From 2bc6b218717b9d08f466f88209251d54bc09b207 Mon Sep 17 00:00:00 2001 From: Fuad Tabba Date: Tue, 22 Sep 2026 19:14:30 +0100 Subject: arm64/boot: Disable trapping of PMZR_EL0 writes to EL2 __init_el2_fgt2() writes one mask to both HDFGRTR2_EL2 and HDFGWTR2_EL2. PMZR_EL0 is write-only, so its trap bit, nPMZR_EL0, exists only in HDFGWTR2_EL2 and is therefore never set: a PMZR_EL0 write from the host traps to EL2, where the nVHE hypervisor has no handler and BUG()s. The kernel never writes PMZR_EL0, but kernel.perf_user_access=1 has the PMU driver set PMUSERENR_EL0.UEN for a task with a user-read event, so a write from EL0 reaches the trap and takes the host down without a panic message. Accumulate the HDFGWTR2_EL2 bits separately, as __init_el2_fgt() already does for HDFGWTR_EL2, and set nPMZR_EL0 with the other FEAT_PMUv3p9 bits. Fixes: 858c7bfcb35e1 ("arm64/boot: Enable EL2 requirements for FEAT_PMUv3p9") Cc: stable@vger.kernel.org Signed-off-by: Fuad Tabba Reviewed-by: Anshuman Khandual Reviewed-by: Oliver Upton Signed-off-by: Will Deacon --- scripts/livepatch/Makefile | 20 ++++++++++++++++++++ 1 file changed, 20 insertions(+) create mode 100644 scripts/livepatch/Makefile (limited to 'scripts/livepatch/Makefile') diff --git a/scripts/livepatch/Makefile b/scripts/livepatch/Makefile new file mode 100644 index 000000000..17b590213 --- /dev/null +++ b/scripts/livepatch/Makefile @@ -0,0 +1,20 @@ +# SPDX-License-Identifier: GPL-2.0 +# Standalone Makefile for developer tooling (not part of kbuild). + +SHELLCHECK := $(shell which shellcheck 2> /dev/null) + +SRCS := \ + klp-build + +.DEFAULT_GOAL := help +.PHONY: help +help: + @echo " check - Run shellcheck on $(SRCS)" + @echo " help - Show this help message" + +.PHONY: check +check: +ifndef SHELLCHECK + $(error shellcheck is not installed. Please install it to run checks) +endif + @$(SHELLCHECK) $(SHELLCHECK_OPTIONS) $(SRCS) -- cgit v1.3.1