https://bugzilla.kernel.org/show_bug.cgi?id=43339
Summary: Wrong Pci-Bridge Header Type check.
Product: Virtualization
Version: unspecified
Kernel Version: 3.4
Platform: All
OS/Version: Linux
Tree: Mainline
Status: NEW
Severity: normal
Priority: P1
Component: kvm
AssignedTo: [email protected]
ReportedBy: [email protected]
Regression: No
I have found bug in file virt/kvm/assigned-device.c
670 /* Don't allow bridges to be assigned */
671 pci_read_config_byte(dev, PCI_HEADER_TYPE, &header_type);
672 if ((header_type & PCI_HEADER_TYPE) != PCI_HEADER_TYPE_NORMAL) {
673 r = -EPERM;
674 goto out_put;
675 }
This code doesn't check that device is PCI-Bridge. In my case
header_type is 1, default value for PCI-Bridge
PCI_HEADER_TYPE is 14(0xE)
PCI_HEADER_TYPE_NORMAL is 0
So, 1 & 0xE == 0 thus KVM assigns pci-bridge device to VM successfully.
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