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/datalink.h | 26 ++++++++++++++++++++++++++ 1 file changed, 26 insertions(+) create mode 100644 include/net/datalink.h (limited to 'include/net/datalink.h') diff --git a/include/net/datalink.h b/include/net/datalink.h new file mode 100644 index 000000000..6c529a40e --- /dev/null +++ b/include/net/datalink.h @@ -0,0 +1,26 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +#ifndef _NET_INET_DATALINK_H_ +#define _NET_INET_DATALINK_H_ + +#include + +struct llc_sap; +struct net_device; +struct packet_type; +struct sk_buff; + +struct datalink_proto { + unsigned char type[8]; + + struct llc_sap *sap; + + unsigned short header_length; + + int (*rcvfunc)(struct sk_buff *, struct net_device *, + struct packet_type *, struct net_device *); + int (*request)(struct datalink_proto *, struct sk_buff *, + const unsigned char *); + struct list_head node; +}; + +#endif -- cgit v1.3.1