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

..

compressed

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

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

tools

x86/boot: Add missing va_end() to die()

2018-11-28 20:06:07 +01:00

.gitignore

x86/build: Add more generated files to the .gitignore file

2017-11-07 11:22:21 +01:00

a20.c

…

apm.c

…

bioscall.S

…

bitops.h

x86/boot: Use CC_SET()/CC_OUT() instead of open coding it

2018-08-02 14:30:42 +02:00

boot.h

x86/boot: Simplify the detect_memory*() control flow

2018-11-06 21:05:01 +01:00

cmdline.c

…

code16gcc.h

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

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

copy.S

x86/boot: Remove unused copy_*_gs() functions

2017-06-05 09:35:16 +02:00

cpu.c

Revert "x86/boot: Fail the boot if !M486 and CPUID is missing"

2016-12-19 11:54:20 +01:00

cpucheck.c

x86: Clean up 'sizeof x' => 'sizeof(x)'

2018-10-29 07:13:28 +01:00

cpuflags.c

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

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

cpuflags.h

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

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

ctype.h

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: Clean up 'sizeof x' => 'sizeof(x)'

2018-10-29 07:13:28 +01:00

edd.c

x86: Clean up 'sizeof x' => 'sizeof(x)'

2018-10-29 07:13:28 +01:00

genimage.sh

x86/build: Make isoimage work on Debian

2017-12-16 16:23:31 +01:00

header.S

x86/boot: Mostly revert commit ae7e1238e6 ("Add ACPI RSDP address to setup_header")

2018-11-20 09:43:10 +01:00

install.sh

…

main.c

x86: Clean up 'sizeof x' => 'sizeof(x)'

2018-10-29 07:13:28 +01:00

Makefile

x86/build: Factor out fdimage/isoimage generation commands to standalone script

2017-11-07 11:22:20 +01:00

memory.c

x86/boot: Simplify the detect_memory*() control flow

2018-11-06 21:05:01 +01:00

mkcpustr.c

x86/cpufeature: Carve out X86_FEATURE_*

2016-01-30 11:22:17 +01:00

mtools.conf.in

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pm.c

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pmjump.S

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printf.c

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regs.c

x86: Clean up 'sizeof x' => 'sizeof(x)'

2018-10-29 07:13:28 +01:00

setup.ld

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string.c

x86/boot: Use CC_SET()/CC_OUT() instead of open coding it

2018-08-02 14:30:42 +02:00

string.h

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

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

tty.c

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version.c

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vesa.h

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video-bios.c

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video-mode.c

x86/mm: Fix regression with huge pages on PAE

2015-12-04 09:14:27 +01:00

video-vesa.c

x86: Clean up 'sizeof x' => 'sizeof(x)'

2018-10-29 07:13:28 +01:00

video-vga.c

x86: Use ARRAY_SIZE

2017-10-19 16:15:47 +02:00

video.c

x86: Clean up 'sizeof x' => 'sizeof(x)'

2018-10-29 07:13:28 +01:00

video.h

…