Radim Krčmář <rkrc...@redhat.com> writes: > 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. >
This is still going to work if we conditionally replace it with pointer to evmcs as you suggested before but ... >> "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 ... > yes, we're not gonna save anything... -- Vitaly
