Merge tag 'net-next-6.3' of git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-nextgrafted

Pull networking updates from Jakub Kicinski:
 "Core:

   - Add dedicated kmem_cache for typical/small skb->head, avoid having
     to access struct page at kfree time, and improve memory use.

   - Introduce sysctl to set default RPS configuration for new netdevs.

   - Define Netlink protocol specification format which can be used to
     describe messages used by each family and auto-generate parsers.
     Add tools for generating kernel data structures and uAPI headers.

   - Expose all net/core sysctls inside netns.

   - Remove 4s sleep in netpoll if carrier is instantly detected on
     boot.

   - Add configurable limit of MDB entries per port, and port-vlan.

   - Continue populating drop reasons throughout the stack.

   - Retire a handful of legacy Qdiscs and classifiers.

  Protocols:

   - Support IPv4 big TCP (TSO frames larger than 64kB).

   - Add IP_LOCAL_PORT_RANGE socket option, to control local port range
     on socket by socket basis.

   - Track and report in procfs number of MPTCP sockets used.

   - Support mixing IPv4 and IPv6 flows in the in-kernel MPTCP path
     manager.

   - IPv6: don't check net.ipv6.route.max_size and rely on garbage
     collection to free memory (similarly to IPv4).

   - Support Penultimate Segment Pop (PSP) flavor in SRv6 (RFC8986).

   - ICMP: add per-rate limit counters.

   - Add support for user scanning requests in ieee802154.

   - Remove static WEP support.

   - Support minimal Wi-Fi 7 Extremely High Throughput (EHT) rate
     reporting.

   - WiFi 7 EHT channel puncturing support (client & AP).

  BPF:

   - Add a rbtree data structure following the "next-gen data structure"
     precedent set by recently added linked list, that is, by using
     kfunc + kptr instead of adding a new BPF map type.

   - Expose XDP hints via kfuncs with initial support for RX hash and
     timestamp metadata.

   - Add BPF_F_NO_TUNNEL_KEY extension to bpf_skb_set_tunnel_key to
     better support decap on GRE tunnel devices not operating in collect
     metadata.

   - Improve x86 JIT's codegen for PROBE_MEM runtime error checks.

   - Remove the need for trace_printk_lock for bpf_trace_printk and
     bpf_trace_vprintk helpers.

   - Extend libbpf's bpf_tracing.h support for tracing arguments of
     kprobes/uprobes and syscall as a special case.

   - Significantly reduce the search time for module symbols by
     livepatch and BPF.

   - Enable cpumasks to be used as kptrs, which is useful for tracing
     programs tracking which tasks end up running on which CPUs in
     different time intervals.

   - Add support for BPF trampoline on s390x and riscv64.

   - Add capability to export the XDP features supported by the NIC.

   - Add __bpf_kfunc tag for marking kernel functions as kfuncs.

   - Add cgroup.memory=nobpf kernel parameter option to disable BPF
     memory accounting for container environments.

  Netfilter:

   - Remove the CLUSTERIP target. It has been marked as obsolete for
     years, and we still have WARN splats wrt races of the out-of-band
     /proc interface installed by this target.

   - Add 'destroy' commands to nf_tables. They are identical to the
     existing 'delete' commands, but do not return an error if the
     referenced object (set, chain, rule...) did not exist.

  Driver API:

   - Improve cpumask_local_spread() locality to help NICs set the right
     IRQ affinity on AMD platforms.

   - Separate C22 and C45 MDIO bus transactions more clearly.

   - Introduce new DCB table to control DSCP rewrite on egress.

   - Support configuration of Physical Layer Collision Avoidance (PLCA)
     Reconciliation Sublayer (RS) (802.3cg-2019). Modern version of
     shared medium Ethernet.

   - Support for MAC Merge layer (IEEE 802.3-2018 clause 99). Allowing
     preemption of low priority frames by high priority frames.

   - Add support for controlling MACSec offload using netlink SET.

   - Rework devlink instance refcounts to allow registration and
     de-registration under the instance lock. Split the code into
     multiple files, drop some of the unnecessarily granular locks and
     factor out common parts of netlink operation handling.

   - Add TX frame aggregation parameters (for USB drivers).

   - Add a new attr TCA_EXT_WARN_MSG to report TC (offload) warning
     messages with notifications for debug.

   - Allow offloading of UDP NEW connections via act_ct.

   - Add support for per action HW stats in TC.

   - Support hardware miss to TC action (continue processing in SW from
     a specific point in the action chain).

   - Warn if old Wireless Extension user space interface is used with
     modern cfg80211/mac80211 drivers. Do not support Wireless
     Extensions for Wi-Fi 7 devices at all. Everyone should switch to
     using nl80211 interface instead.

   - Improve the CAN bit timing configuration. Use extack to return
     error messages directly to user space, update the SJW handling,
     including the definition of a new default value that will benefit
     CAN-FD controllers, by increasing their oscillator tolerance.

  New hardware / drivers:

   - Ethernet:
      - nVidia BlueField-3 support (control traffic driver)
      - Ethernet support for imx93 SoCs
      - Motorcomm yt8531 gigabit Ethernet PHY
      - onsemi NCN26000 10BASE-T1S PHY (with support for PLCA)
      - Microchip LAN8841 PHY (incl. cable diagnostics and PTP)
      - Amlogic gxl MDIO mux

   - WiFi:
      - RealTek RTL8188EU (rtl8xxxu)
      - Qualcomm Wi-Fi 7 devices (ath12k)

   - CAN:
      - Renesas R-Car V4H

  Drivers:

   - Bluetooth:
      - Set Per Platform Antenna Gain (PPAG) for Intel controllers.

   - Ethernet NICs:
      - Intel (1G, igc):
         - support TSN / Qbv / packet scheduling features of i226 model
      - Intel (100G, ice):
         - use GNSS subsystem instead of TTY
         - multi-buffer XDP support
         - extend support for GPIO pins to E823 devices
      - nVidia/Mellanox:
         - update the shared buffer configuration on PFC commands
         - implement PTP adjphase function for HW offset control
         - TC support for Geneve and GRE with VF tunnel offload
         - more efficient crypto key management method
         - multi-port eswitch support
      - Netronome/Corigine:
         - add DCB IEEE support
         - support IPsec offloading for NFP3800
      - Freescale/NXP (enetc):
         - support XDP_REDIRECT for XDP non-linear buffers
         - improve reconfig, avoid link flap and waiting for idle
         - support MAC Merge layer
      - Other NICs:
         - sfc/ef100: add basic devlink support for ef100
         - ionic: rx_push mode operation (writing descriptors via MMIO)
         - bnxt: use the auxiliary bus abstraction for RDMA
         - r8169: disable ASPM and reset bus in case of tx timeout
         - cpsw: support QSGMII mode for J721e CPSW9G
         - cpts: support pulse-per-second output
         - ngbe: add an mdio bus driver
         - usbnet: optimize usbnet_bh() by avoiding unnecessary queuing
         - r8152: handle devices with FW with NCM support
         - amd-xgbe: support 10Mbps, 2.5GbE speeds and rx-adaptation
         - virtio-net: support multi buffer XDP
         - virtio/vsock: replace virtio_vsock_pkt with sk_buff
         - tsnep: XDP support

   - Ethernet high-speed switches:
      - nVidia/Mellanox (mlxsw):
         - add support for latency TLV (in FW control messages)
      - Microchip (sparx5):
         - separate explicit and implicit traffic forwarding rules, make
           the implicit rules always active
         - add support for egress DSCP rewrite
         - IS0 VCAP support (Ingress Classification)
         - IS2 VCAP filters (protos, L3 addrs, L4 ports, flags, ToS
           etc.)
         - ES2 VCAP support (Egress Access Control)
         - support for Per-Stream Filtering and Policing (802.1Q,
           8.6.5.1)

   - Ethernet embedded switches:
      - Marvell (mv88e6xxx):
         - add MAB (port auth) offload support
         - enable PTP receive for mv88e6390
      - NXP (ocelot):
         - support MAC Merge layer
         - support for the the vsc7512 internal copper phys
      - Microchip:
         - lan9303: convert to PHYLINK
         - lan966x: support TC flower filter statistics
         - lan937x: PTP support for KSZ9563/KSZ8563 and LAN937x
         - lan937x: support Credit Based Shaper configuration
         - ksz9477: support Energy Efficient Ethernet
      - other:
         - qca8k: convert to regmap read/write API, use bulk operations
         - rswitch: Improve TX timestamp accuracy

   - Intel WiFi (iwlwifi):
      - EHT (Wi-Fi 7) rate reporting
      - STEP equalizer support: transfer some STEP (connection to radio
        on platforms with integrated wifi) related parameters from the
        BIOS to the firmware.

   - Qualcomm 802.11ax WiFi (ath11k):
      - IPQ5018 support
      - Fine Timing Measurement (FTM) responder role support
      - channel 177 support

   - MediaTek WiFi (mt76):
      - per-PHY LED support
      - mt7996: EHT (Wi-Fi 7) support
      - Wireless Ethernet Dispatch (WED) reset support
      - switch to using page pool allocator

   - RealTek WiFi (rtw89):
      - support new version of Bluetooth co-existance

   - Mobile:
      - rmnet: support TX aggregation"

* tag 'net-next-6.3' of git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-next: (1872 commits)
  page_pool: add a comment explaining the fragment counter usage
  net: ethtool: fix __ethtool_dev_mm_supported() implementation
  ethtool: pse-pd: Fix double word in comments
  xsk: add linux/vmalloc.h to xsk.c
  sefltests: netdevsim: wait for devlink instance after netns removal
  selftest: fib_tests: Always cleanup before exit
  net/mlx5e: Align IPsec ASO result memory to be as required by hardware
  net/mlx5e: TC, Set CT miss to the specific ct action instance
  net/mlx5e: Rename CHAIN_TO_REG to MAPPED_OBJ_TO_REG
  net/mlx5: Refactor tc miss handling to a single function
  net/mlx5: Kconfig: Make tc offload depend on tc skb extension
  net/sched: flower: Support hardware miss to tc action
  net/sched: flower: Move filter handle initialization earlier
  net/sched: cls_api: Support hardware miss to tc action
  net/sched: Rename user cookie and act cookie
  sfc: fix builds without CONFIG_RTC_LIB
  sfc: clean up some inconsistent indentings
  net/mlx4_en: Introduce flexible array to silence overflow warning
  net: lan966x: Fix possible deadlock inside PTP
  net/ulp: Remove redundant ->clone() test in inet_clone_ulp().
  ...

1 files changed, 479 insertions, 0 deletions

diff --git a/arch/arm/mm/dump.c b/arch/arm/mm/dump.c
new file mode 100644
index 000000000..059eb4cdc
--- /dev/null
+++ b/arch/arm/mm/dump.c
@@ -0,0 +1,479 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Debug helper to dump the current kernel pagetables of the system
+ * so that we can see what the various memory ranges are set to.
+ *
+ * Derived from x86 implementation:
+ * (C) Copyright 2008 Intel Corporation
+ *
+ * Author: Arjan van de Ven <arjan@linux.intel.com>
+ */
+#include <linux/debugfs.h>
+#include <linux/fs.h>
+#include <linux/mm.h>
+#include <linux/seq_file.h>
+
+#include <asm/domain.h>
+#include <asm/fixmap.h>
+#include <asm/memory.h>
+#include <asm/ptdump.h>
+
+static struct addr_marker address_markers[] = {
+#ifdef CONFIG_KASAN
+	{ KASAN_SHADOW_START,	"Kasan shadow start"},
+	{ KASAN_SHADOW_END,	"Kasan shadow end"},
+#endif
+	{ MODULES_VADDR,	"Modules" },
+	{ PAGE_OFFSET,		"Kernel Mapping" },
+	{ 0,			"vmalloc() Area" },
+	{ FDT_FIXED_BASE,	"FDT Area" },
+	{ FIXADDR_START,	"Fixmap Area" },
+	{ VECTORS_BASE,	"Vectors" },
+	{ VECTORS_BASE + PAGE_SIZE * 2, "Vectors End" },
+	{ -1,			NULL },
+};
+
+#define pt_dump_seq_printf(m, fmt, args...) \
+({                      \
+	if (m)					\
+		seq_printf(m, fmt, ##args);	\
+})
+
+#define pt_dump_seq_puts(m, fmt)    \
+({						\
+	if (m)					\
+		seq_printf(m, fmt);	\
+})
+
+struct pg_state {
+	struct seq_file *seq;
+	const struct addr_marker *marker;
+	unsigned long start_address;
+	unsigned level;
+	u64 current_prot;
+	bool check_wx;
+	unsigned long wx_pages;
+	const char *current_domain;
+};
+
+struct prot_bits {
+	u64		mask;
+	u64		val;
+	const char	*set;
+	const char	*clear;
+	bool		ro_bit;
+	bool		nx_bit;
+};
+
+static const struct prot_bits pte_bits[] = {
+	{
+		.mask	= L_PTE_USER,
+		.val	= L_PTE_USER,
+		.set	= "USR",
+		.clear	= "   ",
+	}, {
+		.mask	= L_PTE_RDONLY,
+		.val	= L_PTE_RDONLY,
+		.set	= "ro",
+		.clear	= "RW",
+		.ro_bit	= true,
+	}, {
+		.mask	= L_PTE_XN,
+		.val	= L_PTE_XN,
+		.set	= "NX",
+		.clear	= "x ",
+		.nx_bit	= true,
+	}, {
+		.mask	= L_PTE_SHARED,
+		.val	= L_PTE_SHARED,
+		.set	= "SHD",
+		.clear	= "   ",
+	}, {
+		.mask	= L_PTE_MT_MASK,
+		.val	= L_PTE_MT_UNCACHED,
+		.set	= "SO/UNCACHED",
+	}, {
+		.mask	= L_PTE_MT_MASK,
+		.val	= L_PTE_MT_BUFFERABLE,
+		.set	= "MEM/BUFFERABLE/WC",
+	}, {
+		.mask	= L_PTE_MT_MASK,
+		.val	= L_PTE_MT_WRITETHROUGH,
+		.set	= "MEM/CACHED/WT",
+	}, {
+		.mask	= L_PTE_MT_MASK,
+		.val	= L_PTE_MT_WRITEBACK,
+		.set	= "MEM/CACHED/WBRA",
+#ifndef CONFIG_ARM_LPAE
+	}, {
+		.mask	= L_PTE_MT_MASK,
+		.val	= L_PTE_MT_MINICACHE,
+		.set	= "MEM/MINICACHE",
+#endif
+	}, {
+		.mask	= L_PTE_MT_MASK,
+		.val	= L_PTE_MT_WRITEALLOC,
+		.set	= "MEM/CACHED/WBWA",
+	}, {
+		.mask	= L_PTE_MT_MASK,
+		.val	= L_PTE_MT_DEV_SHARED,
+		.set	= "DEV/SHARED",
+#ifndef CONFIG_ARM_LPAE
+	}, {
+		.mask	= L_PTE_MT_MASK,
+		.val	= L_PTE_MT_DEV_NONSHARED,
+		.set	= "DEV/NONSHARED",
+#endif
+	}, {
+		.mask	= L_PTE_MT_MASK,
+		.val	= L_PTE_MT_DEV_WC,
+		.set	= "DEV/WC",
+	}, {
+		.mask	= L_PTE_MT_MASK,
+		.val	= L_PTE_MT_DEV_CACHED,
+		.set	= "DEV/CACHED",
+	},
+};
+
+static const struct prot_bits section_bits[] = {
+#ifdef CONFIG_ARM_LPAE
+	{
+		.mask	= PMD_SECT_USER,
+		.val	= PMD_SECT_USER,
+		.set	= "USR",
+	}, {
+		.mask	= L_PMD_SECT_RDONLY | PMD_SECT_AP2,
+		.val	= L_PMD_SECT_RDONLY | PMD_SECT_AP2,
+		.set	= "ro",
+		.clear	= "RW",
+		.ro_bit	= true,
+#elif __LINUX_ARM_ARCH__ >= 6
+	{
+		.mask	= PMD_SECT_APX | PMD_SECT_AP_READ | PMD_SECT_AP_WRITE,
+		.val	= PMD_SECT_APX | PMD_SECT_AP_WRITE,
+		.set	= "    ro",
+		.ro_bit	= true,
+	}, {
+		.mask	= PMD_SECT_APX | PMD_SECT_AP_READ | PMD_SECT_AP_WRITE,
+		.val	= PMD_SECT_AP_WRITE,
+		.set	= "    RW",
+	}, {
+		.mask	= PMD_SECT_APX | PMD_SECT_AP_READ | PMD_SECT_AP_WRITE,
+		.val	= PMD_SECT_AP_READ,
+		.set	= "USR ro",
+	}, {
+		.mask	= PMD_SECT_APX | PMD_SECT_AP_READ | PMD_SECT_AP_WRITE,
+		.val	= PMD_SECT_AP_READ | PMD_SECT_AP_WRITE,
+		.set	= "USR RW",
+#else /* ARMv4/ARMv5  */
+	/* These are approximate */
+	{
+		.mask   = PMD_SECT_AP_READ | PMD_SECT_AP_WRITE,
+		.val    = 0,
+		.set    = "    ro",
+		.ro_bit	= true,
+	}, {
+		.mask   = PMD_SECT_AP_READ | PMD_SECT_AP_WRITE,
+		.val    = PMD_SECT_AP_WRITE,
+		.set    = "    RW",
+	}, {
+		.mask   = PMD_SECT_AP_READ | PMD_SECT_AP_WRITE,
+		.val    = PMD_SECT_AP_READ,
+		.set    = "USR ro",
+	}, {
+		.mask   = PMD_SECT_AP_READ | PMD_SECT_AP_WRITE,
+		.val    = PMD_SECT_AP_READ | PMD_SECT_AP_WRITE,
+		.set    = "USR RW",
+#endif
+	}, {
+		.mask	= PMD_SECT_XN,
+		.val	= PMD_SECT_XN,
+		.set	= "NX",
+		.clear	= "x ",
+		.nx_bit	= true,
+	}, {
+		.mask	= PMD_SECT_S,
+		.val	= PMD_SECT_S,
+		.set	= "SHD",
+		.clear	= "   ",
+	},
+};
+
+struct pg_level {
+	const char *name;
+	const struct prot_bits *bits;
+	size_t num;
+	u64 mask;
+	const struct prot_bits *ro_bit;
+	const struct prot_bits *nx_bit;
+};
+
+static struct pg_level pg_level[] = {
+	{
+	}, { /* pgd */
+	}, { /* p4d */
+	}, { /* pud */
+	}, { /* pmd */
+		.name	= (CONFIG_PGTABLE_LEVELS > 2) ? "PMD" : "PGD",
+		.bits	= section_bits,
+		.num	= ARRAY_SIZE(section_bits),
+	}, { /* pte */
+		.name	= "PTE",
+		.bits	= pte_bits,
+		.num	= ARRAY_SIZE(pte_bits),
+	},
+};
+
+static void dump_prot(struct pg_state *st, const struct prot_bits *bits, size_t num)
+{
+	unsigned i;
+
+	for (i = 0; i < num; i++, bits++) {
+		const char *s;
+
+		if ((st->current_prot & bits->mask) == bits->val)
+			s = bits->set;
+		else
+			s = bits->clear;
+
+		if (s)
+			pt_dump_seq_printf(st->seq, " %s", s);
+	}
+}
+
+static void note_prot_wx(struct pg_state *st, unsigned long addr)
+{
+	if (!st->check_wx)
+		return;
+	if ((st->current_prot & pg_level[st->level].ro_bit->mask) ==
+				pg_level[st->level].ro_bit->val)
+		return;
+	if ((st->current_prot & pg_level[st->level].nx_bit->mask) ==
+				pg_level[st->level].nx_bit->val)
+		return;
+
+	WARN_ONCE(1, "arm/mm: Found insecure W+X mapping at address %pS\n",
+			(void *)st->start_address);
+
+	st->wx_pages += (addr - st->start_address) / PAGE_SIZE;
+}
+
+static void note_page(struct pg_state *st, unsigned long addr,
+		      unsigned int level, u64 val, const char *domain)
+{
+	static const char units[] = "KMGTPE";
+	u64 prot = val & pg_level[level].mask;
+
+	if (!st->level) {
+		st->level = level;
+		st->current_prot = prot;
+		st->current_domain = domain;
+		pt_dump_seq_printf(st->seq, "---[ %s ]---\n", st->marker->name);
+	} else if (prot != st->current_prot || level != st->level ||
+		   domain != st->current_domain ||
+		   addr >= st->marker[1].start_address) {
+		const char *unit = units;
+		unsigned long delta;
+
+		if (st->current_prot) {
+			note_prot_wx(st, addr);
+			pt_dump_seq_printf(st->seq, "0x%08lx-0x%08lx   ",
+				   st->start_address, addr);
+
+			delta = (addr - st->start_address) >> 10;
+			while (!(delta & 1023) && unit[1]) {
+				delta >>= 10;
+				unit++;
+			}
+			pt_dump_seq_printf(st->seq, "%9lu%c %s", delta, *unit,
+					   pg_level[st->level].name);
+			if (st->current_domain)
+				pt_dump_seq_printf(st->seq, " %s",
+							st->current_domain);
+			if (pg_level[st->level].bits)
+				dump_prot(st, pg_level[st->level].bits, pg_level[st->level].num);
+			pt_dump_seq_printf(st->seq, "\n");
+		}
+
+		if (addr >= st->marker[1].start_address) {
+			st->marker++;
+			pt_dump_seq_printf(st->seq, "---[ %s ]---\n",
+							st->marker->name);
+		}
+		st->start_address = addr;
+		st->current_prot = prot;
+		st->current_domain = domain;
+		st->level = level;
+	}
+}
+
+static void walk_pte(struct pg_state *st, pmd_t *pmd, unsigned long start,
+		     const char *domain)
+{
+	pte_t *pte = pte_offset_kernel(pmd, 0);
+	unsigned long addr;
+	unsigned i;
+
+	for (i = 0; i < PTRS_PER_PTE; i++, pte++) {
+		addr = start + i * PAGE_SIZE;
+		note_page(st, addr, 5, pte_val(*pte), domain);
+	}
+}
+
+static const char *get_domain_name(pmd_t *pmd)
+{
+#ifndef CONFIG_ARM_LPAE
+	switch (pmd_val(*pmd) & PMD_DOMAIN_MASK) {
+	case PMD_DOMAIN(DOMAIN_KERNEL):
+		return "KERNEL ";
+	case PMD_DOMAIN(DOMAIN_USER):
+		return "USER   ";
+	case PMD_DOMAIN(DOMAIN_IO):
+		return "IO     ";
+	case PMD_DOMAIN(DOMAIN_VECTORS):
+		return "VECTORS";
+	default:
+		return "unknown";
+	}
+#endif
+	return NULL;
+}
+
+static void walk_pmd(struct pg_state *st, pud_t *pud, unsigned long start)
+{
+	pmd_t *pmd = pmd_offset(pud, 0);
+	unsigned long addr;
+	unsigned i;
+	const char *domain;
+
+	for (i = 0; i < PTRS_PER_PMD; i++, pmd++) {
+		addr = start + i * PMD_SIZE;
+		domain = get_domain_name(pmd);
+		if (pmd_none(*pmd) || pmd_large(*pmd) || !pmd_present(*pmd))
+			note_page(st, addr, 4, pmd_val(*pmd), domain);
+		else
+			walk_pte(st, pmd, addr, domain);
+
+		if (SECTION_SIZE < PMD_SIZE && pmd_large(pmd[1])) {
+			addr += SECTION_SIZE;
+			pmd++;
+			domain = get_domain_name(pmd);
+			note_page(st, addr, 4, pmd_val(*pmd), domain);
+		}
+	}
+}
+
+static void walk_pud(struct pg_state *st, p4d_t *p4d, unsigned long start)
+{
+	pud_t *pud = pud_offset(p4d, 0);
+	unsigned long addr;
+	unsigned i;
+
+	for (i = 0; i < PTRS_PER_PUD; i++, pud++) {
+		addr = start + i * PUD_SIZE;
+		if (!pud_none(*pud)) {
+			walk_pmd(st, pud, addr);
+		} else {
+			note_page(st, addr, 3, pud_val(*pud), NULL);
+		}
+	}
+}
+
+static void walk_p4d(struct pg_state *st, pgd_t *pgd, unsigned long start)
+{
+	p4d_t *p4d = p4d_offset(pgd, 0);
+	unsigned long addr;
+	unsigned i;
+
+	for (i = 0; i < PTRS_PER_P4D; i++, p4d++) {
+		addr = start + i * P4D_SIZE;
+		if (!p4d_none(*p4d)) {
+			walk_pud(st, p4d, addr);
+		} else {
+			note_page(st, addr, 2, p4d_val(*p4d), NULL);
+		}
+	}
+}
+
+static void walk_pgd(struct pg_state *st, struct mm_struct *mm,
+			unsigned long start)
+{
+	pgd_t *pgd = pgd_offset(mm, 0UL);
+	unsigned i;
+	unsigned long addr;
+
+	for (i = 0; i < PTRS_PER_PGD; i++, pgd++) {
+		addr = start + i * PGDIR_SIZE;
+		if (!pgd_none(*pgd)) {
+			walk_p4d(st, pgd, addr);
+		} else {
+			note_page(st, addr, 1, pgd_val(*pgd), NULL);
+		}
+	}
+}
+
+void ptdump_walk_pgd(struct seq_file *m, struct ptdump_info *info)
+{
+	struct pg_state st = {
+		.seq = m,
+		.marker = info->markers,
+		.check_wx = false,
+	};
+
+	walk_pgd(&st, info->mm, info->base_addr);
+	note_page(&st, 0, 0, 0, NULL);
+}
+
+static void __init ptdump_initialize(void)
+{
+	unsigned i, j;
+
+	for (i = 0; i < ARRAY_SIZE(pg_level); i++)
+		if (pg_level[i].bits)
+			for (j = 0; j < pg_level[i].num; j++) {
+				pg_level[i].mask |= pg_level[i].bits[j].mask;
+				if (pg_level[i].bits[j].ro_bit)
+					pg_level[i].ro_bit = &pg_level[i].bits[j];
+				if (pg_level[i].bits[j].nx_bit)
+					pg_level[i].nx_bit = &pg_level[i].bits[j];
+			}
+#ifdef CONFIG_KASAN
+	address_markers[4].start_address = VMALLOC_START;
+#else
+	address_markers[2].start_address = VMALLOC_START;
+#endif
+}
+
+static struct ptdump_info kernel_ptdump_info = {
+	.mm = &init_mm,
+	.markers = address_markers,
+	.base_addr = 0,
+};
+
+void ptdump_check_wx(void)
+{
+	struct pg_state st = {
+		.seq = NULL,
+		.marker = (struct addr_marker[]) {
+			{ 0, NULL},
+			{ -1, NULL},
+		},
+		.check_wx = true,
+	};
+
+	walk_pgd(&st, &init_mm, 0);
+	note_page(&st, 0, 0, 0, NULL);
+	if (st.wx_pages)
+		pr_warn("Checked W+X mappings: FAILED, %lu W+X pages found\n",
+			st.wx_pages);
+	else
+		pr_info("Checked W+X mappings: passed, no W+X pages found\n");
+}
+
+static int __init ptdump_init(void)
+{
+	ptdump_initialize();
+	ptdump_debugfs_register(&kernel_ptdump_info, "kernel_page_tables");
+	return 0;
+}
+__initcall(ptdump_init);