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| author | Balbir Singh <sblbir@amazon.com> | 2021-04-26 21:59:11 +0200 |
|---|---|---|
| committer | Thomas Gleixner <tglx@linutronix.de> | 2021-07-28 11:42:24 +0200 |
| commit | 58e106e725eed59896b9141a1c9a917d2f67962a (patch) | |
| tree | ed070e440c19cd31bd32342673065af6b48f636d /arch/Kconfig | |
| parent | 371b09c6fdc436f2c7bb67fc90df5eec8ce90f06 (diff) | |
| download | lwn-58e106e725eed59896b9141a1c9a917d2f67962a.tar.gz lwn-58e106e725eed59896b9141a1c9a917d2f67962a.zip | |
sched: Add task_work callback for paranoid L1D flush
The upcoming paranoid L1D flush infrastructure allows to conditionally
(opt-in) flush L1D in switch_mm() as a defense against potential new side
channels or for paranoia reasons. As the flush makes only sense when a task
runs on a non-SMT enabled core, because SMT siblings share L1, the
switch_mm() logic will kill a task which is flagged for L1D flush when it
is running on a SMT thread.
Add a taskwork callback so switch_mm() can queue a SIG_KILL command which
is invoked when the task tries to return to user space.
Signed-off-by: Balbir Singh <sblbir@amazon.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Link: https://lore.kernel.org/r/20210108121056.21940-1-sblbir@amazon.com
Diffstat (limited to 'arch/Kconfig')
| -rw-r--r-- | arch/Kconfig | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/arch/Kconfig b/arch/Kconfig index 129df498a8e1..98db63496bab 100644 --- a/arch/Kconfig +++ b/arch/Kconfig @@ -1282,6 +1282,9 @@ config ARCH_SPLIT_ARG64 config ARCH_HAS_ELFCORE_COMPAT bool +config ARCH_HAS_PARANOID_L1D_FLUSH + bool + source "kernel/gcov/Kconfig" source "scripts/gcc-plugins/Kconfig" |