[Qemu-devel] [PATCH 10/14] hvf: refactor cpuid code

[Sergio Andres Gomez Del Real <sergio.g.delreal@gmail.com>]

This commit adds code to request the cpuid features supported by the
host and hvf; it calls hvf_get_supported_cpuid if hvf is compiled with
QEMU and enabled.

Signed-off-by: Sergio Andres Gomez Del Real <Sergio.G.DelReal@gmail.com>
---
 cpus.c                |   2 +
 include/qom/cpu.h     |   6 +--
 include/sysemu/hvf.h  |  18 ++++++---
 target/i386/cpu-qom.h |   4 +-
 target/i386/cpu.c     | 108 ++++++++++++++++++++++++++++++++++++++++----------
 target/i386/hvf-all.c |  20 +++++-----
 6 files changed, 113 insertions(+), 45 deletions(-)

diff --git a/cpus.c b/cpus.c
index 6754ce17cc..2411dfcd3f 100644
--- a/cpus.c
+++ b/cpus.c
@@ -37,7 +37,9 @@
 #include "sysemu/hw_accel.h"
 #include "sysemu/kvm.h"
 #include "sysemu/hax.h"
+#ifdef CONFIG_HVF
 #include "sysemu/hvf.h"
+#endif
 #include "qmp-commands.h"
 #include "exec/exec-all.h"
 
diff --git a/include/qom/cpu.h b/include/qom/cpu.h
index c46eb61240..ef74c2ce3c 100644
--- a/include/qom/cpu.h
+++ b/include/qom/cpu.h
@@ -408,13 +408,9 @@ struct CPUState {
      */
     uint16_t pending_tlb_flush;
 
-    // HVF
     bool hvf_vcpu_dirty;
     uint64_t hvf_fd; // fd of vcpu created by HVF
-    // Supporting data structures for VMCS capabilities
-    // and x86 emulation state
-    struct hvf_vcpu_caps* hvf_caps;
-    struct hvf_x86_state* hvf_x86;
+    struct hvf_x86_state *hvf_x86;
 };
 
 QTAILQ_HEAD(CPUTailQ, CPUState);
diff --git a/include/sysemu/hvf.h b/include/sysemu/hvf.h
index f9a5a9c5d3..5b92769b16 100644
--- a/include/sysemu/hvf.h
+++ b/include/sysemu/hvf.h
@@ -34,12 +34,6 @@ typedef struct hvf_slot {
     int slot_id;
 } hvf_slot;
 
-typedef struct HVFState {
-    AccelState parent;
-    hvf_slot slots[32];
-    int num_slots;
-} HVFState;
-
 struct hvf_vcpu_caps {
     uint64_t vmx_cap_pinbased;
     uint64_t vmx_cap_procbased;
@@ -49,6 +43,15 @@ struct hvf_vcpu_caps {
     uint64_t vmx_cap_preemption_timer;
 };
 
+typedef struct HVFState {
+    AccelState parent;
+    hvf_slot slots[32];
+    int num_slots;
+
+    struct hvf_vcpu_caps *hvf_caps;
+} HVFState;
+extern HVFState *hvf_state;
+
 void hvf_set_phys_mem(MemoryRegionSection *, bool);
 void hvf_handle_io(CPUArchState *, uint16_t, void *,
                   int, int, int);
@@ -87,6 +90,9 @@ void update_apic_tpr(CPUState *);
 int hvf_put_registers(CPUState *);
 void vmx_clear_int_window_exiting(CPUState *cpu);
 
+uint32_t hvf_get_supported_cpuid(uint32_t func, uint32_t idx,
+                                 int reg);
+
 #define TYPE_HVF_ACCEL ACCEL_CLASS_NAME("hvf")
 
 #define HVF_STATE(obj) \
diff --git a/target/i386/cpu-qom.h b/target/i386/cpu-qom.h
index c2205e6077..22f95eb3a4 100644
--- a/target/i386/cpu-qom.h
+++ b/target/i386/cpu-qom.h
@@ -47,7 +47,7 @@ typedef struct X86CPUDefinition X86CPUDefinition;
 /**
  * X86CPUClass:
  * @cpu_def: CPU model definition
- * @kvm_required: Whether CPU model requires KVM to be enabled.
+ * @host_cpuid_required: Whether CPU model requires cpuid from host.
  * @ordering: Ordering on the "-cpu help" CPU model list.
  * @migration_safe: See CpuDefinitionInfo::migration_safe
  * @static_model: See CpuDefinitionInfo::static
@@ -66,7 +66,7 @@ typedef struct X86CPUClass {
      */
     X86CPUDefinition *cpu_def;
 
-    bool kvm_required;
+    bool host_cpuid_required;
     int ordering;
     bool migration_safe;
     bool static_model;
diff --git a/target/i386/cpu.c b/target/i386/cpu.c
index ddc45abd70..8c531a0ffa 100644
--- a/target/i386/cpu.c
+++ b/target/i386/cpu.c
@@ -22,6 +22,9 @@
 #include "cpu.h"
 #include "exec/exec-all.h"
 #include "sysemu/kvm.h"
+#ifdef CONFIG_HVF
+#include "sysemu/hvf.h"
+#endif
 #include "sysemu/cpus.h"
 #include "kvm_i386.h"
 
@@ -613,6 +616,23 @@ static uint32_t xsave_area_size(uint64_t mask)
     return ret;
 }
 
+static inline bool accel_uses_host_cpuid(void)
+{
+    bool enabled;
+#if defined(CONFIG_KVM)
+    enabled = kvm_enabled();
+#elif defined(CONFIG_HVF)
+    enabled = hvf_enabled();
+#else
+    enabled = 0;
+#endif
+    if (enabled) {
+        return true;
+    } else {
+        return false;
+    }
+}
+
 static inline uint64_t x86_cpu_xsave_components(X86CPU *cpu)
 {
     return ((uint64_t)cpu->env.features[FEAT_XSAVE_COMP_HI]) << 32 |
@@ -1643,10 +1663,15 @@ static void max_x86_cpu_initfn(Object *obj)
      */
     cpu->max_features = true;
 
-    if (kvm_enabled()) {
+    if (accel_uses_host_cpuid()) {
         char vendor[CPUID_VENDOR_SZ + 1] = { 0 };
         char model_id[CPUID_MODEL_ID_SZ + 1] = { 0 };
         int family, model, stepping;
+        X86CPUDefinition host_cpudef = { };
+        uint32_t eax = 0, ebx = 0, ecx = 0, edx = 0;
+
+        host_cpuid(0x0, 0, &eax, &ebx, &ecx, &edx);
+        x86_cpu_vendor_words2str(host_cpudef.vendor, ebx, edx, ecx);
 
         host_vendor_fms(vendor, &family, &model, &stepping);
 
@@ -1660,12 +1685,23 @@ static void max_x86_cpu_initfn(Object *obj)
         object_property_set_str(OBJECT(cpu), model_id, "model-id",
                                 &error_abort);
 
-        env->cpuid_min_level =
-            kvm_arch_get_supported_cpuid(s, 0x0, 0, R_EAX);
-        env->cpuid_min_xlevel =
-            kvm_arch_get_supported_cpuid(s, 0x80000000, 0, R_EAX);
-        env->cpuid_min_xlevel2 =
-            kvm_arch_get_supported_cpuid(s, 0xC0000000, 0, R_EAX);
+        if (kvm_enabled()) {
+            env->cpuid_min_level =
+                kvm_arch_get_supported_cpuid(s, 0x0, 0, R_EAX);
+            env->cpuid_min_xlevel =
+                kvm_arch_get_supported_cpuid(s, 0x80000000, 0, R_EAX);
+            env->cpuid_min_xlevel2 =
+                kvm_arch_get_supported_cpuid(s, 0xC0000000, 0, R_EAX);
+        } else {
+#if defined(CONFIG_HVF)
+            env->cpuid_min_level =
+                hvf_get_supported_cpuid(0x0, 0, R_EAX);
+            env->cpuid_min_xlevel =
+                hvf_get_supported_cpuid(0x80000000, 0, R_EAX);
+            env->cpuid_min_xlevel2 =
+                hvf_get_supported_cpuid(0xC0000000, 0, R_EAX);
+#endif
+        }
 
         if (lmce_supported()) {
             object_property_set_bool(OBJECT(cpu), true, "lmce", &error_abort);
@@ -1691,18 +1727,25 @@ static const TypeInfo max_x86_cpu_type_info = {
     .class_init = max_x86_cpu_class_init,
 };
 
-#ifdef CONFIG_KVM
-
+#if defined(CONFIG_KVM) || defined(CONFIG_HVF)
 static void host_x86_cpu_class_init(ObjectClass *oc, void *data)
 {
     X86CPUClass *xcc = X86_CPU_CLASS(oc);
 
-    xcc->kvm_required = true;
+    xcc->host_cpuid_required = true;
     xcc->ordering = 8;
 
-    xcc->model_description =
-        "KVM processor with all supported host features "
-        "(only available in KVM mode)";
+#if defined(CONFIG_KVM)
+    if (kvm_enabled()) {
+        xcc->model_description =
+            "KVM processor with all supported host features ";
+    } 
+#elif defined(CONFIG_HVF)
+    if (hvf_enabled()) {
+        xcc->model_description =
+            "HVF processor with all supported host features ";
+    }
+#endif
 }
 
 static const TypeInfo host_x86_cpu_type_info = {
@@ -1724,7 +1767,7 @@ static void report_unavailable_features(FeatureWord w, uint32_t mask)
             assert(reg);
             fprintf(stderr, "warning: %s doesn't support requested feature: "
                 "CPUID.%02XH:%s%s%s [bit %d]\n",
-                kvm_enabled() ? "host" : "TCG",
+                accel_uses_host_cpuid() ? "host" : "TCG",
                 f->cpuid_eax, reg,
                 f->feat_names[i] ? "." : "",
                 f->feat_names[i] ? f->feat_names[i] : "", i);
@@ -2175,7 +2218,7 @@ static void x86_cpu_class_check_missing_features(X86CPUClass *xcc,
     Error *err = NULL;
     strList **next = missing_feats;
 
-    if (xcc->kvm_required && !kvm_enabled()) {
+    if (xcc->host_cpuid_required && !accel_uses_host_cpuid()) {
         strList *new = g_new0(strList, 1);
         new->value = g_strdup("kvm");;
         *missing_feats = new;
@@ -2337,7 +2380,15 @@ static uint32_t x86_cpu_get_supported_feature_word(FeatureWord w,
         r = kvm_arch_get_supported_cpuid(kvm_state, wi->cpuid_eax,
                                                     wi->cpuid_ecx,
                                                     wi->cpuid_reg);
-    } else if (tcg_enabled()) {
+    }
+#if defined(CONFIG_HVF)
+    else if (hvf_enabled()) {
+        r = hvf_get_supported_cpuid(wi->cpuid_eax,
+                                    wi->cpuid_ecx,
+                                    wi->cpuid_reg);
+    }
+#endif
+    else if (tcg_enabled()) {
         r = wi->tcg_features;
     } else {
         return ~0;
@@ -2396,6 +2447,7 @@ static void x86_cpu_load_def(X86CPU *cpu, X86CPUDefinition *def, Error **errp)
     }
 
     /* Special cases not set in the X86CPUDefinition structs: */
+    /* TODO: implement for hvf */
     if (kvm_enabled()) {
         if (!kvm_irqchip_in_kernel()) {
             x86_cpu_change_kvm_default("x2apic", "off");
@@ -2416,7 +2468,7 @@ static void x86_cpu_load_def(X86CPU *cpu, X86CPUDefinition *def, Error **errp)
      * when doing cross vendor migration
      */
     vendor = def->vendor;
-    if (kvm_enabled()) {
+    if (accel_uses_host_cpuid()) {
         uint32_t  ebx = 0, ecx = 0, edx = 0;
         host_cpuid(0, 0, NULL, &ebx, &ecx, &edx);
         x86_cpu_vendor_words2str(host_vendor, ebx, edx, ecx);
@@ -2872,7 +2924,16 @@ void cpu_x86_cpuid(CPUX86State *env, uint32_t index, uint32_t count,
             *ebx = kvm_arch_get_supported_cpuid(s, 0xA, count, R_EBX);
             *ecx = kvm_arch_get_supported_cpuid(s, 0xA, count, R_ECX);
             *edx = kvm_arch_get_supported_cpuid(s, 0xA, count, R_EDX);
-        } else {
+        }
+#if defined(CONFIG_HVF)
+        else if (hvf_enabled() && cpu->enable_pmu) {
+            *eax = hvf_get_supported_cpuid(0xA, count, R_EAX);
+            *ebx = hvf_get_supported_cpuid(0xA, count, R_EBX);
+            *ecx = hvf_get_supported_cpuid(0xA, count, R_ECX);
+            *edx = hvf_get_supported_cpuid(0xA, count, R_EDX);
+        }
+#endif
+        else {
             *eax = 0;
             *ebx = 0;
             *ecx = 0;
@@ -3220,6 +3281,7 @@ static void x86_cpu_reset(CPUState *s)
 
     s->halted = !cpu_is_bsp(cpu);
 
+    /* TODO: implement for hvf */
     if (kvm_enabled()) {
         kvm_arch_reset_vcpu(cpu);
     }
@@ -3262,6 +3324,7 @@ APICCommonClass *apic_get_class(void)
 {
     const char *apic_type = "apic";
 
+    /* TODO: implement for hvf */
     if (kvm_apic_in_kernel()) {
         apic_type = "kvm-apic";
     } else if (xen_enabled()) {
@@ -3492,6 +3555,7 @@ static void x86_cpu_expand_features(X86CPU *cpu, Error **errp)
         }
     }
 
+    /* TODO: implement for hvf */
     if (!kvm_enabled() || !cpu->expose_kvm) {
         env->features[FEAT_KVM] = 0;
     }
@@ -3575,7 +3639,7 @@ static void x86_cpu_realizefn(DeviceState *dev, Error **errp)
     Error *local_err = NULL;
     static bool ht_warned;
 
-    if (xcc->kvm_required && !kvm_enabled()) {
+    if (xcc->host_cpuid_required && !accel_uses_host_cpuid()) {
         char *name = x86_cpu_class_get_model_name(xcc);
         error_setg(&local_err, "CPU model '%s' requires KVM", name);
         g_free(name);
@@ -3597,7 +3661,7 @@ static void x86_cpu_realizefn(DeviceState *dev, Error **errp)
         x86_cpu_report_filtered_features(cpu);
         if (cpu->enforce_cpuid) {
             error_setg(&local_err,
-                       kvm_enabled() ?
+                       accel_uses_host_cpuid() ?
                            "Host doesn't support requested features" :
                            "TCG doesn't support requested features");
             goto out;
@@ -3620,7 +3684,7 @@ static void x86_cpu_realizefn(DeviceState *dev, Error **errp)
      * consumer AMD devices but nothing else.
      */
     if (env->features[FEAT_8000_0001_EDX] & CPUID_EXT2_LM) {
-        if (kvm_enabled()) {
+        if (accel_uses_host_cpuid()) {
             uint32_t host_phys_bits = x86_host_phys_bits();
             static bool warned;
 
@@ -4207,7 +4271,7 @@ static void x86_cpu_register_types(void)
     }
     type_register_static(&max_x86_cpu_type_info);
     type_register_static(&x86_base_cpu_type_info);
-#ifdef CONFIG_KVM
+#if defined(CONFIG_KVM) || defined(CONFIG_HVF)
     type_register_static(&host_x86_cpu_type_info);
 #endif
 }
diff --git a/target/i386/hvf-all.c b/target/i386/hvf-all.c
index 88b5281975..11d20671f7 100644
--- a/target/i386/hvf-all.c
+++ b/target/i386/hvf-all.c
@@ -604,7 +604,7 @@ int hvf_init_vcpu(CPUState *cpu)
     init_decoder(cpu);
     init_cpuid(cpu);
 
-    cpu->hvf_caps = (struct hvf_vcpu_caps *)g_malloc0(sizeof(struct hvf_vcpu_caps));
+    hvf_state->hvf_caps = (struct hvf_vcpu_caps *)g_malloc0(sizeof(struct hvf_vcpu_caps));
     cpu->hvf_x86 = (struct hvf_x86_state *)g_malloc0(sizeof(struct hvf_x86_state));
 
     r = hv_vcpu_create((hv_vcpuid_t *)&cpu->hvf_fd, HV_VCPU_DEFAULT);
@@ -612,37 +612,37 @@ int hvf_init_vcpu(CPUState *cpu)
     assert_hvf_ok(r);
 
     if (hv_vmx_read_capability(HV_VMX_CAP_PINBASED,
-        &cpu->hvf_caps->vmx_cap_pinbased)) {
+        &hvf_state->hvf_caps->vmx_cap_pinbased)) {
         abort();
     }
     if (hv_vmx_read_capability(HV_VMX_CAP_PROCBASED,
-        &cpu->hvf_caps->vmx_cap_procbased)) {
+        &hvf_state->hvf_caps->vmx_cap_procbased)) {
         abort();
     }
     if (hv_vmx_read_capability(HV_VMX_CAP_PROCBASED2,
-        &cpu->hvf_caps->vmx_cap_procbased2)) {
+        &hvf_state->hvf_caps->vmx_cap_procbased2)) {
         abort();
     }
     if (hv_vmx_read_capability(HV_VMX_CAP_ENTRY,
-        &cpu->hvf_caps->vmx_cap_entry)) {
+        &hvf_state->hvf_caps->vmx_cap_entry)) {
         abort();
     }
 
     /* set VMCS control fields */
     wvmcs(cpu->hvf_fd, VMCS_PIN_BASED_CTLS,
-          cap2ctrl(cpu->hvf_caps->vmx_cap_pinbased, 0));
+          cap2ctrl(hvf_state->hvf_caps->vmx_cap_pinbased, 0));
     wvmcs(cpu->hvf_fd, VMCS_PRI_PROC_BASED_CTLS,
-          cap2ctrl(cpu->hvf_caps->vmx_cap_procbased,
+          cap2ctrl(hvf_state->hvf_caps->vmx_cap_procbased,
           VMCS_PRI_PROC_BASED_CTLS_HLT |
           VMCS_PRI_PROC_BASED_CTLS_MWAIT |
           VMCS_PRI_PROC_BASED_CTLS_TSC_OFFSET |
           VMCS_PRI_PROC_BASED_CTLS_TPR_SHADOW) |
           VMCS_PRI_PROC_BASED_CTLS_SEC_CONTROL);
     wvmcs(cpu->hvf_fd, VMCS_SEC_PROC_BASED_CTLS,
-          cap2ctrl(cpu->hvf_caps->vmx_cap_procbased2,
+          cap2ctrl(hvf_state->hvf_caps->vmx_cap_procbased2,
                    VMCS_PRI_PROC_BASED2_CTLS_APIC_ACCESSES));
 
-    wvmcs(cpu->hvf_fd, VMCS_ENTRY_CTLS, cap2ctrl(cpu->hvf_caps->vmx_cap_entry,
+    wvmcs(cpu->hvf_fd, VMCS_ENTRY_CTLS, cap2ctrl(hvf_state->hvf_caps->vmx_cap_entry,
           0));
     wvmcs(cpu->hvf_fd, VMCS_EXCEPTION_BITMAP, 0); /* Double fault */
 
@@ -829,7 +829,7 @@ int hvf_vcpu_exec(CPUState *cpu)
             uint32_t rcx = (uint32_t)rreg(cpu->hvf_fd, HV_X86_RCX);
             uint32_t rdx = (uint32_t)rreg(cpu->hvf_fd, HV_X86_RDX);
 
-            cpu_x86_cpuid(cpu, rax, rcx, &rax, &rbx, &rcx, &rdx);
+            cpu_x86_cpuid(env, rax, rcx, &rax, &rbx, &rcx, &rdx);
 
             wreg(cpu->hvf_fd, HV_X86_RAX, rax);
             wreg(cpu->hvf_fd, HV_X86_RBX, rbx);
-- 
2.14.1