libvirt xml config does not have possibility to select another bios file for qemu or kvm.
As to XEN and other hypervisors, I dont know how it is realized. But for kvm/qemu here is a patch. Now it can be controlled via xml domain config: <biosfile>bios-alternative.bin</biosfile> Miroslav Scaldov
diff -r -c libvirt-0.6.5.old/src/domain_conf.c libvirt-0.6.5/src/domain_conf.c
*** libvirt-0.6.5.old/src/domain_conf.c 2009-06-25 17:45:54.000000000 +0400
--- libvirt-0.6.5/src/domain_conf.c 2009-09-01 10:57:03.000000000 +0400
***************
*** 2222,2227 ****
--- 2222,2230 ----
if (virXPathULong(conn, "string(./currentMemory[1])", ctxt, &def->memory) < 0)
def->memory = def->maxmem;
+ def->cpumodel = virXPathString(conn, "string(./cpumodel[1])", ctxt);
+ def->cpumodel = virXPathString(conn, "string(./biosfile[1])", ctxt);
+
if (virXPathULong(conn, "string(./vcpu[1])", ctxt, &def->vcpus) < 0)
def->vcpus = 1;
diff -r -c libvirt-0.6.5.old/src/domain_conf.h libvirt-0.6.5/src/domain_conf.h
*** libvirt-0.6.5.old/src/domain_conf.h 2009-06-17 12:30:44.000000000 +0400
--- libvirt-0.6.5/src/domain_conf.h 2009-09-01 10:56:12.000000000 +0400
***************
*** 459,464 ****
--- 459,466 ----
unsigned long memory;
unsigned long maxmem;
+ char *cpumodel;
+ char *biosfile;
unsigned long vcpus;
int cpumasklen;
char *cpumask;
diff -r -c libvirt-0.6.5.old/src/qemu_conf.c libvirt-0.6.5/src/qemu_conf.c
*** libvirt-0.6.5.old/src/qemu_conf.c 2009-07-03 17:07:21.000000000 +0400
--- libvirt-0.6.5/src/qemu_conf.c 2009-09-01 11:37:11.000000000 +0400
***************
*** 973,978 ****
--- 973,980 ----
strstr(emulator, "x86_64")))
cpu = "qemu32";
+ if(def->cpumodel) cpu = def->cpumodel;
+
#define ADD_ARG_SPACE \
do { \
if (qargc == qarga) { \
***************
*** 1065,1070 ****
--- 1067,1078 ----
ADD_ARG_LIT(emulator);
ADD_ARG_LIT("-S");
+ if(def->biosfile)
+ {
+ ADD_ARG_LIT("-bios");
+ ADD_ARG_LIT(def->biosfile);
+ }
+
/* This should *never* be NULL, since we always provide
* a machine in the capabilities data for QEMU. So this
* check is just here as a safety in case the unexpected
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