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PowerPC : Add support for launching VM in 'compat' mode.

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PowerISA allows processors to run VMs in binary compatibility ("compat")
mode supporting an older version of ISA. QEMU has recently added support to
explicitly denote a VM running in compatibility mode through commit 6d9412ea
& 8dfa3a5e85. Now, a "compat" mode VM can be run by invoking this qemu
commandline on a POWER8 host:  -cpu host,compat=power7.

This patch allows libvirt to exploit cpu mode 'host-model' to describe this
new mode for PowerKVM guests. For example, when a user wants to request a
power7 vm to run in compatibility mode on a Power8 host, this can be
described in XML as follows :

  <cpu mode='host-model'>
    <model>power7</model>
  </cpu>

Signed-off-by: Prerna Saxena <prerna@linux.vnet.ibm.com>
Signed-off-by: Li Zhang <zhlcindy@linux.vnet.ibm.com>
Signed-off-by: Pradipta Kr. Banerjee <bpradip@in.ibm.com>
Acked-by: Michal Privoznik <mprivozn@redhat.com>
This commit is contained in:
Prerna Saxena 2014-11-04 22:52:44 +05:30 committed by Michal Privoznik
parent da636d83dc
commit addce06c92
3 changed files with 12 additions and 10 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
src/conf/cpu_conf.c
View File

@ -619,6 +619,7 @@ virCPUDefFormatBuf(virBufferPtr buf,
return 0;
formatModel = (def->mode == VIR_CPU_MODE_CUSTOM ||
def->mode == VIR_CPU_MODE_HOST_MODEL ||
(flags & VIR_DOMAIN_XML_UPDATE_CPU));
formatFallback = (def->type == VIR_CPU_TYPE_GUEST &&
(def->mode == VIR_CPU_MODE_HOST_MODEL ||

11
src/cpu/cpu_powerpc.c
View File

@ -562,8 +562,8 @@ ppcUpdate(virCPUDefPtr guest,
static virCPUDefPtr
ppcBaseline(virCPUDefPtr *cpus,
unsigned int ncpus,
const char **models,
unsigned int nmodels,
const char **models ATTRIBUTE_UNUSED,
unsigned int nmodels ATTRIBUTE_UNUSED,
unsigned int flags)
{
struct ppc_map *map = NULL;
@ -583,13 +583,6 @@ ppcBaseline(virCPUDefPtr *cpus,
goto error;
}
if (!cpuModelIsAllowed(model->name, models, nmodels)) {
virReportError(VIR_ERR_CONFIG_UNSUPPORTED,
_("CPU model %s is not supported by hypervisor"),
model->name);
goto error;
}
for (i = 0; i < ncpus; i++) {
const struct ppc_vendor *vnd;

10
src/qemu/qemu_command.c
View File

@ -6226,7 +6226,9 @@ qemuBuildCpuModelArgStr(virQEMUDriverPtr driver,
*hasHwVirt = hasSVM > 0 ? true : false;
}
if (cpu->mode == VIR_CPU_MODE_HOST_PASSTHROUGH) {
if ((cpu->mode == VIR_CPU_MODE_HOST_PASSTHROUGH) ||
((cpu->mode == VIR_CPU_MODE_HOST_MODEL) &&
ARCH_IS_PPC64(def->os.arch))) {
const char *mode = virCPUModeTypeToString(cpu->mode);
if (!virQEMUCapsGet(qemuCaps, QEMU_CAPS_CPU_HOST)) {
virReportError(VIR_ERR_CONFIG_UNSUPPORTED,
@ -6241,6 +6243,12 @@ qemuBuildCpuModelArgStr(virQEMUDriverPtr driver,
goto cleanup;
}
virBufferAddLit(buf, "host");
if (ARCH_IS_PPC64(def->os.arch) &&
cpu->mode == VIR_CPU_MODE_HOST_MODEL) {
virBufferAsprintf(buf, ",compat=%s", def->cpu->model);
}
} else {
if (VIR_ALLOC(guest) < 0)
goto cleanup;