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Re: [Qemu-devel] [PATCH] i386: Fix nested SVM on older Opterons

From: Bernhard M. Wiedemann
Subject: Re: [Qemu-devel] [PATCH] i386: Fix nested SVM on older Opterons
Date: Mon, 27 May 2019 09:49:49 +0200
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.6.1

On 23/05/2019 23.27, Eduardo Habkost wrote:
> On Thu, May 23, 2019 at 07:57:38PM +0100, Dr. David Alan Gilbert wrote:
>> * Bernhard M. Wiedemann (address@hidden) wrote:
>>> Without this patch, a VM on a Opteron G3 host will have the svm flag, but
>>> the kvm-amd module fails to load in there, complaining that it needs
>>> cpuid 0x8000000a
>>> I have successfully built and tested this for 3+ years in production
>>> on Opteron G3 servers.
> Have you reproduced the bug on QEMU 2.8 or newer?  The problem
> you describe should be fixed by the following commit (from ~2.5
> years ago).
> commit 0c3d7c0051576d220e6da0a8ac08f2d8482e2f0b
>     target-i386: Enable CPUID[0x8000000A] if SVM is enabled

I was still on qemu-2.6.2 so it is good to know that this might work out
of the box with 2.8+

Thanks for the pointer.

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