On 8/15/16 04:31, Andrea Bolognani wrote: > > 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 :)
No, I haven't. All tests were done based on command line to QEMU. :-) -Wei > > -- > Andrea Bolognani / Red Hat / Virtualization >
