This is a note to let you know that I've just added the patch titled
powerpc/powernv: Get L1D flush requirements from device-tree
to the 5.18-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
powerpc-powernv-get-l1d-flush-requirements-from-devi.patch
and it can be found in the queue-5.18 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit d44e938eb67db8f59e1d8f6ca5192ec970a5f67f
Author: Russell Currey <ruscur@xxxxxxxxxx>
Date: Mon Apr 4 20:15:35 2022 +1000
powerpc/powernv: Get L1D flush requirements from device-tree
[ Upstream commit 2efee6adb56159288bce9d1ab51fc9056d7007d4 ]
The device-tree properties no-need-l1d-flush-msr-pr-1-to-0 and
no-need-l1d-flush-kernel-on-user-access are the equivalents of
H_CPU_BEHAV_NO_L1D_FLUSH_ENTRY and H_CPU_BEHAV_NO_L1D_FLUSH_UACCESS
from the H_GET_CPU_CHARACTERISTICS hcall on pseries respectively.
In commit d02fa40d759f ("powerpc/powernv: Remove POWER9 PVR version
check for entry and uaccess flushes") the condition for disabling the
L1D flush on kernel entry and user access was changed from any non-P9
CPU to only checking P7 and P8. Without the appropriate device-tree
checks for newer processors on powernv, these flushes are unnecessarily
enabled on those systems. This patch corrects this.
Fixes: d02fa40d759f ("powerpc/powernv: Remove POWER9 PVR version check for entry and uaccess flushes")
Reported-by: Joel Stanley <joel@xxxxxxxxx>
Signed-off-by: Russell Currey <ruscur@xxxxxxxxxx>
Signed-off-by: Michael Ellerman <mpe@xxxxxxxxxxxxxx>
Link: https://lore.kernel.org/r/20220404101536.104794-1-ruscur@xxxxxxxxxx
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/arch/powerpc/platforms/powernv/setup.c b/arch/powerpc/platforms/powernv/setup.c
index 105d889abd51..378f7e5f18d2 100644
--- a/arch/powerpc/platforms/powernv/setup.c
+++ b/arch/powerpc/platforms/powernv/setup.c
@@ -96,6 +96,12 @@ static void __init init_fw_feat_flags(struct device_node *np)
if (fw_feature_is("disabled", "needs-spec-barrier-for-bound-checks", np))
security_ftr_clear(SEC_FTR_BNDS_CHK_SPEC_BAR);
+
+ if (fw_feature_is("enabled", "no-need-l1d-flush-msr-pr-1-to-0", np))
+ security_ftr_clear(SEC_FTR_L1D_FLUSH_ENTRY);
+
+ if (fw_feature_is("enabled", "no-need-l1d-flush-kernel-on-user-access", np))
+ security_ftr_clear(SEC_FTR_L1D_FLUSH_UACCESS);
}
static void __init pnv_setup_security_mitigations(void)
