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 --- include/net/netevent.h | 39 +++++++++++++++++++++++++++++++++++++++ 1 file changed, 39 insertions(+) create mode 100644 include/net/netevent.h (limited to 'include/net/netevent.h') diff --git a/include/net/netevent.h b/include/net/netevent.h new file mode 100644 index 000000000..1be3757a8 --- /dev/null +++ b/include/net/netevent.h @@ -0,0 +1,39 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +#ifndef _NET_EVENT_H +#define _NET_EVENT_H + +/* + * Generic netevent notifiers + * + * Authors: + * Tom Tucker + * Steve Wise + * + * Changes: + */ + +struct dst_entry; +struct neighbour; +struct notifier_block ; + +struct netevent_redirect { + struct dst_entry *old; + struct dst_entry *new; + struct neighbour *neigh; + const void *daddr; +}; + +enum netevent_notif_type { + NETEVENT_NEIGH_UPDATE = 1, /* arg is struct neighbour ptr */ + NETEVENT_REDIRECT, /* arg is struct netevent_redirect ptr */ + NETEVENT_DELAY_PROBE_TIME_UPDATE, /* arg is struct neigh_parms ptr */ + NETEVENT_IPV4_MPATH_HASH_UPDATE, /* arg is struct net ptr */ + NETEVENT_IPV6_MPATH_HASH_UPDATE, /* arg is struct net ptr */ + NETEVENT_IPV4_FWD_UPDATE_PRIORITY_UPDATE, /* arg is struct net ptr */ +}; + +int register_netevent_notifier(struct notifier_block *nb); +int unregister_netevent_notifier(struct notifier_block *nb); +int call_netevent_notifiers(unsigned long val, void *v); + +#endif -- cgit v1.3.1