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18c24bc686
Commit10c73bf1fixed a bug that I had introduced back in commit70249927- if a vhost-scsi device had no manually assigned PCI address, one wouldn't be assigned automatically. There was a slight problem with the logic of the fix though - in the case of domains with pcie-root (e.g. those with a q35 machinetype), qemuDomainDeviceCalculatePCIConnectFlags() will attempt to determine if the host-side PCI device is Express or legacy by examining sysfs based on the host-side PCI address stored in hostdev->source.subsys.u.pci.addr, but that part of the union is only valid for PCI hostdevs, *not* for SCSI hostdevs. So we end up trying to read sysfs for some probably-non-existent device, which fails, and the function virPCIDeviceIsPCIExpress() returns failure (-1). By coincidence, the return value is being examined as a boolean, and since -1 is true, we still end up assigning the vhost-scsi device to an Express slot, but that is just by chance (and could fail in the case that the gibberish in the "hostside PCI address" was the address of a real device that happened to be legacy PCI). Since (according to Paolo Bonzini) vhost-scsi devices appear just like virtio-scsi devices in the guest, they should follow the same rules as virtio devices when deciding whether they should be placed in an Express or a legacy slot. That's accomplished in this patch by returning early with virtioFlags, rather than erroneously using hostdev->source.subsys.u.pci.addr. It also adds a test case for PCIe to assure it doesn't get broken in the future.
24 lines
747 B
XML
24 lines
747 B
XML
<domain type='kvm'>
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<name>QEMUGuest2</name>
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<uuid>c7a5fdbd-edaf-9466-926a-d65c16db1809</uuid>
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<memory unit='KiB'>219100</memory>
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<currentMemory unit='KiB'>219100</currentMemory>
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<vcpu placement='static'>1</vcpu>
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<os>
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<type arch='x86_64' machine='pc-q35-2.7'>hvm</type>
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<boot dev='hd'/>
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</os>
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<clock offset='utc'/>
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<on_poweroff>destroy</on_poweroff>
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<on_reboot>restart</on_reboot>
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<on_crash>destroy</on_crash>
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<devices>
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<emulator>/usr/bin/qemu-system-x86_64</emulator>
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<controller type='usb' index='0' model='none'/>
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<hostdev mode='subsystem' type='scsi_host' managed='no'>
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<source protocol='vhost' wwpn='naa.5123456789abcde0'/>
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</hostdev>
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<memballoon model='none'/>
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</devices>
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</domain>
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