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Re: [PATCH 0/3] Infinite loops in microcode while running guests

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On 11/11/2015 13:47, Austin S Hemmelgarn wrote:
>>
> I just finished running a couple of tests in a KVM instance running
> nested on a Xen HVM instance, and found no issues, so for the set as a
> whole:
> 
> Tested-by: Austin S. Hemmelgarn <ahferroin7@gmail.com>
> 
> Now to hope the equivalent fix for Xen gets into the Gentoo repositories
> soon, as the issue propagates down through nested virtualization and
> ties up the CPU regardless (and in turn triggers the watchdog).

Note that nested guests should _not_ lock up the outer (L0) hypervisor
if the outer hypervisor has the fix.  At least this is the case for KVM:
a fixed outer KVM can protect any vulnerable nested (L1) hypervisor from
malicious nested guests.  A vulnerable outer KVM is also protected if
the nested hypervisor has the workaround.

Paolo
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Thread

[PATCH 0/3] Infinite loops in microcode while running guests Paolo Bonzini <pbonzini@redhat.com> - 2015-11-10 13:30 +0100
  Re: [PATCH 0/3] Infinite loops in microcode while running guests Jan Kiszka <jan.kiszka@siemens.com> - 2015-11-10 16:40 +0100
    Re: [PATCH 0/3] Infinite loops in microcode while running guests Paolo Bonzini <pbonzini@redhat.com> - 2015-11-10 17:20 +0100
  Re: [PATCH 0/3] Infinite loops in microcode while running guests Austin S Hemmelgarn <ahferroin7@gmail.com> - 2015-11-11 13:50 +0100
    Re: [PATCH 0/3] Infinite loops in microcode while running guests Paolo Bonzini <pbonzini@redhat.com> - 2015-11-11 14:10 +0100
      Re: [PATCH 0/3] Infinite loops in microcode while running guests Austin S Hemmelgarn <ahferroin7@gmail.com> - 2015-11-11 14:20 +0100
        Re: [PATCH 0/3] Infinite loops in microcode while running guests Jan Kiszka <jan.kiszka@siemens.com> - 2015-11-12 15:10 +0100
          Re: [PATCH 0/3] Infinite loops in microcode while running guests Paolo Bonzini <pbonzini@redhat.com> - 2015-11-12 15:40 +0100

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