[Xen-changelog] [qemu-xen master] spapr: Treat Hardware Transactional Memory (HTM) as an optional capability

[patchbot@xxxxxxx]

commit 9070f408f491693291f7a7335340acc93d2610a5
Author:     David Gibson <david@xxxxxxxxxxxxxxxxxxxxx>
AuthorDate: Mon Dec 11 13:10:44 2017 +1100
Commit:     Michael Roth <mdroth@xxxxxxxxxxxxxxxxxx>
CommitDate: Mon Feb 5 18:53:23 2018 -0600

    spapr: Treat Hardware Transactional Memory (HTM) as an optional capability
    
    This adds an spapr capability bit for Hardware Transactional Memory.  It is
    enabled by default for pseries-2.11 and earlier machine types. with POWER8
    or later CPUs (as it must be, since earlier qemu versions would implicitly
    allow it).  However it is disabled by default for the latest pseries-2.12
    machine type.
    
    This means that with the latest machine type, HTM will not be available,
    regardless of CPU, unless it is explicitly enabled on the command line.
    That change is made on the basis that:
    
     * This way running with -M pseries,accel=tcg will start with whatever cpu
       and will provide the same guest visible model as with accel=kvm.
         - More specifically, this means existing make check tests don't have
           to be modified to use cap-htm=off in order to run with TCG
    
     * We hope to add a new "HTM without suspend" feature in the not too
       distant future which could work on both POWER8 and POWER9 cpus, and
       could be enabled by default.
    
     * Best guesses suggest that future POWER cpus may well only support the
       HTM-without-suspend model, not the (frankly, horribly overcomplicated)
       POWER8 style HTM with suspend.
    
     * Anecdotal evidence suggests problems with HTM being enabled when it
       wasn't wanted are more common than being missing when it was.
    
    Signed-off-by: David Gibson <david@xxxxxxxxxxxxxxxxxxxxx>
    Reviewed-by: Greg Kurz <groug@xxxxxxxx>
    (cherry picked from commit ee76a09fc72cfbfab2bb5529320ef7e460adffd8)
    Signed-off-by: Michael Roth <mdroth@xxxxxxxxxxxxxxxxxx>
---
 hw/ppc/spapr.c         | 15 ++++++++++-----
 hw/ppc/spapr_caps.c    | 29 ++++++++++++++++++++++++++++-
 include/hw/ppc/spapr.h |  3 +++
 3 files changed, 41 insertions(+), 6 deletions(-)

diff --git a/hw/ppc/spapr.c b/hw/ppc/spapr.c
index 958d894..08e4a14 100644
--- a/hw/ppc/spapr.c
+++ b/hw/ppc/spapr.c
@@ -253,7 +253,9 @@ static int spapr_fixup_cpu_numa_dt(void *fdt, int offset, 
PowerPCCPU *cpu)
 }
 
 /* Populate the "ibm,pa-features" property */
-static void spapr_populate_pa_features(PowerPCCPU *cpu, void *fdt, int offset,
+static void spapr_populate_pa_features(sPAPRMachineState *spapr,
+                                       PowerPCCPU *cpu,
+                                       void *fdt, int offset,
                                        bool legacy_guest)
 {
     CPUPPCState *env = &cpu->env;
@@ -318,7 +320,7 @@ static void spapr_populate_pa_features(PowerPCCPU *cpu, 
void *fdt, int offset,
          */
         pa_features[3] |= 0x20;
     }
-    if (kvmppc_has_cap_htm() && pa_size > 24) {
+    if (spapr_has_cap(spapr, SPAPR_CAP_HTM) && pa_size > 24) {
         pa_features[24] |= 0x80;    /* Transactional memory support */
     }
     if (legacy_guest && pa_size > 40) {
@@ -384,8 +386,8 @@ static int spapr_fixup_cpu_dt(void *fdt, sPAPRMachineState 
*spapr)
             return ret;
         }
 
-        spapr_populate_pa_features(cpu, fdt, offset,
-                                         spapr->cas_legacy_guest_workaround);
+        spapr_populate_pa_features(spapr, cpu, fdt, offset,
+                                   spapr->cas_legacy_guest_workaround);
     }
     return ret;
 }
@@ -579,7 +581,7 @@ static void spapr_populate_cpu_dt(CPUState *cs, void *fdt, 
int offset,
                           page_sizes_prop, page_sizes_prop_size)));
     }
 
-    spapr_populate_pa_features(cpu, fdt, offset, false);
+    spapr_populate_pa_features(spapr, cpu, fdt, offset, false);
 
     _FDT((fdt_setprop_cell(fdt, offset, "ibm,chip-id",
                            cs->cpu_index / vcpus_per_socket)));
@@ -3749,7 +3751,10 @@ static void 
spapr_machine_2_11_instance_options(MachineState *machine)
 
 static void spapr_machine_2_11_class_options(MachineClass *mc)
 {
+    sPAPRMachineClass *smc = SPAPR_MACHINE_CLASS(mc);
+
     spapr_machine_2_12_class_options(mc);
+    smc->default_caps = spapr_caps(SPAPR_CAP_HTM);
     SET_MACHINE_COMPAT(mc, SPAPR_COMPAT_2_11);
 }
 
diff --git a/hw/ppc/spapr_caps.c b/hw/ppc/spapr_caps.c
index 968ba7b..3b35b91 100644
--- a/hw/ppc/spapr_caps.c
+++ b/hw/ppc/spapr_caps.c
@@ -24,6 +24,10 @@
 #include "qemu/osdep.h"
 #include "qapi/error.h"
 #include "qapi/visitor.h"
+#include "sysemu/hw_accel.h"
+#include "target/ppc/cpu.h"
+#include "cpu-models.h"
+#include "kvm_ppc.h"
 
 #include "hw/ppc/spapr.h"
 
@@ -40,18 +44,41 @@ typedef struct sPAPRCapabilityInfo {
     void (*disallow)(sPAPRMachineState *spapr, Error **errp);
 } sPAPRCapabilityInfo;
 
+static void cap_htm_allow(sPAPRMachineState *spapr, Error **errp)
+{
+    if (tcg_enabled()) {
+        error_setg(errp,
+                   "No Transactional Memory support in TCG, try cap-htm=off");
+    } else if (kvm_enabled() && !kvmppc_has_cap_htm()) {
+        error_setg(errp,
+"KVM implementation does not support Transactional Memory, try cap-htm=off"
+            );
+    }
+}
+
 static sPAPRCapabilityInfo capability_table[] = {
+    {
+        .name = "htm",
+        .description = "Allow Hardware Transactional Memory (HTM)",
+        .flag = SPAPR_CAP_HTM,
+        .allow = cap_htm_allow,
+        /* TODO: add cap_htm_disallow */
+    },
 };
 
 static sPAPRCapabilities default_caps_with_cpu(sPAPRMachineState *spapr,
                                                CPUState *cs)
 {
     sPAPRMachineClass *smc = SPAPR_MACHINE_GET_CLASS(spapr);
+    PowerPCCPU *cpu = POWERPC_CPU(cs);
     sPAPRCapabilities caps;
 
     caps = smc->default_caps;
 
-    /* TODO: clamp according to cpu model */
+    if (!ppc_check_compat(cpu, CPU_POWERPC_LOGICAL_2_07,
+                          0, spapr->max_compat_pvr)) {
+        caps.mask &= ~SPAPR_CAP_HTM;
+    }
 
     return caps;
 }
diff --git a/include/hw/ppc/spapr.h b/include/hw/ppc/spapr.h
index c8852df..7242269 100644
--- a/include/hw/ppc/spapr.h
+++ b/include/hw/ppc/spapr.h
@@ -54,6 +54,9 @@ typedef enum {
  * Capabilities
  */
 
+/* Hardware Transactional Memory */
+#define SPAPR_CAP_HTM               0x0000000000000001ULL
+
 typedef struct sPAPRCapabilities sPAPRCapabilities;
 struct sPAPRCapabilities {
     uint64_t mask;
--
generated by git-patchbot for /home/xen/git/qemu-xen.git#master

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