20110522kernelvm xen+virtio

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• •  o •  o  o •  o  virtio: Linux I/O http://www.ibm.com/developerworks/jp/linux/library/l-virtio/

• •  o  o  IRQ MSI(-X) Xen - eventchannel KVM -

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While tracing virtio-blk crash issues, I have foundcpu_physical_memory_map() in upstream-qemu+xen behavesdifferent with others. This prevents proper work of virtio-ring bundledin qemu.When a caller requests more than 2 guest-physical pages, the functionwill map the pages in host-virtual, as possible. In kvm+qemu, theregion residents always sequential in host-virtual, so it will workperfectly. However, in xen+qemu, the region mapping is sometimesfragmented and partial. ( )

Citrix This is a very serious issue, thank you very much for spotting it! I am going to refactor cpu_physical_memory_map to fix the problem, I‘ll send you a patch as soon as I have it ready.• • 

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20110522kernelvm xen+virtio

by Takeshi Hasegawa on May 22, 2011

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20110522kernelvm xen+virtio — Presentation Transcript

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