@@ -713,11 +713,6 @@ static int __init parse_reservelow(char *p)
early_param("reservelow", parse_reservelow);
-static void __init trim_low_memory_range(void)
-{
- memblock_reserve(0, ALIGN(reserve_low, PAGE_SIZE));
-}
-
static void __init early_reserve_memory(void)
{
/*
@@ -730,10 +725,17 @@ static void __init early_reserve_memory(void)
(unsigned long)__end_of_kernel_reserve - (unsigned long)_text);
/*
- * Make sure page 0 is always reserved because on systems with
- * L1TF its contents can be leaked to user processes.
+ * The first 4Kb of memory is a BIOS owned area, but generally it is
+ * not listed as such in the E820 table.
+ *
+ * Reserve the first memory page and typically some additional
+ * memory (64KiB by default) since some BIOSes are known to corrupt
+ * low memory. See the Kconfig help text for X86_RESERVE_LOW.
+ *
+ * In addition, make sure page 0 is always reserved because on
+ * systems with L1TF its contents can be leaked to user processes.
*/
- memblock_reserve(0, PAGE_SIZE);
+ memblock_reserve(0, ALIGN(reserve_low, PAGE_SIZE));
early_reserve_initrd();
@@ -746,7 +748,6 @@ static void __init early_reserve_memory(void)
reserve_bios_regions();
trim_snb_memory();
- trim_low_memory_range();
}
/*