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, 187 insertions, 0 deletions

diff --git a/include/trace/events/bridge.h b/include/trace/events/bridge.h
new file mode 100644
index 000000000..3fe4725c8
--- /dev/null
+++ b/include/trace/events/bridge.h
@@ -0,0 +1,187 @@
+#undef TRACE_SYSTEM
+#define TRACE_SYSTEM bridge
+
+#if !defined(_TRACE_BRIDGE_H) || defined(TRACE_HEADER_MULTI_READ)
+#define _TRACE_BRIDGE_H
+
+#include <linux/netdevice.h>
+#include <linux/tracepoint.h>
+
+#include "../../../net/bridge/br_private.h"
+
+TRACE_EVENT(br_fdb_add,
+
+	TP_PROTO(struct ndmsg *ndm, struct net_device *dev,
+		 const unsigned char *addr, u16 vid, u16 nlh_flags),
+
+	TP_ARGS(ndm, dev, addr, vid, nlh_flags),
+
+	TP_STRUCT__entry(
+		__field(u8, ndm_flags)
+		__string(dev, dev->name)
+		__array(unsigned char, addr, ETH_ALEN)
+		__field(u16, vid)
+		__field(u16, nlh_flags)
+	),
+
+	TP_fast_assign(
+		__assign_str(dev);
+		memcpy(__entry->addr, addr, ETH_ALEN);
+		__entry->vid = vid;
+		__entry->nlh_flags = nlh_flags;
+		__entry->ndm_flags = ndm->ndm_flags;
+	),
+
+	TP_printk("dev %s addr %02x:%02x:%02x:%02x:%02x:%02x vid %u nlh_flags %04x ndm_flags %02x",
+		  __get_str(dev), __entry->addr[0], __entry->addr[1],
+		  __entry->addr[2], __entry->addr[3], __entry->addr[4],
+		  __entry->addr[5], __entry->vid,
+		  __entry->nlh_flags, __entry->ndm_flags)
+);
+
+TRACE_EVENT(br_fdb_external_learn_add,
+
+	TP_PROTO(struct net_bridge *br, struct net_bridge_port *p,
+		 const unsigned char *addr, u16 vid),
+
+	TP_ARGS(br, p, addr, vid),
+
+	TP_STRUCT__entry(
+		__string(br_dev, br->dev->name)
+		__string(dev, p ? p->dev->name : "null")
+		__array(unsigned char, addr, ETH_ALEN)
+		__field(u16, vid)
+	),
+
+	TP_fast_assign(
+		__assign_str(br_dev);
+		__assign_str(dev);
+		memcpy(__entry->addr, addr, ETH_ALEN);
+		__entry->vid = vid;
+	),
+
+	TP_printk("br_dev %s port %s addr %02x:%02x:%02x:%02x:%02x:%02x vid %u",
+		  __get_str(br_dev), __get_str(dev), __entry->addr[0],
+		  __entry->addr[1], __entry->addr[2], __entry->addr[3],
+		  __entry->addr[4], __entry->addr[5], __entry->vid)
+);
+
+TRACE_EVENT(fdb_delete,
+
+	TP_PROTO(struct net_bridge *br, struct net_bridge_fdb_entry *f),
+
+	TP_ARGS(br, f),
+
+	TP_STRUCT__entry(
+		__string(br_dev, br->dev->name)
+		__string(dev, f->dst ? f->dst->dev->name : "null")
+		__array(unsigned char, addr, ETH_ALEN)
+		__field(u16, vid)
+	),
+
+	TP_fast_assign(
+		__assign_str(br_dev);
+		__assign_str(dev);
+		memcpy(__entry->addr, f->key.addr.addr, ETH_ALEN);
+		__entry->vid = f->key.vlan_id;
+	),
+
+	TP_printk("br_dev %s dev %s addr %02x:%02x:%02x:%02x:%02x:%02x vid %u",
+		  __get_str(br_dev), __get_str(dev), __entry->addr[0],
+		  __entry->addr[1], __entry->addr[2], __entry->addr[3],
+		  __entry->addr[4], __entry->addr[5], __entry->vid)
+);
+
+TRACE_EVENT(br_fdb_update,
+
+	TP_PROTO(struct net_bridge *br, struct net_bridge_port *source,
+		 const unsigned char *addr, u16 vid, unsigned long flags),
+
+	TP_ARGS(br, source, addr, vid, flags),
+
+	TP_STRUCT__entry(
+		__string(br_dev, br->dev->name)
+		__string(dev, source->dev->name)
+		__array(unsigned char, addr, ETH_ALEN)
+		__field(u16, vid)
+		__field(unsigned long, flags)
+	),
+
+	TP_fast_assign(
+		__assign_str(br_dev);
+		__assign_str(dev);
+		memcpy(__entry->addr, addr, ETH_ALEN);
+		__entry->vid = vid;
+		__entry->flags = flags;
+	),
+
+	TP_printk("br_dev %s source %s addr %02x:%02x:%02x:%02x:%02x:%02x vid %u flags 0x%lx",
+		  __get_str(br_dev), __get_str(dev), __entry->addr[0],
+		  __entry->addr[1], __entry->addr[2], __entry->addr[3],
+		  __entry->addr[4], __entry->addr[5], __entry->vid,
+		  __entry->flags)
+);
+
+TRACE_EVENT(br_mdb_full,
+
+	TP_PROTO(const struct net_device *dev,
+		 const struct br_ip *group),
+
+	TP_ARGS(dev, group),
+
+	TP_STRUCT__entry(
+		__string(dev, dev->name)
+		__field(int, af)
+		__field(u16, vid)
+		__array(__u8, src, 16)
+		__array(__u8, grp, 16)
+		__array(__u8, grpmac, ETH_ALEN) /* For af == 0. */
+	),
+
+	TP_fast_assign(
+		struct in6_addr *in6;
+
+		__assign_str(dev);
+		__entry->vid = group->vid;
+
+		if (!group->proto) {
+			__entry->af = 0;
+
+			memset(__entry->src, 0, sizeof(__entry->src));
+			memset(__entry->grp, 0, sizeof(__entry->grp));
+			memcpy(__entry->grpmac, group->dst.mac_addr, ETH_ALEN);
+		} else if (group->proto == htons(ETH_P_IP)) {
+			__entry->af = AF_INET;
+
+			in6 = (struct in6_addr *)__entry->src;
+			ipv6_addr_set_v4mapped(group->src.ip4, in6);
+
+			in6 = (struct in6_addr *)__entry->grp;
+			ipv6_addr_set_v4mapped(group->dst.ip4, in6);
+
+			memset(__entry->grpmac, 0, ETH_ALEN);
+
+#if IS_ENABLED(CONFIG_IPV6)
+		} else {
+			__entry->af = AF_INET6;
+
+			in6 = (struct in6_addr *)__entry->src;
+			*in6 = group->src.ip6;
+
+			in6 = (struct in6_addr *)__entry->grp;
+			*in6 = group->dst.ip6;
+
+			memset(__entry->grpmac, 0, ETH_ALEN);
+#endif
+		}
+	),
+
+	TP_printk("dev %s af %u src %pI6c grp %pI6c/%pM vid %u",
+		  __get_str(dev), __entry->af, __entry->src, __entry->grp,
+		  __entry->grpmac, __entry->vid)
+);
+
+#endif /* _TRACE_BRIDGE_H */
+
+/* This part must be outside protection */
+#include <trace/define_trace.h>