Re: Standardizing an MSR or other hypercall to get an RNG seed?

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



On Fri, Sep 19, 2014 at 10:08:20AM -0700, H. Peter Anvin wrote:
> On 09/19/2014 09:53 AM, Gleb Natapov wrote:
> > On Fri, Sep 19, 2014 at 09:40:07AM -0700, H. Peter Anvin wrote:
> >> On 09/19/2014 09:37 AM, Gleb Natapov wrote:
> >>>
> >>> Linux detects what hypervior it runs on very early
> >>
> >> 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)
> >   }
> > 
> 
> If we need to do chase loops, especially not so...
> 
What loops exactly? As a non native English speaker I fail to understand
if your answer is "yes" or "no" ;)

--
			Gleb.
_______________________________________________
Virtualization mailing list
Virtualization@xxxxxxxxxxxxxxxxxxxxxxxxxx
https://lists.linuxfoundation.org/mailman/listinfo/virtualization




[Index of Archives]     [KVM Development]     [Libvirt Development]     [Libvirt Users]     [CentOS Virtualization]     [Netdev]     [Ethernet Bridging]     [Linux Wireless]     [Kernel Newbies]     [Security]     [Linux for Hams]     [Netfilter]     [Bugtraq]     [Yosemite Forum]     [MIPS Linux]     [ARM Linux]     [Linux RAID]     [Linux Admin]     [Samba]

  Powered by Linux