linux.git/include/hyperv, branch v6.18.21

hyperv: Remove the spurious null directive line

2025-10-02T21:21:24+00:00

The file contains a line that consists of the lone # symbol
followed by a newline. While that is a valid syntax as
defined by the C99+ grammar (6.10.7 "Null directive"), it
serves no apparent purpose in this case.

Remove the null preprocessor directive. No functional changes.

Fixes: e68bda71a238 ("hyperv: Add new Hyper-V headers in include/hyperv")
Signed-off-by: Roman Kisel 
Reviewed-by: Easwar Hariharan 
Signed-off-by: Wei Liu

hyperv: Add missing field to hv_output_map_device_interrupt

2025-09-08T22:10:35+00:00

This field is unused, but the correct structure size is needed
when computing the amount of space for the output argument to
reside, so that it does not cross a page boundary.

Signed-off-by: Nuno Das Neves 
Reviewed-by: Michael Kelley 
Signed-off-by: Wei Liu

Merge tag 'hyperv-next-signed-20250602' of git://git.kernel.org/pub/scm/linux/kernel/git/hyperv/linux

2025-06-03T15:39:20+00:00

Pull hyperv updates from Wei Liu:

 - Support for Virtual Trust Level (VTL) on arm64 (Roman Kisel)

 - Fixes for Hyper-V UIO driver (Long Li)

 - Fixes for Hyper-V PCI driver (Michael Kelley)

 - Select CONFIG_SYSFB for Hyper-V guests (Michael Kelley)

 - Documentation updates for Hyper-V VMBus (Michael Kelley)

 - Enhance logging for hv_kvp_daemon (Shradha Gupta)

* tag 'hyperv-next-signed-20250602' of git://git.kernel.org/pub/scm/linux/kernel/git/hyperv/linux: (23 commits)
  Drivers: hv: Always select CONFIG_SYSFB for Hyper-V guests
  Drivers: hv: vmbus: Add comments about races with "channels" sysfs dir
  Documentation: hyperv: Update VMBus doc with new features and info
  PCI: hv: Remove unnecessary flex array in struct pci_packet
  Drivers: hv: Remove hv_alloc/free_* helpers
  Drivers: hv: Use kzalloc for panic page allocation
  uio_hv_generic: Align ring size to system page
  uio_hv_generic: Use correct size for interrupt and monitor pages
  Drivers: hv: Allocate interrupt and monitor pages aligned to system page boundary
  arch/x86: Provide the CPU number in the wakeup AP callback
  x86/hyperv: Fix APIC ID and VP index confusion in hv_snp_boot_ap()
  PCI: hv: Get vPCI MSI IRQ domain from DeviceTree
  ACPI: irq: Introduce acpi_get_gsi_dispatcher()
  Drivers: hv: vmbus: Introduce hv_get_vmbus_root_device()
  Drivers: hv: vmbus: Get the IRQ number from DeviceTree
  dt-bindings: microsoft,vmbus: Add interrupt and DMA coherence properties
  arm64, x86: hyperv: Report the VTL the system boots in
  arm64: hyperv: Initialize the Virtual Trust Level field
  Drivers: hv: Provide arch-neutral implementation of get_vtl()
  Drivers: hv: Enable VTL mode for arm64
  ...

x86/hyperv: Fix APIC ID and VP index confusion in hv_snp_boot_ap()

2025-05-23T16:30:56+00:00

To start an application processor in SNP-isolated guest, a hypercall
is used that takes a virtual processor index. The hv_snp_boot_ap()
function uses that START_VP hypercall but passes as VP index to it
what it receives as a wakeup_secondary_cpu_64 callback: the APIC ID.

As those two aren't generally interchangeable, that may lead to hung
APs if the VP index and the APIC ID don't match up.

Update the parameter names to avoid confusion as to what the parameter
is. Use the APIC ID to the VP index conversion to provide the correct
input to the hypercall.

Cc: stable@vger.kernel.org
Fixes: 44676bb9d566 ("x86/hyperv: Add smp support for SEV-SNP guest")
Signed-off-by: Roman Kisel 
Reviewed-by: Michael Kelley 
Link: https://lore.kernel.org/r/20250507182227.7421-2-romank@linux.microsoft.com
Signed-off-by: Wei Liu 
Message-ID: <20250507182227.7421-2-romank@linux.microsoft.com>

Drivers: hv: Provide arch-neutral implementation of get_vtl()

2025-05-23T16:30:55+00:00

To run in the VTL mode, Hyper-V drivers have to know what
VTL the system boots in, and the arm64/hyperv code does not
have the means to compute that.

Refactor the code to hoist the function that detects VTL,
make it arch-neutral to be able to employ it to get the VTL
on arm64.

Signed-off-by: Roman Kisel 
Reviewed-by: Michael Kelley 
Reviewed-by: Tianyu Lan 
Link: https://lore.kernel.org/r/20250428210742.435282-5-romank@linux.microsoft.com
Signed-off-by: Wei Liu 
Message-ID: <20250428210742.435282-5-romank@linux.microsoft.com>

x86/msr: Rename 'wrmsrl()' to 'wrmsrq()'

2025-04-10T09:58:33+00:00

Suggested-by: "H. Peter Anvin" 
Signed-off-by: Ingo Molnar 
Acked-by: Peter Zijlstra (Intel) 
Cc: Juergen Gross 
Cc: Dave Hansen 
Cc: Xin Li 
Cc: Linus Torvalds

x86/msr: Rename 'rdmsrl()' to 'rdmsrq()'

2025-04-10T09:58:27+00:00

Suggested-by: "H. Peter Anvin" 
Signed-off-by: Ingo Molnar 
Acked-by: Peter Zijlstra (Intel) 
Cc: Juergen Gross 
Cc: Dave Hansen 
Cc: Xin Li 
Cc: Linus Torvalds

x86/hyperv: Add comments about hv_vpset and var size hypercall input args

2025-03-21T18:24:22+00:00

Current code varies in how the size of the variable size input header
for hypercalls is calculated when the input contains struct hv_vpset.
Surprisingly, this variation is correct, as different hypercalls make
different choices for what portion of struct hv_vpset is treated as part
of the variable size input header. The Hyper-V TLFS is silent on these
details, but the behavior has been confirmed with Hyper-V developers.

To avoid future confusion about these differences, add comments to
struct hv_vpset, and to hypercall call sites with input that contains
a struct hv_vpset. The comments describe the overall situation and
the calculation that should be used at each particular call site.

No functional change as only comments are updated.

Signed-off-by: Michael Kelley 
Link: https://lore.kernel.org/r/20250318214919.958953-1-mhklinux@outlook.com
Signed-off-by: Wei Liu 
Message-ID: <20250318214919.958953-1-mhklinux@outlook.com>

hyperv: Add definitions for root partition driver to hv headers

2025-03-20T21:23:04+00:00

A few additional definitions are required for the mshv driver code
(to follow). Introduce those here and clean up a little bit while
at it.

Signed-off-by: Nuno Das Neves 
Reviewed-by: Roman Kisel 
Reviewed-by: Stanislav Kinsburskii 
Reviewed-by: Tianyu Lan 
Link: https://lore.kernel.org/r/1741980536-3865-10-git-send-email-nunodasneves@linux.microsoft.com
Signed-off-by: Wei Liu 
Message-ID: <1741980536-3865-10-git-send-email-nunodasneves@linux.microsoft.com>

hyperv: Move hv_current_partition_id to arch-generic code

2025-02-13T23:38:47+00:00

Move hv_current_partition_id and hv_get_partition_id() to hv_common.c,
and call hv_get_partition_id() on arm64 in hyperv_init(). These aren't
specific to x86_64 and will be needed by common code.

Set hv_current_partition_id to HV_PARTITION_ID_SELF by default.

Rename struct hv_get_partition_id to hv_output_get_partition_id, to
make it distinct from the function hv_get_partition_id(), and match
the original Hyper-V struct name.

Remove the BUG()s. Failing to get the id need not crash the machine.

Signed-off-by: Nuno Das Neves 
Reviewed-by: Michael Kelley 
Link: https://lore.kernel.org/r/1738955002-20821-2-git-send-email-nunodasneves@linux.microsoft.com
Signed-off-by: Wei Liu 
Message-ID: <1738955002-20821-2-git-send-email-nunodasneves@linux.microsoft.com>