On Thu, Jun 30, 2022 at 12:36 AM Vitaly Kuznetsov <vkuznets@xxxxxxxxxx> wrote: > > Jim Mattson <jmattson@xxxxxxxxxx> writes: > > > On Wed, Jun 29, 2022 at 8:07 AM Vitaly Kuznetsov <vkuznets@xxxxxxxxxx> wrote: > >> > >> vmcs_config has cased host MSR_IA32_VMX_MISC value, use it for setting > >> up nested MSR_IA32_VMX_MISC in nested_vmx_setup_ctls_msrs() and avoid the > >> redundant rdmsr(). > >> > >> No (real) functional change intended. > > > > Just imaginary functional change? :-) > > > > Well, yea) The assumption here is that MSR_IA32_VMX_MISC's value doesn't > change underneath KVM, caching doesn't change anything then. It is, of > course, possible that when KVM runs as a nested hypervisor on top of > something else, it will observe different values. I truly hope this is > purely imaginary :-) It is also theoretically possible that a late-loadable microcode patch could change the value of the MSR, but Intel wouldn't do that to us, would they?
