kernel/linux.git/arch/x86/hyperv/nested.c, branch v6.19.11

x86/hyperv: Fix warnings for missing export.h header inclusion

2025-07-09T23:43:53+00:00

Fix below warning in Hyper-V drivers that comes when kernel is compiled with W=1 option. Include export.h in driver files to fix it. * warning: EXPORT_SYMBOL() is used, but #include is missing Signed-off-by: Naman Jain Reviewed-by: Saurabh Sengar Link: https://lore.kernel.org/r/20250611100459.92900-3-namjain@linux.microsoft.com Signed-off-by: Wei Liu Message-ID: <20250611100459.92900-3-namjain@linux.microsoft.com>

hyperv: Switch from hyperv-tlfs.h to hyperv/hvhdk.h

2025-01-10T00:54:21+00:00

Switch to using hvhdk.h everywhere in the kernel. This header includes all the new Hyper-V headers in include/hyperv, which form a superset of the definitions found in hyperv-tlfs.h. This makes it easier to add new Hyper-V interfaces without being restricted to those in the TLFS doc (reflected in hyperv-tlfs.h). To be more consistent with the original Hyper-V code, the names of some definitions are changed slightly. Update those where needed. Update comments in mshyperv.h files to point to include/hyperv for adding new definitions. Signed-off-by: Nuno Das Neves Reviewed-by: Michael Kelley Reviewed-by: Easwar Hariharan Signed-off-by: Roman Kisel Reviewed-by: Easwar Hariharan Link: https://lore.kernel.org/r/1732577084-2122-5-git-send-email-nunodasneves@linux.microsoft.com Link: https://lore.kernel.org/r/20250108222138.1623703-3-romank@linux.microsoft.com Signed-off-by: Wei Liu

x86/hyperv: Improve code for referencing hyperv_pcpu_input_arg

2023-06-28T17:53:25+00:00

Several places in code for Hyper-V reference the per-CPU variable hyperv_pcpu_input_arg. Older code uses a multi-line sequence to reference the variable, and usually includes a cast. Newer code does a much simpler direct assignment. The latter is preferable as the complexity of the older code is unnecessary. Update older code to use the simpler direct assignment. Signed-off-by: Nischala Yelchuri Link: https://lore.kernel.org/r/1687286438-9421-1-git-send-email-niyelchu@linux.microsoft.com Signed-off-by: Wei Liu

drivers: hv: Create a consistent pattern for checking Hyper-V hypercall status

2021-04-21T09:49:19+00:00

There is not a consistent pattern for checking Hyper-V hypercall status. Existing code uses a number of variants. The variants work, but a consistent pattern would improve the readability of the code, and be more conformant to what the Hyper-V TLFS says about hypercall status. Implemented new helper functions hv_result(), hv_result_success(), and hv_repcomp(). Changed the places where hv_do_hypercall() and related variants are used to use the helper functions. Signed-off-by: Joseph Salisbury Reviewed-by: Michael Kelley Link: https://lore.kernel.org/r/1618620183-9967-2-git-send-email-joseph.salisbury@linux.microsoft.com Signed-off-by: Wei Liu

x86/hyper-v: Add HvFlushGuestAddressList hypercall support

2018-12-21T10:28:39+00:00

Hyper-V provides HvFlushGuestAddressList() hypercall to flush EPT tlb with specified ranges. This patch is to add the hypercall support. Reviewed-by: Michael Kelley Signed-off-by: Lan Tianyu Signed-off-by: Paolo Bonzini

X86/Hyper-V: Add hyperv_nested_flush_guest_mapping ftrace support

2018-08-06T15:59:05+00:00

This patch is to add hyperv_nested_flush_guest_mapping support to trace hvFlushGuestPhysicalAddressSpace hypercall. Signed-off-by: Lan Tianyu Acked-by: K. Y. Srinivasan Signed-off-by: Paolo Bonzini

X86/Hyper-V: Add flush HvFlushGuestPhysicalAddressSpace hypercall support

2018-08-06T15:59:04+00:00

Hyper-V supports a pv hypercall HvFlushGuestPhysicalAddressSpace to flush nested VM address space mapping in l1 hypervisor and it's to reduce overhead of flushing ept tlb among vcpus. This patch is to implement it. Signed-off-by: Lan Tianyu Acked-by: K. Y. Srinivasan Signed-off-by: Paolo Bonzini