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Commit a5d90c92 authored by Borislav Petkov's avatar Borislav Petkov Committed by Matt Fleming
Browse files

x86/efi: Quirk out SGI UV 



Alex reported hitting the following BUG after the EFI 1:1 virtual
mapping work was merged,

 kernel BUG at arch/x86/mm/init_64.c:351!
 invalid opcode: 0000 [#1] SMP
 Call Trace:
  [<ffffffff818aa71d>] init_extra_mapping_uc+0x13/0x15
  [<ffffffff818a5e20>] uv_system_init+0x22b/0x124b
  [<ffffffff8108b886>] ? clockevents_register_device+0x138/0x13d
  [<ffffffff81028dbb>] ? setup_APIC_timer+0xc5/0xc7
  [<ffffffff8108b620>] ? clockevent_delta2ns+0xb/0xd
  [<ffffffff818a3a92>] ? setup_boot_APIC_clock+0x4a8/0x4b7
  [<ffffffff8153d955>] ? printk+0x72/0x74
  [<ffffffff818a1757>] native_smp_prepare_cpus+0x389/0x3d6
  [<ffffffff818957bc>] kernel_init_freeable+0xb7/0x1fb
  [<ffffffff81535530>] ? rest_init+0x74/0x74
  [<ffffffff81535539>] kernel_init+0x9/0xff
  [<ffffffff81541dfc>] ret_from_fork+0x7c/0xb0
  [<ffffffff81535530>] ? rest_init+0x74/0x74

Getting this thing to work with the new mapping scheme would need more
work, so automatically switch to the old memmap layout for SGI UV.

Acked-by: default avatarRuss Anderson <rja@sgi.com>
Cc: Alex Thorlton <athorlton@sgi.com
Signed-off-by: default avatarBorislav Petkov <bp@suse.de>
Signed-off-by: default avatarMatt Fleming <matt.fleming@intel.com>
parent 09503379

arch/x86/include/asm/efi.h

+1 −0
Original line number Diff line number Diff line
@@ -134,6 +134,7 @@ extern void efi_setup_page_tables(void); 
extern void __init old_map_region(efi_memory_desc_t *md);

extern void __init runtime_code_page_mkexec(void);

extern void __init efi_runtime_mkexec(void);

extern void __init efi_apply_memmap_quirks(void);



struct efi_setup_data {

	u64 fw_vendor;

arch/x86/kernel/setup.c

+2 −8
Original line number Diff line number Diff line
@@ -1239,14 +1239,8 @@ void __init setup_arch(char **cmdline_p) 
	register_refined_jiffies(CLOCK_TICK_RATE);



#ifdef CONFIG_EFI

	/* Once setup is done above, unmap the EFI memory map on

	 * mismatched firmware/kernel archtectures since there is no

	 * support for runtime services.

	 */

	if (efi_enabled(EFI_BOOT) && !efi_is_native()) {

		pr_info("efi: Setup done, disabling due to 32/64-bit mismatch\n");

		efi_unmap_memmap();

	}

	if (efi_enabled(EFI_BOOT))

		efi_apply_memmap_quirks();

#endif

}

arch/x86/platform/efi/efi.c

+20 −0
Original line number Diff line number Diff line
@@ -52,6 +52,7 @@ 
#include <asm/tlbflush.h>

#include <asm/x86_init.h>

#include <asm/rtc.h>

#include <asm/uv/uv.h>



#define EFI_DEBUG
@@ -1210,3 +1211,22 @@ static int __init parse_efi_cmdline(char *str) 
	return 0;

}

early_param("efi", parse_efi_cmdline);



void __init efi_apply_memmap_quirks(void)

{

	/*

	 * Once setup is done earlier, unmap the EFI memory map on mismatched

	 * firmware/kernel architectures since there is no support for runtime

	 * services.

	 */

	if (!efi_is_native()) {

		pr_info("efi: Setup done, disabling due to 32/64-bit mismatch\n");

		efi_unmap_memmap();

	}



	/*

	 * UV doesn't support the new EFI pagetable mapping yet.

	 */

	if (is_uv_system())

		set_bit(EFI_OLD_MEMMAP, &x86_efi_facility);

}