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, 162 insertions, 0 deletions

diff --git a/include/net/lapb.h b/include/net/lapb.h
new file mode 100644
index 000000000..6c0742064
--- /dev/null
+++ b/include/net/lapb.h
@@ -0,0 +1,162 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef _LAPB_H
+#define _LAPB_H 
+#include <linux/lapb.h>
+#include <linux/refcount.h>
+
+#define	LAPB_HEADER_LEN MAX_HEADER		/* LAPB over Ethernet + a bit more */
+
+#define	LAPB_ACK_PENDING_CONDITION	0x01
+#define	LAPB_REJECT_CONDITION		0x02
+#define	LAPB_PEER_RX_BUSY_CONDITION	0x04
+
+/* Control field templates */
+#define	LAPB_I		0x00	/* Information frames */
+#define	LAPB_S		0x01	/* Supervisory frames */
+#define	LAPB_U		0x03	/* Unnumbered frames */
+
+#define	LAPB_RR		0x01	/* Receiver ready */
+#define	LAPB_RNR	0x05	/* Receiver not ready */
+#define	LAPB_REJ	0x09	/* Reject */
+
+#define	LAPB_SABM	0x2F	/* Set Asynchronous Balanced Mode */
+#define	LAPB_SABME	0x6F	/* Set Asynchronous Balanced Mode Extended */
+#define	LAPB_DISC	0x43	/* Disconnect */
+#define	LAPB_DM		0x0F	/* Disconnected mode */
+#define	LAPB_UA		0x63	/* Unnumbered acknowledge */
+#define	LAPB_FRMR	0x87	/* Frame reject */
+
+#define LAPB_ILLEGAL	0x100	/* Impossible to be a real frame type */
+
+#define	LAPB_SPF	0x10	/* Poll/final bit for standard LAPB */
+#define	LAPB_EPF	0x01	/* Poll/final bit for extended LAPB */
+
+#define	LAPB_FRMR_W	0x01	/* Control field invalid	*/
+#define	LAPB_FRMR_X	0x02	/* I field invalid		*/
+#define	LAPB_FRMR_Y	0x04	/* I field too long		*/
+#define	LAPB_FRMR_Z	0x08	/* Invalid N(R)			*/
+
+#define	LAPB_POLLOFF	0
+#define	LAPB_POLLON	1
+
+/* LAPB C-bit */
+#define LAPB_COMMAND	1
+#define LAPB_RESPONSE	2
+
+#define	LAPB_ADDR_A	0x03
+#define	LAPB_ADDR_B	0x01
+#define	LAPB_ADDR_C	0x0F
+#define	LAPB_ADDR_D	0x07
+
+/* Define Link State constants. */
+enum {
+	LAPB_STATE_0,	/* Disconnected State		*/
+	LAPB_STATE_1,	/* Awaiting Connection State	*/
+	LAPB_STATE_2,	/* Awaiting Disconnection State	*/
+	LAPB_STATE_3,	/* Data Transfer State		*/
+	LAPB_STATE_4	/* Frame Reject State		*/
+};
+
+#define	LAPB_DEFAULT_MODE		(LAPB_STANDARD | LAPB_SLP | LAPB_DTE)
+#define	LAPB_DEFAULT_WINDOW		7		/* Window=7 */
+#define	LAPB_DEFAULT_T1			(5 * HZ)	/* T1=5s    */
+#define	LAPB_DEFAULT_T2			(1 * HZ)	/* T2=1s    */
+#define	LAPB_DEFAULT_N2			20		/* N2=20    */
+
+#define	LAPB_SMODULUS	8
+#define	LAPB_EMODULUS	128
+
+/*
+ *	Information about the current frame.
+ */
+struct lapb_frame {
+	unsigned short		type;		/* Parsed type		*/
+	unsigned short		nr, ns;		/* N(R), N(S)		*/
+	unsigned char		cr;		/* Command/Response	*/
+	unsigned char		pf;		/* Poll/Final		*/
+	unsigned char		control[2];	/* Original control data*/
+};
+
+/*
+ *	The per LAPB connection control structure.
+ */
+struct lapb_cb {
+	struct list_head	node;
+	struct net_device	*dev;
+
+	/* Link status fields */
+	unsigned int		mode;
+	unsigned char		state;
+	unsigned short		vs, vr, va;
+	unsigned char		condition;
+	unsigned short		n2, n2count;
+	unsigned short		t1, t2;
+	struct timer_list	t1timer, t2timer;
+	bool			t1timer_running, t2timer_running;
+
+	/* Internal control information */
+	struct sk_buff_head	write_queue;
+	struct sk_buff_head	ack_queue;
+	unsigned char		window;
+	const struct lapb_register_struct *callbacks;
+
+	/* FRMR control information */
+	struct lapb_frame	frmr_data;
+	unsigned char		frmr_type;
+
+	spinlock_t		lock;
+	refcount_t		refcnt;
+};
+
+/* lapb_iface.c */
+void lapb_connect_confirmation(struct lapb_cb *lapb, int);
+void lapb_connect_indication(struct lapb_cb *lapb, int);
+void lapb_disconnect_confirmation(struct lapb_cb *lapb, int);
+void lapb_disconnect_indication(struct lapb_cb *lapb, int);
+int lapb_data_indication(struct lapb_cb *lapb, struct sk_buff *);
+int lapb_data_transmit(struct lapb_cb *lapb, struct sk_buff *);
+
+/* lapb_in.c */
+void lapb_data_input(struct lapb_cb *lapb, struct sk_buff *);
+
+/* lapb_out.c */
+void lapb_kick(struct lapb_cb *lapb);
+void lapb_transmit_buffer(struct lapb_cb *lapb, struct sk_buff *, int);
+void lapb_establish_data_link(struct lapb_cb *lapb);
+void lapb_enquiry_response(struct lapb_cb *lapb);
+void lapb_timeout_response(struct lapb_cb *lapb);
+void lapb_check_iframes_acked(struct lapb_cb *lapb, unsigned short);
+void lapb_check_need_response(struct lapb_cb *lapb, int, int);
+
+/* lapb_subr.c */
+void lapb_clear_queues(struct lapb_cb *lapb);
+void lapb_frames_acked(struct lapb_cb *lapb, unsigned short);
+void lapb_requeue_frames(struct lapb_cb *lapb);
+int lapb_validate_nr(struct lapb_cb *lapb, unsigned short);
+int lapb_decode(struct lapb_cb *lapb, struct sk_buff *, struct lapb_frame *);
+void lapb_send_control(struct lapb_cb *lapb, int, int, int);
+void lapb_transmit_frmr(struct lapb_cb *lapb);
+
+/* lapb_timer.c */
+void lapb_start_t1timer(struct lapb_cb *lapb);
+void lapb_start_t2timer(struct lapb_cb *lapb);
+void lapb_stop_t1timer(struct lapb_cb *lapb);
+void lapb_stop_t2timer(struct lapb_cb *lapb);
+int lapb_t1timer_running(struct lapb_cb *lapb);
+
+/*
+ * Debug levels.
+ *	0 = Off
+ *	1 = State Changes
+ *	2 = Packets I/O and State Changes
+ *	3 = Hex dumps, Packets I/O and State Changes.
+ */
+#define	LAPB_DEBUG	0
+
+#define lapb_dbg(level, fmt, ...)			\
+do {							\
+	if (level < LAPB_DEBUG)				\
+		pr_debug(fmt, ##__VA_ARGS__);		\
+} while (0)
+
+#endif