@@ -107,7 +107,7 @@ endif
vmlinux-objs-$(CONFIG_ACPI) += $(obj)/acpi.o
vmlinux-objs-$(CONFIG_INTEL_TDX_GUEST) += $(obj)/tdx.o $(obj)/tdcall.o
-vmlinux-objs-$(CONFIG_UNACCEPTED_MEMORY) += $(obj)/bitmap.o $(obj)/mem.o
+vmlinux-objs-$(CONFIG_UNACCEPTED_MEMORY) += $(obj)/bitmap.o $(obj)/find.o $(obj)/mem.o
vmlinux-objs-$(CONFIG_EFI) += $(obj)/efi.o
vmlinux-objs-$(CONFIG_EFI_MIXED) += $(obj)/efi_mixed.o
@@ -32,6 +32,7 @@ typedef struct {
} efi_table_hdr_t;
#define EFI_CONVENTIONAL_MEMORY 7
+#define EFI_UNACCEPTED_MEMORY 15
#define EFI_MEMORY_MORE_RELIABLE \
((u64)0x0000000000010000ULL) /* higher reliability */
@@ -672,6 +672,28 @@ static bool process_mem_region(struct mem_vector *region,
}
#ifdef CONFIG_EFI
+
+/*
+ * Only EFI_CONVENTIONAL_MEMORY and EFI_UNACCEPTED_MEMORY (if supported) are
+ * guaranteed to be free.
+ *
+ * It is more conservative in picking free memory than the EFI spec allows:
+ *
+ * According to the spec, EFI_BOOT_SERVICES_{CODE|DATA} are also free memory
+ * and thus available to place the kernel image into, but in practice there's
+ * firmware where using that memory leads to crashes.
+ */
+static inline bool memory_type_is_free(efi_memory_desc_t *md)
+{
+ if (md->type == EFI_CONVENTIONAL_MEMORY)
+ return true;
+
+ if (md->type == EFI_UNACCEPTED_MEMORY)
+ return IS_ENABLED(CONFIG_UNACCEPTED_MEMORY);
+
+ return false;
+}
+
/*
* Returns true if we processed the EFI memmap, which we prefer over the E820
* table if it is available.
@@ -716,18 +738,7 @@ process_efi_entries(unsigned long minimum, unsigned long image_size)
for (i = 0; i < nr_desc; i++) {
md = efi_early_memdesc_ptr(pmap, e->efi_memdesc_size, i);
- /*
- * Here we are more conservative in picking free memory than
- * the EFI spec allows:
- *
- * According to the spec, EFI_BOOT_SERVICES_{CODE|DATA} are also
- * free memory and thus available to place the kernel image into,
- * but in practice there's firmware where using that memory leads
- * to crashes.
- *
- * Only EFI_CONVENTIONAL_MEMORY is guaranteed to be free.
- */
- if (md->type != EFI_CONVENTIONAL_MEMORY)
+ if (!memory_type_is_free(md))
continue;
if (efi_soft_reserve_enabled() &&
@@ -3,12 +3,15 @@
#include "../cpuflags.h"
#include "bitmap.h"
#include "error.h"
+#include "find.h"
#include "math.h"
#define PMD_SHIFT 21
#define PMD_SIZE (_AC(1, UL) << PMD_SHIFT)
#define PMD_MASK (~(PMD_SIZE - 1))
+extern struct boot_params *boot_params;
+
static inline void __accept_memory(phys_addr_t start, phys_addr_t end)
{
/* Platform-specific memory-acceptance call goes here */
@@ -71,3 +74,18 @@ void process_unaccepted_memory(struct boot_params *params, u64 start, u64 end)
bitmap_set((unsigned long *)params->unaccepted_memory,
start / PMD_SIZE, (end - start) / PMD_SIZE);
}
+
+void accept_memory(phys_addr_t start, phys_addr_t end)
+{
+ unsigned long range_start, range_end;
+ unsigned long *bitmap, bitmap_size;
+
+ bitmap = (unsigned long *)boot_params->unaccepted_memory;
+ range_start = start / PMD_SIZE;
+ bitmap_size = DIV_ROUND_UP(end, PMD_SIZE);
+
+ for_each_set_bitrange_from(range_start, range_end, bitmap, bitmap_size) {
+ __accept_memory(range_start * PMD_SIZE, range_end * PMD_SIZE);
+ bitmap_clear(bitmap, range_start, range_end - range_start);
+ }
+}
@@ -455,6 +455,12 @@ asmlinkage __visible void *extract_kernel(void *rmode, memptr heap,
#endif
debug_putstr("\nDecompressing Linux... ");
+
+ if (boot_params->unaccepted_memory) {
+ debug_putstr("Accepting memory... ");
+ accept_memory(__pa(output), __pa(output) + needed_size);
+ }
+
__decompress(input_data, input_len, NULL, NULL, output, output_len,
NULL, error);
entry_offset = parse_elf(output);
@@ -247,4 +247,10 @@ static inline unsigned long efi_find_vendor_table(struct boot_params *bp,
}
#endif /* CONFIG_EFI */
+#ifdef CONFIG_UNACCEPTED_MEMORY
+void accept_memory(phys_addr_t start, phys_addr_t end);
+#else
+static inline void accept_memory(phys_addr_t start, phys_addr_t end) {}
+#endif
+
#endif /* BOOT_COMPRESSED_MISC_H */
@@ -7,4 +7,6 @@ struct boot_params;
void process_unaccepted_memory(struct boot_params *params, u64 start, u64 num);
+void accept_memory(phys_addr_t start, phys_addr_t end);
+
#endif