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Re: [libvirt] [PATCHv2 3/8] conf: Add support for RNG device configuration in XML

On 02/23/13 00:33, Eric Blake wrote:
On 02/21/2013 07:47 AM, Peter Krempa wrote:
This patch adds basic configuration support for the RNG device suporting


the virtio model with the "random" and "egd" backend types as described
in the schema in the previous patch.

     Version 2:
     - fix a ton of memory leaks (I assumed that virXMLGetProp returns static strings)
     - Add new device type to even more places
     - Fix error message c&p error
     - Fix memleak in RNGDef free func

@@ -10601,6 +10734,22 @@ virDomainDefParseXML(virCapsPtr caps,

+    /* Parse the RNG device */
+    if ((n = virXPathNodeSet("./devices/rng", ctxt, &nodes)) < 0)
+        goto error;
+    if (n > 1) {
+        virReportError(VIR_ERR_XML_ERROR, "%s",
+                       _("only a single RNG device is supported"));

Is this an inherent limit of qemu?  For that matter, is it an inherent
limit, and no hypervisor can ever support more than one?  In the bare
metal case, can't you plug in multiple rng hardware dongles?

AFAIK qemu is able to support multiple RNG devices but I didn't find that particularly useful. I will follow up with a patch that will add support for more than one RNG device, although I don't think it will be used much.


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