[PATCH v6 8/9] target/i386/kvm: support perfmon-v2 for reset

[Dongli Zhang <dongli.zhang@oracle.com>]

Since perfmon-v2, the AMD PMU supports additional registers. This update
includes get/put functionality for these extra registers.

Similar to the implementation in KVM:

- MSR_CORE_PERF_GLOBAL_STATUS and MSR_AMD64_PERF_CNTR_GLOBAL_STATUS both
use env->msr_global_status.
- MSR_CORE_PERF_GLOBAL_CTRL and MSR_AMD64_PERF_CNTR_GLOBAL_CTL both use
env->msr_global_ctrl.
- MSR_CORE_PERF_GLOBAL_OVF_CTRL and MSR_AMD64_PERF_CNTR_GLOBAL_STATUS_CLR
both use env->msr_global_ovf_ctrl.

No changes are needed for vmstate_msr_architectural_pmu or
pmu_enable_needed().

Signed-off-by: Dongli Zhang <dongli.zhang@oracle.com>
Reviewed-by: Zhao Liu <zhao1.liu@intel.com>
Reviewed-by: Sandipan Das <sandipan.das@amd.com>
---
Changed since v1:
  - Use "has_pmu_version > 1", not "has_pmu_version == 2".
Changed since v2:
  - Use cpuid_find_entry() instead of cpu_x86_cpuid().
  - Change has_pmu_version to pmu_version.
  - Cap num_pmu_gp_counters with MAX_GP_COUNTERS.
Changed since v4:
  - Add Reviewed-by from Sandipan.

 target/i386/cpu.h     |  4 ++++
 target/i386/kvm/kvm.c | 48 +++++++++++++++++++++++++++++++++++--------
 2 files changed, 43 insertions(+), 9 deletions(-)

diff --git a/target/i386/cpu.h b/target/i386/cpu.h
index 3fe6263ecf..e6480a6871 100644
--- a/target/i386/cpu.h
+++ b/target/i386/cpu.h
@@ -486,6 +486,10 @@ typedef enum X86Seg {
 #define MSR_CORE_PERF_GLOBAL_CTRL       0x38f
 #define MSR_CORE_PERF_GLOBAL_OVF_CTRL   0x390
 
+#define MSR_AMD64_PERF_CNTR_GLOBAL_STATUS       0xc0000300
+#define MSR_AMD64_PERF_CNTR_GLOBAL_CTL          0xc0000301
+#define MSR_AMD64_PERF_CNTR_GLOBAL_STATUS_CLR   0xc0000302
+
 #define MSR_K7_EVNTSEL0                 0xc0010000
 #define MSR_K7_PERFCTR0                 0xc0010004
 #define MSR_F15H_PERF_CTL0              0xc0010200
diff --git a/target/i386/kvm/kvm.c b/target/i386/kvm/kvm.c
index ff9be6a06f..4bbdf996ef 100644
--- a/target/i386/kvm/kvm.c
+++ b/target/i386/kvm/kvm.c
@@ -2151,6 +2151,16 @@ static void kvm_init_pmu_info_amd(struct kvm_cpuid2 *cpuid, X86CPU *cpu)
     }
 
     num_pmu_gp_counters = AMD64_NUM_COUNTERS_CORE;
+
+    c = cpuid_find_entry(cpuid, 0x80000022, 0);
+    if (c && (c->eax & CPUID_8000_0022_EAX_PERFMON_V2)) {
+        pmu_version = 2;
+        num_pmu_gp_counters = c->ebx & 0xf;
+
+        if (num_pmu_gp_counters > MAX_GP_COUNTERS) {
+            num_pmu_gp_counters = MAX_GP_COUNTERS;
+        }
+    }
 }
 
 static bool is_host_compat_vendor(CPUX86State *env)
@@ -4218,13 +4228,14 @@ static int kvm_put_msrs(X86CPU *cpu, int level)
             uint32_t step = 1;
 
             /*
-             * When PERFCORE is enabled, AMD PMU uses a separate set of
-             * addresses for the selector and counter registers.
-             * Additionally, the address of the next selector or counter
-             * register is determined by incrementing the address of the
-             * current register by two.
+             * When PERFCORE or PerfMonV2 is enabled, AMD PMU uses a
+             * separate set of addresses for the selector and counter
+             * registers. Additionally, the address of the next selector or
+             * counter register is determined by incrementing the address
+             * of the current register by two.
              */
-            if (num_pmu_gp_counters == AMD64_NUM_COUNTERS_CORE) {
+            if (num_pmu_gp_counters == AMD64_NUM_COUNTERS_CORE ||
+                pmu_version > 1) {
                 sel_base = MSR_F15H_PERF_CTL0;
                 ctr_base = MSR_F15H_PERF_CTR0;
                 step = 2;
@@ -4236,6 +4247,15 @@ static int kvm_put_msrs(X86CPU *cpu, int level)
                 kvm_msr_entry_add(cpu, sel_base + i * step,
                                   env->msr_gp_evtsel[i]);
             }
+
+            if (pmu_version > 1) {
+                kvm_msr_entry_add(cpu, MSR_AMD64_PERF_CNTR_GLOBAL_STATUS,
+                                  env->msr_global_status);
+                kvm_msr_entry_add(cpu, MSR_AMD64_PERF_CNTR_GLOBAL_STATUS_CLR,
+                                  env->msr_global_ovf_ctrl);
+                kvm_msr_entry_add(cpu, MSR_AMD64_PERF_CNTR_GLOBAL_CTL,
+                                  env->msr_global_ctrl);
+            }
         }
 
         /*
@@ -4713,13 +4733,14 @@ static int kvm_get_msrs(X86CPU *cpu)
         uint32_t step = 1;
 
         /*
-         * When PERFCORE is enabled, AMD PMU uses a separate set of
-         * addresses for the selector and counter registers.
+         * When PERFCORE or PerfMonV2 is enabled, AMD PMU uses a separate
+         * set of addresses for the selector and counter registers.
          * Additionally, the address of the next selector or counter
          * register is determined by incrementing the address of the
          * current register by two.
          */
-        if (num_pmu_gp_counters == AMD64_NUM_COUNTERS_CORE) {
+        if (num_pmu_gp_counters == AMD64_NUM_COUNTERS_CORE ||
+            pmu_version > 1) {
             sel_base = MSR_F15H_PERF_CTL0;
             ctr_base = MSR_F15H_PERF_CTR0;
             step = 2;
@@ -4729,6 +4750,12 @@ static int kvm_get_msrs(X86CPU *cpu)
             kvm_msr_entry_add(cpu, ctr_base + i * step, 0);
             kvm_msr_entry_add(cpu, sel_base + i * step, 0);
         }
+
+        if (pmu_version > 1) {
+            kvm_msr_entry_add(cpu, MSR_AMD64_PERF_CNTR_GLOBAL_CTL, 0);
+            kvm_msr_entry_add(cpu, MSR_AMD64_PERF_CNTR_GLOBAL_STATUS, 0);
+            kvm_msr_entry_add(cpu, MSR_AMD64_PERF_CNTR_GLOBAL_STATUS_CLR, 0);
+        }
     }
 
     if (env->mcg_cap) {
@@ -5025,12 +5052,15 @@ static int kvm_get_msrs(X86CPU *cpu)
             env->msr_fixed_ctr_ctrl = msrs[i].data;
             break;
         case MSR_CORE_PERF_GLOBAL_CTRL:
+        case MSR_AMD64_PERF_CNTR_GLOBAL_CTL:
             env->msr_global_ctrl = msrs[i].data;
             break;
         case MSR_CORE_PERF_GLOBAL_STATUS:
+        case MSR_AMD64_PERF_CNTR_GLOBAL_STATUS:
             env->msr_global_status = msrs[i].data;
             break;
         case MSR_CORE_PERF_GLOBAL_OVF_CTRL:
+        case MSR_AMD64_PERF_CNTR_GLOBAL_STATUS_CLR:
             env->msr_global_ovf_ctrl = msrs[i].data;
             break;
         case MSR_CORE_PERF_FIXED_CTR0 ... MSR_CORE_PERF_FIXED_CTR0 + MAX_FIXED_COUNTERS - 1:
-- 
2.43.5