linux-kernel - Re: [PATCH v5 11/11] KVM: x86: Disable Intel Processor Trace when VMXON in L1 guest

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Date:   Fri, 16 Mar 2018 18:30:40 +0100
From:   Paolo Bonzini <pbonzini@...hat.com>
To:     Luwei Kang <luwei.kang@...el.com>, kvm@...r.kernel.org
Cc:     tglx@...utronix.de, mingo@...hat.com, hpa@...or.com,
        x86@...nel.org, rkrcmar@...hat.com, linux-kernel@...r.kernel.org,
        joro@...tes.org
Subject: Re: [PATCH v5 11/11] KVM: x86: Disable Intel Processor Trace when
 VMXON in L1 guest

On 04/03/2018 13:07, Luwei Kang wrote:
> +	if (pt_mode == PT_MODE_HOST_GUEST) {

This would be vmx_pt_supported(), but I think it's better to remove that
function and just test pt_mode == PT_MODE_HOST_GUEST everywhere (or !=).

Paolo

> +		vmx->pt_desc.guest.ctl = 0;
> +		vmcs_write64(GUEST_IA32_RTIT_CTL, 0);
> +		pt_set_intercept_for_msr(vmx, 1);
> +	}
> +