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, 59 insertions, 0 deletions

diff --git a/include/net/af_ieee802154.h b/include/net/af_ieee802154.h
new file mode 100644
index 000000000..c16be82b9
--- /dev/null
+++ b/include/net/af_ieee802154.h
@@ -0,0 +1,59 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+/*
+ * IEEE 802.15.4 interface for userspace
+ *
+ * Copyright 2007, 2008 Siemens AG
+ *
+ * Written by:
+ * Sergey Lapin <slapin@ossfans.org>
+ * Dmitry Eremin-Solenikov <dbaryshkov@gmail.com>
+ */
+
+#ifndef _AF_IEEE802154_H
+#define _AF_IEEE802154_H
+
+#include <linux/socket.h> /* for sa_family_t */
+
+enum {
+	IEEE802154_ADDR_NONE = 0x0,
+	/* RESERVED = 0x01, */
+	IEEE802154_ADDR_SHORT = 0x2, /* 16-bit address + PANid */
+	IEEE802154_ADDR_LONG = 0x3, /* 64-bit address + PANid */
+};
+
+/* address length, octets */
+#define IEEE802154_ADDR_LEN	8
+
+struct ieee802154_addr_sa {
+	int addr_type;
+	u16 pan_id;
+	union {
+		u8 hwaddr[IEEE802154_ADDR_LEN];
+		u16 short_addr;
+	};
+};
+
+#define IEEE802154_PANID_BROADCAST	0xffff
+#define IEEE802154_ADDR_BROADCAST	0xffff
+#define IEEE802154_ADDR_UNDEF		0xfffe
+
+struct sockaddr_ieee802154 {
+	sa_family_t family; /* AF_IEEE802154 */
+	struct ieee802154_addr_sa addr;
+};
+
+/* get/setsockopt */
+#define SOL_IEEE802154	0
+
+#define WPAN_WANTACK		0
+#define WPAN_SECURITY		1
+#define WPAN_SECURITY_LEVEL	2
+#define WPAN_WANTLQI		3
+
+#define WPAN_SECURITY_DEFAULT	0
+#define WPAN_SECURITY_OFF	1
+#define WPAN_SECURITY_ON	2
+
+#define WPAN_SECURITY_LEVEL_DEFAULT	(-1)
+
+#endif