kernel/git/next/linux-next.git/drivers/hv, branch master

mshv: use hmm_range_fault_unlocked_timeout() for region faults

2026-07-14T04:47:11+00:00

MSHV currently faults movable memory regions by taking mmap_read_lock() around hmm_range_fault(). That prevents the fault path from handling VMAs whose fault handlers need to drop mmap_lock, such as userfaultfd-backed mappings. Use hmm_range_fault_unlocked_timeout() instead. Passing a timeout of 0 preserves MSHV's existing unbounded retry behavior while letting the HMM helper own mmap_lock acquisition and refresh range->notifier_seq internally before walking the range. After the fault succeeds, MSHV still takes mreg_mutex and checks mmu_interval_read_retry() before installing the pages into the region, so the existing invalidation synchronization is preserved. Fold the small fault-and-lock helper into mshv_region_range_fault(), since the remaining retry path is just the standard "fault, take the driver lock, check the interval notifier sequence" pattern. Link: https://lore.kernel.org/178371881034.900500.5214601525971121683.stgit@skinsburskii Signed-off-by: Stanislav Kinsburskii Reviewed-by: Jason Gunthorpe Cc: Danilo Krummrich Cc: Dave Airlie Cc: David Hildenbrand Cc: Dexuan Cui Cc: Haiyang Zhang Cc: Jonathan Corbet Cc: Kees Cook Cc: K. Y. Srinivasan Cc: Leon Romanovsky Cc: Liam R. Howlett Cc: Lizhi Hou Cc: Long Li Cc: Lorenzo Stoakes Cc: Lyude Cc: Maarten Lankhorst Cc: Maxime Ripard Cc: Michal Hocko Cc: Mike Rapoport Cc: Oded Gabbay Cc: Oleg Nesterov Cc: Shuah Khan Cc: Suren Baghdasaryan Cc: Thomas Zimemrmann Cc: Vlastimil Babka Cc: Wei Liu Signed-off-by: Andrew Morton

Merge tag 'hyperv-next-signed-20260621' of git://git.kernel.org/pub/scm/linux/kernel/git/hyperv/linux

2026-06-22T15:06:13+00:00

Pull hyperv updates from Wei Liu: - Use wakeup mailbox to boot APs in Hyper-V VTL2 TDX guests (Yunhong Jiang, Ricardo Neri) - Move the Hyper-V IOMMU to its own subdirectory (Mukesh Rathor) - Cosmetic changes to mshv and balloon driver (Junrui Luo, Markus Elfring) * tag 'hyperv-next-signed-20260621' of git://git.kernel.org/pub/scm/linux/kernel/git/hyperv/linux: mshv: add bounds check on vp_index in mshv_intercept_isr() hv_balloon: Simplify data output in hv_balloon_debug_show() x86/hyperv: Cosmetic changes in irqdomain.c for readability iommu/hyperv: Create hyperv subdirectory under drivers/iommu x86/hyperv/vtl: Use the wakeup mailbox to boot secondary CPUs x86/hyperv/vtl: Mark the wakeup mailbox page as private x86/acpi: Add a helper to get the address of the wakeup mailbox x86/hyperv/vtl: Setup the 64-bit trampoline for TDX guests x86/realmode: Make the location of the trampoline configurable x86/hyperv/vtl: Set real_mode_header in hv_vtl_init_platform() x86/dt: Parse the Wakeup Mailbox for Intel processors dt-bindings: reserved-memory: Wakeup Mailbox for Intel processors x86/acpi: Add functions to setup and access the wakeup mailbox x86/topology: Add missing struct declaration and attribute dependency

Merge tag 'x86-msr-2026-06-14' of gitolite.kernel.org:pub/scm/linux/kernel/git/tip/tip

2026-06-15T09:38:14+00:00

Pull x86/msr updates from Ingo Molnar: - Large series to reorganize the rdmsr/wrmsr APIs to remove 32-bit variants and convert to 64-bit variants (Juergen Gross) - Fix W=1 warning (HyeongJun An) * tag 'x86-msr-2026-06-14' of gitolite.kernel.org:pub/scm/linux/kernel/git/tip/tip: x86/msr: Remove wrmsrl() x86/msr: Switch wrmsrl() users to wrmsrq() x86/msr: Remove rdmsrl() x86/msr: Switch rdmsrl() users to rdmsrq() x86/msr: Remove wrmsr_safe_on_cpu() x86/msr: Switch wrmsr_safe_on_cpu() users to wrmsrq_safe_on_cpu() x86/msr: Remove rdmsr_safe_on_cpu() x86/msr: Switch rdmsr_safe_on_cpu() users to rdmsrq_safe_on_cpu() x86/msr: Don't use rdmsr_safe_on_cpu() in rdmsrq_safe_on_cpu() x86/msr: Remove wrmsr_on_cpu() x86/msr: Switch wrmsr_on_cpu() users to wrmsrq_on_cpu() x86/msr: Remove rdmsr_on_cpu() x86/msr: Switch rdmsr_on_cpu() users to rdmsrq_on_cpu() x86/msr: Remove rdmsrl_on_cpu() x86/msr: Switch rdmsrl_on_cpu() user to rdmsrq_on_cpu() x86/process: Convert rdmsr() to rdmsrq() in arch_post_acpi_subsys_init() to address W=1 warning

Merge tag 'driver-core-7.2-rc1' of gitolite.kernel.org:pub/scm/linux/kernel/git/driver-core/driver-core

2026-06-15T07:11:17+00:00

Pull driver core updates from Danilo Krummrich: "Deferred probe: - Fix race where deferred probe timeout work could be permanently canceled by using mod_delayed_work() - Fix missing jiffies conversion in deferred_probe_extend_timeout() - Guard timeout extension with delayed_work_pending() to prevent premature firing - Use system_percpu_wq instead of the deprecated system_wq - Update deferred_probe_timeout documentation device: - Replace direct struct device bitfield access (can_match, dma_iommu, dma_skip_sync, dma_ops_bypass, state_synced, dma_coherent, of_node_reused, offline, offline_disabled) with flag-based accessors using bit operations - Reject devices with unregistered buses - Delete unused DEVICE_ATTR_PREALLOC() - Add low-level device attribute macros with const show/store callbacks, allowing device attributes to reside in read-only memory - Move core device attributes to read-only memory - Constify group array pointers in driver_add_groups() / driver_remove_groups(), struct bus_type, and struct device_driver device property: - Fix fwnode reference leak in fwnode_graph_get_endpoint_by_id() - Initialize all fields of fwnode_handle in fwnode_init() - Provide swnode_get()/swnode_put() wrappers around kobject_get/put() - Allow passing struct software_node_ref_args pointers directly to PROPERTY_ENTRY_REF() driver_override: - Migrate amba, cdx, vmbus, and rpmsg to the generic driver_override infrastructure, fixing a UAF from unsynchronized access to driver_override in bus match() callbacks - Remove the now-unused driver_set_override() firmware loader: - Fix recursive lock deadlock in device_cache_fw_images() when async work falls back to synchronous execution - Fix device reference leak in firmware_upload_register() platform: - Pass KBUILD_MODNAME through the platform driver registration macro to create module symlinks in sysfs for built-in drivers; move module_kset initialization to a pure_initcall and tegra cbb registration to core_initcall to ensure correct ordering - Pass THIS_MODULE implicitly through a coresight_init_driver() macro sysfs: - Upgrade OOB write detection in sysfs_kf_seq_show() from printk to WARN - Add return value clamping to sysfs_kf_read() Rust: - ACPI: Fix missing match data for PRP0001 by exporting acpi_of_match_device() - Auxiliary: Replace drvdata() with dedicated registration data on auxiliary_device. drvdata() exposed the driver's bus device private data beyond the driver's own scope, creating ordering constraints and forcing the data to outlive all registrations that access it. Registration data is instead scoped structurally to the Registration object, making lifecycle ordering enforced by construction rather than convention. - Rust-native device driver lifetimes (HRT): Allow Rust device drivers to carry a lifetime parameter on their bus device private data, tied to the device binding scope -- the interval during which a bus device is bound to a driver. Device resources like pci::Bar<'a> and IoMem<'a> can be stored directly in the driver's bus device private data with a lifetime bounded by the binding scope, so the compiler enforces at build time that they do not outlive the binding. This removes Devres indirection from every access site and eliminates try_access() failure paths in destructors. Bus driver traits use a Generic Associated Type (GAT) Data<'bound> to introduce the lifetime on the private data, rather than parameterizing the Driver trait itself. Auxiliary registration data, where the lifetime is not introduced by a trait callback but must be threaded through Registration, uses the ForLt trait (a type-level abstraction for types generic over a lifetime). Misc: - Fix DT overlayed devices not probing by reverting the broken treewide overlay fix and re-running fw_devlink consumer pickup when an overlay is applied to a bound device - Use root_device_register() for faux bus root device; add sanity check for failed bus init - Fix dev_has_sync_state() data race with READ_ONCE() and move it to base.h - Avoid spurious device_links warning when removing a device while its supplier is unbinding - Switch ISA bus to dynamic root device - Fix suspicious RCU usage in kernfs_put() - Remove devcoredump exit callback - Constify devfreq_event_class" * tag 'driver-core-7.2-rc1' of gitolite.kernel.org:pub/scm/linux/kernel/git/driver-core/driver-core: (81 commits) software node: allow passing reference args to PROPERTY_ENTRY_REF() driver core: platform: set mod_name in driver registration coresight: pass THIS_MODULE implicitly through a macro kernel: param: initialize module_kset in a pure_initcall soc/tegra: cbb: Move driver registration from pure_initcall to core_initcall firmware_loader: Fix recursive lock in device_cache_fw_images() driver core: Use system_percpu_wq instead of system_wq driver core: remove driver_set_override() rpmsg: use generic driver_override infrastructure Drivers: hv: vmbus: use generic driver_override infrastructure cdx: use generic driver_override infrastructure amba: use generic driver_override infrastructure rust: devres: add 'static bound to Devres samples: rust: rust_driver_auxiliary: showcase lifetime-bound registration data rust: auxiliary: generalize Registration over ForLt rust: types: add `ForLt` trait for higher-ranked lifetime support gpu: nova-core: separate driver type from driver data samples: rust: rust_driver_pci: use HRT lifetime for Bar rust: io: make IoMem and ExclusiveIoMem lifetime-parameterized rust: pci: make Bar lifetime-parameterized ...

x86/msr: Switch wrmsrl() users to wrmsrq()

2026-06-08T11:16:35+00:00

wrmsrl() is a deprecated synonym for wrmsrq(). Switch its users to wrmsrq(). Signed-off-by: Juergen Gross Signed-off-by: Ingo Molnar Cc: Sean Christopherson Cc: Paolo Bonzini Cc: "K. Y. Srinivasan" Cc: Haiyang Zhang Cc: Wei Liu Cc: Dexuan Cui Cc: Long Li Cc: "Rafael J. Wysocki" Cc: Artem Bityutskiy Link: https://patch.msgid.link/20260608082809.3492719-4-jgross@suse.com

x86/msr: Switch rdmsrl() users to rdmsrq()

2026-06-08T11:16:34+00:00

rdmsrl() is a deprecated synonym for rdmsrq(). Switch its users to rdmsrq(). Signed-off-by: Juergen Gross Signed-off-by: Ingo Molnar Cc: "K. Y. Srinivasan" Cc: Haiyang Zhang Cc: Wei Liu Cc: Dexuan Cui Cc: Long Li Cc: "Rafael J. Wysocki" Cc: Artem Bityutskiy Link: https://patch.msgid.link/20260608082809.3492719-2-jgross@suse.com

mshv: add bounds check on vp_index in mshv_intercept_isr()

2026-06-08T06:22:46+00:00

mshv_intercept_isr() extracts vp_index from the hypervisor message payload and uses it directly to index into pt_vp_array without validation. handle_bitset_message() and handle_pair_message() already validate vp_index against MSHV_MAX_VPS before array access. Add the same MSHV_MAX_VPS bounds check for consistency with the other message handlers. Fixes: 621191d709b1 ("Drivers: hv: Introduce mshv_root module to expose /dev/mshv to VMMs") Reported-by: Yuhao Jiang Signed-off-by: Junrui Luo Signed-off-by: Wei Liu

hv_balloon: Simplify data output in hv_balloon_debug_show()

2026-06-08T06:13:15+00:00

Move the specification for a line break from a seq_puts() call to a seq_printf() call. The source code was transformed by using the Coccinelle software. Signed-off-by: Markus Elfring Reviewed-by: Sahil Chandna Signed-off-by: Wei Liu

Drivers: hv: vmbus: use generic driver_override infrastructure

2026-05-30T20:25:36+00:00

When a driver is probed through __driver_attach(), the bus' match() callback is called without the device lock held, thus accessing the driver_override field without a lock, which can cause a UAF. Fix this by using the driver-core driver_override infrastructure taking care of proper locking internally. Note that calling match() from __driver_attach() without the device lock held is intentional. [1] Tested-by: Michael Kelley Reviewed-by: Michael Kelley Link: https://lore.kernel.org/driver-core/DGRGTIRHA62X.3RY09D9SOK77P@kernel.org/ [1] Reported-by: Gui-Dong Han Closes: https://bugzilla.kernel.org/show_bug.cgi?id=220789 Fixes: d765edbb301c ("vmbus: add driver_override support") Reviewed-by: Greg Kroah-Hartman Link: https://patch.msgid.link/20260505133935.3772495-4-dakr@kernel.org Signed-off-by: Danilo Krummrich

mshv: support 1G hugepages by passing them as 2M-aligned chunks

2026-05-27T22:30:15+00:00

The hypervisor's map GPA hypercall coalesces contiguous 2M-aligned chunks into 1G mappings when alignment permits, so the driver can support 1G hugepages by feeding them in as 2M chunks. Note that this is the only way to make 1G mappings; there is no way to directly map a 1G hugepage using the hypercall. Always emit a 2M (PMD_ORDER) stride for the huge-page case. The hypercall has no 1G stride, so 1G folios are processed as a sequence of 2M chunks. Folios whose order is less than PMD_ORDER (e.g. mTHP) fall back to single-page stride; mapping them as 2M would fail in the hypervisor anyway. Assisted-by: Copilot-CLI:claude-opus-4.7 Signed-off-by: Anirudh Rayabharam (Microsoft) Acked-by: Stanislav Kinsburskii Reviewed-by: Michael Kelley Signed-off-by: Wei Liu