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pseries: Move CPU compatibility property to machine

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Server class POWER CPUs have a "compat" property, which is used to set the
backwards compatibility mode for the processor.  However, this only makes
sense for machine types which don't give the guest access to hypervisor
privilege - otherwise the compatibility level is under the guest's control.

To reflect this, this removes the CPU 'compat' property and instead
creates a 'max-cpu-compat' property on the pseries machine.  Strictly
speaking this breaks compatibility, but AFAIK the 'compat' option was
never (directly) used with -device or device_add.

The option was used with -cpu.  So, to maintain compatibility, this
patch adds a hack to the cpu option parsing to strip out any compat
options supplied with -cpu and set them on the machine property
instead of the now deprecated cpu property.

Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
Tested-by: Suraj Jitindar Singh <sjitindarsingh@gmail.com>
Reviewed-by: Greg Kurz <groug@kaod.org>
Tested-by: Greg Kurz <groug@kaod.org>
Tested-by: Andrea Bolognani <abologna@redhat.com>
This commit is contained in:
David Gibson 2017-06-11 20:33:59 +08:00
parent a733371214
commit 7843c0d60d
7 changed files with 201 additions and 73 deletions
Download patch file Download diff file Expand all files Collapse all files

55
hw/ppc/spapr_cpu_core.c
View file

@ -20,6 +20,57 @@
#include "sysemu/numa.h"
#include "qemu/error-report.h"
void spapr_cpu_parse_features(sPAPRMachineState *spapr)
{
/*
* Backwards compatibility hack:
*
* CPUs had a "compat=" property which didn't make sense for
* anything except pseries. It was replaced by "max-cpu-compat"
* machine option. This supports old command lines like
* -cpu POWER8,compat=power7
* By stripping the compat option and applying it to the machine
* before passing it on to the cpu level parser.
*/
gchar **inpieces;
int i, j;
gchar *compat_str = NULL;
inpieces = g_strsplit(MACHINE(spapr)->cpu_model, ",", 0);
/* inpieces[0] is the actual model string */
i = 1;
j = 1;
while (inpieces[i]) {
if (g_str_has_prefix(inpieces[i], "compat=")) {
/* in case of multiple compat= options */
g_free(compat_str);
compat_str = inpieces[i];
} else {
j++;
}
i++;
/* Excise compat options from list */
inpieces[j] = inpieces[i];
}
if (compat_str) {
char *val = compat_str + strlen("compat=");
gchar *newprops = g_strjoinv(",", inpieces);
object_property_set_str(OBJECT(spapr), val, "max-cpu-compat",
&error_fatal);
ppc_cpu_parse_features(newprops);
g_free(newprops);
} else {
ppc_cpu_parse_features(MACHINE(spapr)->cpu_model);
}
g_strfreev(inpieces);
}
static void spapr_cpu_reset(void *opaque)
{
sPAPRMachineState *spapr = SPAPR_MACHINE(qdev_get_machine());
@ -67,10 +118,10 @@ static void spapr_cpu_init(sPAPRMachineState *spapr, PowerPCCPU *cpu,
/* Enable PAPR mode in TCG or KVM */
cpu_ppc_set_papr(cpu, PPC_VIRTUAL_HYPERVISOR(spapr));
if (cpu->max_compat) {
if (spapr->max_compat_pvr) {
Error *local_err = NULL;
ppc_set_compat(cpu, cpu->max_compat, &local_err);
ppc_set_compat(cpu, spapr->max_compat_pvr, &local_err);
if (local_err) {
error_propagate(errp, local_err);
return;