From mboxrd@z Thu Jan  1 00:00:00 1970
From: Christian Zigotzky <chzigotzky@xenosoft.de>
Date: Tue, 14 Sep 2021 15:59:13 +0000
Subject: Re: [PATCH 2/2] kvm: rename KVM_MAX_VCPU_ID to, KVM_MAX_VCPU_IDS
Message-Id: <6d3333b1-05cc-103b-4bdb-88bec5e3e9fd@xenosoft.de>
List-Id: <kvm-ppc.vger.kernel.org>
References: <20210913135745.13944-3-jgross@suse.com>
In-Reply-To: <20210913135745.13944-3-jgross@suse.com>
MIME-Version: 1.0
Content-Type: text/plain; charset="us-ascii"
Content-Transfer-Encoding: 7bit
To: Juergen Gross <jgross@suse.com>
Cc: x86@kernel.org, Wanpeng Li <wanpengli@tencent.com>, mad skateman <madskateman@gmail.com>, kvm@vger.kernel.org, linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, Darren Stevens <darren@stevens-zone.net>, Paul Mackerras <paulus@samba.org>, linux-kselftest@vger.kernel.org, "H. Peter Anvin" <hpa@zytor.com>, Shuah Khan <shuah@kernel.org>, Jonathan Corbet <corbet@lwn.net>, Joerg Roedel <joro@8bytes.org>, "Huacai Chen, " <chenhuacai@kernel.org>, "Aleksandar Markovic, " <aleksandar.qemu.devel@gmail.com>, Ingo Molnar <mingo@redhat.com>, "R.T.Dickinson" <rtd2@xtra.co.nz>, kvm-ppc@vger.kernel.org, Borislav Petkov <bp@alien8.de>, Shuah Khan <skhan@linuxfoundation.org>, Thomas Gleixner <tglx@linutronix.de>, Jim Mattson <jmattson@google.com>, "Thomas Bogendoerfer,
 " <tsbogend@alpha.franken.de>, linux-mips@vger.kernel.org, Paolo Bonzini <pbonzini@redhat.com>, "Vitaly, Kuznetsov" <vkuznets@redhat.com>, linuxppc-dev@lists.ozlabs.org

Hello Juergen,
Hello All,

Since the RC1 of kernel 5.13, -smp 2 and -smp 4 don't work with a 
virtual e5500 QEMU KVM-HV machine anymore. [1]
I see in the serial console, that the uImage doesn't load. I use the 
following QEMU command for booting:

qemu-system-ppc64 -M ppce500 -cpu e5500 -enable-kvm -m 1024 -kernel 
uImage -drive format=raw,file=MintPPC32-X5000.img,index=0,if=virtio 
-netdev user,id=mynet0 -device virtio-net,netdev=mynet0 -append "rw 
root=/dev/vda" -device virtio-vga -device virtio-mouse-pci -device 
virtio-keyboard-pci -device pci-ohci,id=newusb -device 
usb-audio,bus=newusb.0 -smp 4

The kernels boot without KVM-HV.

Summary for KVM-HV:

-smp 1 -> works
-smp 2 -> doesn't work
-smp 3 -> works
-smp 4 -> doesn't work

I used -smp 4 before the RC1 of kernel 5.13 because my FSL P5040 BookE 
machine [2] has 4 cores.

Does this patch solve this issue? [3]

Thanks,
Christian

[1] https://lists.ozlabs.org/pipermail/linuxppc-dev/2021-May/229103.html
[2] http://wiki.amiga.org/index.php?title=X5000
[3] 
https://lists.ozlabs.org/pipermail/linuxppc-dev/2021-September/234152.html