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, 598 insertions, 0 deletions

diff --git a/mm/hmm.c b/mm/hmm.c
new file mode 100644
index 000000000..601a99ce3
--- /dev/null
+++ b/mm/hmm.c
@@ -0,0 +1,598 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Copyright 2013 Red Hat Inc.
+ *
+ * Authors: Jérôme Glisse <jglisse@redhat.com>
+ */
+/*
+ * Refer to include/linux/hmm.h for information about heterogeneous memory
+ * management or HMM for short.
+ */
+#include <linux/pagewalk.h>
+#include <linux/hmm.h>
+#include <linux/init.h>
+#include <linux/rmap.h>
+#include <linux/swap.h>
+#include <linux/slab.h>
+#include <linux/sched.h>
+#include <linux/mmzone.h>
+#include <linux/pagemap.h>
+#include <linux/swapops.h>
+#include <linux/hugetlb.h>
+#include <linux/memremap.h>
+#include <linux/sched/mm.h>
+#include <linux/jump_label.h>
+#include <linux/dma-mapping.h>
+#include <linux/mmu_notifier.h>
+#include <linux/memory_hotplug.h>
+
+#include "internal.h"
+
+struct hmm_vma_walk {
+	struct hmm_range	*range;
+	unsigned long		last;
+};
+
+enum {
+	HMM_NEED_FAULT = 1 << 0,
+	HMM_NEED_WRITE_FAULT = 1 << 1,
+	HMM_NEED_ALL_BITS = HMM_NEED_FAULT | HMM_NEED_WRITE_FAULT,
+};
+
+static int hmm_pfns_fill(unsigned long addr, unsigned long end,
+			 struct hmm_range *range, unsigned long cpu_flags)
+{
+	unsigned long i = (addr - range->start) >> PAGE_SHIFT;
+
+	for (; addr < end; addr += PAGE_SIZE, i++)
+		range->hmm_pfns[i] = cpu_flags;
+	return 0;
+}
+
+/*
+ * hmm_vma_fault() - fault in a range lacking valid pmd or pte(s)
+ * @addr: range virtual start address (inclusive)
+ * @end: range virtual end address (exclusive)
+ * @required_fault: HMM_NEED_* flags
+ * @walk: mm_walk structure
+ * Return: -EBUSY after page fault, or page fault error
+ *
+ * This function will be called whenever pmd_none() or pte_none() returns true,
+ * or whenever there is no page directory covering the virtual address range.
+ */
+static int hmm_vma_fault(unsigned long addr, unsigned long end,
+			 unsigned int required_fault, struct mm_walk *walk)
+{
+	struct hmm_vma_walk *hmm_vma_walk = walk->private;
+	struct vm_area_struct *vma = walk->vma;
+	unsigned int fault_flags = FAULT_FLAG_REMOTE;
+
+	WARN_ON_ONCE(!required_fault);
+	hmm_vma_walk->last = addr;
+
+	if (required_fault & HMM_NEED_WRITE_FAULT) {
+		if (!(vma->vm_flags & VM_WRITE))
+			return -EPERM;
+		fault_flags |= FAULT_FLAG_WRITE;
+	}
+
+	for (; addr < end; addr += PAGE_SIZE)
+		if (handle_mm_fault(vma, addr, fault_flags, NULL) &
+		    VM_FAULT_ERROR)
+			return -EFAULT;
+	return -EBUSY;
+}
+
+static unsigned int hmm_pte_need_fault(const struct hmm_vma_walk *hmm_vma_walk,
+				       unsigned long pfn_req_flags,
+				       unsigned long cpu_flags)
+{
+	struct hmm_range *range = hmm_vma_walk->range;
+
+	/*
+	 * So we not only consider the individual per page request we also
+	 * consider the default flags requested for the range. The API can
+	 * be used 2 ways. The first one where the HMM user coalesces
+	 * multiple page faults into one request and sets flags per pfn for
+	 * those faults. The second one where the HMM user wants to pre-
+	 * fault a range with specific flags. For the latter one it is a
+	 * waste to have the user pre-fill the pfn arrays with a default
+	 * flags value.
+	 */
+	pfn_req_flags &= range->pfn_flags_mask;
+	pfn_req_flags |= range->default_flags;
+
+	/* We aren't ask to do anything ... */
+	if (!(pfn_req_flags & HMM_PFN_REQ_FAULT))
+		return 0;
+
+	/* Need to write fault ? */
+	if ((pfn_req_flags & HMM_PFN_REQ_WRITE) &&
+	    !(cpu_flags & HMM_PFN_WRITE))
+		return HMM_NEED_FAULT | HMM_NEED_WRITE_FAULT;
+
+	/* If CPU page table is not valid then we need to fault */
+	if (!(cpu_flags & HMM_PFN_VALID))
+		return HMM_NEED_FAULT;
+	return 0;
+}
+
+static unsigned int
+hmm_range_need_fault(const struct hmm_vma_walk *hmm_vma_walk,
+		     const unsigned long hmm_pfns[], unsigned long npages,
+		     unsigned long cpu_flags)
+{
+	struct hmm_range *range = hmm_vma_walk->range;
+	unsigned int required_fault = 0;
+	unsigned long i;
+
+	/*
+	 * If the default flags do not request to fault pages, and the mask does
+	 * not allow for individual pages to be faulted, then
+	 * hmm_pte_need_fault() will always return 0.
+	 */
+	if (!((range->default_flags | range->pfn_flags_mask) &
+	      HMM_PFN_REQ_FAULT))
+		return 0;
+
+	for (i = 0; i < npages; ++i) {
+		required_fault |= hmm_pte_need_fault(hmm_vma_walk, hmm_pfns[i],
+						     cpu_flags);
+		if (required_fault == HMM_NEED_ALL_BITS)
+			return required_fault;
+	}
+	return required_fault;
+}
+
+static int hmm_vma_walk_hole(unsigned long addr, unsigned long end,
+			     __always_unused int depth, struct mm_walk *walk)
+{
+	struct hmm_vma_walk *hmm_vma_walk = walk->private;
+	struct hmm_range *range = hmm_vma_walk->range;
+	unsigned int required_fault;
+	unsigned long i, npages;
+	unsigned long *hmm_pfns;
+
+	i = (addr - range->start) >> PAGE_SHIFT;
+	npages = (end - addr) >> PAGE_SHIFT;
+	hmm_pfns = &range->hmm_pfns[i];
+	required_fault =
+		hmm_range_need_fault(hmm_vma_walk, hmm_pfns, npages, 0);
+	if (!walk->vma) {
+		if (required_fault)
+			return -EFAULT;
+		return hmm_pfns_fill(addr, end, range, HMM_PFN_ERROR);
+	}
+	if (required_fault)
+		return hmm_vma_fault(addr, end, required_fault, walk);
+	return hmm_pfns_fill(addr, end, range, 0);
+}
+
+static inline unsigned long hmm_pfn_flags_order(unsigned long order)
+{
+	return order << HMM_PFN_ORDER_SHIFT;
+}
+
+static inline unsigned long pmd_to_hmm_pfn_flags(struct hmm_range *range,
+						 pmd_t pmd)
+{
+	if (pmd_protnone(pmd))
+		return 0;
+	return (pmd_write(pmd) ? (HMM_PFN_VALID | HMM_PFN_WRITE) :
+				 HMM_PFN_VALID) |
+	       hmm_pfn_flags_order(PMD_SHIFT - PAGE_SHIFT);
+}
+
+#ifdef CONFIG_TRANSPARENT_HUGEPAGE
+static int hmm_vma_handle_pmd(struct mm_walk *walk, unsigned long addr,
+			      unsigned long end, unsigned long hmm_pfns[],
+			      pmd_t pmd)
+{
+	struct hmm_vma_walk *hmm_vma_walk = walk->private;
+	struct hmm_range *range = hmm_vma_walk->range;
+	unsigned long pfn, npages, i;
+	unsigned int required_fault;
+	unsigned long cpu_flags;
+
+	npages = (end - addr) >> PAGE_SHIFT;
+	cpu_flags = pmd_to_hmm_pfn_flags(range, pmd);
+	required_fault =
+		hmm_range_need_fault(hmm_vma_walk, hmm_pfns, npages, cpu_flags);
+	if (required_fault)
+		return hmm_vma_fault(addr, end, required_fault, walk);
+
+	pfn = pmd_pfn(pmd) + ((addr & ~PMD_MASK) >> PAGE_SHIFT);
+	for (i = 0; addr < end; addr += PAGE_SIZE, i++, pfn++)
+		hmm_pfns[i] = pfn | cpu_flags;
+	return 0;
+}
+#else /* CONFIG_TRANSPARENT_HUGEPAGE */
+/* stub to allow the code below to compile */
+int hmm_vma_handle_pmd(struct mm_walk *walk, unsigned long addr,
+		unsigned long end, unsigned long hmm_pfns[], pmd_t pmd);
+#endif /* CONFIG_TRANSPARENT_HUGEPAGE */
+
+static inline unsigned long pte_to_hmm_pfn_flags(struct hmm_range *range,
+						 pte_t pte)
+{
+	if (pte_none(pte) || !pte_present(pte) || pte_protnone(pte))
+		return 0;
+	return pte_write(pte) ? (HMM_PFN_VALID | HMM_PFN_WRITE) : HMM_PFN_VALID;
+}
+
+static int hmm_vma_handle_pte(struct mm_walk *walk, unsigned long addr,
+			      unsigned long end, pmd_t *pmdp, pte_t *ptep,
+			      unsigned long *hmm_pfn)
+{
+	struct hmm_vma_walk *hmm_vma_walk = walk->private;
+	struct hmm_range *range = hmm_vma_walk->range;
+	unsigned int required_fault;
+	unsigned long cpu_flags;
+	pte_t pte = *ptep;
+	uint64_t pfn_req_flags = *hmm_pfn;
+
+	if (pte_none_mostly(pte)) {
+		required_fault =
+			hmm_pte_need_fault(hmm_vma_walk, pfn_req_flags, 0);
+		if (required_fault)
+			goto fault;
+		*hmm_pfn = 0;
+		return 0;
+	}
+
+	if (!pte_present(pte)) {
+		swp_entry_t entry = pte_to_swp_entry(pte);
+
+		/*
+		 * Don't fault in device private pages owned by the caller,
+		 * just report the PFN.
+		 */
+		if (is_device_private_entry(entry) &&
+		    pfn_swap_entry_to_page(entry)->pgmap->owner ==
+		    range->dev_private_owner) {
+			cpu_flags = HMM_PFN_VALID;
+			if (is_writable_device_private_entry(entry))
+				cpu_flags |= HMM_PFN_WRITE;
+			*hmm_pfn = swp_offset_pfn(entry) | cpu_flags;
+			return 0;
+		}
+
+		required_fault =
+			hmm_pte_need_fault(hmm_vma_walk, pfn_req_flags, 0);
+		if (!required_fault) {
+			*hmm_pfn = 0;
+			return 0;
+		}
+
+		if (!non_swap_entry(entry))
+			goto fault;
+
+		if (is_device_private_entry(entry))
+			goto fault;
+
+		if (is_device_exclusive_entry(entry))
+			goto fault;
+
+		if (is_migration_entry(entry)) {
+			pte_unmap(ptep);
+			hmm_vma_walk->last = addr;
+			migration_entry_wait(walk->mm, pmdp, addr);
+			return -EBUSY;
+		}
+
+		/* Report error for everything else */
+		pte_unmap(ptep);
+		return -EFAULT;
+	}
+
+	cpu_flags = pte_to_hmm_pfn_flags(range, pte);
+	required_fault =
+		hmm_pte_need_fault(hmm_vma_walk, pfn_req_flags, cpu_flags);
+	if (required_fault)
+		goto fault;
+
+	/*
+	 * Bypass devmap pte such as DAX page when all pfn requested
+	 * flags(pfn_req_flags) are fulfilled.
+	 * Since each architecture defines a struct page for the zero page, just
+	 * fall through and treat it like a normal page.
+	 */
+	if (!vm_normal_page(walk->vma, addr, pte) &&
+	    !pte_devmap(pte) &&
+	    !is_zero_pfn(pte_pfn(pte))) {
+		if (hmm_pte_need_fault(hmm_vma_walk, pfn_req_flags, 0)) {
+			pte_unmap(ptep);
+			return -EFAULT;
+		}
+		*hmm_pfn = HMM_PFN_ERROR;
+		return 0;
+	}
+
+	*hmm_pfn = pte_pfn(pte) | cpu_flags;
+	return 0;
+
+fault:
+	pte_unmap(ptep);
+	/* Fault any virtual address we were asked to fault */
+	return hmm_vma_fault(addr, end, required_fault, walk);
+}
+
+static int hmm_vma_walk_pmd(pmd_t *pmdp,
+			    unsigned long start,
+			    unsigned long end,
+			    struct mm_walk *walk)
+{
+	struct hmm_vma_walk *hmm_vma_walk = walk->private;
+	struct hmm_range *range = hmm_vma_walk->range;
+	unsigned long *hmm_pfns =
+		&range->hmm_pfns[(start - range->start) >> PAGE_SHIFT];
+	unsigned long npages = (end - start) >> PAGE_SHIFT;
+	unsigned long addr = start;
+	pte_t *ptep;
+	pmd_t pmd;
+
+again:
+	pmd = READ_ONCE(*pmdp);
+	if (pmd_none(pmd))
+		return hmm_vma_walk_hole(start, end, -1, walk);
+
+	if (thp_migration_supported() && is_pmd_migration_entry(pmd)) {
+		if (hmm_range_need_fault(hmm_vma_walk, hmm_pfns, npages, 0)) {
+			hmm_vma_walk->last = addr;
+			pmd_migration_entry_wait(walk->mm, pmdp);
+			return -EBUSY;
+		}
+		return hmm_pfns_fill(start, end, range, 0);
+	}
+
+	if (!pmd_present(pmd)) {
+		if (hmm_range_need_fault(hmm_vma_walk, hmm_pfns, npages, 0))
+			return -EFAULT;
+		return hmm_pfns_fill(start, end, range, HMM_PFN_ERROR);
+	}
+
+	if (pmd_devmap(pmd) || pmd_trans_huge(pmd)) {
+		/*
+		 * No need to take pmd_lock here, even if some other thread
+		 * is splitting the huge pmd we will get that event through
+		 * mmu_notifier callback.
+		 *
+		 * So just read pmd value and check again it's a transparent
+		 * huge or device mapping one and compute corresponding pfn
+		 * values.
+		 */
+		pmd = pmdp_get_lockless(pmdp);
+		if (!pmd_devmap(pmd) && !pmd_trans_huge(pmd))
+			goto again;
+
+		return hmm_vma_handle_pmd(walk, addr, end, hmm_pfns, pmd);
+	}
+
+	/*
+	 * We have handled all the valid cases above ie either none, migration,
+	 * huge or transparent huge. At this point either it is a valid pmd
+	 * entry pointing to pte directory or it is a bad pmd that will not
+	 * recover.
+	 */
+	if (pmd_bad(pmd)) {
+		if (hmm_range_need_fault(hmm_vma_walk, hmm_pfns, npages, 0))
+			return -EFAULT;
+		return hmm_pfns_fill(start, end, range, HMM_PFN_ERROR);
+	}
+
+	ptep = pte_offset_map(pmdp, addr);
+	for (; addr < end; addr += PAGE_SIZE, ptep++, hmm_pfns++) {
+		int r;
+
+		r = hmm_vma_handle_pte(walk, addr, end, pmdp, ptep, hmm_pfns);
+		if (r) {
+			/* hmm_vma_handle_pte() did pte_unmap() */
+			return r;
+		}
+	}
+	pte_unmap(ptep - 1);
+	return 0;
+}
+
+#if defined(CONFIG_ARCH_HAS_PTE_DEVMAP) && \
+    defined(CONFIG_HAVE_ARCH_TRANSPARENT_HUGEPAGE_PUD)
+static inline unsigned long pud_to_hmm_pfn_flags(struct hmm_range *range,
+						 pud_t pud)
+{
+	if (!pud_present(pud))
+		return 0;
+	return (pud_write(pud) ? (HMM_PFN_VALID | HMM_PFN_WRITE) :
+				 HMM_PFN_VALID) |
+	       hmm_pfn_flags_order(PUD_SHIFT - PAGE_SHIFT);
+}
+
+static int hmm_vma_walk_pud(pud_t *pudp, unsigned long start, unsigned long end,
+		struct mm_walk *walk)
+{
+	struct hmm_vma_walk *hmm_vma_walk = walk->private;
+	struct hmm_range *range = hmm_vma_walk->range;
+	unsigned long addr = start;
+	pud_t pud;
+	spinlock_t *ptl = pud_trans_huge_lock(pudp, walk->vma);
+
+	if (!ptl)
+		return 0;
+
+	/* Normally we don't want to split the huge page */
+	walk->action = ACTION_CONTINUE;
+
+	pud = READ_ONCE(*pudp);
+	if (pud_none(pud)) {
+		spin_unlock(ptl);
+		return hmm_vma_walk_hole(start, end, -1, walk);
+	}
+
+	if (pud_huge(pud) && pud_devmap(pud)) {
+		unsigned long i, npages, pfn;
+		unsigned int required_fault;
+		unsigned long *hmm_pfns;
+		unsigned long cpu_flags;
+
+		if (!pud_present(pud)) {
+			spin_unlock(ptl);
+			return hmm_vma_walk_hole(start, end, -1, walk);
+		}
+
+		i = (addr - range->start) >> PAGE_SHIFT;
+		npages = (end - addr) >> PAGE_SHIFT;
+		hmm_pfns = &range->hmm_pfns[i];
+
+		cpu_flags = pud_to_hmm_pfn_flags(range, pud);
+		required_fault = hmm_range_need_fault(hmm_vma_walk, hmm_pfns,
+						      npages, cpu_flags);
+		if (required_fault) {
+			spin_unlock(ptl);
+			return hmm_vma_fault(addr, end, required_fault, walk);
+		}
+
+		pfn = pud_pfn(pud) + ((addr & ~PUD_MASK) >> PAGE_SHIFT);
+		for (i = 0; i < npages; ++i, ++pfn)
+			hmm_pfns[i] = pfn | cpu_flags;
+		goto out_unlock;
+	}
+
+	/* Ask for the PUD to be split */
+	walk->action = ACTION_SUBTREE;
+
+out_unlock:
+	spin_unlock(ptl);
+	return 0;
+}
+#else
+#define hmm_vma_walk_pud	NULL
+#endif
+
+#ifdef CONFIG_HUGETLB_PAGE
+static int hmm_vma_walk_hugetlb_entry(pte_t *pte, unsigned long hmask,
+				      unsigned long start, unsigned long end,
+				      struct mm_walk *walk)
+{
+	unsigned long addr = start, i, pfn;
+	struct hmm_vma_walk *hmm_vma_walk = walk->private;
+	struct hmm_range *range = hmm_vma_walk->range;
+	struct vm_area_struct *vma = walk->vma;
+	unsigned int required_fault;
+	unsigned long pfn_req_flags;
+	unsigned long cpu_flags;
+	spinlock_t *ptl;
+	pte_t entry;
+
+	ptl = huge_pte_lock(hstate_vma(vma), walk->mm, pte);
+	entry = huge_ptep_get(pte);
+
+	i = (start - range->start) >> PAGE_SHIFT;
+	pfn_req_flags = range->hmm_pfns[i];
+	cpu_flags = pte_to_hmm_pfn_flags(range, entry) |
+		    hmm_pfn_flags_order(huge_page_order(hstate_vma(vma)));
+	required_fault =
+		hmm_pte_need_fault(hmm_vma_walk, pfn_req_flags, cpu_flags);
+	if (required_fault) {
+		spin_unlock(ptl);
+		return hmm_vma_fault(addr, end, required_fault, walk);
+	}
+
+	pfn = pte_pfn(entry) + ((start & ~hmask) >> PAGE_SHIFT);
+	for (; addr < end; addr += PAGE_SIZE, i++, pfn++)
+		range->hmm_pfns[i] = pfn | cpu_flags;
+
+	spin_unlock(ptl);
+	return 0;
+}
+#else
+#define hmm_vma_walk_hugetlb_entry NULL
+#endif /* CONFIG_HUGETLB_PAGE */
+
+static int hmm_vma_walk_test(unsigned long start, unsigned long end,
+			     struct mm_walk *walk)
+{
+	struct hmm_vma_walk *hmm_vma_walk = walk->private;
+	struct hmm_range *range = hmm_vma_walk->range;
+	struct vm_area_struct *vma = walk->vma;
+
+	if (!(vma->vm_flags & (VM_IO | VM_PFNMAP)) &&
+	    vma->vm_flags & VM_READ)
+		return 0;
+
+	/*
+	 * vma ranges that don't have struct page backing them or map I/O
+	 * devices directly cannot be handled by hmm_range_fault().
+	 *
+	 * If the vma does not allow read access, then assume that it does not
+	 * allow write access either. HMM does not support architectures that
+	 * allow write without read.
+	 *
+	 * If a fault is requested for an unsupported range then it is a hard
+	 * failure.
+	 */
+	if (hmm_range_need_fault(hmm_vma_walk,
+				 range->hmm_pfns +
+					 ((start - range->start) >> PAGE_SHIFT),
+				 (end - start) >> PAGE_SHIFT, 0))
+		return -EFAULT;
+
+	hmm_pfns_fill(start, end, range, HMM_PFN_ERROR);
+
+	/* Skip this vma and continue processing the next vma. */
+	return 1;
+}
+
+static const struct mm_walk_ops hmm_walk_ops = {
+	.pud_entry	= hmm_vma_walk_pud,
+	.pmd_entry	= hmm_vma_walk_pmd,
+	.pte_hole	= hmm_vma_walk_hole,
+	.hugetlb_entry	= hmm_vma_walk_hugetlb_entry,
+	.test_walk	= hmm_vma_walk_test,
+};
+
+/**
+ * hmm_range_fault - try to fault some address in a virtual address range
+ * @range:	argument structure
+ *
+ * Returns 0 on success or one of the following error codes:
+ *
+ * -EINVAL:	Invalid arguments or mm or virtual address is in an invalid vma
+ *		(e.g., device file vma).
+ * -ENOMEM:	Out of memory.
+ * -EPERM:	Invalid permission (e.g., asking for write and range is read
+ *		only).
+ * -EBUSY:	The range has been invalidated and the caller needs to wait for
+ *		the invalidation to finish.
+ * -EFAULT:     A page was requested to be valid and could not be made valid
+ *              ie it has no backing VMA or it is illegal to access
+ *
+ * This is similar to get_user_pages(), except that it can read the page tables
+ * without mutating them (ie causing faults).
+ */
+int hmm_range_fault(struct hmm_range *range)
+{
+	struct hmm_vma_walk hmm_vma_walk = {
+		.range = range,
+		.last = range->start,
+	};
+	struct mm_struct *mm = range->notifier->mm;
+	int ret;
+
+	mmap_assert_locked(mm);
+
+	do {
+		/* If range is no longer valid force retry. */
+		if (mmu_interval_check_retry(range->notifier,
+					     range->notifier_seq))
+			return -EBUSY;
+		ret = walk_page_range(mm, hmm_vma_walk.last, range->end,
+				      &hmm_walk_ops, &hmm_vma_walk);
+		/*
+		 * When -EBUSY is returned the loop restarts with
+		 * hmm_vma_walk.last set to an address that has not been stored
+		 * in pfns. All entries < last in the pfn array are set to their
+		 * output, and all >= are still at their input values.
+		 */
+	} while (ret == -EBUSY);
+	return ret;
+}
+EXPORT_SYMBOL(hmm_range_fault);