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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">Do you have more detail info where you actually add trace, and the exact number difference?
<o:p></o:p></span></p>
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<p class="MsoNormal"><a name="_____replyseparator"></a><b><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">From:</span></b><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"> Adel Belkhiri [mailto:adel.belkhiri@gmail.com]
<br>
<b>Sent:</b> Friday, October 27, 2017 7:37 AM<br>
<b>To:</b> Tian, Kevin <kevin.tian@intel.com><br>
<b>Cc:</b> intel-gvt-dev@lists.freedesktop.org<br>
<b>Subject:</b> Re: How gpu requests are trapped by kvmgt ?<o:p></o:p></span></p>
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<p class="MsoNormal" style="margin-bottom:12.0pt">Thank you for your replay,<o:p></o:p></p>
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<p class="MsoNormal">What I wanted to say is that I found that the number of requests sent by the VM to the vgpu is different from the number of requests received by KVMGT. I used Ftrace to do the count. I think the i915 driver of the VM sometimes combine
multiple requests in just one request sent to KVMGT. <br>
<br>
Am I wrong ? <o:p></o:p></p>
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<p class="MsoNormal">Le mer. 25 oct. 2017 à 22:47, Tian, Kevin <<a href="mailto:kevin.tian@intel.com">kevin.tian@intel.com</a>> a écrit :<o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">it’s decided by KVMGT. the real recipe is EPT, which is a CPU hw virtualization feature to decide which
access in VM is trapped or not.</span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"> </span><o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><a name="m_5440476066734605210______replyseparato"></a><b><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">From:</span></b><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">
intel-gvt-dev [mailto:<a href="mailto:intel-gvt-dev-bounces@lists.freedesktop.org" target="_blank">intel-gvt-dev-bounces@lists.freedesktop.org</a>]
<b>On Behalf Of </b>Adel Belkhiri<br>
<b>Sent:</b> Wednesday, October 25, 2017 11:06 PM<br>
<b>To:</b> <a href="mailto:intel-gvt-dev@lists.freedesktop.org" target="_blank">intel-gvt-dev@lists.freedesktop.org</a><br>
<b>Subject:</b> How gpu requests are trapped by kvmgt ?</span><o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;margin-bottom:12.0pt">Hi everybody,<o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;margin-bottom:12.0pt">I have a question about the implementation of KVMGT. According to the documentation, the virtual machine, may send some requests to the gpu directly (Pass-through) and forward some other
requests to the KVMGT module. <br>
<br>
I read the code of KVMGT but i didn't understand how requests are being sent directly to the gpu ? and who decide which request to be directly sent to the gpu or to be trapped by kvmgt ? Is it the graphics card driver of the VM (i915) or KVMGT ?<o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">Thanks a lot for your help.<o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">Yours.<o:p></o:p></p>
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