Displaying 15 results from an estimated 15 matches for "hv_rnd".
2014 Sep 19
4
Standardizing an MSR or other hypercall to get an RNG seed?
...;
> Not anywhere close to early enough. We're talking for uses like kASLR.
>
Still to early to do:
h = cpuid(HYPERVIOR_SIGNATURE)
if (h == KVMKVMKVM) {
if (cpuid(kvm_features) & kvm_rnd)
rdmsr(kvm_rnd)
else (h == HyperV) {
if (cpuid(hv_features) & hv_rnd)
rdmsr(hv_rnd)
else (h == XenXenXen) {
if (cpuid(xen_features) & xen_rnd)
rdmsr(xen_rnd)
}
?
--
Gleb.
2014 Sep 19
4
Standardizing an MSR or other hypercall to get an RNG seed?
...;
> Not anywhere close to early enough. We're talking for uses like kASLR.
>
Still to early to do:
h = cpuid(HYPERVIOR_SIGNATURE)
if (h == KVMKVMKVM) {
if (cpuid(kvm_features) & kvm_rnd)
rdmsr(kvm_rnd)
else (h == HyperV) {
if (cpuid(hv_features) & hv_rnd)
rdmsr(hv_rnd)
else (h == XenXenXen) {
if (cpuid(xen_features) & xen_rnd)
rdmsr(xen_rnd)
}
?
--
Gleb.
2014 Sep 19
3
Standardizing an MSR or other hypercall to get an RNG seed?
...>>
> > Still to early to do:
> >
> > h = cpuid(HYPERVIOR_SIGNATURE)
> > if (h == KVMKVMKVM) {
> > if (cpuid(kvm_features) & kvm_rnd)
> > rdmsr(kvm_rnd)
> > else (h == HyperV) {
> > if (cpuid(hv_features) & hv_rnd)
> > rdmsr(hv_rnd)
> > else (h == XenXenXen) {
> > if (cpuid(xen_features) & xen_rnd)
> > rdmsr(xen_rnd)
> > }
> >
>
> If we need to do chase loops, especially not so...
>
What loops exactly? As a non native English spe...
2014 Sep 19
3
Standardizing an MSR or other hypercall to get an RNG seed?
...>>
> > Still to early to do:
> >
> > h = cpuid(HYPERVIOR_SIGNATURE)
> > if (h == KVMKVMKVM) {
> > if (cpuid(kvm_features) & kvm_rnd)
> > rdmsr(kvm_rnd)
> > else (h == HyperV) {
> > if (cpuid(hv_features) & hv_rnd)
> > rdmsr(hv_rnd)
> > else (h == XenXenXen) {
> > if (cpuid(xen_features) & xen_rnd)
> > rdmsr(xen_rnd)
> > }
> >
>
> If we need to do chase loops, especially not so...
>
What loops exactly? As a non native English spe...
2014 Sep 19
2
Standardizing an MSR or other hypercall to get an RNG seed?
...>
> >>> h = cpuid(HYPERVIOR_SIGNATURE)
> >>> if (h == KVMKVMKVM) {
> >>> if (cpuid(kvm_features) & kvm_rnd)
> >>> rdmsr(kvm_rnd)
> >>> else (h == HyperV) {
> >>> if (cpuid(hv_features) & hv_rnd)
> >>> rdmsr(hv_rnd)
> >>> else (h == XenXenXen) {
> >>> if (cpuid(xen_features) & xen_rnd)
> >>> rdmsr(xen_rnd)
> >>> }
> >>>
> >>
> >> If we need to do chase loops, especially...
2014 Sep 19
2
Standardizing an MSR or other hypercall to get an RNG seed?
...>
> >>> h = cpuid(HYPERVIOR_SIGNATURE)
> >>> if (h == KVMKVMKVM) {
> >>> if (cpuid(kvm_features) & kvm_rnd)
> >>> rdmsr(kvm_rnd)
> >>> else (h == HyperV) {
> >>> if (cpuid(hv_features) & hv_rnd)
> >>> rdmsr(hv_rnd)
> >>> else (h == XenXenXen) {
> >>> if (cpuid(xen_features) & xen_rnd)
> >>> rdmsr(xen_rnd)
> >>> }
> >>>
> >>
> >> If we need to do chase loops, especially...
2014 Sep 19
3
Standardizing an MSR or other hypercall to get an RNG seed?
..._SIGNATURE)
> >> >>> if (h == KVMKVMKVM) {
> >> >>> if (cpuid(kvm_features) & kvm_rnd)
> >> >>> rdmsr(kvm_rnd)
> >> >>> else (h == HyperV) {
> >> >>> if (cpuid(hv_features) & hv_rnd)
> >> >>> rdmsr(hv_rnd)
> >> >>> else (h == XenXenXen) {
> >> >>> if (cpuid(xen_features) & xen_rnd)
> >> >>> rdmsr(xen_rnd)
> >> >>> }
> >> >>>
> >> &...
2014 Sep 19
3
Standardizing an MSR or other hypercall to get an RNG seed?
..._SIGNATURE)
> >> >>> if (h == KVMKVMKVM) {
> >> >>> if (cpuid(kvm_features) & kvm_rnd)
> >> >>> rdmsr(kvm_rnd)
> >> >>> else (h == HyperV) {
> >> >>> if (cpuid(hv_features) & hv_rnd)
> >> >>> rdmsr(hv_rnd)
> >> >>> else (h == XenXenXen) {
> >> >>> if (cpuid(xen_features) & xen_rnd)
> >> >>> rdmsr(xen_rnd)
> >> >>> }
> >> >>>
> >> &...
2014 Sep 19
0
Standardizing an MSR or other hypercall to get an RNG seed?
...We're talking for uses like kASLR.
>>
> Still to early to do:
>
> h = cpuid(HYPERVIOR_SIGNATURE)
> if (h == KVMKVMKVM) {
> if (cpuid(kvm_features) & kvm_rnd)
> rdmsr(kvm_rnd)
> else (h == HyperV) {
> if (cpuid(hv_features) & hv_rnd)
> rdmsr(hv_rnd)
> else (h == XenXenXen) {
> if (cpuid(xen_features) & xen_rnd)
> rdmsr(xen_rnd)
> }
>
If we need to do chase loops, especially not so...
-hpa
2014 Sep 19
0
Standardizing an MSR or other hypercall to get an RNG seed?
...Still to early to do:
>>>
>>> h = cpuid(HYPERVIOR_SIGNATURE)
>>> if (h == KVMKVMKVM) {
>>> if (cpuid(kvm_features) & kvm_rnd)
>>> rdmsr(kvm_rnd)
>>> else (h == HyperV) {
>>> if (cpuid(hv_features) & hv_rnd)
>>> rdmsr(hv_rnd)
>>> else (h == XenXenXen) {
>>> if (cpuid(xen_features) & xen_rnd)
>>> rdmsr(xen_rnd)
>>> }
>>>
>>
>> If we need to do chase loops, especially not so...
>>
> What loops exac...
2014 Sep 19
0
Standardizing an MSR or other hypercall to get an RNG seed?
...We're talking for uses like kASLR.
> >
> Still to early to do:
>
> h = cpuid(HYPERVIOR_SIGNATURE)
> if (h == KVMKVMKVM) {
> if (cpuid(kvm_features) & kvm_rnd)
> rdmsr(kvm_rnd)
> else (h == HyperV) {
> if (cpuid(hv_features) & hv_rnd)
> rdmsr(hv_rnd)
> else (h == XenXenXen) {
> if (cpuid(xen_features) & xen_rnd)
> rdmsr(xen_rnd)
> }
>
I think that there's a lot of value in having each guest
implementation be automatically compatible with all hypervisors. For
example, you fo...
2014 Sep 19
2
Standardizing an MSR or other hypercall to get an RNG seed?
On Thu, Sep 18, 2014 at 03:00:05PM -0700, Andy Lutomirski wrote:
> On Thu, Sep 18, 2014 at 2:46 PM, David Hepkin <davidhep at microsoft.com> wrote:
> > I suggest we come to consensus on a specific CPUID leaf where an OS needs to look to determine if a hypervisor supports this capability. We could define a new CPUID leaf range at a well-defined location, or we could just use one of
2014 Sep 19
2
Standardizing an MSR or other hypercall to get an RNG seed?
On Thu, Sep 18, 2014 at 03:00:05PM -0700, Andy Lutomirski wrote:
> On Thu, Sep 18, 2014 at 2:46 PM, David Hepkin <davidhep at microsoft.com> wrote:
> > I suggest we come to consensus on a specific CPUID leaf where an OS needs to look to determine if a hypervisor supports this capability. We could define a new CPUID leaf range at a well-defined location, or we could just use one of
2014 Sep 19
0
Standardizing an MSR or other hypercall to get an RNG seed?
...t; h = cpuid(HYPERVIOR_SIGNATURE)
>> >>> if (h == KVMKVMKVM) {
>> >>> if (cpuid(kvm_features) & kvm_rnd)
>> >>> rdmsr(kvm_rnd)
>> >>> else (h == HyperV) {
>> >>> if (cpuid(hv_features) & hv_rnd)
>> >>> rdmsr(hv_rnd)
>> >>> else (h == XenXenXen) {
>> >>> if (cpuid(xen_features) & xen_rnd)
>> >>> rdmsr(xen_rnd)
>> >>> }
>> >>>
>> >>
>> >> If we nee...
2014 Sep 19
0
Standardizing an MSR or other hypercall to get an RNG seed?
...>> >>> if (h == KVMKVMKVM) {
>> >> >>> if (cpuid(kvm_features) & kvm_rnd)
>> >> >>> rdmsr(kvm_rnd)
>> >> >>> else (h == HyperV) {
>> >> >>> if (cpuid(hv_features) & hv_rnd)
>> >> >>> rdmsr(hv_rnd)
>> >> >>> else (h == XenXenXen) {
>> >> >>> if (cpuid(xen_features) & xen_rnd)
>> >> >>> rdmsr(xen_rnd)
>> >> >>> }
>> >> >...