Kirill A. Shutemov 45b13b424f x86/boot/compressed/64: Do not corrupt EDX on EFER.LME=1 setting ...

RDMSR in the trampoline code overwrites EDX but that register is used
to indicate whether 5-level paging has to be enabled and if clobbered,
leads to failure to boot on a 5-level paging machine.

Preserve EDX on the stack while we are dealing with EFER.

Fixes: b677dfae5a ("x86/boot/compressed/64: Set EFER.LME=1 in 32-bit trampoline before returning to long mode")
Reported-by: Kyle D Pelton <kyle.d.pelton@intel.com>
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Signed-off-by: Borislav Petkov <bp@suse.de>
Cc: dave.hansen@linux.intel.com
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Wei Huang <wei@redhat.com>
Cc: x86-ml <x86@kernel.org>
Link: https://lkml.kernel.org/r/20190206115253.1907-1-kirill.shutemov@linux.intel.com

2019-02-06 18:56:18 +01:00

..

.gitignore

x86, boot: add new generated files to the appropriate .gitignore files

2009-06-02 21:13:30 -07:00

cmdline.c

x86/mm: Introduce the 'no5lvl' kernel parameter

2018-05-19 11:56:57 +02:00

cpuflags.c

License cleanup: add SPDX GPL-2.0 license identifier to files with no license

2017-11-02 11:10:55 +01:00

early_serial_console.c

x86, boot: Don't compile early_serial_console.c when !CONFIG_EARLY_PRINTK

2014-08-17 14:58:24 -07:00

eboot.c

x86/efi: Allocate e820 buffer before calling efi_exit_boot_service

2018-11-30 08:30:07 +01:00

eboot.h

efi/x86: Align efi_uga_draw_protocol typedef names to convention

2018-07-22 14:13:42 +02:00

efi_stub_32.S

License cleanup: add SPDX GPL-2.0 license identifier to files with no license

2017-11-02 11:10:55 +01:00

efi_stub_64.S

x86/efi: Avoid triple faults during EFI mixed mode calls

2015-02-13 15:42:56 +00:00

efi_thunk_64.S

License cleanup: add SPDX GPL-2.0 license identifier to files with no license

2017-11-02 11:10:55 +01:00

error.c

License cleanup: add SPDX GPL-2.0 license identifier to files with no license

2017-11-02 11:10:55 +01:00

error.h

License cleanup: add SPDX GPL-2.0 license identifier to files with no license

2017-11-02 11:10:55 +01:00

head_32.S

License cleanup: add SPDX GPL-2.0 license identifier to files with no license

2017-11-02 11:10:55 +01:00

head_64.S

x86/boot/compressed/64: Do not corrupt EDX on EFER.LME=1 setting

2019-02-06 18:56:18 +01:00

kaslr_64.c

x86/mm: Decouple dynamic __PHYSICAL_MASK from AMD SME

2018-06-06 13:38:01 +02:00

kaslr.c

x86/boot/KASLR: Remove return value from handle_mem_options()

2018-09-10 15:07:11 +02:00

Makefile

kbuild: remove redundant target cleaning on failure

2019-01-06 09:46:51 +09:00

mem_encrypt.S

x86/boot: Fix kexec booting failure in the SEV bit detection code

2018-09-27 19:35:03 +02:00

misc.c

Merge tag 'v4.16-rc7' into x86/mm, to fix up conflict

2018-03-27 08:43:39 +02:00

misc.h

x86/paravirt: Introduce new config option PARAVIRT_XXL

2018-09-03 16:50:35 +02:00

mkpiggy.c

x86/KASLR: Clean up unused code from old 'run_size' and rename it to 'kernel_total_size'

2016-04-29 11:03:30 +02:00

pgtable_64.c

x86/boot/compressed/64: Validate trampoline placement against E820

2018-08-02 14:22:22 +02:00

pgtable.h

x86/boot/compressed/64: Set EFER.LME=1 in 32-bit trampoline before returning to long mode

2019-01-29 21:58:59 +01:00

string.c

License cleanup: add SPDX GPL-2.0 license identifier to files with no license

2017-11-02 11:10:55 +01:00

vmlinux.lds.S

License cleanup: add SPDX GPL-2.0 license identifier to files with no license

2017-11-02 11:10:55 +01:00