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<p class="MsoNormal">Hi,<o:p></o:p></p>
<p class="MsoNormal"> We have been observing an issue that IO BARs can’t be claimed due to resource<o:p></o:p></p>
<p class="MsoNormal">conflict.<br>
<br>
<o:p></o:p></p>
<p class="MsoNormal" style="background:#F4F5F7"><span style="font-size:9.0pt;font-family:"Courier New";color:#172B4D">[ 0.457693] pci 0000:00:1d.0: can't claim BAR 4 [io 0x92a0-0x92bf]: address conflict with PCI Bus 0000:01 [io 0x9000-0x9fff]<o:p></o:p></span></p>
<p class="MsoNormal" style="background:#F4F5F7"><span style="font-size:9.0pt;font-family:"Courier New";color:#172B4D">[ 0.457705] pci 0000:00:1d.1: can't claim BAR 4 [io 0x9280-0x929f]: address conflict with PCI Bus 0000:01 [io 0x9000-0x9fff]<o:p></o:p></span></p>
<p class="MsoNormal" style="background:#F4F5F7"><span style="font-size:9.0pt;font-family:"Courier New";color:#172B4D">[ 0.457715] pci 0000:00:1d.2: can't claim BAR 4 [io 0x9260-0x927f]: address conflict with PCI Bus 0000:01 [io 0x9000-0x9fff]<o:p></o:p></span></p>
<p class="MsoNormal" style="background:#F4F5F7"><span style="font-size:9.0pt;font-family:"Courier New";color:#172B4D">[ 0.457743] pci 0000:00:1f.2: can't claim BAR 4 [io 0x9240-0x925f]: address conflict with PCI Bus 0000:01 [io 0x9000-0x9fff]<o:p></o:p></span></p>
<p class="MsoNormal" style="background:#F4F5F7"><span style="font-size:9.0pt;font-family:"Courier New";color:#172B4D">[ 0.457754] pci 0000:00:1f.3: can't claim BAR 4 [io 0x9200-0x923f]: address conflict with PCI Bus 0000:01 [io 0x9000-0x9fff]<o:p></o:p></span></p>
<p class="MsoNormal"><br>
<br>
<o:p></o:p></p>
<p class="MsoNormal">Please see the discussion thread:<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><a href="https://www.spinics.net/lists/linux-pci/msg133740.html">https://www.spinics.net/lists/linux-pci/msg133740.html</a><o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">The root of the problem is that OVMF does not take into account the limit register’s granularity (limit) of a bridge,<o:p></o:p></p>
<p class="MsoNormal">and programs EPs with overlapping IO ranges in a different bus.<o:p></o:p></p>
<p class="MsoNormal"><br>
Should we fix the issue in the OVMF?<br>
<br>
<o:p></o:p></p>
<p class="MsoNormal">Thanks,<o:p></o:p></p>
<p class="MsoNormal">Kallol<o:p></o:p></p>
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