From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([2001:4830:134:3::10]:35773) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1bk3Nh-0001LU-2L for qemu-devel@nongnu.org; Wed, 14 Sep 2016 02:09:14 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1bk3Ng-0006Vv-6k for qemu-devel@nongnu.org; Wed, 14 Sep 2016 02:09:12 -0400 From: Wei Huang Date: Wed, 14 Sep 2016 02:09:01 -0400 Message-Id: <1473833343-31531-1-git-send-email-wei@redhat.com> Subject: [Qemu-devel] [PATCH V2 0/2] Add option to configure guest vPMU List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: qemu-arm@nongnu.org Cc: qemu-devel@nongnu.org, peter.maydell@linaro.org, drjones@redhat.com, shannon.zhao@linaro.org, abologna@redhat.com This patchset adds a pmu=[on/off] option to enable/disable vPMU support for guest VM. There are several reasons to justify this option. First, vPMU can be problematic for cross-migration between different SoC as perf counters are architecture-dependent. It is more flexible to have an option to turn it on/off. Secondly Secondly this option matches the "pmu" option as supported in libvirt. To make sure backward compatible, a PMU property is added to mach-virt machine types. V1->V2: * keep the original field name as "has_pmu" * add a warning message when PMU is turned on without KVM * use the feature bit to check PMU availability, instead of using has_pmu * add PMU compat support to mach-virt machine type RFC->V1: * set default pmu=off * change struct ARMCPU field name "has_pmu" ==> "has_host_pmu" * like el3, add a new feature ARM_FEATURE_HOST_PMU * "pmu" property becomes CPU dependent. Only cortex-a53/cortex-a57/host running on kvm supports this option. -Wei Wei Huang (2): arm64: Add an option to turn on/off vPMU support arm: virt: add PMU property to machvirt machine type hw/arm/virt-acpi-build.c | 2 +- hw/arm/virt.c | 14 +++++++++++++- target-arm/cpu.c | 22 ++++++++++++++++++++++ target-arm/cpu.h | 1 + target-arm/cpu64.c | 2 ++ target-arm/kvm64.c | 17 +++++++++++++---- 6 files changed, 52 insertions(+), 6 deletions(-) -- 1.8.3.1