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Re: [PATCH] KVM: nVMX: VMX instructions: fix segment checks when L1 is in long mode.

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On 18/06/2016 11:01, Quentin Casasnovas wrote:
> Cross-checking the KVM/VMX VMREAD emulation code with the Intel Software
> Developper Manual Volume 3C - "VMREAD - Read Field from Virtual-Machine
> Control Structure", I found that we're enforcing that the destination
> operand is NOT located in a read-only data segment or any code segment when
> the L1 is in long mode - BUT that check should only happen when it is in
> protected mode.
> 
> Shuffling the code a bit to make our emulation follow the specification
> allows me to boot a Xen dom0 in a nested KVM and start HVM L2 guests
> without problems.

That's great, and I'm applying the patch, but it's also pretty weird. :)
 Do you have a pointer to Xen source code that does a VMREAD into a
read-only data segment or a code segment?

Thanks,

Paolo

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[PATCH] KVM: nVMX: VMX instructions: fix segment checks when L1 is in long mode. Quentin Casasnovas <quentin.casasnovas@oracle.com> - 2016-06-18 11:00 +0200
  Re: [PATCH] KVM: nVMX: VMX instructions: fix segment checks when L1  is in long mode. Paolo Bonzini <pbonzini@redhat.com> - 2016-06-23 18:10 +0200
    Re: [PATCH] KVM: nVMX: VMX instructions: fix segment checks when L1  is in long mode. Quentin Casasnovas <quentin.casasnovas@oracle.com> - 2016-06-24 15:10 +0200
      Re: [PATCH] KVM: nVMX: VMX instructions: fix segment checks when L1  is in long mode. Paolo Bonzini <pbonzini@redhat.com> - 2016-06-24 15:20 +0200
        Re: [PATCH] KVM: nVMX: VMX instructions: fix segment checks when L1  is in long mode. Quentin Casasnovas <quentin.casasnovas@oracle.com> - 2016-06-29 19:30 +0200
          Re: [PATCH] KVM: nVMX: VMX instructions: fix segment checks when L1  is in long mode. Paolo Bonzini <pbonzini@redhat.com> - 2016-06-29 22:50 +0200

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