Re: [Qemu-devel] [PATCH v2 1/1] target-i386: Correct family/model/stepping for Opteron_G3

[Eduardo Habkost]

On Mon, Oct 03, 2016 at 02:50:02PM +0300, Denis V. Lunev wrote:
> From: Evgeny Yakovlev <address@hidden>
> 
> Current CPU definition for AMD Opteron third generation includes
> features like SSE4a and LAHF_LM support in emulated CPUID. These
> features are present in K8 rev.E or K10 CPUs and later. However,
> current G3 family and model describe 2nd generation K8 cores instead.
> 
> This is incorrect but was considered harmless until our tests found a
> problem with linux kernels >= 3.10 (and maybe earlier) which specifically
> check for Opteron K8 model when parsing CPUID leaf 0x80000001:
> http://lxr.free-electrons.com/source/arch/x86/kernel/cpu/amd.c?v=3.16#L552
> This code will disable LAHF_LM feature in /proc/cpuinfo if model number
> is inconsistent.
> 
> This change sets Opteron_G3 family/model/stepping to 16/2/3 which is
> a proper Opteron 3rd generation 2350 CPU.
> 
> Signed-off-by: Evgeny Yakovlev <address@hidden>
> Signed-off-by: Denis V. Lunev <address@hidden>
> CC: Paolo Bonzini <address@hidden>
> CC: Richard Henderson <address@hidden>
> CC: Eduardo Habkost <address@hidden>

Applied to x86-next. Thanks.

-- 
Eduardo