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<div>Hi All,</div>
<div> <strong>Setup:</strong></div>
<div> - x86 based platforms, running Yocto-Linux with QEMU/KVM to launch our FreeBSD VM's</div>
<div> </div>
<div> <strong>Issue in brief:</strong></div>
<div> I’m encountering an issue in one of our platforms, while accessing the SMBIOSTable with SMP Enabled 64-bit FreeBSD kernel</div>
<div> </div>
<div> - This issue is NOT observed on all our platforms.</div>
<div> - just seeing it on a specific platform, which has changes to the HostOS BIOS</div>
<div> </div>
<div> The FreeBSD VM's access the SMBIOS table, where the smbios is shared to the VM using</div>
<div> <em><strong><smbios mode='host'/></strong></em></div>
<div> </div>
<div> While enabling SMP on 64-bit FreeBSD Kernel, I see that the SMBIOSTable is accessed at <strong>different location</strong> compared to the address shared when <strong>SMP is disabled.</strong></div>
<div> </div>
<div> <strong>=== with 1 vCPU to FreeBSD (No SMP) ====</strong></div>
<div>addr found @ 0x800f0c20</div>
<div> SMBIOS map : 800f0c40 f0c40 kva 0 > 140 {800f0c40, f0c40 <----> virtual address(va), physical address(pa) }</div>
<div> SMBIOS map 800f0c40 f0c40 page num 0 140</div>
<div> SMBIOS mapped 800f0c40 f0c40 0xffff807fffc00780</div>
<div>Found SMBIOS Ver 2.8 at 0xffffffff800f0c40 - Beyond mapped region</div>
<div>smbios: Found SMBIOS Ver 2.8 at 0xffffffff800f0c20</div>
<div>smbios: Table at 0xffffffff800f0c40 len 568</div>
<div>Fast boot:0</div>
<div> </div>
<div> <strong>=== with 2 vCPU to FreeBSD (SMP enabled) ====</strong></div>
<div> addr found @ 0x800f0e40</div>
<div>SMBIOS map : fa1ffd80 7a1ffd80 kva 3d0 > 140 {fa1ffd80, 7a1ffd80 <----> va, pa }</div>
<div>Found SMBIOS Ver 2.8 at 0xfffffffffa1ffd80 - Beyond mapped region</div>
<div>Fast boot:0</div>
<div>kernel trap 12 with interrupts disabled è PANIC PANIC PANIC</div>
<div> </div>
<div> </div>
<div><strong> Questions & Resolutions:</strong></div>
<div> The following are couple of questions:</div>
<div>1. why is that the SMBIOSTable gets mapped at different addresses when launching the VM with and without SMP (SMP with 2 vCPUs</div>
<div>2. Is there a way to PIN the SMBIOSTable for the VM ? This probably will help address the issue</div>
<div>3. The issue is seen only with a specific platform. While, SMP in 64-bit OCCAM works fine on <strong>many other platforms. </strong>Does it mean, it is an issue specific to the bios release for Porter?</div>
<div>4 .I could address the issue by using</div>
<div><strong><em> <smbios mode='sysinfo'/></em></strong></div>
<ol>
</ol>
<div> please suggest ways to identify the problem and any potential solutions</div>
<div> </div>
<div>thanks in advance & rgds,</div>
<div>Sundareswaram</div>
<div> </div>
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