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src/hotspot/cpu/x86/vm_version_x86.cpp

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@@ -1669,27 +1669,24 @@
   } else if (vrt == HyperV) {
     st->print_cr("HyperV virtualization detected");
   }
 }
 
-void VM_Version::check_virt_cpuid(uint32_t idx, uint32_t *regs) {
-// TODO support 32 bit
-#if defined(_LP64)
-#if defined(_MSC_VER)
+void VM_Version::check_virt_cpuid(uint32_t *regs) {
   // Allocate space for the code
   const int code_size = 100;
   ResourceMark rm;
   CodeBuffer cb("detect_virt", code_size, 0);
   MacroAssembler* a = new MacroAssembler(&cb);
   address code = a->pc();
-  void (*test)(uint32_t idx, uint32_t *regs) = (void(*)(uint32_t idx, uint32_t *regs))code;
+  void (*test)(uint32_t *regs) = (void(*)(uint32_t *regs))code;
 
   a->movq(r9, rbx); // save nonvolatile register
 
   // next line would not work on 32-bit
-  a->movq(rax, c_rarg0 /* rcx */);
-  a->movq(r8, c_rarg1 /* rdx */);
+  a->movl(rax, 0x40000000);
+  a->movptr(r8, c_rarg0 /* rcx */);
   a->cpuid();
   a->movl(Address(r8,  0), rax);
   a->movl(Address(r8,  4), rbx);
   a->movl(Address(r8,  8), rcx);
   a->movl(Address(r8, 12), rdx);

@@ -1699,23 +1696,11 @@
 
   uint32_t *code_end = (uint32_t *)a->pc();
   a->flush();
 
   // execute code
-  (*test)(idx, regs);
-#elif defined(__GNUC__)
-  __asm__ volatile (
-     "        cpuid;"
-     "        mov %%eax,(%1);"
-     "        mov %%ebx,4(%1);"
-     "        mov %%ecx,8(%1);"
-     "        mov %%edx,12(%1);"
-     : "+a" (idx)
-     : "S" (regs)
-     : "ebx", "ecx", "edx", "memory" );
-#endif
-#endif
+  (*test)(regs);
 }
 
 
 bool VM_Version::use_biased_locking() {
 #if INCLUDE_RTM_OPT

@@ -1815,43 +1800,33 @@
 //
 // more information :
 // https://kb.vmware.com/s/article/1009458
 //
 void VM_Version::check_virtualizations() {
-#if defined(_LP64)
-  uint32_t registers[4];
-  char signature[13];
-  uint32_t base;
-  signature[12] = '\0';
-  memset((void*)registers, 0, 4*sizeof(uint32_t));
-
-  for (base = 0x40000000; base < 0x40010000; base += 0x100) {
-    check_virt_cpuid(base, registers);
-
-    *(uint32_t *)(signature + 0) = registers[1];
-    *(uint32_t *)(signature + 4) = registers[2];
-    *(uint32_t *)(signature + 8) = registers[3];
+  uint32_t registers[4] = {0};
+  char signature[13] = {0};
+
+  check_virt_cpuid(registers);
+  memcpy(signature, &registers[1], 12);
 
     if (strncmp("VMwareVMware", signature, 12) == 0) {
       Abstract_VM_Version::_detected_virtualization = VMWare;
       // check for extended metrics from guestlib
       VirtualizationSupport::initialize();
-    }
-
-    if (strncmp("Microsoft Hv", signature, 12) == 0) {
+  } else if (strncmp("Microsoft Hv", signature, 12) == 0) {
+#ifdef _WINDOWS
+    if (is_in_VM()) {
       Abstract_VM_Version::_detected_virtualization = HyperV;
     }
-
-    if (strncmp("KVMKVMKVM", signature, 9) == 0) {
+#else
+    Abstract_VM_Version::_detected_virtualization = HyperV;
+#endif
+  } else if (strncmp("KVMKVMKVM", signature, 9) == 0) {
       Abstract_VM_Version::_detected_virtualization = KVM;
-    }
-
-    if (strncmp("XenVMMXenVMM", signature, 12) == 0) {
+  } else if (strncmp("XenVMMXenVMM", signature, 12) == 0) {
       Abstract_VM_Version::_detected_virtualization = XenHVM;
     }
-  }
-#endif
 }
 
 void VM_Version::initialize() {
   ResourceMark rm;
   // Making this stub must be FIRST use of assembler

@@ -1867,9 +1842,9 @@
 
   get_processor_features();
 
   LP64_ONLY(Assembler::precompute_instructions();)
 
-  if (cpu_family() > 4) { // it supports CPUID
+  if (VM_Version::supports_hv()) { // Supports hypervisor
     check_virtualizations();
   }
 }
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