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Subject: Re: [PATCH v9 09/12] KVM: x86: Introduce a function to initialize the
 PT configuration
To:     "Kang, Luwei" <luwei.kang@intel.com>,
        Alexander Shishkin <alexander.shishkin@linux.intel.com>
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From:   Paolo Bonzini <pbonzini@redhat.com>
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Date:   Mon, 11 Jun 2018 13:41:53 +0200
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On 08/06/2018 16:56, Kang, Luwei wrote:
>>> +	/* Initialize and clear the no dependency bits */
>>> +	vmx->pt_desc.ctl_bitmask = ~0ULL;
>> This looks redundant, doesn't it?
> This is a bit mask for RTIT_CTL MSR and it will make & with the value of RTIT_CLT from guest.
> The reserved bits will be 1 in this bit mask and the setable  bits are 0.
> 
>>> +	vmx->pt_desc.ctl_bitmask = ~(RTIT_CTL_TRACEEN | RTIT_CTL_OS |
>>> +			RTIT_CTL_USR | RTIT_CTL_TSC_EN |
>> RTIT_CTL_DISRETC);

But it's set twice, so the first assignment is superfluous.

Paolo