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i386: use better matching family/model/stepping for 'max' CPU

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The 'max' CPU under TCG currently reports a family/model/stepping that
approximately corresponds to an AMD K7 vintage architecture.
The K7 series predates the introduction of 64-bit support by AMD
in the K8 series. This has been reported to lead to LLVM complaints
about generating 64-bit code for a 32-bit CPU target

  LLVM ERROR: 64-bit code requested on a subtarget that doesn't support it!

It appears LLVM looks at the family/model/stepping, despite qemu64
reporting it is 64-bit capable.

This patch changes 'max' to report a CPUID with the family, model
and stepping taken from a

 AMD Athlon(tm) 64 X2 Dual Core Processor 4000+

which is one of the first 64-bit AMD CPUs.

Closes https://gitlab.com/qemu-project/qemu/-/issues/191

Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>
Message-Id: <20210507133650.645526-3-berrange@redhat.com>
Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>
This commit is contained in:
Daniel P. Berrangé 2021-05-07 14:36:50 +01:00 committed by Eduardo Habkost
parent b7c290177c
commit 40b3cc354a
1 changed files with 6 additions and 0 deletions
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6
target/i386/cpu.c
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@ -4285,9 +4285,15 @@ static void max_x86_cpu_initfn(Object *obj)
*/
object_property_set_str(OBJECT(cpu), "vendor", CPUID_VENDOR_AMD,
&error_abort);
#ifdef TARGET_X86_64
object_property_set_int(OBJECT(cpu), "family", 15, &error_abort);
object_property_set_int(OBJECT(cpu), "model", 107, &error_abort);
object_property_set_int(OBJECT(cpu), "stepping", 1, &error_abort);
#else
object_property_set_int(OBJECT(cpu), "family", 6, &error_abort);
object_property_set_int(OBJECT(cpu), "model", 6, &error_abort);
object_property_set_int(OBJECT(cpu), "stepping", 3, &error_abort);
#endif
object_property_set_str(OBJECT(cpu), "model-id",
"QEMU TCG CPU version " QEMU_HW_VERSION,
&error_abort);