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, 136 insertions, 0 deletions

diff --git a/include/net/dcbnl.h b/include/net/dcbnl.h
new file mode 100644
index 000000000..42207fc44
--- /dev/null
+++ b/include/net/dcbnl.h
@@ -0,0 +1,136 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+/*
+ * Copyright (c) 2008, Intel Corporation.
+ *
+ * Author: Lucy Liu <lucy.liu@intel.com>
+ */
+
+#ifndef __NET_DCBNL_H__
+#define __NET_DCBNL_H__
+
+#include <linux/dcbnl.h>
+
+struct net_device;
+
+struct dcb_app_type {
+	int	ifindex;
+	struct dcb_app	  app;
+	struct list_head  list;
+	u8	dcbx;
+};
+
+u16 dcb_getrewr(struct net_device *dev, struct dcb_app *app);
+int dcb_setrewr(struct net_device *dev, struct dcb_app *app);
+int dcb_delrewr(struct net_device *dev, struct dcb_app *app);
+
+int dcb_setapp(struct net_device *, struct dcb_app *);
+u8 dcb_getapp(struct net_device *, struct dcb_app *);
+int dcb_ieee_setapp(struct net_device *, struct dcb_app *);
+int dcb_ieee_delapp(struct net_device *, struct dcb_app *);
+u8 dcb_ieee_getapp_mask(struct net_device *, struct dcb_app *);
+
+struct dcb_rewr_prio_pcp_map {
+	u16 map[IEEE_8021QAZ_MAX_TCS];
+};
+
+void dcb_getrewr_prio_pcp_mask_map(const struct net_device *dev,
+				   struct dcb_rewr_prio_pcp_map *p_map);
+
+struct dcb_ieee_app_prio_map {
+	u64 map[IEEE_8021QAZ_MAX_TCS];
+};
+void dcb_ieee_getapp_prio_dscp_mask_map(const struct net_device *dev,
+					struct dcb_ieee_app_prio_map *p_map);
+
+void dcb_getrewr_prio_dscp_mask_map(const struct net_device *dev,
+				    struct dcb_ieee_app_prio_map *p_map);
+
+struct dcb_ieee_app_dscp_map {
+	u8 map[64];
+};
+void dcb_ieee_getapp_dscp_prio_mask_map(const struct net_device *dev,
+					struct dcb_ieee_app_dscp_map *p_map);
+u8 dcb_ieee_getapp_default_prio_mask(const struct net_device *dev);
+
+int dcbnl_ieee_notify(struct net_device *dev, int event, int cmd,
+		      u32 seq, u32 pid);
+int dcbnl_cee_notify(struct net_device *dev, int event, int cmd,
+		     u32 seq, u32 pid);
+
+/*
+ * Ops struct for the netlink callbacks.  Used by DCB-enabled drivers through
+ * the netdevice struct.
+ */
+struct dcbnl_rtnl_ops {
+	/* IEEE 802.1Qaz std */
+	int (*ieee_getets) (struct net_device *, struct ieee_ets *);
+	int (*ieee_setets) (struct net_device *, struct ieee_ets *);
+	int (*ieee_getmaxrate) (struct net_device *, struct ieee_maxrate *);
+	int (*ieee_setmaxrate) (struct net_device *, struct ieee_maxrate *);
+	int (*ieee_getqcn) (struct net_device *, struct ieee_qcn *);
+	int (*ieee_setqcn) (struct net_device *, struct ieee_qcn *);
+	int (*ieee_getqcnstats) (struct net_device *, struct ieee_qcn_stats *);
+	int (*ieee_getpfc) (struct net_device *, struct ieee_pfc *);
+	int (*ieee_setpfc) (struct net_device *, struct ieee_pfc *);
+	int (*ieee_getapp) (struct net_device *, struct dcb_app *);
+	int (*ieee_setapp) (struct net_device *, struct dcb_app *);
+	int (*ieee_delapp) (struct net_device *, struct dcb_app *);
+	int (*ieee_peer_getets) (struct net_device *, struct ieee_ets *);
+	int (*ieee_peer_getpfc) (struct net_device *, struct ieee_pfc *);
+
+	/* CEE std */
+	u8   (*getstate)(struct net_device *);
+	u8   (*setstate)(struct net_device *, u8);
+	void (*getpermhwaddr)(struct net_device *, u8 *);
+	void (*setpgtccfgtx)(struct net_device *, int, u8, u8, u8, u8);
+	void (*setpgbwgcfgtx)(struct net_device *, int, u8);
+	void (*setpgtccfgrx)(struct net_device *, int, u8, u8, u8, u8);
+	void (*setpgbwgcfgrx)(struct net_device *, int, u8);
+	void (*getpgtccfgtx)(struct net_device *, int, u8 *, u8 *, u8 *, u8 *);
+	void (*getpgbwgcfgtx)(struct net_device *, int, u8 *);
+	void (*getpgtccfgrx)(struct net_device *, int, u8 *, u8 *, u8 *, u8 *);
+	void (*getpgbwgcfgrx)(struct net_device *, int, u8 *);
+	void (*setpfccfg)(struct net_device *, int, u8);
+	void (*getpfccfg)(struct net_device *, int, u8 *);
+	u8   (*setall)(struct net_device *);
+	u8   (*getcap)(struct net_device *, int, u8 *);
+	int  (*getnumtcs)(struct net_device *, int, u8 *);
+	int  (*setnumtcs)(struct net_device *, int, u8);
+	u8   (*getpfcstate)(struct net_device *);
+	void (*setpfcstate)(struct net_device *, u8);
+	void (*getbcncfg)(struct net_device *, int, u32 *);
+	void (*setbcncfg)(struct net_device *, int, u32);
+	void (*getbcnrp)(struct net_device *, int, u8 *);
+	void (*setbcnrp)(struct net_device *, int, u8);
+	int  (*setapp)(struct net_device *, u8, u16, u8);
+	int  (*getapp)(struct net_device *, u8, u16);
+	u8   (*getfeatcfg)(struct net_device *, int, u8 *);
+	u8   (*setfeatcfg)(struct net_device *, int, u8);
+
+	/* DCBX configuration */
+	u8   (*getdcbx)(struct net_device *);
+	u8   (*setdcbx)(struct net_device *, u8);
+
+	/* peer apps */
+	int (*peer_getappinfo)(struct net_device *, struct dcb_peer_app_info *,
+			       u16 *);
+	int (*peer_getapptable)(struct net_device *, struct dcb_app *);
+
+	/* CEE peer */
+	int (*cee_peer_getpg) (struct net_device *, struct cee_pg *);
+	int (*cee_peer_getpfc) (struct net_device *, struct cee_pfc *);
+
+	/* buffer settings */
+	int (*dcbnl_getbuffer)(struct net_device *, struct dcbnl_buffer *);
+	int (*dcbnl_setbuffer)(struct net_device *, struct dcbnl_buffer *);
+
+	/* apptrust */
+	int (*dcbnl_setapptrust)(struct net_device *, u8 *, int);
+	int (*dcbnl_getapptrust)(struct net_device *, u8 *, int *);
+
+	/* rewrite */
+	int (*dcbnl_setrewr)(struct net_device *dev, struct dcb_app *app);
+	int (*dcbnl_delrewr)(struct net_device *dev, struct dcb_app *app);
+};
+
+#endif /* __NET_DCBNL_H__ */