Patchwork [v5,03/17] target-i386: Add Hypervisor level.

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Submitter Don Slutz
Date Sept. 22, 2012, 12:13 a.m.
Message ID <>
Download mbox | patch
Permalink /patch/186014/
State New
Headers show


Don Slutz - Sept. 22, 2012, 12:13 a.m.
Also known as Paravirtualization level or maximim cpuid function present in this leaf.
This is just the EAX value for 0x40000000.

QEMU knows this is KVM_CPUID_SIGNATURE (0x40000000).

This is based on:

Microsoft Hypervisor CPUID Leaves:

Linux kernel change starts with:

VMware documention on CPUIDs (Mechanisms to determine if software is
running in a VMware virtual machine):

QEMU has the value HYPERV_CPUID_MIN defined.

Signed-off-by: Don Slutz <>
 target-i386/cpu.h |    3 +++
 1 files changed, 3 insertions(+), 0 deletions(-)


diff --git a/target-i386/cpu.h b/target-i386/cpu.h
index 5265c5a..1899f69 100644
--- a/target-i386/cpu.h
+++ b/target-i386/cpu.h
@@ -777,11 +777,14 @@  typedef struct CPUX86State {
     uint32_t cpuid_ext3_features;
     uint32_t cpuid_apic_id;
     bool cpuid_vendor_override;
+    bool cpuid_hv_level_set;
     /* Store the results of Centaur's CPUID instructions */
     uint32_t cpuid_xlevel2;
     uint32_t cpuid_ext4_features;
     /* Flags from CPUID[EAX=7,ECX=0].EBX */
     uint32_t cpuid_7_0_ebx;
+    /* Hypervisor CPUIDs */
+    uint32_t cpuid_hv_level;
     /* MTRRs */
     uint64_t mtrr_fixed[11];