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Vishal Verma
907092bf7c
Eliminate a lot of stub definitions by using macros to define the TDX vs
non-TDX versions of various x86_ops. Moving the x86_ops wrappers under
CONFIG_KVM_INTEL_TDX also allows nearly all of vmx/main.c to go under a
single #ifdef, eliminating trampolines in the generated code, and almost
all of the stubs.
For example, with CONFIG_KVM_INTEL_TDX=n, before this cleanup,
vt_refresh_apicv_exec_ctrl() would produce:
0000000000036490 <vt_refresh_apicv_exec_ctrl>:
36490: f3 0f 1e fa endbr64
36494: e8 00 00 00 00 call 36499 <vt_refresh_apicv_exec_ctrl+0x9>
36495: R_X86_64_PLT32 __fentry__-0x4
36499: e9 00 00 00 00 jmp 3649e <vt_refresh_apicv_exec_ctrl+0xe>
3649a: R_X86_64_PLT32 vmx_refresh_apicv_exec_ctrl-0x4
3649e: 66 90 xchg %ax,%ax
After this patch, this is completely eliminated.
Based on a patch by Sean Christopherson <seanjc@google.com>
Link: https://lore.kernel.org/kvm/Z6v9yjWLNTU6X90d@google.com/
Cc: Sean Christopherson <seanjc@google.com>
Cc: Rick Edgecombe <rick.p.edgecombe@intel.com>
Signed-off-by: Vishal Verma <vishal.l.verma@intel.com>
Link: https://lore.kernel.org/r/20250318-vverma7-cleanup_x86_ops-v2-4-701e82d6b779@intel.com
Signed-off-by: Sean Christopherson <seanjc@google.com>
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the reStructuredText markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.