On Sat, 2016-08-13 at 00:52 -0500, Wei Huang wrote: > This patch adds a pmu=[on/off] option to enable/disable host vPMU > support in guest VM. There are several reasons to justify this option. > First, host-backed 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 this option > matches the "pmu" option as supported in libvirt tool. > > Note that, like "has_el3", the "pmu" option is only made available on > CPUs that support host-backed vPMU. They include: > * cortex-a53 + kvm > * cortex-a57 + kvm > * host + kvm > This option is removed in other configs where it doesn't make sense > (e.g. cortex-a57 + TCG); and the default pmu support is off. This patch > has been tested under both DT/ACPI modes. > > Signed-off-by: Wei Huang <w...@redhat.com> > --- > hw/arm/virt-acpi-build.c | 2 +- > hw/arm/virt.c | 2 +- > target-arm/cpu.c | 13 +++++++++++++ > target-arm/cpu.h | 3 ++- > target-arm/cpu64.c | 6 ++++++ > target-arm/kvm64.c | 10 +++++----- > 6 files changed, 28 insertions(+), 8 deletions(-)
Did you already try driving this with libvirt? It should work out of the box. If you haven't, I will do it :) -- Andrea Bolognani / Red Hat / Virtualization
