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[Bug 1860575] Re: qemu64 CPU model is incorrect
From: |
The Lemon Man |
Subject: |
[Bug 1860575] Re: qemu64 CPU model is incorrect |
Date: |
Wed, 22 Jan 2020 16:36:57 -0000 |
The error message is a rather cryptic "LLVM ERROR: 64-bit code requested on a
subtarget
that doesn't support it!" as it knows Athlon CPUs don't support the AMD64 ISA.
I will relay the tip to the people managing the VMs, I guess this problem went
unnoticed
for so long because there are not many `qemu64` users.
I'm available to test a patch whenever it becomes available, I didn't directly
send one
because I was afraid of breaking the backward compatibility and some (many?)
VMs.
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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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