KVM: selftests: Dedup assembly code for VMLAUNCH and VMRESUME

Dedup the assembly code for VMLAUNCH vs. VMRESUME, for both architectural
VMCS and eVMCS, as the difference is literally only the actual VM-Enter
instruction for VMLAUNCH vs. VMRESUME, and VMWRITE vs. MOV for VMCS vs.
eVMCS.

Opportunistically place the implementations in vmx.c so that the lengthy
sequence (~580 bytes of code) aren't inlined for every single VM-Enter.

000000000041b910 <__vmlaunch>:
  41b910:       80 3d 61 5e 10 00 00                            cmpb   $0x0,0x105e61(%rip)        # 521778 <enable_evmcs>
  41b917:       0f 85 13 01 00 00                               jne    41ba30 <__vmlaunch+0x120>
  41b91d:       ba 14 6c 00 00                                  mov    $0x6c14,%edx
  41b922:       b9 16 6c 00 00                                  mov    $0x6c16,%ecx
  41b927:       6a 00                                           push   $0x0
  41b929:       0f 79 d4                                        vmwrite %rsp,%rdx
  41b92c:       48 8d 05 82 00 00 00                            lea    0x82(%rip),%rax        # 41b9b5 <__vmlaunch+0xa5>
  41b933:       0f 79 c8                                        vmwrite %rax,%rcx
  <xchg GPRs>
  41b9ae:       0f 01 c2                                        vmlaunch
  41b9b1:       48 ff 04 24                                     incq   (%rsp)
  <xchg GPRs>
  41ba2d:       58                                              pop    %rax
  41ba2e:       c3                                              ret
  41ba2f:       90                                              nop
  41ba30:       48 8b 35 39 5d 10 00                            mov    0x105d39(%rip),%rsi        # 521770 <current_evmcs>
  41ba37:       c7 86 38 03 00 00 00 00 00 00                   movl   $0x0,0x338(%rsi)
  41ba41:       6a 00                                           push   $0x0
  41ba43:       48 89 a6 68 02 00 00                            mov    %rsp,0x268(%rsi)
  41ba4a:       48 8d 05 83 00 00 00                            lea    0x83(%rip),%rax        # 41bad4 <__vmlaunch+0x1c4>
  41ba51:       48 89 46 50                                     mov    %rax,0x50(%rsi)
  <xchg GPRs>
  41bacd:       0f 01 c2                                        vmlaunch
  41bad0:       48 ff 04 24                                     incq   (%rsp)
  <xchg GPRs>
  41bb4c:       58                                              pop    %rax
  41bb4d:       c3                                              ret

No functional change intended (though the code generation will be quite
different).

Cc: Yosry Ahmed <yosry@kernel.org>
Link: https://patch.msgid.link/20260904002423.3154436-14-seanjc@google.com
Signed-off-by: Sean Christopherson <seanjc@google.com>

0 files changed, 0 insertions, 0 deletions