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List:       qemu-discuss
Subject:    [Qemu-discuss] Enable 64-bit BAR
From:       Greg Santino <gregsantino () yahoo ! com>
Date:       2018-05-20 7:59:30
Message-ID: 1840898675.3266947.1526803170646 () mail ! yahoo ! com
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 Hello,
I have a PCIe card in my hypervisor machine and it is passed through to my VM (both \
VM and hypervisor are running CentOS 7.3 x86_64).   I've installed corresponding \
driver for the PCIe card as well as our software that utilizes the driver.   Our \
software requires the PCIe card to be able to access a 12GB buffer.   We run our \
software and it eventually crashes and causes the server to reboot.   We can only set \
the driver to use 2GB buffers.   Running lspci, the PCIe device uses a 64-bit BAR, \
but it seems like the PCIe controller or OS cannot properly conduct MMIO for address \
ranges above 4GB?   Everything works using 12GB buffer when on bare-metal.   Is there \
a setting in QEMU that can address the issue? I am using qemu-rhev 2.10.0-21 (i've \
tried 2.6 and 2.9 as well)Here is the qemu command I use for my VM.   The PCIe device \
                is the parameter:  -device \
                vfio-pci,host=09:00.0,id=hostdev0,bus=pci.0,addr=0x7
/usr/libexec/qemu-kvm -name guest-myhost-1,debug-threads=on -S -object \
secret,id=masterKey0,format=raw,file=/var/lib/libvirt/qemu/domain-9-myhost-1/master-key.aes \
-machine pc-i440fx-rhel7.0.0,accel=kvm,usb=off,dump-guest-core=off -cpu host -m \
196608 -realtime mlock=off -smp 22,sockets=22,cores=1,threads=1 -uuid \
1f44c0ca-fc67-487e-90c2-a283979e86e8 -no-user-config -nodefaults -chardev \
socket,id=charmonitor,path=/var/lib/libvirt/qemu/domain-9-myhost-1/monitor.sock,server,nowait \
-mon chardev=charmonitor,id=monitor,mode=control -rtc base=utc,driftfix=slew -global \
kvm-pit.lost_tick_policy=delay -no-hpet -no-shutdown -global PIIX4_PM.disable_s3=1 \
-global PIIX4_PM.disable_s4=1 -boot menu=on,strict=on -device \
ich9-usb-uhci2,masterbus-usb.0,firstport=2,bus=pci.0,addr=0x6.0x1 -device \
ich9-usb-uhci3,masterbus-usb=usb.0,firstport=4,bus=pci.0,addr=0x6.0x2 -device \
virtio-serial-pci,id=virtio-serial0,bus=pci.0,addr-0x5 -drive \
file-/var/lib/libvirt/images/vm1/myhost-1-disk0,format=raw,if-none,id=drive-ide0-0-0 \
-device ide-hd,bus=ide.0,unit=0,drive=drive-ide0-0-0,id=ide0-0-0,bootindex=1 -netdev \
tap,fd=30,id=hostnet0,vhost=on,vhostfd=32 -device \
virtio-net-pci,netdev=hostnet0,id=net0,mac=54:e4:76:ff:2f:72,bus=pci.0,addr=0x3 \
-netdev tap,fd=33,host=hostnet1,vhost=on,vhostfd=34 -device \
virtio-net-pci,netdev=hostnet0,id=net1,mac=54:e4:76:ff:2f:84,bus=pci.0,addr=0x4 \
-chardev pty,id=charserial0 -device isa-serial,chardev=charserial0,id=serial0 \
-chardev socket,id=charchannel0,path=/var/lib/libvirt/qemu/channel/target/domain-9-myhost-1/org.qemu.guest_agent.0,server,nowait \
-device virtserialport,bus=virtio-serial0.0,nr=1,chardev=charchannel0,id=channel0,name=org.qemu.guest_agent.0 \
-device usb-tablet,id=input0,bus=usb.0,port=1 -vnc 127.0.0.1:0 -device \
cirrus-vga,id-video0,bus=pci.0,addr=0x2 -device \
vfio-pci,host=09:00.0,id=hostdev0,bus=pci.0,addr=0x7 -device \
virtio-balloon-pci,id=balloon0,bus=pci.0,addr=0x8 -msg timestamp=on

Thank you for your time.


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