linux-kernel - Re: [PATCH 2/2] kvm: rename KVM_MAX_VCPU_ID to, KVM_MAX_VCPU

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Date:   Tue, 14 Sep 2021 17:59:13 +0200
From:   Christian Zigotzky <chzigotzky@...osoft.de>
To:     Juergen Gross <jgross@...e.com>
Cc:     kvm@...r.kernel.org, x86@...nel.org, linux-doc@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-mips@...r.kernel.org,
        kvm-ppc@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org,
        linux-kselftest@...r.kernel.org,
        Paolo Bonzini <pbonzini@...hat.com>,
        Jonathan Corbet <corbet@....net>,
        "Huacai Chen," <chenhuacai@...nel.org>,
        "Aleksandar Markovic," <aleksandar.qemu.devel@...il.com>,
        "Thomas Bogendoerfer," <tsbogend@...ha.franken.de>,
        Paul Mackerras <paulus@...abs.org>,
        Michael Ellerman <mpe@...erman.id.au>,
        "Benjamin Herrenschmidt," <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>,
        "Vitaly, Kuznetsov" <vkuznets@...hat.com>,
        Wanpeng Li <wanpengli@...cent.com>,
        Jim Mattson <jmattson@...gle.com>,
        Joerg Roedel <joro@...tes.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        "H. Peter Anvin" <hpa@...or.com>, Shuah Khan <shuah@...nel.org>,
        Shuah Khan <skhan@...uxfoundation.org>,
        "R.T.Dickinson" <rtd2@...a.co.nz>,
        Darren Stevens <darren@...vens-zone.net>,
        mad skateman <madskateman@...il.com>
Subject: Re: [PATCH 2/2] kvm: rename KVM_MAX_VCPU_ID to, KVM_MAX_VCPU_IDS

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