On Mon, Oct 28, 2024 at 06:08:04PM +0200, Alexander Shishkin wrote: > This reverts commit 3267cb6d3a174ff83d6287dcd5b0047bbd912452. > > LASS mitigates the Spectre based on LAM (SLAM) [1] and an earlier > commit made LAM depend on LASS, so we no longer need to disable LAM at > compile time, so revert the commit that disables LAM. > > [1] https://download.vusec.net/papers/slam_sp24.pdf > > Signed-off-by: Alexander Shishkin <alexander.shishkin@xxxxxxxxxxxxxxx> > CC: Pawan Gupta <pawan.kumar.gupta@xxxxxxxxxxxxxxx> Before re-enabling LAM, you need to uncomment X86_FEATURE_LAM check in arch/x86/kernel/cpu/common.c introduced in recent 86e6b1547b3d ("x86: fix user address masking non-canonical speculation issue"). -- Kiryl Shutsemau / Kirill A. Shutemov
