From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([2001:4830:134:3::10]:50004) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1fOfva-0007rR-6s for qemu-devel@nongnu.org; Fri, 01 Jun 2018 05:00:55 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1fOfvV-0008CY-Bw for qemu-devel@nongnu.org; Fri, 01 Jun 2018 05:00:54 -0400 Received: from indium.canonical.com ([91.189.90.7]:34768) by eggs.gnu.org with esmtps (TLS1.0:RSA_AES_128_CBC_SHA1:16) (Exim 4.71) (envelope-from ) id 1fOfvV-0008C0-4f for qemu-devel@nongnu.org; Fri, 01 Jun 2018 05:00:49 -0400 Received: from loganberry.canonical.com ([91.189.90.37]) by indium.canonical.com with esmtp (Exim 4.86_2 #2 (Debian)) id 1fOfvU-0007d3-1l for ; Fri, 01 Jun 2018 09:00:48 +0000 Received: from loganberry.canonical.com (localhost [127.0.0.1]) by loganberry.canonical.com (Postfix) with ESMTP id 0A5742E80C8 for ; Fri, 1 Jun 2018 09:00:48 +0000 (UTC) MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Date: Fri, 01 Jun 2018 08:45:36 -0000 From: Satheesh Rajendran Reply-To: Bug 1774605 <1774605@bugs.launchpad.net> Sender: bounces@canonical.com Message-Id: <152784273656.31479.153660947051184788.malonedeb@soybean.canonical.com> Errors-To: bounces@canonical.com Subject: [Qemu-devel] [Bug 1774605] [NEW] PowerPC guest does not emulate L2 and L3 cache for KVM vCPUs List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: qemu-devel@nongnu.org Public bug reported: PowerPC KVM guest does not emulate L2 and L2 caches for vCPU, it would be good to have them enabled if not any known issues/limitation already with PowerPC. Host Env: kernel: 4.17.0-rc7-00045-g0512e0134582 qemu: v2.12.0-923-gc181ddaa17-dirty #libvirtd -V libvirtd (libvirt) 4.4.0 Guest Kernel: # uname -a Linux atest-guest 4.17.0-rc7-00045-g0512e0134582 #9 SMP Fri Jun 1 02:55:50 = EDT 2018 ppc64le ppc64le ppc64le GNU/Linux Guest: # lscpu Architecture: ppc64le Byte Order: Little Endian CPU(s): 16 On-line CPU(s) list: 0-15 Thread(s) per core: 8 Core(s) per socket: 2 Socket(s): 1 NUMA node(s): 1 Model: 2.1 (pvr 004b 0201) Model name: POWER8 (architected), altivec supported Hypervisor vendor: KVM Virtualization type: para L1d cache: 64K L1i cache: 32K NUMA node0 CPU(s): 0-15 background: x86 enabling cpu L2 cache bydefault and L3 cache on demand for = kvm guest and claims performance improvement as vcpus can be = benefited with lesser `vmexits due to guest send IPIs.` with L3 cache enabl= ed, below was patch for same. https://git.qemu.org/?p=3Dqemu.git;a=3Dcommit;h=3D14c985cffa6cb177fc01a163d= 8bcf227c104718c ** Affects: qemu Importance: Undecided Status: New -- = You received this bug notification because you are a member of qemu- devel-ml, which is subscribed to QEMU. https://bugs.launchpad.net/bugs/1774605 Title: PowerPC guest does not emulate L2 and L3 cache for KVM vCPUs Status in QEMU: New Bug description: PowerPC KVM guest does not emulate L2 and L2 caches for vCPU, it would be good to have them enabled if not any known issues/limitation already with PowerPC. Host Env: kernel: 4.17.0-rc7-00045-g0512e0134582 qemu: v2.12.0-923-gc181ddaa17-dirty #libvirtd -V libvirtd (libvirt) 4.4.0 = Guest Kernel: # uname -a Linux atest-guest 4.17.0-rc7-00045-g0512e0134582 #9 SMP Fri Jun 1 02:55:5= 0 EDT 2018 ppc64le ppc64le ppc64le GNU/Linux Guest: # lscpu Architecture: ppc64le Byte Order: Little Endian CPU(s): 16 On-line CPU(s) list: 0-15 Thread(s) per core: 8 Core(s) per socket: 2 Socket(s): 1 NUMA node(s): 1 Model: 2.1 (pvr 004b 0201) Model name: POWER8 (architected), altivec supported Hypervisor vendor: KVM Virtualization type: para L1d cache: 64K L1i cache: 32K NUMA node0 CPU(s): 0-15 background: x86 enabling cpu L2 cache bydefault and L3 cache on demand fo= r kvm guest and claims performance improvement as vcpus can be = benefited with lesser `vmexits due to guest send IPIs.` with L3 cache ena= bled, below was patch for same. https://git.qemu.org/?p=3Dqemu.git;a=3Dcommit;h=3D14c985cffa6cb177fc01a16= 3d8bcf227c104718c To manage notifications about this bug go to: https://bugs.launchpad.net/qemu/+bug/1774605/+subscriptions