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govmm: add VhostUserFS vhost-user device type

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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>
This commit is contained in:
Stefan Hajnoczi
2018-07-05 16:04:31 +01:00
committed by Stefan Hajnoczi
parent 78d079db6d
commit 3c84b1daa3
1 changed files with 24 additions and 5 deletions
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19
qemu/qemu.go
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@@ -92,6 +92,9 @@ const (
//VhostUserBlk represents a block vhostuser device type.
VhostUserBlk DeviceDriver = "vhost-user-blk-pci"
//VhostUserFS represents a virtio-fs vhostuser device type
VhostUserFS DeviceDriver = "vhost-user-fs-pci"
// PCIBridgeDriver represents a PCI bridge device type.
PCIBridgeDriver DeviceDriver = "pci-bridge"
@@ -744,6 +747,9 @@ type VhostUserDevice struct {
CharDevID string
TypeDevID string //variable QEMU parameter based on value of VhostUserType
Address string //used for MAC address in net case
Tag string //virtio-fs volume id for mounting inside guest
CacheSize uint32 //virtio-fs DAX cache size in GiB
SharedVersions bool //enable virtio-fs shared version metadata
VhostUserType DeviceDriver
// ROMFile specifies the ROM file being used for this device.
@@ -767,6 +773,10 @@ func (vhostuserDev VhostUserDevice) Valid() bool {
return false
}
case VhostUserBlk:
case VhostUserFS:
if vhostuserDev.Tag == "" {
return false
}
default:
return false
}
@@ -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))
if vhostuserDev.SharedVersions {
devParams = append(devParams, "versiontable=/dev/shm/fuse_shared_versions")
}
default:
return nil
}