VMX HOST_RIP target alignment
From: Alexey Dobriyan
Date: Thu Nov 17 2022 - 15:46:17 EST
One of the side effects of fixing retbleed for VMX was demoting
HOST_RIP target from honorable function to a lowly label:
-SYM_FUNC_START(vmx_vmexit)
+SYM_INNER_LABEL(vmx_vmexit, SYM_L_GLOBAL)
ffffffff81243c49: 0f 01 c2 vmlaunch
ffffffff81243c4c: e9 a7 00 00 00 jmp ffffffff81243cf8 <vmx_vmexit+0xa7>
ffffffff81243c51 <vmx_vmexit>:
ffffffff81243c51: 50 push rax
Now I've never measured VM exit latency but is it important to align it
at 16 bytes like Intel recommends for functions?
vmalexey