On 16/10/19 18:25, Xiaoyao Li wrote: >> >> 3 | Y | Y | N | Y | x | Switch >> MSR_TEST_CTRL on >> | | | | | | enter/exit, >> plus: >> | | | | | | A) #AC >> forwarded to guest. >> | | | | | | B) SIGBUS or >> KVM exit code >> > > I just want to get confirmed that in (3), we should split into 2 case: > > a) if host has it enabled, still apply the constraint that guest is > forcibly enabled? so we don't switch MSR_TEST_CTL. > > b) if host has it disabled, we can switch MSR_TEST_CTL on enter/exit. That's doable, yes. Paolo
