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RHEL7 qemu-kvm compiled out virtio-9pfs, so we should disable it if using RHEL7 qemu-kvm. dgilbert hit something similar last week, and we already have a user mentioning it on virt@fedora so it will likely be a common complaint:

https://lists.fedoraproject.org/pipermail/virt/2014-March/004003.html

Should be as simple as:

diff --git a/virtManager/addhardware.py b/virtManager/addhardware.py
index 1e91505..4bd776c 100644
--- a/virtManager/addhardware.py
+++ b/virtManager/addhardware.py
@@ -370,7 +370,8 @@ class vmmAddHardware(vmmGObjectUI):
                       _("Not supported for this guest type."))
         add_hw_option("Filesystem", Gtk.STOCK_DIRECTORY, PAGE_FILESYSTEM,
                       self.conn.check_support(
-                        self.conn.SUPPORT_CONN_FILESYSTEM),
+                        self.conn.SUPPORT_CONN_FILESYSTEM) and
+                      not self.vm.stable_defaults(),
                       _("Not supported for this hypervisor/libvirt "
                         "combination."))
         add_hw_option("Smartcard", "device_serial", PAGE_SMARTCARD,



But untested on RHEL

Tested with:
virt-manager-0.10.0-19.el7.noarch

Steps:
1.Launch virt-manager,open a guest.
2.Add hardware->"Filesystem",there is error message showed:"Not supported for this hypervisor/libvirt combination".

Refer to the above comments,move the bug to VERIFIED.

This request was resolved in Red Hat Enterprise Linux 7.0.

Contact your manager or support representative in case you have further questions about the request.