wireguard-linux/drivers/hv, branch stable

Drivers: hv: Make CONFIG_HYPERV bool

2025-10-01T00:00:45Z

With CONFIG_HYPERV and CONFIG_HYPERV_VMBUS separated, change CONFIG_HYPERV to bool from tristate. CONFIG_HYPERV now becomes the core Hyper-V hypervisor support, such as hypercalls, clocks/timers, Confidential Computing setup, PCI passthru, etc. that doesn't involve VMBus or VMBus devices. Signed-off-by: Mukesh Rathor Signed-off-by: Wei Liu

Drivers: hv: Add CONFIG_HYPERV_VMBUS option

2025-10-01T00:00:42Z

At present VMBus driver is hinged off of CONFIG_HYPERV which entails lot of builtin code and encompasses too much. It's not always clear what depends on builtin hv code and what depends on VMBus. Setting CONFIG_HYPERV as a module and fudging the Makefile to switch to builtin adds even more confusion. VMBus is an independent module and should have its own config option. Also, there are scenarios like baremetal dom0/root where support is built in with CONFIG_HYPERV but without VMBus. Lastly, there are more features coming down that use CONFIG_HYPERV and add more dependencies on it. So, create a fine grained HYPERV_VMBUS option and update Kconfigs for dependency on VMBus. Signed-off-by: Mukesh Rathor Acked-by: Bjorn Helgaas # drivers/pci Signed-off-by: Wei Liu

Drivers: hv: vmbus: Fix typos in vmbus_drv.c

2025-09-30T23:31:00Z

Fix two minor typos in vmbus_drv.c: - Correct "reponsible" -> "responsible" in a comment. - Add missing newline in pr_err() message ("channeln" -> "channel\n"). These are cosmetic changes only and do not affect functionality. Signed-off-by: Alok Tiwari Reviewed-by: Michael Kelley Signed-off-by: Wei Liu

Drivers: hv: vmbus: Fix sysfs output format for ring buffer index

2025-09-30T23:31:00Z

The sysfs attributes out_read_index and out_write_index in vmbus_drv.c currently use %d to print outbound.current_read_index and outbound.current_write_index. These fields are u32 values, so printing them with %d (signed) is not logically correct. Update the format specifier to %u to correctly match their type. No functional change, only fixes the sysfs output format. Signed-off-by: Alok Tiwari Reviewed-by: Michael Kelley Signed-off-by: Wei Liu

Drivers: hv: vmbus: Clean up sscanf format specifier in target_cpu_store()

2025-09-30T23:30:56Z

The target_cpu_store() function parses the target CPU from the sysfs buffer using sscanf(). The format string currently uses "%uu", which is redundant. The compiler ignores the extra "u", so there is no incorrect parsing at runtime. Update the format string to use "%u" for clarity and consistency. Signed-off-by: Alok Tiwari Reviewed-by: Michael Kelley Signed-off-by: Wei Liu

x86/hyperv: Switch to msi_create_parent_irq_domain()

2025-09-30T22:50:48Z

Move away from the legacy MSI domain setup, switch to use msi_create_parent_irq_domain(). While doing the conversion, I noticed that hv_irq_compose_msi_msg() is doing more than it is supposed to (composing message content). The interrupt allocation bits should be moved into hv_msi_domain_alloc(). However, I have no hardware to test this change, therefore I leave a TODO note. Signed-off-by: Nam Cao Acked-by: Thomas Gleixner Tested-by: Nuno Das Neves Reviewed-by: Nuno Das Neves Signed-off-by: Wei Liu

mshv: Use common "entry virt" APIs to do work in root before running guest

2025-09-30T22:50:48Z

Use the kernel's common "entry virt" APIs to handle pending work prior to (re)entering guest mode, now that the virt APIs don't have a superfluous dependency on KVM. No functional change intended. Signed-off-by: Sean Christopherson Tested-by: Nuno Das Neves Reviewed-by: Nuno Das Neves Signed-off-by: Wei Liu

mshv: Handle NEED_RESCHED_LAZY before transferring to guest

2025-09-30T22:50:18Z

Check for NEED_RESCHED_LAZY, not just NEED_RESCHED, prior to transferring control to a guest. Failure to check for lazy resched can unnecessarily delay rescheduling until the next tick when using a lazy preemption model. Note, ideally both the checking and processing of TIF bits would be handled in common code, to avoid having to keep three separate paths synchronized, but defer such cleanups to the future to keep the fix as standalone as possible. Cc: Nuno Das Neves Cc: Mukesh R Fixes: 621191d709b1 ("Drivers: hv: Introduce mshv_root module to expose /dev/mshv to VMMs") Signed-off-by: Sean Christopherson Tested-by: Nuno Das Neves Reviewed-by: Nuno Das Neves Signed-off-by: Wei Liu

Drivers: hv: Simplify data structures for VMBus channel close message

2025-09-08T22:11:03Z

struct vmbus_close_msg is used for sending the VMBus channel close message. It contains a struct vmbus_channel_msginfo, which has a flex array member at the end. The latter's presence in the middle of struct vmbus_close_msg causes warnings when built with -Wflex-array-member-not-at-end. But the struct vmbus_channel_msginfo is unused because the Hyper-V host does not send a response to the channel close message. So remove the struct vmbus_channel_msginfo. Then, since the only remaining field is struct vmbus_channel_close_channel, also remove the containing struct vmbus_close_msg and directly use struct vmbus_channel_close_channel. Besides eliminating unnecessary complexity, these changes resolve the -Wflex-array-member-not-at-end warnings. Signed-off-by: Michael Kelley Reviewed-by: Tianyu Lan Signed-off-by: Wei Liu

Drivers: hv: util: Cosmetic changes for hv_utils_transport.c

2025-09-08T22:10:55Z

Fix issues reported by checkpatch.pl script for hv_utils_transport.c file - Update pr_warn() calls to use __func__ for consistent logging context. - else should follow close brace '}' No functional changes intended. Signed-off-by: Abhishek Tiwari Reviewed-by: Naman Jain Signed-off-by: Wei Liu