[Bug 1860575] [NEW] qemu64 CPU model is incorrect

[The Lemon Man]

Public bug reported:

At the moment the "qemu64" CPU is defined as follows:

```
        .vendor = CPUID_VENDOR_AMD,
        .family = 6,
        .model = 6,
        .stepping = 3,
```

According to Wikipedia [1] this means the CPU is defined as part of the
K7 family while the AMD64 ISA was only introduced with the K8 series!

This causes some software such as LLVM to notice the problem (32-bit cpu
with 64-bit capability reported in the cpuid flag) and produce various
error messages.

The simple solution would be to upgrade this definition to use the Sledgehammer
family (15) instead. 

[1] https://en.wikipedia.org/wiki/List_of_AMD_CPU_microarchitectures

** Affects: qemu
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1860575

Title:
  qemu64 CPU model is incorrect

Status in QEMU:
  New

Bug description:
  At the moment the "qemu64" CPU is defined as follows:

  ```
          .vendor = CPUID_VENDOR_AMD,
          .family = 6,
          .model = 6,
          .stepping = 3,
  ```

  According to Wikipedia [1] this means the CPU is defined as part of the
  K7 family while the AMD64 ISA was only introduced with the K8 series!

  This causes some software such as LLVM to notice the problem (32-bit cpu
  with 64-bit capability reported in the cpuid flag) and produce various
  error messages.

  The simple solution would be to upgrade this definition to use the 
Sledgehammer
  family (15) instead. 

  [1] https://en.wikipedia.org/wiki/List_of_AMD_CPU_microarchitectures

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