[Bug 1860575] Re: qemu64 CPU model is incorrect

[Daniel Berrange]

Your analysis of the problem with family makes sense & we do have
mechanism to fix this in QEMU while keeping back compat for existing
deployments.

I'm curious as to the actual errors LLVM reports ?

FWIW, even though qemu64 is the default CPU, practically everyone would
be better off choosing one of the other CPU models explicitly to better
suit their desired use case. There is some guidance here
https://qemu.weilnetz.de/doc/qemu-doc.html#cpu_005fmodels

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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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