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authorChristian Krinitsin <mail@krinitsin.com>2025-07-03 07:27:52 +0000
committerChristian Krinitsin <mail@krinitsin.com>2025-07-03 07:27:52 +0000
commitd0c85e36e4de67af628d54e9ab577cc3fad7796a (patch)
treef8f784b0f04343b90516a338d6df81df3a85dfa2 /results/classifier/gemma3:12b/kvm/1921444
parent7f4364274750eb8cb39a3e7493132fca1c01232e (diff)
downloademulator-bug-study-d0c85e36e4de67af628d54e9ab577cc3fad7796a.tar.gz
emulator-bug-study-d0c85e36e4de67af628d54e9ab577cc3fad7796a.zip
add deepseek and gemma results
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+
+Q35 doesn't support to hot add the 2nd PCIe device to KVM guest
+
+KVM: https://git.kernel.org/pub/scm/virt/kvm/kvm.git  branch: next, commit: 4a98623d
+Qemu: https://git.qemu.org/git/qemu.git  branch: master, commit: 9e2e9fe3
+
+Created a KVM guest with Q35 chipset, and try to hot add 2 PCIe device to guest with qemu internal command device_add, the 1st device can be added successfully, but the 2nd device failed to hot add.
+
+If guest chipset is legacy i440fx, the 2 device can be added successfully.
+
+1. Enable VT-d in BIOS
+2. load KVM modules in Linux OS: modprobe kvm; modprobe kvm_intel
+3. Bind 2 device to vfio-pci
+    echo 0000:b1:00.0 > /sys/bus/pci/drivers/i40e/unbind
+    echo "8086 1572" > /sys/bus/pci/drivers/vfio-pci/new_id 
+    echo 0000:b1:00.1 > /sys/bus/pci/drivers/i40e/unbind
+    echo "8086 1572" > /sys/bus/pci/drivers/vfio-pci/new_id 
+
+4. create guest with Q35 chipset:
+qemu-system-x86_64 --accel kvm -m 4096 -smp 4 -drive file=/home/rhel8.2.qcow2,if=none,id=virtio-disk0 -device virtio-blk-pci,drive=virtio-disk0 -cpu host -machine q35 -device pcie-root-port,id=root1 -daemonize
+
+5. hot add the 1st device to guest successfully
+in guest qemu monitor "device_add vfio-pci,host=b1:00.0,id=nic0,bus=root1"
+6. hot add the 2nd device to guest
+in guest qemu monitor "device_add vfio-pci,host=b1:00.1,id=nic1,bus=root1"
+The 2nd device doesn't be added in guest, and the 1st device is removed from guest. 
+
+Guest partial log:
+[  110.452272] pcieport 0000:00:04.0: pciehp: Slot(0): Attention button pressed
+[  110.453314] pcieport 0000:00:04.0: pciehp: Slot(0) Powering on due to button press
+[  110.454156] pcieport 0000:00:04.0: pciehp: Slot(0): Card present
+[  110.454792] pcieport 0000:00:04.0: pciehp: Slot(0): Link Up
+[  110.580927] pci 0000:01:00.0: [8086:1572] type 00 class 0x020000
+[  110.582560] pci 0000:01:00.0: reg 0x10: [mem 0x00000000-0x007fffff 64bit pref]
+[  110.583453] pci 0000:01:00.0: reg 0x1c: [mem 0x00000000-0x00007fff 64bit pref]
+[  110.584278] pci 0000:01:00.0: reg 0x30: [mem 0x00000000-0x0007ffff pref]
+[  110.585051] pci 0000:01:00.0: Max Payload Size set to 128 (was 512, max 2048)
+[  110.586621] pci 0000:01:00.0: PME# supported from D0 D3hot D3cold
+[  110.588140] pci 0000:01:00.0: BAR 0: no space for [mem size 0x00800000 64bit pref]
+[  110.588954] pci 0000:01:00.0: BAR 0: failed to assign [mem size 0x00800000 64bit pref]
+[  110.589797] pci 0000:01:00.0: BAR 6: assigned [mem 0xfe800000-0xfe87ffff pref]
+[  110.590703] pci 0000:01:00.0: BAR 3: assigned [mem 0xfe000000-0xfe007fff 64bit pref]
+[  110.592085] pcieport 0000:00:04.0: PCI bridge to [bus 01]
+[  110.592755] pcieport 0000:00:04.0:   bridge window [io  0x1000-0x1fff]
+[  110.594403] pcieport 0000:00:04.0:   bridge window [mem 0xfe800000-0xfe9fffff]
+[  110.595847] pcieport 0000:00:04.0:   bridge window [mem 0xfe000000-0xfe1fffff 64bit pref]
+[  110.597867] PCI: No. 2 try to assign unassigned res
+[  110.597870] release child resource [mem 0xfe000000-0xfe007fff 64bit pref]
+[  110.597871] pcieport 0000:00:04.0: resource 15 [mem 0xfe000000-0xfe1fffff 64bit pref] released
+[  110.598881] pcieport 0000:00:04.0: PCI bridge to [bus 01]
+[  110.600789] pcieport 0000:00:04.0: BAR 15: assigned [mem 0x180000000-0x180bfffff 64bit pref]
+[  110.601731] pci 0000:01:00.0: BAR 0: assigned [mem 0x180000000-0x1807fffff 64bit pref]
+[  110.602849] pci 0000:01:00.0: BAR 3: assigned [mem 0x180800000-0x180807fff 64bit pref]
+[  110.604069] pcieport 0000:00:04.0: PCI bridge to [bus 01]
+[  110.604941] pcieport 0000:00:04.0:   bridge window [io  0x1000-0x1fff]
+[  110.606237] pcieport 0000:00:04.0:   bridge window [mem 0xfe800000-0xfe9fffff]
+[  110.607401] pcieport 0000:00:04.0:   bridge window [mem 0x180000000-0x180bfffff 64bit pref]
+[  110.653661] i40e: Intel(R) Ethernet Connection XL710 Network Driver
+[  110.654443] i40e: Copyright (c) 2013 - 2019 Intel Corporation.
+[  110.655314] i40e 0000:01:00.0: enabling device (0140 -> 0142)
+[  110.672396] i40e 0000:01:00.0: fw 6.0.48442 api 1.7 nvm 6.01 0x800035b1 1.1747.0 [8086:1572] [8086:0008]
+[  110.750054] i40e 0000:01:00.0: MAC address: 3c:fd:fe:c0:59:98
+[  110.751792] i40e 0000:01:00.0: FW LLDP is enabled
+[  110.764644] i40e 0000:01:00.0 eth1: NIC Link is Up, 10 Gbps Full Duplex, Flow Control: None
+[  110.779390] i40e 0000:01:00.0: PCI-Express: Speed 8.0GT/s Width x8
+[  110.789841] i40e 0000:01:00.0: Features: PF-id[0] VFs: 64 VSIs: 66 QP: 4 RSS FD_ATR FD_SB NTUPLE DCB VxLAN Geneve PTP VEPA
+[  111.817553] IPv6: ADDRCONF(NETDEV_CHANGE): eth1: link becomes ready
+[  205.130288] pcieport 0000:00:04.0: pciehp: Slot(0): Attention button pressed
+[  205.131743] pcieport 0000:00:04.0: pciehp: Slot(0): Powering off due to button press
+[  205.133233] pcieport 0000:00:04.0: pciehp: Slot(0): Card not present
+[  205.135728] i40e 0000:01:00.0: i40e_ptp_stop: removed PHC on eth1
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