On 29 July 2016 at 16:08, Wei Huang <w...@redhat.com> wrote: > > > On 07/29/2016 02:57 AM, Peter Maydell wrote: >> On 28 July 2016 at 17:38, Wei Huang <w...@redhat.com> wrote: >>> This patch adds a pmu=[on/off] option to enable/disable vpmu support >>> in guest vm. There are several reasons to justify this option. First >>> vpmu can be problematic for cross-migration between different SoC as >>> perf counters is architecture-dependent. It is more flexible to >>> have an option to turn it on/off. Secondly it matches the -cpu pmu >>> option in libivrt. This patch has been tested on both DT/ACPI modes. >> >> >> What particular two systems are you trying to migrate between? > > One example: APM's Mustang has 5 perf counters while AMD's Seattle has 7 > counters.
Right; this is a cross-implementation migration, which isn't supposed to work at the moment, and more will be required for it to work than just pmu on/off. thanks -- PMM
