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Tue, 17 Feb 2026 11:26:31 +0100 (CET) Message-ID: <2a27e6fc-7eb4-41a5-ba88-58f6a22625b5@xenosoft.de> Date: Tue, 17 Feb 2026 11:26:30 +0100 X-Mailing-List: linuxppc-dev@lists.ozlabs.org List-Id: List-Help: List-Owner: List-Post: List-Archive: , List-Subscribe: , , List-Unsubscribe: Precedence: list MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: [Linux PPC] KVM PR and KVM HV do not work if the kernel was compiled with PREEMPT To: Madhavan Srinivasan , Shrikanth Hegde , linuxppc-dev , "kvm-ppc@vger.kernel.org" Cc: "R.T.Dickinson" , hypexed@yahoo.com.au, mad skateman , Christian Zigotzky References: <185d7a42-f7b4-44e1-a129-f5989d211c74@linux.ibm.com> <40154f6a-39da-959d-e039-5ab9ff62db3c@xenosoft.de> <709b864f-9daa-4a48-b3d6-39baedce63b2@linux.ibm.com> <843b7c60-23f1-47d0-b4e8-2147c3e40c23@linux.ibm.com> Content-Language: de-DE From: Christian Zigotzky In-Reply-To: <843b7c60-23f1-47d0-b4e8-2147c3e40c23@linux.ibm.com> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit On 17/02/26 11:17 Madhavan Srinivasan wrote: > > On 2/17/26 3:14 PM, Christian Zigotzky wrote: >> On 17/02/26 10:03, Shrikanth Hegde wrote: >>> >>> >>> On 2/17/26 2:22 PM, Christian Zigotzky wrote: >>>> Hi, >>>> >>>> Thank you for your patch. I tested the latest git kernel with your >>>> patch today. Unfortunately the system freezes while booting the VM >>>> with KVM HV. >>>> >>>> Cheers, >>>> Christian >>>> >>>> >>> Would it be possible to share the console log or boot log of KVM to the >>> point it freezes? >> >> Unfortunately there aren't any error messages. >> >> I also tried it with: >> >> gdb --args qemu-system-ppc64 -M ppce500 -cpu e5500 -m 1024 -kernel >> uImage-7.0-preempt -drive >> format=raw,file=void-live-powerpc-20230317-updated2.img,index=0,if=virtio >> -netdev user,id=mynet0 -device virtio-net,netdev=mynet0 -append "rw >> root=/dev/vda" -device virtio-gpu-pci -device virtio-mouse-pci >> -device virtio-keyboard-pci -enable-kvm -smp 4 >> >> and with gdb in the guest: >> >> qemu-system-ppc64 -s -S -M ppce500 -cpu e5500 -m 1024 -kernel >> uImage-7.0-preempt -drive >> format=raw,file=void-live-powerpc-20230317-updated2.img,index=0,if=virtio >> -netdev user,id=mynet0 -device virtio-net,netdev=mynet0 -append "rw >> root=/dev/vda" -device virtio-gpu-pci -device virtio-mouse-pci >> -device virtio-keyboard-pci -enable-kvm -smp 4 >> >> The system freezed without any error messages. > can you please share the config. > I tried kvm-hv in my power8/power9 and seems to boot fine without any > issues with today's upstream > Maddy Here are the configs. With PREEMPT: https://github.com/chzigotzky/kernels/blob/d50d259ca63dd2b3b9a9eaabc82e5cc69c8cc9f0/configs/e5500_defconfig Without PREEMPT: https://github.com/chzigotzky/kernels/blob/main/configs/e5500_defconfig - Christian