Error Doing PCI Passthrough On CentOS 7.2

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Hi all,

I am trying to configure a kvm guest using pci passthrough to pass it a wireless pci adapter (host is my personal laptop). But when I try to start it:

error: Failed to start domain obsdfw error: unsupported configuration: host doesn’t support passthrough of host PCI devices

PCI passthrough is enabled:

[ 0.000000] Command line: BOOT_IMAGE=/vmlinuz-3.10.0-327.28.3.el7.x86_64 root=UUIDH220e4e-228c-42d9-a0af-482c2fc7c008 ro crashkernel=auto rhgb quiet intel_iommu=on
[ 0.000000] Kernel command line: BOOT_IMAGE=/vmlinuz-3.10.0-327.28.3.el7.x86_64 root=UUIDH220e4e-228c-42d9-a0af-482c2fc7c008 ro crashkernel=auto rhgb quiet intel_iommu=on

And supported according dmesg output:

root@lapdev01# dmesg | grep IOM
[ 0.000000] Intel-IOMMU: enabled

As you can see in the following output, VT-d extensions are supported also:

root@lapdev01:~# cat /proc/cpuinfo | grep vmx flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe syscall nx pdpe1gb rdtscp lm constant_tsc arch_perfmon pebs bts rep_good nopl xtopology nonstop_tsc aperfmperf eagerfpu pni pclmulqdq dtes64 monitor ds_cpl vmx est tm2 ssse3 fma cx16 xtpr pdcm pcid sse4_1 sse4_2 movbe popcnt tsc_deadline_timer aes xsave avx f16c rdrand lahf_lm abm ida arat epb pln pts dtherm tpr_shadow vnmi flexpriority ept vpid fsgsbase tsc_adjust bmi1 avx2 smep bmi2 erms invpcid xsaveopt flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe syscall nx pdpe1gb rdtscp lm constant_tsc arch_perfmon pebs bts rep_good nopl xtopology nonstop_tsc aperfmperf eagerfpu pni pclmulqdq dtes64 monitor ds_cpl vmx est tm2 ssse3 fma cx16 xtpr pdcm pcid sse4_1 sse4_2 movbe popcnt tsc_deadline_timer aes xsave avx f16c rdrand lahf_lm abm ida arat epb pln pts dtherm tpr_shadow vnmi flexpriority ept vpid fsgsbase tsc_adjust bmi1 avx2 smep bmi2 erms invpcid xsaveopt flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe syscall nx pdpe1gb rdtscp lm constant_tsc arch_perfmon pebs bts rep_good nopl xtopology nonstop_tsc aperfmperf eagerfpu pni pclmulqdq dtes64 monitor ds_cpl vmx est tm2 ssse3 fma cx16 xtpr pdcm pcid sse4_1 sse4_2 movbe popcnt tsc_deadline_timer aes xsave avx f16c rdrand lahf_lm abm ida arat epb pln pts dtherm tpr_shadow vnmi flexpriority ept vpid fsgsbase tsc_adjust bmi1 avx2 smep bmi2 erms invpcid xsaveopt flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe syscall nx pdpe1gb rdtscp lm constant_tsc arch_perfmon pebs bts rep_good nopl xtopology nonstop_tsc aperfmperf eagerfpu pni pclmulqdq dtes64 monitor ds_cpl vmx est tm2 ssse3 fma cx16 xtpr pdcm pcid sse4_1 sse4_2 movbe popcnt tsc_deadline_timer aes xsave avx f16c rdrand lahf_lm abm ida arat epb pln pts dtherm tpr_shadow vnmi flexpriority ept vpid fsgsbase tsc_adjust bmi1 avx2 smep bmi2 erms invpcid xsaveopt

CPU is a Intel(R) Core(TM) i5-4200U CPU @ 1.60GHz (fam: 06, model: 45, stepping: 01), Westmere.

Then, where is the problem?? I don’t understand what I am doing wrong. CentOS is 7.2 release fully patched using qemu package from virt repo:

qemu-kvm-ev-2.3.0-31.el7.16.1.x86_64
qemu-kvm-common-ev-2.3.0-31.el7.16.1.x86_64
qemu-img-ev-2.3.0-31.el7.16.1.x86_64

Thanks.

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