[PATCH v4 3/3] xen/arm: Extend the memory overlap check to include EfiACPIReclaimMemory

[Henry Wang <Henry.Wang@xxxxxxx>]

Similarly as the static regions and boot modules, memory regions with
EfiACPIReclaimMemory type (defined in bootinfo.acpi if CONFIG_ACPI is
enabled) should also not be overlapping with memory regions in
bootinfo.reserved_mem and bootinfo.modules.

Therefore, this commit reuses the `meminfo_overlap_check()` to further
extends the check in function `check_reserved_regions_overlap()` so that
memory regions in bootinfo.acpi are included. If any error occurs in the
extended `check_reserved_regions_overlap()`, the `meminfo_add_bank()`
defined in `efi-boot.h` will return early.

Signed-off-by: Henry Wang <Henry.Wang@xxxxxxx>
Reviewed-by: Stefano Stabellini <sstabellini@xxxxxxxxxx>
---
v3 -> v4:
1. No changes.
v2 -> v3:
1. Rebase on top of patch #1 and #2.
2. Add Stefano's Reviewed-by tag.
v1 -> v2:
1. Rebase on top of patch #1 and #2.
---
 xen/arch/arm/efi/efi-boot.h | 10 ++++++++--
 xen/arch/arm/setup.c        |  6 ++++++
 2 files changed, 14 insertions(+), 2 deletions(-)

diff --git a/xen/arch/arm/efi/efi-boot.h b/xen/arch/arm/efi/efi-boot.h
index 223db0c4da..bb64925d70 100644
--- a/xen/arch/arm/efi/efi-boot.h
+++ b/xen/arch/arm/efi/efi-boot.h
@@ -161,13 +161,19 @@ static bool __init meminfo_add_bank(struct meminfo *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 )
         return false;
+#ifdef CONFIG_ACPI
+    if ( check_reserved_regions_overlap(start, size) )
+        return false;
+#endif
 
     bank = &mem->bank[mem->nr_banks];
-    bank->start = desc->PhysicalStart;
-    bank->size = desc->NumberOfPages * EFI_PAGE_SIZE;
+    bank->start = start;
+    bank->size = size;
 
     mem->nr_banks++;
 
diff --git a/xen/arch/arm/setup.c b/xen/arch/arm/setup.c
index 1ea42a0386..6f9f4d8c8a 100644
--- a/xen/arch/arm/setup.c
+++ b/xen/arch/arm/setup.c
@@ -350,6 +350,12 @@ bool __init check_reserved_regions_overlap(paddr_t 
region_start,
                                    region_start, region_size) )
         return true;
 
+#ifdef CONFIG_ACPI
+    /* Check if input region is overlapping with ACPI EfiACPIReclaimMemory */
+    if ( meminfo_overlap_check(&bootinfo.acpi, region_start, region_size) )
+        return true;
+#endif
+
     return false;
 }
 
-- 
2.25.1