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Re: [Qemu-ppc] [PATCHv3 2/4] pseries: Move CPU compatibility property to
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From: |
Greg Kurz |
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Subject: |
Re: [Qemu-ppc] [PATCHv3 2/4] pseries: Move CPU compatibility property to machine |
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Date: |
Tue, 2 May 2017 13:23:27 +0200 |
On Mon, 1 May 2017 12:33:04 +1000
David Gibson <address@hidden> wrote:
> On Thu, Apr 27, 2017 at 12:23:51PM -0500, Michael Roth wrote:
> > Quoting David Gibson (2017-04-27 02:28:41)
> > > 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 new
> > > removed cpu property.
> >
> > "now-deprecated cpu property" maybe?
>
> Good idea.
>
> > > Signed-off-by: David Gibson <address@hidden>
> > > ---
> > > hw/ppc/spapr.c | 6 +++-
> > > hw/ppc/spapr_cpu_core.c | 41 ++++++++++++++++++++--
> > > hw/ppc/spapr_hcall.c | 2 +-
> > > include/hw/ppc/spapr.h | 12 ++++---
> > > target/ppc/compat.c | 65 +++++++++++++++++++++++++++++++++++
> > > target/ppc/cpu.h | 6 ++--
> > > target/ppc/translate_init.c | 84
> > > +++++++++++++--------------------------------
> > > 7 files changed, 145 insertions(+), 71 deletions(-)
> > >
> > > diff --git a/hw/ppc/spapr.c b/hw/ppc/spapr.c
> > > index 80d12d0..547fa27 100644
> > > --- a/hw/ppc/spapr.c
> > > +++ b/hw/ppc/spapr.c
> > > @@ -2117,7 +2117,7 @@ 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);
> > >
> > > @@ -2480,6 +2480,10 @@ static void spapr_machine_initfn(Object *obj)
> > > " place of standard EPOW events when
> > > possible"
> > > " (required for memory hot-unplug
> > > support)",
> > > NULL);
> > > +
> > > + object_property_add(obj, "max-cpu-compat", "str",
> > > + ppc_compat_prop_get, ppc_compat_prop_set,
> > > + NULL, &spapr->max_compat_pvr, &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 4389ef4..ba610bc 100644
> > > --- a/hw/ppc/spapr_cpu_core.c
> > > +++ b/hw/ppc/spapr_cpu_core.c
> > > @@ -20,6 +20,43 @@
> > > #include "sysemu/numa.h"
> > > #include "qemu/error-report.h"
> > >
> > > +void spapr_cpu_parse_features(sPAPRMachineState *spapr)
> > > +{
> > > + /*
> > > + * Backwards compatibility hack:
> > > +
> >
> > Missing "*"
>
> Oops, fixed.
>
> > > + * 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 n, i;
> > > + gchar *compat_str = NULL;
> > > +
> > > + inpieces = g_strsplit(MACHINE(spapr)->cpu_model, ",", 0);
> > > + n = g_strv_length(inpieces);
> > > +
> > > + /* inpieces[0] is the actual model string */
> >
> > The comment seems a bit out of place unless we start with i = 1
>
> A good point. Yes, it should start from i=1.
>
> > > + for (i = 0; i < n; i++) {
> > > + if (g_str_has_prefix(inpieces[i], "compat=")) {
> > > + compat_str = inpieces[i];
> > > + }
> > > + }
> > > +
> > > + if (compat_str) {
> > > + char *val = compat_str + strlen("compat=");
> > > + object_property_set_str(OBJECT(spapr), val, "max-cpu-compat",
> > > + &error_fatal);
> > > + }
> > > +
> > > + 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 +107,10 @@ 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 9f18f75..d4dc12b 100644
> > > --- a/hw/ppc/spapr_hcall.c
> > > +++ b/hw/ppc/spapr_hcall.c
> > > @@ -1059,7 +1059,7 @@ static target_ulong
> > > h_client_architecture_support(PowerPCCPU *cpu,
> > > target_ulong list = ppc64_phys_to_real(args[0]);
> > > target_ulong ov_table;
> > > 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;
> > > sPAPROptionVector *ov1_guest, *ov5_guest, *ov5_cas_old, *ov5_updates;
> > > diff --git a/include/hw/ppc/spapr.h b/include/hw/ppc/spapr.h
> > > index 5802f88..40d5f89 100644
> > > --- a/include/hw/ppc/spapr.h
> > > +++ b/include/hw/ppc/spapr.h
> > > @@ -86,16 +86,19 @@ 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;
> > > @@ -633,6 +636,7 @@ 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..476dead 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,
> > > @@ -45,18 +48,21 @@ 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,
> > > @@ -189,3 +195,62 @@ int ppc_compat_max_threads(PowerPCCPU *cpu)
> > >
> > > return n_threads;
> > > }
> > > +
> > > +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);
> > > +}
> > > +
> > > +void ppc_compat_prop_set(Object *obj, Visitor *v, const char *name,
> > > + void *opaque, Error **errp)
> > > +{
> > > + Error *error = NULL;
> > > + 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);
> > > +}
> > > diff --git a/target/ppc/cpu.h b/target/ppc/cpu.h
> > > index e0ff041..e953e75 100644
> > > --- a/target/ppc/cpu.h
> > > +++ b/target/ppc/cpu.h
> > > @@ -1185,7 +1185,6 @@ 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.
> > > @@ -1197,7 +1196,6 @@ struct PowerPCCPU {
> > >
> > > CPUPPCState env;
> > > int cpu_dt_id;
> > > - uint32_t max_compat;
> > > uint32_t compat_pvr;
> > > PPCVirtualHypervisor *vhyp;
> > > Object *intc;
> > > @@ -1369,6 +1367,10 @@ 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_prop_get(Object *obj, Visitor *v,
> > > + const char *name, void *opaque, Error **err);
> > > +void ppc_compat_prop_set(Object *obj, Visitor *v,
> > > + const char *name, void *opaque, Error **err);
> > > #endif /* defined(TARGET_PPC64) */
> > >
> > > #include "exec/cpu-all.h"
> > > diff --git a/target/ppc/translate_init.c b/target/ppc/translate_init.c
> > > index e82e3e6..a92c825 100644
> > > --- a/target/ppc/translate_init.c
> > > +++ b/target/ppc/translate_init.c
> > > @@ -8413,73 +8413,35 @@ 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);
> > > - }
> > > -
> > > - g_free(value);
> > > + error_report("CPU 'compat' property is deprecated and has no effect;
> > > use max-cpu-compat machine property instead");
> >
> > Isn't the "and has no effect" portion a bit misleading? AFAICT it does
> > have an effect still, it just shouldn't be used anymore.
>
> No. Used as a property on the CPU object it really does have no
> effect. It's just that if you attach it to -cpu XXX, rather than to a
> -device specific-cpu-type, then it gets automatically translated to
> the new machine property. These calls should only be triggered in the
> second case.
>
But they also get triggered in the -cpu case... When passing
-cpu host,compat=power7 -machine type=pseries,accel=kvm
one gets:
qemu-system-ppc64: CPU 'compat' property is deprecated and has no effect; use
max-cpu-compat machine property instead
qemu-system-ppc64: can't apply global host-powerpc64-cpu.compat=power7: Invalid
parameter type for 'compat', expected: null
> > > + visit_type_null(v, name, errp);
Because the null string input visitor from patch 1/4 expects an empty
string:
+ if (!siv->string || siv->string[0]) {
+ error_setg(errp, QERR_INVALID_PARAMETER_TYPE, name ? name : "null",
+ "null");
+ }
and the error gets propagated all the way up.
I had suggested to break the propagation with:
+ visit_type_null(v, name, NULL);
You can find the discussion here:
http://patchwork.ozlabs.org/patch/705734/
> > > }
> > >
> > > -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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- Re: [Qemu-ppc] [PATCHv3 2/4] pseries: Move CPU compatibility property to machine,
Greg Kurz <=