[RFC,v2,07/19] i386: move hyperv_limits initialization to x86_cpu_realizefn()

Commit Message

Vitaly Kuznetsov Sept. 30, 2020, 1:40 p.m. UTC

As a preparation to expanding Hyper-V CPU features early, move
hyperv_limits initialization to x86_cpu_realizefn().

Signed-off-by: Vitaly Kuznetsov <[e-mail]>
---
 target/i386/cpu.c |  5 +++++
 target/i386/cpu.h |  1 +
 target/i386/kvm.c | 13 ++++++++++++-
 3 files changed, 18 insertions(+), 1 deletion(-)

Patch

diff --git a/target/i386/cpu.c b/target/i386/cpu.c
index 99bcfcbb448a..d657590ab55d 100644
--- a/target/i386/cpu.c
+++ b/target/i386/cpu.c
@@ -6515,6 +6515,11 @@  static void x86_cpu_hyperv_realize(X86CPU *cpu)
     /* Hypervisor system identity */
     cpu->hyperv_version_id[0] = 0x00001bbc;
     cpu->hyperv_version_id[1] = 0x00060001;
+
+    /* Hypervisor implementation limits */
+    cpu->hyperv_limits[0] = 64;
+    cpu->hyperv_limits[1] = 0;
+    cpu->hyperv_limits[2] = 0;
 }
 
 static void x86_cpu_realizefn(DeviceState *dev, Error **errp)
diff --git a/target/i386/cpu.h b/target/i386/cpu.h
index 077c19c5642b..187e4a09e65d 100644
--- a/target/i386/cpu.h
+++ b/target/i386/cpu.h
@@ -1662,6 +1662,7 @@  struct X86CPU {
     uint32_t hyperv_vendor_id[3];
     uint32_t hyperv_interface_id[4];
     uint32_t hyperv_version_id[4];
+    uint32_t hyperv_limits[3];
 
     bool check_cpuid;
     bool enforce_cpuid;
diff --git a/target/i386/kvm.c b/target/i386/kvm.c
index b335b3a3d1c7..afddc9a4a260 100644
--- a/target/i386/kvm.c
+++ b/target/i386/kvm.c
@@ -1253,6 +1253,15 @@  static int hyperv_handle_properties(CPUState *cs,
             env->features[FEAT_HYPERV_EBX] = c->ebx;
             env->features[FEAT_HYPERV_EDX] = c->edx;
         }
+
+        c = cpuid_find_entry(cpuid, HV_CPUID_IMPLEMENT_LIMITS, 0);
+        if (c) {
+            cpu->hv_max_vps = c->eax;
+            cpu->hyperv_limits[0] = c->ebx;
+            cpu->hyperv_limits[1] = c->ecx;
+            cpu->hyperv_limits[2] = c->edx;
+        }
+
         c = cpuid_find_entry(cpuid, HV_CPUID_ENLIGHTMENT_INFO, 0);
         if (c) {
             env->features[FEAT_HV_RECOMM_EAX] = c->eax;
@@ -1355,7 +1364,9 @@  static int hyperv_handle_properties(CPUState *cs,
     c = &cpuid_ent[cpuid_i++];
     c->function = HV_CPUID_IMPLEMENT_LIMITS;
     c->eax = cpu->hv_max_vps;
-    c->ebx = 0x40;
+    c->ebx = cpu->hyperv_limits[0];
+    c->ecx = cpu->hyperv_limits[1];
+    c->edx = cpu->hyperv_limits[2];
 
     if (hyperv_feat_enabled(cpu, HYPERV_FEAT_EVMCS)) {
         __u32 function;