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[84.0.120.1]) by smtp.gmail.com with ESMTPSA id f19sm196652wmh.44.2020.09.08.11.09.40 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 08 Sep 2020 11:09:41 -0700 (PDT) Date: Tue, 8 Sep 2020 20:09:39 +0200 From: Ingo Molnar To: Paolo Bonzini Cc: torvalds@linux-foundation.org, linux-kernel@vger.kernel.org, kvm@vger.kernel.org, Will Deacon Subject: Re: [GIT PULL] First batch of KVM changes for Linux 5.9 Message-ID: <20200908180939.GA2378263@gmail.com> References: <20200805182606.12621-1-pbonzini@redhat.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20200805182606.12621-1-pbonzini@redhat.com> Sender: kvm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org hi, * Paolo Bonzini wrote: > Paolo Bonzini (11): > Merge branch 'kvm-async-pf-int' into HEAD kvmtool broke in this merge window, hanging during bootup right after CPU bringup: [ 1.289404] #63 [ 0.012468] kvm-clock: cpu 63, msr 6ff69fc1, secondary cpu clock [ 0.012468] [Firmware Bug]: CPU63: APIC id mismatch. Firmware: 3f APIC: 14 [ 1.302320] kvm-guest: KVM setup async PF for cpu 63 [ 1.302320] kvm-guest: stealtime: cpu 63, msr 1379d7600 Eventually trigger an RCU stall warning: [ 22.302392] rcu: INFO: rcu_sched detected stalls on CPUs/tasks: [ 22.302392] rcu: 1-...!: (68 GPs behind) idle=00c/0/0x0 softirq=0/0 fqs=0 (false positive?) I've bisected this down to the above merge commit. The individual commit: b1d405751cd5: ("KVM: x86: Switch KVM guest to using interrupts for page ready APF delivery") appears to be working fine standalone. I'm using x86-64 defconfig+kvmconfig on SVM. Can send more info on request. The kvmtool.git commit I've tested is 90b2d3adadf2. Thanks, Ingo