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| author | Chenyi Qiang <chenyi.qiang@intel.com> | 2022-08-02 06:32:06 +0300 |
|---|---|---|
| committer | Ingo Molnar <mingo@kernel.org> | 2022-08-02 14:42:00 +0300 |
| commit | ffa6482e461ff550325356ae705b79e256702ea9 (patch) | |
| tree | e191f4506dd6a5a482ad5962a031622346601ae8 /arch/x86/kernel/machine_kexec_64.c | |
| parent | 9de1f9c8ca5100a02a2e271bdbde36202e251b4b (diff) | |
| download | linux-ffa6482e461ff550325356ae705b79e256702ea9.tar.xz | |
x86/bus_lock: Don't assume the init value of DEBUGCTLMSR.BUS_LOCK_DETECT to be zero
It's possible that this kernel has been kexec'd from a kernel that
enabled bus lock detection, or (hypothetically) BIOS/firmware has set
DEBUGCTLMSR_BUS_LOCK_DETECT.
Disable bus lock detection explicitly if not wanted.
Fixes: ebb1064e7c2e ("x86/traps: Handle #DB for bus lock")
Signed-off-by: Chenyi Qiang <chenyi.qiang@intel.com>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Reviewed-by: Tony Luck <tony.luck@intel.com>
Link: https://lore.kernel.org/r/20220802033206.21333-1-chenyi.qiang@intel.com
Diffstat (limited to 'arch/x86/kernel/machine_kexec_64.c')
0 files changed, 0 insertions, 0 deletions