This option prevents misbehaviours on guest if a qemu 9pfs export
contains multiple devices, due to the potential file ID collisions
this otherwise may cause.
Signed-off-by: Christian Schoenebeck <qemu_...@crudebyte.com>
---
src/qemu/qemu_command.c | 7 +++
src/qemu/qemu_domain.c | 12 +++++
.../virtio-9p-multidevs.x86_64-latest.args | 45 +++++++++++++++++++
tests/qemuxml2argvtest.c | 2 +
4 files changed, 66 insertions(+)
create mode 100644
tests/qemuxml2argvdata/virtio-9p-multidevs.x86_64-latest.args
diff --git a/src/qemu/qemu_command.c b/src/qemu/qemu_command.c
index d1b689dfd3..5b774973b7 100644
--- a/src/qemu/qemu_command.c
+++ b/src/qemu/qemu_command.c
@@ -2632,6 +2632,13 @@ qemuBuildFSStr(virDomainFSDefPtr fs)
} else if (fs->accessmode == VIR_DOMAIN_FS_ACCESSMODE_SQUASH) {
virBufferAddLit(&opt, ",security_model=none");
}
+ if (fs->multidevs == VIR_DOMAIN_FS_MULTIDEVS_REMAP) {
+ virBufferAddLit(&opt, ",multidevs=remap");
+ } else if (fs->multidevs == VIR_DOMAIN_FS_MULTIDEVS_FORBID) {
+ virBufferAddLit(&opt, ",multidevs=forbid");
+ } else if (fs->multidevs == VIR_DOMAIN_FS_MULTIDEVS_WARN) {
+ virBufferAddLit(&opt, ",multidevs=warn");
+ }
} else if (fs->fsdriver == VIR_DOMAIN_FS_DRIVER_TYPE_HANDLE) {
/* removed since qemu 4.0.0 see v3.1.0-29-g93aee84f57 */
virBufferAddLit(&opt, "handle");
diff --git a/src/qemu/qemu_domain.c b/src/qemu/qemu_domain.c
index adda17a49f..21a01f2908 100644
--- a/src/qemu/qemu_domain.c
+++ b/src/qemu/qemu_domain.c
@@ -8569,6 +8569,13 @@ qemuDomainDeviceDefValidateFS(virDomainFSDefPtr fs,
_("only supports mount filesystem type"));
return -1;
}
+ if (fs->multidevs != VIR_DOMAIN_FS_MODEL_DEFAULT &&
+ !virQEMUCapsGet(qemuCaps, QEMU_CAPS_VIRTFS_MULTIDEVS))
+ {
+ virReportError(VIR_ERR_CONFIG_UNSUPPORTED, "%s",
+ _("multidevs is not supported with this QEMU binary"));
+ return -1;
+ }
switch ((virDomainFSDriverType) fs->fsdriver) {
case VIR_DOMAIN_FS_DRIVER_TYPE_DEFAULT:
@@ -8621,6 +8628,11 @@ qemuDomainDeviceDefValidateFS(virDomainFSDefPtr fs,
_("virtiofs is not supported with this QEMU
binary"));
return -1;
}
+ if (fs->multidevs != VIR_DOMAIN_FS_MULTIDEVS_DEFAULT) {
+ virReportError(VIR_ERR_CONFIG_UNSUPPORTED, "%s",
+ _("virtiofs does not support multidevs"));
+ return -1;
+ }
if (qemuDomainDefValidateVirtioFSSharedMemory(def) < 0)
return -1;
break;
diff --git a/tests/qemuxml2argvdata/virtio-9p-multidevs.x86_64-latest.args
b/tests/qemuxml2argvdata/virtio-9p-multidevs.x86_64-latest.args
new file mode 100644
index 0000000000..5a2e1fafe1
--- /dev/null
+++ b/tests/qemuxml2argvdata/virtio-9p-multidevs.x86_64-latest.args
@@ -0,0 +1,45 @@
+LC_ALL=C \
+PATH=/bin \
+HOME=/tmp/lib/domain--1-QEMUGuest1 \
+USER=test \
+LOGNAME=test \
+XDG_DATA_HOME=/tmp/lib/domain--1-QEMUGuest1/.local/share \
+XDG_CACHE_HOME=/tmp/lib/domain--1-QEMUGuest1/.cache \
+XDG_CONFIG_HOME=/tmp/lib/domain--1-QEMUGuest1/.config \
+QEMU_AUDIO_DRV=none \
+/usr/bin/qemu-system-x86_64 \
+-name guest=QEMUGuest1,debug-threads=on \
+-S \
+-object secret,id=masterKey0,format=raw,\
+file=/tmp/lib/domain--1-QEMUGuest1/master-key.aes \
+-machine pc,accel=tcg,usb=off,dump-guest-core=off \
+-cpu qemu64 \
+-m 214 \
+-overcommit mem-lock=off \
+-smp 1,sockets=1,cores=1,threads=1 \
+-uuid c7a5fdbd-edaf-9455-926a-d65c16db1809 \
+-display none \
+-no-user-config \
+-nodefaults \
+-chardev socket,id=charmonitor,fd=1729,server,nowait \
+-mon chardev=charmonitor,id=monitor,mode=control \
+-rtc base=utc \
+-no-shutdown \
+-no-acpi \
+-boot strict=on \
+-device piix3-usb-uhci,id=usb,bus=pci.0,addr=0x1.0x2 \
+-fsdev local,security_model=mapped,multidevs=remap,id=fsdev-fs0,\
+path=/export/fs0 \
+-device virtio-9p-pci,id=fs0,fsdev=fsdev-fs0,mount_tag=fs0,bus=pci.0,addr=0x2 \
+-fsdev local,security_model=mapped,multidevs=forbid,id=fsdev-fs1,\
+path=/export/fs1 \
+-device virtio-9p-pci,id=fs1,fsdev=fsdev-fs1,mount_tag=fs1,bus=pci.0,addr=0x3 \
+-fsdev local,security_model=mapped,multidevs=warn,id=fsdev-fs2,\
+path=/export/fs2 \
+-device virtio-9p-pci,id=fs2,fsdev=fsdev-fs2,mount_tag=fs2,bus=pci.0,addr=0x4 \
+-chardev pty,id=charserial0 \
+-device isa-serial,chardev=charserial0,id=serial0 \
+-device virtio-balloon-pci,id=balloon0,bus=pci.0,addr=0xc \
+-sandbox on,obsolete=deny,elevateprivileges=deny,spawn=deny,\
+resourcecontrol=deny \
+-msg timestamp=on
diff --git a/tests/qemuxml2argvtest.c b/tests/qemuxml2argvtest.c
index 4d44286b5a..e0fc3ddf67 100644
--- a/tests/qemuxml2argvtest.c
+++ b/tests/qemuxml2argvtest.c
@@ -3122,6 +3122,8 @@ mymain(void)
DO_TEST_CAPS_ARCH_LATEST("x86_64-default-cpu-kvm-q35-4.2", "x86_64");
DO_TEST_CAPS_ARCH_LATEST("x86_64-default-cpu-tcg-q35-4.2", "x86_64");
+ DO_TEST_CAPS_LATEST("virtio-9p-multidevs");
+
if (getenv("LIBVIRT_SKIP_CLEANUP") == NULL)
virFileDeleteTree(fakerootdir);
--
2.20.1
