On Wed, Jul 13, 2022 at 11:33 AM Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx> wrote: > > So I think that that is where the "xaddw_ax_dx+8" comes from: some > code assumes that FASTOP_SIZE is 8, but that xaddw_ax_dx case was > actually 9 bytes and thus got that "int3 + padding" in the next 8 > bytes. > > The whole kvm x86 emulation thing is quite complicated and has lots > of instruction size #defines and magic. > > I'm not familiar enough with it to go "Ahh, it's obviously XYZ", but > I'm sure PeterZ and Borislav know exactly what's going on. And I see that Thadeau already figured it out: https://lore.kernel.org/all/20220713171241.184026-1-cascardo@xxxxxxxxxxxxx/ So presumably we need that patch everywhere. Linus
