Re: [PATCH] vmxcap: add tertiary execution controls

[Vitaly Kuznetsov]

Paolo Bonzini <pbonzini@redhat.com> writes:

> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
> ---
>  scripts/kvm/vmxcap | 17 +++++++++++++++++
>  1 file changed, 17 insertions(+)
>
> diff --git a/scripts/kvm/vmxcap b/scripts/kvm/vmxcap
> index f140040104..ce27f5e635 100755
> --- a/scripts/kvm/vmxcap
> +++ b/scripts/kvm/vmxcap
> @@ -23,6 +23,7 @@ MSR_IA32_VMX_TRUE_PROCBASED_CTLS = 0x48E
>  MSR_IA32_VMX_TRUE_EXIT_CTLS = 0x48F
>  MSR_IA32_VMX_TRUE_ENTRY_CTLS = 0x490
>  MSR_IA32_VMX_VMFUNC = 0x491
> +MSR_IA32_VMX_PROCBASED_CTLS3 = 0x492
>  
>  class msr(object):
>      def __init__(self):
> @@ -71,6 +72,13 @@ class Control(object):
>                  s = 'yes'
>              print('  %-40s %s' % (self.bits[bit], s))
>  
> +# All 64 bits in the tertiary controls MSR are allowed-1
> +class Allowed1Control(Control):
> +    def read2(self, nr):
> +        m = msr()
> +        val = m.read(nr, 0)
> +        return (0, val)
> +
>  class Misc(object):
>      def __init__(self, name, bits, msr):
>          self.name = name
> @@ -135,6 +143,7 @@ controls = [
>              12: 'RDTSC exiting',
>              15: 'CR3-load exiting',
>              16: 'CR3-store exiting',
> +            17: 'Activate tertiary controls',
>              19: 'CR8-load exiting',
>              20: 'CR8-store exiting',
>              21: 'Use TPR shadow',
> @@ -186,6 +195,14 @@ controls = [
>          cap_msr = MSR_IA32_VMX_PROCBASED_CTLS2,
>          ),
>  
> +    Allowed1Control(
> +        name = 'tertiary processor-based controls',
> +        bits = {
> +            4: 'Enable IPI virtualization'
> +            },
> +        cap_msr = MSR_IA32_VMX_PROCBASED_CTLS3,
> +        ),
> +
>      Control(
>          name = 'VM-Exit controls',
>          bits = {

Not sure which particular CPUs are going to implement this (whould be
nice to add this info to the blurb) but this matches Intel doc
(https://software.intel.com/content/www/us/en/develop/download/intel-architecture-instruction-set-extensions-programming-reference.html)
and "IPI virtualization support for VM" series for KVM, so

Reviewed-by: Vitaly Kuznetsov <vkuznets@redhat.com>

-- 
Vitaly