Commit 6f599d84 authored by Lianbo Jiang's avatar Lianbo Jiang Committed by Borislav Petkov
Browse files

x86/kdump: Always reserve the low 1M when the crashkernel option is specified

On x86, purgatory() copies the first 640K of memory to a backup region
because the kernel needs those first 640K for the real mode trampoline
during boot, among others.

However, when SME is enabled, the kernel cannot properly copy the old
memory to the backup area but reads only its encrypted contents. The
result is that the crash tool gets invalid pointers when parsing vmcore:

  crash> kmem -s|grep -i invalid
  kmem: dma-kmalloc-512: slab:ffffd77680001c00 invalid freepointer:a6086ac099f0c5a4
  kmem: dma-kmalloc-512: slab:ffffd77680001c00 invalid freepointer:a6086ac099f0c5a4

So reserve the remaining low 1M memory when the crashkernel option is
specified (after reserving real mode memory) so that allocated memory
does not fall into the low 1M area and thus the copying of the contents
of the first 640k to a backup region in purgatory() can be avoided

This way, it does not need to be included in crash dumps or used for
anything except the trampolines that must live in the low 1M.

 [ bp: Heavily rewrite commit message, flip check logic in

Signed-off-by: default avatarLianbo Jiang <>
Signed-off-by: default avatarBorislav Petkov <>
Cc: Dave Young <>
Cc: "H. Peter Anvin" <>
Cc: Ingo Molnar <>
Cc: Jürgen Gross <>
Cc: Peter Zijlstra <>
Cc: Thomas Gleixner <>
Cc: Tom Lendacky <>
Cc: x86-ml <>
parent 112eee5d
......@@ -10,4 +10,10 @@ int crash_setup_memmap_entries(struct kimage *image,
struct boot_params *params);
void crash_smp_send_stop(void);
void __init crash_reserve_low_1M(void);
static inline void __init crash_reserve_low_1M(void) { }
#endif /* _ASM_X86_CRASH_H */
......@@ -24,6 +24,7 @@
#include <linux/export.h>
#include <linux/slab.h>
#include <linux/vmalloc.h>
#include <linux/memblock.h>
#include <asm/processor.h>
#include <asm/hardirq.h>
......@@ -39,6 +40,7 @@
#include <asm/virtext.h>
#include <asm/intel_pt.h>
#include <asm/crash.h>
#include <asm/cmdline.h>
/* Used while preparing memory map entries for second kernel */
struct crash_memmap_data {
......@@ -68,6 +70,19 @@ static inline void cpu_crash_vmclear_loaded_vmcss(void)
* When the crashkernel option is specified, only use the low
* 1M for the real mode trampoline.
void __init crash_reserve_low_1M(void)
if (cmdline_find_option(boot_command_line, "crashkernel", NULL, 0) < 0)
memblock_reserve(0, 1<<20);
pr_info("Reserving the low 1M of memory for crashkernel\n");
#if defined(CONFIG_SMP) && defined(CONFIG_X86_LOCAL_APIC)
static void kdump_nmi_callback(int cpu, struct pt_regs *regs)
......@@ -8,6 +8,7 @@
#include <asm/pgtable.h>
#include <asm/realmode.h>
#include <asm/tlbflush.h>
#include <asm/crash.h>
struct real_mode_header *real_mode_header;
u32 *trampoline_cr4_features;
......@@ -34,6 +35,7 @@ void __init reserve_real_mode(void)
memblock_reserve(mem, size);
static void __init setup_real_mode(void)
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