2018-03-15 18:02+0100, Radim Krčmář: > We actually already have mov in the assembly: > > "cmp %%" _ASM_SP ", %c[host_rsp](%0) \n\t" Oh hell, I didn't pay attention to this line before. > "je 1f \n\t" > "mov %%" _ASM_SP ", %c[host_rsp](%0) \n\t" // here > __ex(ASM_VMX_VMWRITE_RSP_RDX) "\n\t" I bet this path is executed only once in VM's lifetime and what we're doing is wasting more resources than we're ever going to save ... > "1: \n\t"