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a=ed25519-sha256; c=relaxed/relaxed; t=1792687381; s=strato-dkim-0003; d=xenosoft.de; h=In-Reply-To:Date:Message-ID:References:Cc:To:From:Subject:Cc:Date: From:Subject:Sender; bh=0YdO2+DcsvlJkeDUFu6+x7RRjGowhqUMvLmexnjMxzY=; b=HsyNE2BhoLKPDlVKI29Zv+Sm/0U80JF7QIu6g80w8cy0/maGXC+TkGtllNonZwHJrx /KnZTC7UhRDjK6iKQ0Dw== X-RZG-AUTH: ":L2QefEenb+UdBJSdRCXu93KJ1bmSGnhMdmOod1DhGN0rBVhd9dFr4thIFiqT9BURIS+l7Bng" Received: from void-ppc.a-eon.tld by smtp.strato.de (RZmta 55.6.3 DYNA|AUTH) with ESMTPSA id e825d929MGh0XeP (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256 bits)) (Client did not present a certificate); Thu, 22 Oct 2026 18:43:00 +0200 (CEST) Subject: Re: [PATCH 0/2] KVM: PPC: BookE: Fix boot hang on preemptible kernels From: Christian Zigotzky To: Shrikanth Hegde , maddy@linux.ibm.com, linuxppc-dev@lists.ozlabs.org Cc: mpe@ellerman.id.au, npiggin@gmail.com, christophe.leroy@csgroup.eu, linux-kernel@vger.kernel.org, msuchanek@suse.de, ritesh.list@gmail.com, harshpb@linux.ibm.com, gautam@linux.ibm.com, amachhiw@linux.ibm.com, venkat88@linux.ibm.com, nnmlinux@linux.ibm.com, "R.T.Dickinson" , mad skateman , Damien Stewart , Christian Zigotzky References: <20260928110411.844582-1-sshegde@linux.ibm.com> <754bfea0-5f8f-ba20-cf48-9c6131f98b49@xenosoft.de> Organization: A-EON Open Source Message-ID: <9a77eaff-4c60-52a8-7e87-0d2f34099b92@xenosoft.de> Date: Thu, 22 Oct 2026 18:42:59 +0200 X-Mailer: BrassMonkey/35.0.2 X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list MIME-Version: 1.0 In-Reply-To: <754bfea0-5f8f-ba20-cf48-9c6131f98b49@xenosoft.de> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit On 29/09/26 17:51, Christian Zigotzky wrote: > On 28/09/26 13:04, Shrikanth Hegde wrote: >> Christian Zigotzky had reported that preemptible kernels don't boot on >> his FSL Cyrus+ board. The board freezes on running either full/lazy >> preemption and has been an issue for a while now. >> >> https://lore.kernel.org/all/b897b0fd-90f2-4215-bcd4-3714e497d773@xenosoft.de/#t >> >> >> After 7.0, there is only preempt=full/lazy which removed the >> preempt=none/voluntary workaround used to mask the issue. There was >> challenge is getting the console logs which made the fixes difficult >> since >> one couldn't know where the issue is. >> >> Thanks to Michal for helping in getting the logs. That pointed at few >> places where the issue could be. This series is an attempt at fixing >> those. >> >> Christian, KVM team, >> Please *test* the patches. >> >> Shrikanth Hegde (2): >>    KVM: PPC: BookE: Disable preemption before loading guest FP and >>      Altivec >>    KVM: PPC: Replay pending interrupts before entering the guest >> >>   arch/powerpc/kvm/booke.c   |  9 ++++++++- >>   arch/powerpc/kvm/powerpc.c | 13 +++++++++++++ >>   2 files changed, 21 insertions(+), 1 deletion(-) >> > Hi, > > I was able to compile the RC5 of kernel 7.3 with your patches today. > :-) [1] > > After that I successfully tested it with KVM PR and KVM HV on my > PowerPC machines. > > Tested-by: Christian Zigotzky > > Many thanks for your help, > > Christian > > > [1] https://github.com/chzigotzky/kernels/releases/tag/v7.3.0-rc5-2 > > Hi, is it possible to add these patches to the kernel 7.4? Thanks, Christian -- Sent with BrassMonkey 35.0.2 (https://github.com/chzigotzky/Web-Browsers-and-Suites-for-Linux-PPC/releases/tag/BrassMonkey_35.0.2)