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Re: File sharing over virtio-9p
On Tue, May 21, 2019 at 1:39 PM Ryota Ozaki <ozaki-r%netbsd.org@localhost> wrote:
> The following two patches enables a NetBSD guest running
> on a Linux KVM to share files with its host over virtio-9p.
> The first patch exports a 9p endpoint of virtio-9p via a character
> device (e.g., /dev/vio9p0) and the second one extends mount_9p
> (puffs) to talk with a 9p server inside qemu via the character device.
> Export a directory of a host via virtio-9p. The below XML is part of
> a libvirt domain configuration. It exports "/var/lib/libvirt/export"
> directory with a tag "test". If it is the first entry, it will have
> minor number 0 and /dev/vio9p0 is assigned to it typically.
> <filesystem type='mount' accessmode='mapped'>
> <source dir='/var/lib/libvirt/export'/>
> <target dir='test'/>
> <address type='pci' domain='0x0000' bus='0x00' slot='0x03'
> A boot log of vio9p looks like this:
> virtio0 at pci0 dev 3 function 0
> virtio0: Virtio 9P Transport Device (rev. 0x00)
> vio9p0 at virtio0: Features: 0x10000000<INDIRECT_DESC>
> virtio0: allocated 12288 byte for virtqueue 0 for vio9p, size 128
> virtio0: using 4096 byte (256 entries) indirect descriptors
> vio9p0: tagged as test
> virtio0: interrupting at ioapic0 pin 11
> A NetBSD guest can mount the exported directory with mount_9p.
> mount_9p -cu /dev/vio9p0 /mnt/9p
> -c tells mount_9p to interpret the first argument as a character
> device file to talk with.
> Have fun,
I've prepared complete patches ready to commit:
I would like to commit them in several days if there is
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