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/checker-valid.sh | 19 +++++++++++++++++++ 1 file changed, 19 insertions(+) create mode 100755 scripts/checker-valid.sh (limited to 'scripts/checker-valid.sh') diff --git a/scripts/checker-valid.sh b/scripts/checker-valid.sh new file mode 100755 index 000000000..625a789ed --- /dev/null +++ b/scripts/checker-valid.sh @@ -0,0 +1,19 @@ +#!/bin/sh -eu +# SPDX-License-Identifier: GPL-2.0 + +[ ! -x "$(command -v "$1")" ] && exit 1 + +tmp_file=$(mktemp) +trap "rm -f $tmp_file" EXIT + +cat << EOF >$tmp_file +static inline int u(const int *q) +{ + __typeof_unqual__(*q) v = *q; + return v; +} +EOF + +# sparse happily exits with 0 on error so validate +# there is none on stderr. Use awk as grep is a pain with sh -e +$@ $tmp_file 2>&1 | awk -v c=1 '/error/{c=0}END{print c}' -- cgit v1.3.1