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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.
26 lines
711 B
Plaintext
26 lines
711 B
Plaintext
LC_ALL=C \
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PATH=/bin \
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HOME=/home/test \
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USER=test \
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LOGNAME=test \
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QEMU_AUDIO_DRV=none \
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/usr/bin/qemu-system-x86_64 \
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-name QEMUGuest2 \
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-S \
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-M pc-q35-2.7 \
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-m 214 \
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-smp 1,sockets=1,cores=1,threads=1 \
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-uuid c7a5fdbd-edaf-9466-926a-d65c16db1809 \
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-nographic \
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-nodefaults \
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-chardev socket,id=charmonitor,path=/tmp/lib/domain--1-QEMUGuest2/monitor.sock,\
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server,nowait \
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-mon chardev=charmonitor,id=monitor,mode=readline \
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-no-acpi \
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-boot c \
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-device pcie-root-port,port=0x10,chassis=1,id=pci.1,bus=pcie.0,\
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multifunction=on,addr=0x2 \
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-device pcie-root-port,port=0x11,chassis=2,id=pci.2,bus=pcie.0,addr=0x2.0x1 \
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-device vhost-scsi-pci,wwpn=naa.5123456789abcde0,vhostfd=3,id=hostdev0,\
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bus=pci.1,addr=0x0
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