On Fri, 2 Jun 2017 13:15:05 +1000 David Gibson <da...@gibson.dropbear.id.au> wrote:
> 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 <da...@gibson.dropbear.id.au>
> ---
Just one trivial style nit in ppc_compat_prop_set().
Reviewed-by: Greg Kurz <gr...@kaod.org>
and
Tested-by: Greg Kurz <gr...@kaod.org>
> hw/ppc/spapr.c | 6 ++-
> hw/ppc/spapr_cpu_core.c | 55 +++++++++++++++++++++++-
> hw/ppc/spapr_hcall.c | 8 ++--
> include/hw/ppc/spapr.h | 12 ++++--
> target/ppc/compat.c | 102
> ++++++++++++++++++++++++++++++++++++++++++++
> target/ppc/cpu.h | 5 ++-
> target/ppc/translate_init.c | 86 +++++++++++--------------------------
> 7 files changed, 201 insertions(+), 73 deletions(-)
>
> diff --git a/hw/ppc/spapr.c b/hw/ppc/spapr.c
> index ab3aab1..3c4e88f 100644
> --- a/hw/ppc/spapr.c
> +++ b/hw/ppc/spapr.c
> @@ -2134,7 +2134,7 @@ static void ppc_spapr_init(MachineState *machine)
> machine->cpu_model = kvm_enabled() ? "host" : smc->tcg_default_cpu;
> }
>
> - ppc_cpu_parse_features(machine->cpu_model);
> + spapr_cpu_parse_features(spapr);
>
> spapr_init_cpus(spapr);
>
> @@ -2497,6 +2497,10 @@ static void spapr_machine_initfn(Object *obj)
> " place of standard EPOW events when
> possible"
> " (required for memory hot-unplug
> support)",
> NULL);
> +
> + ppc_compat_add_property(obj, "max-cpu-compat", &spapr->max_compat_pvr,
> + "Maximum permitted CPU compatibility mode",
> + &error_fatal);
> }
>
> static void spapr_machine_finalizefn(Object *obj)
> diff --git a/hw/ppc/spapr_cpu_core.c b/hw/ppc/spapr_cpu_core.c
> index ff7058e..846d9e7 100644
> --- a/hw/ppc/spapr_cpu_core.c
> +++ b/hw/ppc/spapr_cpu_core.c
> @@ -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());
> @@ -70,10 +121,10 @@ 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;
> diff --git a/hw/ppc/spapr_hcall.c b/hw/ppc/spapr_hcall.c
> index aae5a62..a9bb3ed 100644
> --- a/hw/ppc/spapr_hcall.c
> +++ b/hw/ppc/spapr_hcall.c
> @@ -1044,11 +1044,11 @@ static target_ulong h_signal_sys_reset(PowerPCCPU
> *cpu,
> }
> }
>
> -static uint32_t cas_check_pvr(PowerPCCPU *cpu, target_ulong *addr,
> - Error **errp)
> +static uint32_t cas_check_pvr(sPAPRMachineState *spapr, PowerPCCPU *cpu,
> + target_ulong *addr, Error **errp)
> {
> bool explicit_match = false; /* Matched the CPU's real PVR */
> - uint32_t max_compat = cpu->max_compat;
> + uint32_t max_compat = spapr->max_compat_pvr;
> uint32_t best_compat = 0;
> int i;
>
> @@ -1104,7 +1104,7 @@ static target_ulong
> h_client_architecture_support(PowerPCCPU *cpu,
> bool guest_radix;
> Error *local_err = NULL;
>
> - cas_pvr = cas_check_pvr(cpu, &addr, &local_err);
> + cas_pvr = cas_check_pvr(spapr, cpu, &addr, &local_err);
> if (local_err) {
> error_report_err(local_err);
> return H_HARDWARE;
> diff --git a/include/hw/ppc/spapr.h b/include/hw/ppc/spapr.h
> index 98fb78b..4da92e2 100644
> --- a/include/hw/ppc/spapr.h
> +++ b/include/hw/ppc/spapr.h
> @@ -87,16 +87,19 @@ struct sPAPRMachineState {
> uint64_t rtc_offset; /* Now used only during incoming migration */
> struct PPCTimebase tb;
> bool has_graphics;
> - sPAPROptionVector *ov5; /* QEMU-supported option vectors */
> - sPAPROptionVector *ov5_cas; /* negotiated (via CAS) option vectors */
> - bool cas_reboot;
> - bool cas_legacy_guest_workaround;
>
> Notifier epow_notifier;
> QTAILQ_HEAD(, sPAPREventLogEntry) pending_events;
> bool use_hotplug_event_source;
> sPAPREventSource *event_sources;
>
> + /* ibm,client-architecture-support option negotiation */
> + bool cas_reboot;
> + bool cas_legacy_guest_workaround;
> + sPAPROptionVector *ov5; /* QEMU-supported option vectors */
> + sPAPROptionVector *ov5_cas; /* negotiated (via CAS) option vectors */
> + uint32_t max_compat_pvr;
> +
> /* Migration state */
> int htab_save_index;
> bool htab_first_pass;
> @@ -639,6 +642,7 @@ void
> spapr_hotplug_req_add_by_count_indexed(sPAPRDRConnectorType drc_type,
> uint32_t count, uint32_t index);
> void spapr_hotplug_req_remove_by_count_indexed(sPAPRDRConnectorType drc_type,
> uint32_t count, uint32_t
> index);
> +void spapr_cpu_parse_features(sPAPRMachineState *spapr);
> void *spapr_populate_hotplug_cpu_dt(CPUState *cs, int *fdt_offset,
> sPAPRMachineState *spapr);
>
> diff --git a/target/ppc/compat.c b/target/ppc/compat.c
> index e8ec1e1..e72839f 100644
> --- a/target/ppc/compat.c
> +++ b/target/ppc/compat.c
> @@ -24,9 +24,11 @@
> #include "sysemu/cpus.h"
> #include "qemu/error-report.h"
> #include "qapi/error.h"
> +#include "qapi/visitor.h"
> #include "cpu-models.h"
>
> typedef struct {
> + const char *name;
> uint32_t pvr;
> uint64_t pcr;
> uint64_t pcr_level;
> @@ -38,6 +40,7 @@ static const CompatInfo compat_table[] = {
> * Ordered from oldest to newest - the code relies on this
> */
> { /* POWER6, ISA2.05 */
> + .name = "power6",
> .pvr = CPU_POWERPC_LOGICAL_2_05,
> .pcr = PCR_COMPAT_3_00 | PCR_COMPAT_2_07 | PCR_COMPAT_2_06 |
> PCR_COMPAT_2_05 | PCR_TM_DIS | PCR_VSX_DIS,
> @@ -45,24 +48,28 @@ static const CompatInfo compat_table[] = {
> .max_threads = 2,
> },
> { /* POWER7, ISA2.06 */
> + .name = "power7",
> .pvr = CPU_POWERPC_LOGICAL_2_06,
> .pcr = PCR_COMPAT_3_00 | PCR_COMPAT_2_07 | PCR_COMPAT_2_06 |
> PCR_TM_DIS,
> .pcr_level = PCR_COMPAT_2_06,
> .max_threads = 4,
> },
> {
> + .name = "power7+",
> .pvr = CPU_POWERPC_LOGICAL_2_06_PLUS,
> .pcr = PCR_COMPAT_3_00 | PCR_COMPAT_2_07 | PCR_COMPAT_2_06 |
> PCR_TM_DIS,
> .pcr_level = PCR_COMPAT_2_06,
> .max_threads = 4,
> },
> { /* POWER8, ISA2.07 */
> + .name = "power8",
> .pvr = CPU_POWERPC_LOGICAL_2_07,
> .pcr = PCR_COMPAT_3_00 | PCR_COMPAT_2_07,
> .pcr_level = PCR_COMPAT_2_07,
> .max_threads = 8,
> },
> { /* POWER9, ISA3.00 */
> + .name = "power9",
> .pvr = CPU_POWERPC_LOGICAL_3_00,
> .pcr = PCR_COMPAT_3_00,
> .pcr_level = PCR_COMPAT_3_00,
> @@ -189,3 +196,98 @@ int ppc_compat_max_threads(PowerPCCPU *cpu)
>
> return n_threads;
> }
> +
> +static void ppc_compat_prop_get(Object *obj, Visitor *v, const char *name,
> + void *opaque, Error **errp)
> +{
> + uint32_t compat_pvr = *((uint32_t *)opaque);
> + const char *value;
> +
> + if (!compat_pvr) {
> + value = "";
> + } else {
> + const CompatInfo *compat = compat_by_pvr(compat_pvr);
> +
> + g_assert(compat);
> +
> + value = compat->name;
> + }
> +
> + visit_type_str(v, name, (char **)&value, errp);
> +}
> +
> +static void ppc_compat_prop_set(Object *obj, Visitor *v, const char *name,
> + void *opaque, Error **errp)
> +{
> + Error *error = NULL;
s/error/local_error maybe ? For consistency with ppc_compat_add_property()
below.
> + char *value;
> + uint32_t compat_pvr;
> +
> + visit_type_str(v, name, &value, &error);
> + if (error) {
> + error_propagate(errp, error);
> + return;
> + }
> +
> + if (strcmp(value, "") == 0) {
> + compat_pvr = 0;
> + } else {
> + int i;
> + const CompatInfo *compat = NULL;
> +
> + for (i = 0; i < ARRAY_SIZE(compat_table); i++) {
> + if (strcmp(value, compat_table[i].name) == 0) {
> + compat = &compat_table[i];
> + break;
> +
> + }
> + }
> +
> + if (!compat) {
> + error_setg(errp, "Invalid compatibility mode \"%s\"", value);
> + goto out;
> + }
> + compat_pvr = compat->pvr;
> + }
> +
> + *((uint32_t *)opaque) = compat_pvr;
> +
> +out:
> + g_free(value);
> +}
> +
> +void ppc_compat_add_property(Object *obj, const char *name,
> + uint32_t *compat_pvr, const char *basedesc,
> + Error **errp)
> +{
> + Error *local_err = NULL;
> + gchar *namesv[ARRAY_SIZE(compat_table) + 1];
> + gchar *names, *desc;
> + int i;
> +
> + object_property_add(obj, name, "string",
> + ppc_compat_prop_get, ppc_compat_prop_set, NULL,
> + compat_pvr, &local_err);
> + if (local_err) {
> + goto out;
> + }
> +
> + for (i = 0; i < ARRAY_SIZE(compat_table); i++) {
> + /*
> + * Have to discard const here, because g_strjoinv() takes
> + * (gchar **), not (const gchar **) :(
> + */
> + namesv[i] = (gchar *)compat_table[i].name;
> + }
> + namesv[ARRAY_SIZE(compat_table)] = NULL;
> +
> + names = g_strjoinv(", ", namesv);
> + desc = g_strdup_printf("%s. Valid values are %s.", basedesc, names);
> + object_property_set_description(obj, name, desc, &local_err);
> +
> + g_free(names);
> + g_free(desc);
> +
> +out:
> + error_propagate(errp, local_err);
> +}
> diff --git a/target/ppc/cpu.h b/target/ppc/cpu.h
> index 401e10e..4517b4b 100644
> --- a/target/ppc/cpu.h
> +++ b/target/ppc/cpu.h
> @@ -1189,7 +1189,6 @@ typedef struct PPCVirtualHypervisorClass
> PPCVirtualHypervisorClass;
> * PowerPCCPU:
> * @env: #CPUPPCState
> * @cpu_dt_id: CPU index used in the device tree. KVM uses this index too
> - * @max_compat: Maximal supported logical PVR from the command line
> * @compat_pvr: Current logical PVR, zero if in "raw" mode
> *
> * A PowerPC CPU.
> @@ -1201,7 +1200,6 @@ struct PowerPCCPU {
>
> CPUPPCState env;
> int cpu_dt_id;
> - uint32_t max_compat;
> uint32_t compat_pvr;
> PPCVirtualHypervisor *vhyp;
> Object *intc;
> @@ -1374,6 +1372,9 @@ void ppc_set_compat(PowerPCCPU *cpu, uint32_t
> compat_pvr, Error **errp);
> void ppc_set_compat_all(uint32_t compat_pvr, Error **errp);
> #endif
> int ppc_compat_max_threads(PowerPCCPU *cpu);
> +void ppc_compat_add_property(Object *obj, const char *name,
> + uint32_t *compat_pvr, const char *basedesc,
> + Error **errp);
> #endif /* defined(TARGET_PPC64) */
>
> #include "exec/cpu-all.h"
> diff --git a/target/ppc/translate_init.c b/target/ppc/translate_init.c
> index 56a0ab2..e837cd2 100644
> --- a/target/ppc/translate_init.c
> +++ b/target/ppc/translate_init.c
> @@ -33,6 +33,7 @@
> #include "hw/qdev-properties.h"
> #include "hw/ppc/ppc.h"
> #include "mmu-book3s-v3.h"
> +#include "sysemu/qtest.h"
>
> //#define PPC_DUMP_CPU
> //#define PPC_DEBUG_SPR
> @@ -8413,73 +8414,38 @@ POWERPC_FAMILY(POWER5P)(ObjectClass *oc, void *data)
> pcc->l1_icache_size = 0x10000;
> }
>
> -static void powerpc_get_compat(Object *obj, Visitor *v, const char *name,
> - void *opaque, Error **errp)
> -{
> - char *value = (char *)"";
> - Property *prop = opaque;
> - uint32_t *max_compat = qdev_get_prop_ptr(DEVICE(obj), prop);
> -
> - switch (*max_compat) {
> - case CPU_POWERPC_LOGICAL_2_05:
> - value = (char *)"power6";
> - break;
> - case CPU_POWERPC_LOGICAL_2_06:
> - value = (char *)"power7";
> - break;
> - case CPU_POWERPC_LOGICAL_2_07:
> - value = (char *)"power8";
> - break;
> - case 0:
> - break;
> - default:
> - error_report("Internal error: compat is set to %x", *max_compat);
> - abort();
> - break;
> - }
> -
> - visit_type_str(v, name, &value, errp);
> -}
> -
> -static void powerpc_set_compat(Object *obj, Visitor *v, const char *name,
> - void *opaque, Error **errp)
> +/*
> + * The CPU used to have a "compat" property which set the
> + * compatibility mode PVR. However, this was conceptually broken - it
> + * only makes sense on the pseries machine type (otherwise the guest
> + * owns the PCR and can control the compatibility mode itself). It's
> + * been replaced with the 'max-cpu-compat' property on the pseries
> + * machine type. For backwards compatibility, pseries specially
> + * parses the -cpu parameter and converts old compat= parameters into
> + * the appropriate machine parameters. This stub implementation of
> + * the parameter catches any uses on explicitly created CPUs.
> + */
> +static void getset_compat_deprecated(Object *obj, Visitor *v, const char
> *name,
> + void *opaque, Error **errp)
> {
> - Error *error = NULL;
> - char *value = NULL;
> - Property *prop = opaque;
> - uint32_t *max_compat = qdev_get_prop_ptr(DEVICE(obj), prop);
> -
> - visit_type_str(v, name, &value, &error);
> - if (error) {
> - error_propagate(errp, error);
> - return;
> - }
> -
> - if (strcmp(value, "power6") == 0) {
> - *max_compat = CPU_POWERPC_LOGICAL_2_05;
> - } else if (strcmp(value, "power7") == 0) {
> - *max_compat = CPU_POWERPC_LOGICAL_2_06;
> - } else if (strcmp(value, "power8") == 0) {
> - *max_compat = CPU_POWERPC_LOGICAL_2_07;
> - } else {
> - error_setg(errp, "Invalid compatibility mode \"%s\"", value);
> + if (!qtest_enabled()) {
> + error_report("CPU 'compat' property is deprecated and has no effect;
> "
> + "use max-cpu-compat machine property instead");
> }
> -
> - g_free(value);
> + visit_type_null(v, name, NULL);
> }
>
> -static PropertyInfo powerpc_compat_propinfo = {
> +static PropertyInfo ppc_compat_deprecated_propinfo = {
> .name = "str",
> - .description = "compatibility mode, power6/power7/power8",
> - .get = powerpc_get_compat,
> - .set = powerpc_set_compat,
> + .description = "compatibility mode (deprecated)",
> + .get = getset_compat_deprecated,
> + .set = getset_compat_deprecated,
> };
> -
> -#define DEFINE_PROP_POWERPC_COMPAT(_n, _s, _f) \
> - DEFINE_PROP(_n, _s, _f, powerpc_compat_propinfo, uint32_t)
> -
> static Property powerpc_servercpu_properties[] = {
> - DEFINE_PROP_POWERPC_COMPAT("compat", PowerPCCPU, max_compat),
> + {
> + .name = "compat",
> + .info = &ppc_compat_deprecated_propinfo,
> + },
> DEFINE_PROP_END_OF_LIST(),
> };
>
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