Re: [Xen-devel] [PATCH v2 09/10] x86: Disable Intel Processor Trace when VMXON in L1 guest

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 30.05.18 at 15:28, <luwei.kang@xxxxxxxxx> wrote:
> @@ -1519,6 +1520,14 @@ int nvmx_handle_vmxon(struct cpu_user_regs *regs)
>      v->arch.hvm_vmx.launched = 0;
>      vmsucceed(regs);
>  
> +    if ( v->arch.hvm_vmx.ipt_desc )
> +    {
> +        v->arch.hvm_vmx.ipt_desc->ipt_guest.ctl = 0;
> +        vmx_vmcs_enter(current);
> +        __vmwrite(GUEST_IA32_RTIT_CTL, 0);
> +        vmx_vmcs_exit(current);
> +    }

I again don't understand why enter and exit the VMCS here.

Jan



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