arm64/boot: Disable trapping of PMZR_EL0 writes to EL2grafted

__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 <fuad.tabba@linux.dev>
Reviewed-by: Anshuman Khandual <anshuman.khandual@arm.com>
Reviewed-by: Oliver Upton <oupton@kernel.org>
Signed-off-by: Will Deacon <will@kernel.org>

1 files changed, 26 insertions, 0 deletions

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 <linux/list.h>
+
+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