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Description of problem: the default value of init.MaxRxBuffers is 256,set it to 512 or 1024 in device manager,qemu will quit with "qemu-kvm: Guest moved used index from 0 to 257" Version-Release number of selected component (if applicable): qemu-kvm-rhev-2.1.2-12.el7.x86_64 kernel-3.10.0-208.el7.x86_64 virtio-win-1.7.2-2.el6.noarch seabios-1.7.5-5.el7.x86_64 spice-server-0.12.4-8.el7.x86_64 How reproducible: 100% Steps to Reproduce: 1.boot guest with virtio-net-pci: /usr/libexec/qemu-kvm \ -smp 2 -m 2G -cpu host -M pc \ -drive file=/usr/share/virtio-win/virtio-win.iso,media=cdrom,if=none,cache=none,id=drive1 \ -device ide-drive,drive=drive1,bus=ide.0,unit=0,id=cdrom \ -drive file=win8.1-32.qcow2,if=none,cache=none,format=qcow2,id=drive2 \ -device ide-drive,drive=drive2,bus=ide.1,unit=1,id=disk \ -global PIIX4_PM.disable_s3=0 -global PIIX4_PM.disable_s4=0 \ -usb -device usb-tablet \ -spice disable-ticketing,port=5900 -vga qxl -global qxl-vga.revision=3 \ -monitor stdio -qmp tcp:0:4444,server,nowait \ -netdev tap,script=/etc/qemu-ifup,id=hostnet1 -device virtio-net-pci,mq=on,netdev=hostnet1,mac=00:52:54:00:22:88,id=net1 \ 2.change init.MaxRxBuffers value to 512 or 1024 device manager--> Red Hat Virtio Ethernet Adapter--->Advanced---> init.MaxRxBuffers --> input value 512 or 1024 Actual results: qemu quit with "qemu-kvm: Guest moved used index from 0 to 257" Expected results: init.MaxRxBuffers can be changed correctly,guest and host works fine,qemu does not quit. Additional info: 1.win8.1-32/win2012/win2k8-32/win2k8R2 all hit this issue; 2.can reproduce this issue with latest qemu-kvm(qemu-kvm-1.5.3-83.el7.x86_64) 3.can reproduce this issue with rhel7.0 released qemu-kvm(qemu-kvm-1.5.3-60.el7.x86_64) 4.can reproduce this issue on rhel6 host(qemu-kvm-rhev-0.12.1.2-2.444.el6.x86_64) 5.can reproduce this issue with virtio-win-1.6.7-2.el7
I wonder if the bug is in virtio-win, qemu, or both.
modify init.MaxRxBuffers via netsh command does NOT hit this issue,the value can be changed correctly,and guest works fine. netsh command: 1.Registration in NetSH: 1).cmd --> run as administrator 2).cd path-to-the-netkvm-driver 3).rundll32 netkvmco.dll,RegisterNetKVMNetShHelper 2.Get the index of virtio-net-pci:---> usually 0 netsh netkvm show devices 3.Modify NetKVM parameter value netsh netkvm setparam 0 rxcapacity 512/1024
test with virtio-win-prewhql-98,win2k12r2 can not reproduce this issue. package info: virtio-win-prewhql-98 kernel-3.10.0-223.el7.x86_64 qemu-kvm-rhev-2.1.2-20.el7.x86_64 seabios-1.7.5-5.el7.x86_64
I remember win2k12R2 does not hit this issue when do 98-netkvm function test,but this time I reinstall a new guest,still hit this issue. Anyway,update the result here: win8.1-32 and win2012R2 guest CAN hit this issue with build 98 and can NOT reproduce this issue with build100 steps: 1.install a new guest image; 2.install build 98 netkvm driver; 3.change init.MaxRxBuffers value to 512/1024 4.update the netkvm driver with buid 100 5.change init.MaxRxBuffers value to 512/1024 after step3,qemu quit with "qemu-kvm: Guest moved used index from 0 to 257"; after step5,guest works fine,no error
Lijin ,I agree w/ Yan that build98 is based on build80 which only fixed the security issue ,we shouldn't verify the bug on build98 Pls retest it on build100 Thanks, Mike
Moving to verified according to comment#6 .
Since the problem described in this bug report should be resolved in a recent advisory, it has been closed with a resolution of ERRATA. For information on the advisory, and where to find the updated files, follow the link below. If the solution does not work for you, open a new bug report. https://rhn.redhat.com/errata/RHBA-2015-2513.html