
>> index a6f276cc4263..026d975da28e 100644
>> --- a/xen/arch/arm/include/asm/domain_build.h
>> +++ b/xen/arch/arm/include/asm/domain_build.h
>> @@ -51,6 +51,8 @@ static inline int prepare_acpi(struct domain *d, struct kernel_info *kinfo)
>> int prepare_acpi(struct domain *d, struct kernel_info *kinfo);
>> #endif
>>
>> +int add_ext_regions(unsigned long s_gfn, unsigned long e_gfn, void *data);
>> +
>> #endif
>>
>> /*
>> diff --git a/xen/arch/arm/include/asm/static-shmem.h b/xen/arch/arm/include/asm/static-shmem.h
>> index c6fac9906656..2f70aed53ac7 100644
>> --- a/xen/arch/arm/include/asm/static-shmem.h
>> +++ b/xen/arch/arm/include/asm/static-shmem.h
>> @@ -29,6 +29,12 @@ void early_print_info_shmem(void);
>>
>> void init_sharedmem_pages(void);
>>
>> +int remove_shm_from_rangeset(const struct kernel_info *kinfo,
>> + struct rangeset *rangeset);
>> +
>> +int remove_shm_holes_for_domU(const struct kernel_info *kinfo,
>> + struct membanks *ext_regions);
>> +
>> #else /* !CONFIG_STATIC_SHM */
>>
>> static inline int make_resv_memory_node(const struct domain *d,
>> @@ -61,6 +67,18 @@ static inline void early_print_info_shmem(void) {};
>>
>> static inline void init_sharedmem_pages(void) {};
>>
>> +static inline int remove_shm_from_rangeset(const struct kernel_info *kinfo,
>> + struct rangeset *rangeset)
>> +{
>> + return 0;
>> +}
>> +
>> +static inline int remove_shm_holes_for_domU(const struct kernel_info *kinfo,
>> + struct membanks *ext_regions)
>> +{
>> + return 0;
>> +}
>> +
>> #endif /* CONFIG_STATIC_SHM */
>>
>> #endif /* __ASM_STATIC_SHMEM_H_ */
>> diff --git a/xen/arch/arm/static-shmem.c b/xen/arch/arm/static-shmem.c
>> index 6143f52cb991..b3e2105dd3f2 100644
>> --- a/xen/arch/arm/static-shmem.c
>> +++ b/xen/arch/arm/static-shmem.c
>> @@ -1,6 +1,7 @@
>> /* SPDX-License-Identifier: GPL-2.0-only */
>>
>> #include <xen/libfdt/libfdt.h>
>> +#include <xen/rangeset.h>
>> #include <xen/sched.h>
>>
>> #include <asm/domain_build.h>
>> @@ -564,6 +565,91 @@ void __init init_sharedmem_pages(void)
>> init_staticmem_bank(&shmem->bank[bank]);
>> }
>>
>> +int __init remove_shm_from_rangeset(const struct kernel_info *kinfo,
>> + struct rangeset *rangeset)
>> +{
>> + const struct membanks *shm_mem = &kinfo->shm_mem.common;
>> + unsigned int i;
>> +
>> + /* Remove static shared memory regions */
>> + for ( i = 0; i < shm_mem->nr_banks; i++ )
>> + {
>> + paddr_t start, end;
> ... here, these hold physical addresses and...
>
>> + int res;
>> +
>> + start = shm_mem->bank[i].start;
>> + end = shm_mem->bank[i].start + shm_mem->bank[i].size - 1;
>> + res = rangeset_remove_range(rangeset, start, end);
> you will end up in a mix which won't work. Switch to PFN_DOWN()
Will fix
>
>> + if ( res )
> What's the point of res variable if it is not printed below?
I guess this part was copied from find_memory_holes which doesn’t print out res,
anyway you are right, we should print it.
>
>> + {
>> + printk(XENLOG_ERR "Failed to remove: %#"PRIpaddr"->%#"PRIpaddr"\n",
>> + start, end);
>> + return -EINVAL;
>> + }
>> + }
>> +
>> + return 0;
>> +}
>> +
>> +int __init remove_shm_holes_for_domU(const struct kernel_info *kinfo,
>> + struct membanks *ext_regions)
>> +{
>> + const struct membanks *shm_mem = &kinfo->shm_mem.common;
>> + struct rangeset *guest_holes;
>> + unsigned int i;
>> + paddr_t start;
>> + paddr_t end;
>> + int res;
>> +
>> + /* No static shared memory region. */
>> + if ( shm_mem->nr_banks == 0 )
>> + return 0;
>> +
>> + dt_dprintk("Remove static shared memory holes for extended regions of DomU\n");
>> +
>> + guest_holes = rangeset_new(NULL, NULL, 0);
>> + if ( !guest_holes )
>> + return -ENOMEM;
>> +
>> + /* Copy extended regions sets into the rangeset */
>> + for ( i = 0; i < ext_regions->nr_banks; i++ )
>> + {
>> + start = ext_regions->bank[i].start;
>> + end = start + ext_regions->bank[i].size - 1;
>> +
>> + res = rangeset_add_range(guest_holes, start, end);
> Ditto, PFN_DOWN().
Thanks for the review, I will fix the issues in the next push, I’ll just wait
for the serie to be fully reviewed, or if you don’t want to check the remaining
two patches before I fix the previous comments, just let me know.
>
> ~Michal
^ permalink raw reply [flat|nested] 32+ messages in thread
* Re: [PATCH 10/11] xen/arm: fix duplicate /reserved-memory node in Dom0
2024-03-12 13:03 ` [PATCH 10/11] xen/arm: fix duplicate /reserved-memory node in Dom0 Luca Fancellu
@ 2024-03-25 8:09 ` Michal Orzel
0 siblings, 0 replies; 32+ messages in thread
From: Michal Orzel @ 2024-03-25 8:09 UTC (permalink / raw)
To: Luca Fancellu, xen-devel
Cc: Penny Zheng, Stefano Stabellini, Julien Grall, Bertrand Marquis,
Volodymyr Babchuk
Hi Luca,
On 12/03/2024 14:03, Luca Fancellu wrote:
>
>
> From: Penny Zheng <Penny.Zheng@arm.com>
>
> In case there is a /reserved-memory node already present in the host dtb,
> current Xen codes would create yet another /reserved-memory node when
> the static shared memory feature is enabled and static shared memory
> region are present, this would result in an incorrect device tree
s/region/regions, please add full stop after present.
> generation and guest would not be able to detect the static shared memory
s/guest/hwdom to make it clear when the issue can be observed
> region.
>
> Avoid this issue checking the presence of the /reserved-memory node and
by checking
> appending the nodes instead of generating a duplicate /reserved-memory.
>
> Signed-off-by: Penny Zheng <penny.zheng@arm.com>
> Signed-off-by: Luca Fancellu <luca.fancellu@arm.com>
> ---
> v1:
> - Rework of https://patchwork.kernel.org/project/xen-devel/patch/20231206090623.1932275-11-Penny.Zheng@arm.com/
> ---
> xen/arch/arm/domain_build.c | 23 ++++++++++++++++++++---
> xen/arch/arm/include/asm/static-shmem.h | 11 +++++++++++
> xen/arch/arm/static-shmem.c | 12 +++++++-----
> 3 files changed, 38 insertions(+), 8 deletions(-)
>
> diff --git a/xen/arch/arm/domain_build.c b/xen/arch/arm/domain_build.c
> index 740c483ea2db..575e906d81a6 100644
> --- a/xen/arch/arm/domain_build.c
> +++ b/xen/arch/arm/domain_build.c
> @@ -1620,6 +1620,7 @@ static int __init handle_node(struct domain *d, struct kernel_info *kinfo,
> DT_MATCH_PATH("/hypervisor"),
> { /* sentinel */ },
> };
> + static __initdata bool res_mem_node_found = false;
> struct dt_device_node *child;
> int res, i, nirq, irq_id;
> const char *name;
> @@ -1714,6 +1715,19 @@ static int __init handle_node(struct domain *d, struct kernel_info *kinfo,
> if ( res )
> return res;
>
> + if ( dt_node_path_is_equal(node, "/reserved-memory") )
> + {
> + res_mem_node_found = true;
> + /*
> + * Avoid duplicate /reserved-memory nodes in Device Tree, so list the
s/list/add
> + * static shared memory nodes there.
> + */
> + res = make_shm_memory_node(d, kinfo, dt_n_addr_cells(node),
> + dt_n_size_cells(node));
> + if ( res )
> + return res;
> + }
> +
> for ( child = node->child; child != NULL; child = child->sibling )
> {
> res = handle_node(d, kinfo, child, p2mt);
> @@ -1766,9 +1780,12 @@ static int __init handle_node(struct domain *d, struct kernel_info *kinfo,
> return res;
> }
>
> - res = make_resv_memory_node(d, kinfo, addrcells, sizecells);
> - if ( res )
> - return res;
> + if ( !res_mem_node_found )
> + {
> + res = make_resv_memory_node(d, kinfo, addrcells, sizecells);
> + if ( res )
> + return res;
> + }
> }
>
> res = fdt_end_node(kinfo->fdt);
> diff --git a/xen/arch/arm/include/asm/static-shmem.h b/xen/arch/arm/include/asm/static-shmem.h
> index 2f70aed53ac7..d28b9540d49b 100644
> --- a/xen/arch/arm/include/asm/static-shmem.h
> +++ b/xen/arch/arm/include/asm/static-shmem.h
> @@ -35,6 +35,10 @@ int remove_shm_from_rangeset(const struct kernel_info *kinfo,
> int remove_shm_holes_for_domU(const struct kernel_info *kinfo,
> struct membanks *ext_regions);
>
> +int make_shm_memory_node(const struct domain *d,
> + const struct kernel_info *kinfo, int addrcells,
> + int sizecells);
> +
> #else /* !CONFIG_STATIC_SHM */
>
> static inline int make_resv_memory_node(const struct domain *d,
> @@ -79,6 +83,13 @@ static inline int remove_shm_holes_for_domU(const struct kernel_info *kinfo,
> return 0;
> }
>
> +static inline int make_shm_memory_node(const struct domain *d,
> + const struct kernel_info *kinfo,
> + int addrcells, int sizecells)
> +{
> + return 0;
> +}
> +
> #endif /* CONFIG_STATIC_SHM */
>
> #endif /* __ASM_STATIC_SHMEM_H_ */
> diff --git a/xen/arch/arm/static-shmem.c b/xen/arch/arm/static-shmem.c
> index b3e2105dd3f2..67d5fa3b5d25 100644
> --- a/xen/arch/arm/static-shmem.c
> +++ b/xen/arch/arm/static-shmem.c
> @@ -287,15 +287,17 @@ int __init process_shm(struct domain *d, struct kernel_info *kinfo,
> return 0;
> }
>
> -static int __init make_shm_memory_node(const struct domain *d, void *fdt,
> - int addrcells, int sizecells,
> - const struct membanks *mem)
> +int __init make_shm_memory_node(const struct domain *d,
> + const struct kernel_info *kinfo, int addrcells,
> + int sizecells)
Strictly speaking, changing the function signature is not mandatory for this change, so I would
at least mention it in the commit msg.
Other than that:
Reviewed-by: Michal Orzel <michal.orzel@amd.com>
~Michal
^ permalink raw reply [flat|nested] 32+ messages in thread
* Re: [PATCH 11/11] xen/arm: List static shared memory regions as /memory nodes
2024-03-12 13:03 ` [PATCH 11/11] xen/arm: List static shared memory regions as /memory nodes Luca Fancellu
@ 2024-03-25 8:58 ` Michal Orzel
2024-03-26 14:19 ` Luca Fancellu
0 siblings, 1 reply; 32+ messages in thread
From: Michal Orzel @ 2024-03-25 8:58 UTC (permalink / raw)
To: Luca Fancellu, xen-devel
Cc: Stefano Stabellini, Julien Grall, Bertrand Marquis, Volodymyr Babchuk
Hi Luca,
On 12/03/2024 14:03, Luca Fancellu wrote:
>
>
> Currently Xen is not exporting the static shared memory regions
> to the device tree as /memory node, this commit is fixing this
> issue.
Looking at the implementation, you will always call make_shm_memory_node() twice. For the first
time, to create /memory node and for the second time to create entry under /reserved-memory. Also,
you will create a separate /memory node for every single shmem region instead of combining them
in a single /memory region like make_memory_node() would do. Can't we reuse this function for simplicity?
Also, afaict it is not forbidden to specify shmem range (correct me if I'm wrong), where guest address will be
within with RAM allocated by Xen (e.g. GPA RAM range 0x40000000 - 0x60000000 and shmem is at 0x50000000). In this case,
you would create yet another /memory node that would result in overlap (i.e. more than one /memory node specifying the same range).
~Michal
^ permalink raw reply [flat|nested] 32+ messages in thread
* Re: [PATCH 11/11] xen/arm: List static shared memory regions as /memory nodes
2024-03-25 8:58 ` Michal Orzel
@ 2024-03-26 14:19 ` Luca Fancellu
2024-03-27 8:27 ` Michal Orzel
0 siblings, 1 reply; 32+ messages in thread
From: Luca Fancellu @ 2024-03-26 14:19 UTC (permalink / raw)
To: Michal Orzel
Cc: Xen-devel, Stefano Stabellini, Julien Grall, Bertrand Marquis,
Volodymyr Babchuk
> On 25 Mar 2024, at 08:58, Michal Orzel <michal.orzel@amd.com> wrote:
>
> Hi Luca,
>
Hi Michal,
> On 12/03/2024 14:03, Luca Fancellu wrote:
>>
>>
>> Currently Xen is not exporting the static shared memory regions
>> to the device tree as /memory node, this commit is fixing this
>> issue.
> Looking at the implementation, you will always call make_shm_memory_node() twice. For the first
> time, to create /memory node and for the second time to create entry under /reserved-memory. Also,
> you will create a separate /memory node for every single shmem region instead of combining them
> in a single /memory region like make_memory_node() would do. Can't we reuse this function for simplicity?
You mean using make_memory_node() to populate /reserved-memory and /memory? I feel they are very different
In terms of properties to be created, so I don’t think we should create a make_memory_node() that does both.
Otherwise if you were suggesting to modify make_memory_node() only for what concerns the /memory nodes,
it might be feasible, however there are some parts that need to be skipped with some flags (all the code accessing .type
member), if I understand correctly you like this function because it doesn’t create one node for every bank, but it creates
reg addresses instead, in that case I could modify the current make_shm_memory_node() to do the same.
>
> Also, afaict it is not forbidden to specify shmem range (correct me if I'm wrong), where guest address will be
> within with RAM allocated by Xen (e.g. GPA RAM range 0x40000000 - 0x60000000 and shmem is at 0x50000000). In this case,
> you would create yet another /memory node that would result in overlap (i.e. more than one /memory node specifying the same range).
This is a good point I didn’t think about, yes currently the code is creating overlapping nodes in that case, wow so it means I
need to compute the non overlapping regions and emit a /memory node then! :) ouch
Please let me know if I understood correctly your comments.
Cheers,
Luca
>
> ~Michal
^ permalink raw reply [flat|nested] 32+ messages in thread
* Re: [PATCH 11/11] xen/arm: List static shared memory regions as /memory nodes
2024-03-26 14:19 ` Luca Fancellu
@ 2024-03-27 8:27 ` Michal Orzel
0 siblings, 0 replies; 32+ messages in thread
From: Michal Orzel @ 2024-03-27 8:27 UTC (permalink / raw)
To: Luca Fancellu
Cc: Xen-devel, Stefano Stabellini, Julien Grall, Bertrand Marquis,
Volodymyr Babchuk
Hi Luca,
On 26/03/2024 15:19, Luca Fancellu wrote:
>
>
>> On 25 Mar 2024, at 08:58, Michal Orzel <michal.orzel@amd.com> wrote:
>>
>> Hi Luca,
>>
>
> Hi Michal,
>
>> On 12/03/2024 14:03, Luca Fancellu wrote:
>>>
>>>
>>> Currently Xen is not exporting the static shared memory regions
>>> to the device tree as /memory node, this commit is fixing this
>>> issue.
>> Looking at the implementation, you will always call make_shm_memory_node() twice. For the first
>> time, to create /memory node and for the second time to create entry under /reserved-memory. Also,
>> you will create a separate /memory node for every single shmem region instead of combining them
>> in a single /memory region like make_memory_node() would do. Can't we reuse this function for simplicity?
>
> You mean using make_memory_node() to populate /reserved-memory and /memory? I feel they are very different
> In terms of properties to be created, so I don’t think we should create a make_memory_node() that does both.
>
> Otherwise if you were suggesting to modify make_memory_node() only for what concerns the /memory nodes,
yes, this is what I meant
> it might be feasible, however there are some parts that need to be skipped with some flags (all the code accessing .type
> member), if I understand correctly you like this function because it doesn’t create one node for every bank, but it creates
> reg addresses instead, in that case I could modify the current make_shm_memory_node() to do the same.
My concern is that we will have 2 functions to create memory nodes instead of one that can be reused. I know the issue is with
.type member. If skipping results in a worse code, then I'm ok with make_shm_memory_node() used for 2 purposes (would it be possible
to create /memory and entry under /reserved in the same call to a function?).
>
>>
>> Also, afaict it is not forbidden to specify shmem range (correct me if I'm wrong), where guest address will be
>> within with RAM allocated by Xen (e.g. GPA RAM range 0x40000000 - 0x60000000 and shmem is at 0x50000000). In this case,
>> you would create yet another /memory node that would result in overlap (i.e. more than one /memory node specifying the same range).
>
> This is a good point I didn’t think about, yes currently the code is creating overlapping nodes in that case, wow so it means I
> need to compute the non overlapping regions and emit a /memory node then! :) ouch
>
> Please let me know if I understood correctly your comments.
>
> Cheers,
> Luca
>
>>
>> ~Michal
>
~Michal
^ permalink raw reply [flat|nested] 32+ messages in thread
* Re: [PATCH 04/11] xen/arm: Conditional compilation of kernel_info.shm_mem member
2024-03-19 14:58 ` Michal Orzel
@ 2024-04-04 9:27 ` Luca Fancellu
2024-04-04 9:33 ` Michal Orzel
0 siblings, 1 reply; 32+ messages in thread
From: Luca Fancellu @ 2024-04-04 9:27 UTC (permalink / raw)
To: Michal Orzel
Cc: Xen-devel, Stefano Stabellini, Julien Grall, Bertrand Marquis,
Volodymyr Babchuk
> On 19 Mar 2024, at 14:58, Michal Orzel <michal.orzel@amd.com> wrote:
>
> Hi Luca,
>
> On 12/03/2024 14:03, Luca Fancellu wrote:
>>
>>
>> The user of shm_mem member of the 'struct kernel_info' is only
>> the code managing the static shared memory feature, which can be
>> compiled out using CONFIG_STATIC_SHM, so in case the feature is
>> not requested, that member won't be used and will waste memory
>> space.
>>
>> To address this issue, protect the member with the Kconfig parameter
>> and modify the signature of the only function using it to remove
>> any reference to the member from outside the static-shmem module.
>>
>> Signed-off-by: Luca Fancellu <luca.fancellu@arm.com>
> Reviewed-by: Michal Orzel <michal.orzel@amd.com>
>
> NIT: I always wonder why we have hundreds of functions taking both struct domain and
> struct kernel_info as arguments if the latter has the former as its member. As you are
> revisiting the function and modifying parameter list, you could take the opportunity
> to change it. But you don't have to.
You are right, can I do this modification as part of patch 3 and this one? Also, can I keep your R-by
here when doing this change?
>
> ~Michal
>
^ permalink raw reply [flat|nested] 32+ messages in thread
* Re: [PATCH 04/11] xen/arm: Conditional compilation of kernel_info.shm_mem member
2024-04-04 9:27 ` Luca Fancellu
@ 2024-04-04 9:33 ` Michal Orzel
0 siblings, 0 replies; 32+ messages in thread
From: Michal Orzel @ 2024-04-04 9:33 UTC (permalink / raw)
To: Luca Fancellu
Cc: Xen-devel, Stefano Stabellini, Julien Grall, Bertrand Marquis,
Volodymyr Babchuk
Hi Luca,
On 04/04/2024 11:27, Luca Fancellu wrote:
>
>
>> On 19 Mar 2024, at 14:58, Michal Orzel <michal.orzel@amd.com> wrote:
>>
>> Hi Luca,
>>
>> On 12/03/2024 14:03, Luca Fancellu wrote:
>>>
>>>
>>> The user of shm_mem member of the 'struct kernel_info' is only
>>> the code managing the static shared memory feature, which can be
>>> compiled out using CONFIG_STATIC_SHM, so in case the feature is
>>> not requested, that member won't be used and will waste memory
>>> space.
>>>
>>> To address this issue, protect the member with the Kconfig parameter
>>> and modify the signature of the only function using it to remove
>>> any reference to the member from outside the static-shmem module.
>>>
>>> Signed-off-by: Luca Fancellu <luca.fancellu@arm.com>
>> Reviewed-by: Michal Orzel <michal.orzel@amd.com>
>>
>> NIT: I always wonder why we have hundreds of functions taking both struct domain and
>> struct kernel_info as arguments if the latter has the former as its member. As you are
>> revisiting the function and modifying parameter list, you could take the opportunity
>> to change it. But you don't have to.
>
> You are right, can I do this modification as part of patch 3 and this one? Also, can I keep your R-by
> here when doing this change?
You can do this as part of patch 3 (afaict there will be no need to modify the argument list in patch 4)
and you can keep my Rb.
~Michal
^ permalink raw reply [flat|nested] 32+ messages in thread
* Re: [PATCH 08/11] xen/arm: Reduce struct membank size on static shared memory
2024-03-22 10:30 ` Michal Orzel
@ 2024-04-04 9:33 ` Luca Fancellu
2024-04-04 11:19 ` Michal Orzel
0 siblings, 1 reply; 32+ messages in thread
From: Luca Fancellu @ 2024-04-04 9:33 UTC (permalink / raw)
To: Michal Orzel
Cc: Xen-devel, Stefano Stabellini, Julien Grall, Bertrand Marquis,
Volodymyr Babchuk
> On 22 Mar 2024, at 10:30, Michal Orzel <michal.orzel@amd.com> wrote:
>
> Hi Luca,
>
> On 12/03/2024 14:03, Luca Fancellu wrote:
>>
>>
>> Currently the memory footprint of the static shared memory feature
>> is impacting all the struct meminfo instances with memory space
>> that is not going to be used.
>>
>> To solve this issue, rework the static shared memory extra
>> information linked to the memory bank to another structure,
>> struct shmem_membank_extra, and exploit the struct membank
>> padding to host a pointer to that structure in a union with the
> NIT: AFAICT the padding will be reused on Arm64 but on Arm32 there will still be 4B padding.
Yes, my purpose was to make clear that no additional space was needed
for that pointer, should I rephrase it or it’s ok?
>>
>>
>> +struct shared_meminfo {
>> + struct membanks common;
>> + struct membank bank[NR_SHMEM_BANKS];
>> + struct shmem_membank_extra extra[NR_SHMEM_BANKS];
>> +};
> Same as with meminfo, please add a BUILD_BUG_ON for padding between common and bank.
Sure
>>
>>
>> -static int __init append_shm_bank_to_domain(struct membanks *shm_mem,
>> - paddr_t start, paddr_t size,
>> - const char *shm_id)
>> +static int __init
>> +append_shm_bank_to_domain(struct shared_meminfo *kinfo_shm_mem, paddr_t start,
> Is there any particular reason to prepend the shm_mem name with kinfo?
I think because usually kinfo is used to point to ’struct kernel_info’, instead here we point to
'struct shared_meminfo'
>
> ~Michal
^ permalink raw reply [flat|nested] 32+ messages in thread
* Re: [PATCH 08/11] xen/arm: Reduce struct membank size on static shared memory
2024-04-04 9:33 ` Luca Fancellu
@ 2024-04-04 11:19 ` Michal Orzel
0 siblings, 0 replies; 32+ messages in thread
From: Michal Orzel @ 2024-04-04 11:19 UTC (permalink / raw)
To: Luca Fancellu
Cc: Xen-devel, Stefano Stabellini, Julien Grall, Bertrand Marquis,
Volodymyr Babchuk
Hi Luca,
On 04/04/2024 11:33, Luca Fancellu wrote:
>
>
>> On 22 Mar 2024, at 10:30, Michal Orzel <michal.orzel@amd.com> wrote:
>>
>> Hi Luca,
>>
>> On 12/03/2024 14:03, Luca Fancellu wrote:
>>>
>>>
>>> Currently the memory footprint of the static shared memory feature
>>> is impacting all the struct meminfo instances with memory space
>>> that is not going to be used.
>>>
>>> To solve this issue, rework the static shared memory extra
>>> information linked to the memory bank to another structure,
>>> struct shmem_membank_extra, and exploit the struct membank
>>> padding to host a pointer to that structure in a union with the
>> NIT: AFAICT the padding will be reused on Arm64 but on Arm32 there will still be 4B padding.
>
> Yes, my purpose was to make clear that no additional space was needed
> for that pointer, should I rephrase it or it’s ok?
Since you are modifying this patch anyway, you can take the opportunity to rephrase it.
>
>
>>>
>>>
>>> +struct shared_meminfo {
>>> + struct membanks common;
>>> + struct membank bank[NR_SHMEM_BANKS];
>>> + struct shmem_membank_extra extra[NR_SHMEM_BANKS];
>>> +};
>> Same as with meminfo, please add a BUILD_BUG_ON for padding between common and bank.
>
> Sure
>
>>>
>>>
>>> -static int __init append_shm_bank_to_domain(struct membanks *shm_mem,
>>> - paddr_t start, paddr_t size,
>>> - const char *shm_id)
>>> +static int __init
>>> +append_shm_bank_to_domain(struct shared_meminfo *kinfo_shm_mem, paddr_t start,
>> Is there any particular reason to prepend the shm_mem name with kinfo?
>
> I think because usually kinfo is used to point to ’struct kernel_info’, instead here we point to
> 'struct shared_meminfo'
>
>>
>> ~Michal
>
~Michal
^ permalink raw reply [flat|nested] 32+ messages in thread
end of thread, other threads:[~2024-04-04 11:20 UTC | newest]
Thread overview: 32+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2024-03-12 13:03 [PATCH 00/11] Static shared memory followup v2 - pt1 Luca Fancellu
2024-03-12 13:03 ` [PATCH 01/11] xen/arm: remove stale addr_cells/size_cells in assign_shared_memory Luca Fancellu
2024-03-12 13:03 ` [PATCH 02/11] xen/arm: avoid repetitive checking in process_shm_node Luca Fancellu
2024-03-19 10:57 ` Michal Orzel
2024-03-12 13:03 ` [PATCH 03/11] xen/arm: Introduce a generic way to access memory bank structures Luca Fancellu
2024-03-19 13:10 ` Michal Orzel
2024-03-19 13:30 ` Luca Fancellu
2024-03-20 9:30 ` Julien Grall
2024-03-12 13:03 ` [PATCH 04/11] xen/arm: Conditional compilation of kernel_info.shm_mem member Luca Fancellu
2024-03-19 14:58 ` Michal Orzel
2024-04-04 9:27 ` Luca Fancellu
2024-04-04 9:33 ` Michal Orzel
2024-03-12 13:03 ` [PATCH 05/11] xen/arm: Introduce helper for static memory pages Luca Fancellu
2024-03-20 10:41 ` Michal Orzel
2024-03-12 13:03 ` [PATCH 06/11] xen/arm: Avoid code duplication in find_unallocated_memory Luca Fancellu
2024-03-20 10:57 ` Michal Orzel
2024-03-20 14:53 ` Luca Fancellu
2024-03-21 9:02 ` Michal Orzel
2024-03-12 13:03 ` [PATCH 07/11] xen/arm: Avoid code duplication in check_reserved_regions_overlap Luca Fancellu
2024-03-12 13:03 ` [PATCH 08/11] xen/arm: Reduce struct membank size on static shared memory Luca Fancellu
2024-03-22 10:30 ` Michal Orzel
2024-04-04 9:33 ` Luca Fancellu
2024-04-04 11:19 ` Michal Orzel
2024-03-12 13:03 ` [PATCH 09/11] xen/arm: remove shm holes for extended regions Luca Fancellu
2024-03-22 15:09 ` Michal Orzel
2024-03-22 20:11 ` Luca Fancellu
2024-03-12 13:03 ` [PATCH 10/11] xen/arm: fix duplicate /reserved-memory node in Dom0 Luca Fancellu
2024-03-25 8:09 ` Michal Orzel
2024-03-12 13:03 ` [PATCH 11/11] xen/arm: List static shared memory regions as /memory nodes Luca Fancellu
2024-03-25 8:58 ` Michal Orzel
2024-03-26 14:19 ` Luca Fancellu
2024-03-27 8:27 ` Michal Orzel
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