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cpu: Implement backwards compatibility in the ppc64 driver

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All previously recognized CPU models (POWER7_v2.1, POWER7_v2.3,
POWER7+_v2.1 and POWER8_v1.0) are internally converted to the
corrisponding generation name so that existing guests don't stop
working.
This commit is contained in:
Andrea Bolognani 2015-08-07 17:39:18 +02:00
parent 36300d2ba1
commit dee2247afa
1 changed files with 45 additions and 2 deletions
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47
src/cpu/cpu_ppc64.c
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@ -57,6 +57,33 @@ struct ppc64_map {
struct ppc64_model *models;
};
/* Convert a legacy CPU definition by transforming
* model names to generation names:
* POWER7_v2.1 => POWER7
* POWER7_v2.3 => POWER7
* POWER7+_v2.1 => POWER7
* POWER8_v1.0 => POWER8 */
static virCPUDefPtr
ppc64ConvertLegacyCPUDef(const virCPUDef *legacy)
{
virCPUDefPtr cpu;
if (!(cpu = virCPUDefCopy(legacy)))
goto out;
if (!(STREQ(cpu->model, "POWER7_v2.1") ||
STREQ(cpu->model, "POWER7_v2.3") ||
STREQ(cpu->model, "POWER7+_v2.1") ||
STREQ(cpu->model, "POWER8_v1.0"))) {
goto out;
}
cpu->model[strlen("POWERx")] = 0;
out:
return cpu;
}
static void
ppc64DataFree(virCPUppc64Data *data)
{
@ -424,18 +451,22 @@ ppc64MakeCPUData(virArch arch,
static virCPUCompareResult
ppc64Compute(virCPUDefPtr host,
const virCPUDef *cpu,
const virCPUDef *other,
virCPUDataPtr *guestData,
char **message)
{
struct ppc64_map *map = NULL;
struct ppc64_model *host_model = NULL;
struct ppc64_model *guest_model = NULL;
virCPUDefPtr cpu = NULL;
virCPUCompareResult ret = VIR_CPU_COMPARE_ERROR;
virArch arch;
size_t i;
/* Ensure existing configurations are handled correctly */
if (!(cpu = ppc64ConvertLegacyCPUDef(other)))
goto cleanup;
if (cpu->arch != VIR_ARCH_NONE) {
bool found = false;
@ -504,6 +535,7 @@ ppc64Compute(virCPUDefPtr host,
ret = VIR_CPU_COMPARE_IDENTICAL;
cleanup:
virCPUDefFree(cpu);
ppc64MapFree(map);
ppc64ModelFree(host_model);
ppc64ModelFree(guest_model);
@ -681,6 +713,17 @@ ppc64DriverBaseline(virCPUDefPtr *cpus,
for (i = 0; i < ncpus; i++) {
const struct ppc64_vendor *vnd;
/* Hosts running old (<= 1.2.18) versions of libvirt will report
* strings like 'power7+' or 'power8e' instead of proper CPU model
* names in the capabilities XML; moreover, they lack information
* about some proper CPU models like 'POWER8'.
* This implies two things:
* 1) baseline among such hosts never worked
* 2) while a few models, eg. 'POWER8_v1.0', could work on both
* old and new versions of libvirt, the information we have
* here is not enough to pick such a model
* Hence we just compare models by name to decide whether or not
* two hosts are compatible */
if (STRNEQ(cpus[i]->model, model->name)) {
virReportError(VIR_ERR_OPERATION_FAILED, "%s",
_("CPUs are incompatible"));