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| author |   Kirill A. Shutemov <kirill.shutemov@linux.intel.com> | 2019-02-06 14:52:53 +0300 |
|---|---|---|
| committer |   Borislav Petkov <bp@suse.de> | 2019-02-06 18:56:18 +0100 |
| commit | 45b13b424faafb81c8c44541f093a682fdabdefc (patch) | |
| tree | bfe1aa77e018ab73e84ef5e0eeb560d4e4d05adc /arch/x86/mm/pageattr.c | |
| parent | x86/MCE: Initialize mce.bank in the case of a fatal error in mce_no_way_out() (diff) | |
| download | wireguard-linux-45b13b424faafb81c8c44541f093a682fdabdefc.tar.xz wireguard-linux-45b13b424faafb81c8c44541f093a682fdabdefc.zip | |
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: b677dfae5aa1 ("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
Diffstat (limited to '')
0 files changed, 0 insertions, 0 deletions