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govmm: add VhostUserFS vhost-user device type #86
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The QEMU vhost-user-fs-pci device provides virtio-fs host<->guest file system sharing (https://virtio-fs.gitlab.io/). The device is instantiated like this: $ qemu -chardev socket,path=/tmp/vhost-fs.sock,id=chr0 -device vhost-user-fs-pci,tag=myfs,chardev=chr0,cache-size=4G,versiontable=/dev/shm/fuse_shared_versions This patch adds the VhostUserFS DeviceDriver and command-line generation for this QEMU device. Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
devimc
approved these changes
Feb 19, 2019
markdryan
approved these changes
Feb 19, 2019
markdryan
reviewed
Feb 20, 2019
| devParams = append(devParams, string(driver)) | ||
| devParams = append(devParams, fmt.Sprintf("chardev=%s", vhostuserDev.CharDevID)) | ||
| devParams = append(devParams, fmt.Sprintf("tag=%s", vhostuserDev.Tag)) | ||
| devParams = append(devParams, fmt.Sprintf("cache-size=%dG", vhostuserDev.CacheSize)) |
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coveralls seems to be working again, but actually I do have a question. Is 0 a valid value for vhostuserDev.CacheSize? I ask as we don't check this value in the Valid method, which led me to wonder whether cache-size=0G was a valid option.
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On Wed, Feb 20, 2019 at 8:32 AM Mark Ryan ***@***.***> wrote:
***@***.**** commented on this pull request.
------------------------------
In qemu/qemu.go
<#86 (comment)>:
> @@ -809,6 +819,15 @@ func (vhostuserDev VhostUserDevice) QemuParams(config *Config) []string {
devParams = append(devParams, "logical_block_size=4096")
devParams = append(devParams, "size=512M")
devParams = append(devParams, fmt.Sprintf("chardev=%s", vhostuserDev.CharDevID))
+ case VhostUserFS:
+ driver = VhostUserFS
+ devParams = append(devParams, string(driver))
+ devParams = append(devParams, fmt.Sprintf("chardev=%s", vhostuserDev.CharDevID))
+ devParams = append(devParams, fmt.Sprintf("tag=%s", vhostuserDev.Tag))
+ devParams = append(devParams, fmt.Sprintf("cache-size=%dG", vhostuserDev.CacheSize))
coveralls seems to be working again, but actually I do have a question. Is
0 a valid value for vhostuserDev.CacheSize? I ask as we don't check this
value in the Valid method, which led me to wonder whether cache-size=0G was
a valid option.
QEMU currently prints an error for cache-size=0G but that will change
soon. cache-size=0G will disable the DAX feature on the QEMU side.
Probably best not to check vhostuserDev.CacheSize in Kata.
|
Okay, sounds good. |
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The QEMU vhost-user-fs-pci device provides virtio-fs host<->guest file
system sharing (https://virtio-fs.gitlab.io/). The device is
instantiated like this:
$ qemu -chardev socket,path=/tmp/vhost-fs.sock,id=chr0
-device vhost-user-fs-pci,tag=myfs,chardev=chr0,cache-size=4G,versiontable=/dev/shm/fuse_shared_versions
This patch adds the VhostUserFS DeviceDriver and command-line generation
for this QEMU device.
Signed-off-by: Stefan Hajnoczi stefanha@redhat.com
Note that vhost-user-fs-pci is not yet available in qemu.git/master so it may be desirable to leave this pull request as "work in progress" until upstream QEMU merges the feature. This govmm patch is a prerequisite for Kata Containers virtio-fs support.