Hi Stefano,
On 12/08/2019 23:28, Stefano Stabellini wrote:
As we parse the device tree in Xen, keep track of the reserved-memory
regions as they need special treatment (follow-up patches will make use
of the stored information.)
Reuse process_memory_node to add reserved-memory regions to the
bootinfo.reserved_mem array.
Refuse to continue once we reach the max number of reserved memory
regions to avoid accidentally mapping any portions of them into a VM.
Signed-off-by: Stefano Stabellini <stefa...@xilinx.com>
---
Changes in v5:
- remove unneeded cast
- remove unneeded strlen check
- don't pass address_cells, size_cells, depth to device_tree_for_each_node
Changes in v4:
- depth + 1 in process_reserved_memory_node
- pass address_cells and size_cells to device_tree_for_each_node
- pass struct meminfo * instead of a boolean to process_memory_node
- improve in-code comment
- use a separate process_reserved_memory_node (separate from
process_memory_node) function wrapper to have different error handling
Changes in v3:
- match only /reserved-memory
- put the warning back in place for reg not present on a normal memory
region
- refuse to continue once we reach the max number of reserved memory
regions
Changes in v2:
- call process_memory_node from process_reserved_memory_node to avoid
duplication
---
xen/arch/arm/bootfdt.c | 41 +++++++++++++++++++++++++++++++------
xen/include/asm-arm/setup.h | 1 +
2 files changed, 36 insertions(+), 6 deletions(-)
diff --git a/xen/arch/arm/bootfdt.c b/xen/arch/arm/bootfdt.c
index 590b14304c..0b0e22a3d0 100644
--- a/xen/arch/arm/bootfdt.c
+++ b/xen/arch/arm/bootfdt.c
@@ -136,6 +136,7 @@ static int __init process_memory_node(const void *fdt, int
node,
const __be32 *cell;
paddr_t start, size;
u32 reg_cells = address_cells + size_cells;
+ struct meminfo *mem = data;
if ( address_cells < 1 || size_cells < 1 )
return -ENOENT;
@@ -147,21 +148,46 @@ static int __init process_memory_node(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 && bootinfo.mem.nr_banks < NR_MEM_BANKS; i++ )
+ for ( i = 0; i < banks && mem->nr_banks < NR_MEM_BANKS; i++ )
{
device_tree_get_reg(&cell, address_cells, size_cells, &start, &size);
if ( !size )
continue;
- bootinfo.mem.bank[bootinfo.mem.nr_banks].start = start;
- bootinfo.mem.bank[bootinfo.mem.nr_banks].size = size;
- bootinfo.mem.nr_banks++;
+ mem->bank[mem->nr_banks].start = start;
+ mem->bank[mem->nr_banks].size = size;
+ mem->nr_banks++;
}
- if ( bootinfo.mem.nr_banks == NR_MEM_BANKS )
+ if ( mem->nr_banks == NR_MEM_BANKS )
Assuming the off-by-one is going to be fixed in patch #2:
Acked-by: Julien Grall <julien.gr...@arm.com>
Cheers,
--
Julien Grall
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