Re: [Qemu-devel] [PATCH V8 0/2] Add option to configure guest vPMU

2016-10-28 Thread Peter Maydell
On 27 October 2016 at 21:53, Wei Huang wrote: > On 10/27/2016 12:15 PM, Peter Maydell wrote: >> Right, but at the moment the commit message says there's no >> PMU in TCG at all. What's missing that causes there not to be one? >> (I think maybe we just don't report it in the feature register, >> wh

Re: [Qemu-devel] [PATCH V8 0/2] Add option to configure guest vPMU

2016-10-27 Thread Wei Huang
On 10/27/2016 12:15 PM, Peter Maydell wrote: > On 27 October 2016 at 18:06, Wei Huang wrote: >> >> >> On 10/27/2016 09:28 AM, Peter Maydell wrote: >>> On 26 October 2016 at 07:28, Wei Huang wrote: This patchset adds a pmu=[on/off] option to enable/disable vPMU support for guest VM. Th

Re: [Qemu-devel] [PATCH V8 0/2] Add option to configure guest vPMU

2016-10-27 Thread Wei Huang
On 10/27/2016 09:28 AM, Peter Maydell wrote: > On 26 October 2016 at 07:28, Wei Huang wrote: >> 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

Re: [Qemu-devel] [PATCH V8 0/2] Add option to configure guest vPMU

2016-10-27 Thread Peter Maydell
On 27 October 2016 at 18:06, Wei Huang wrote: > > > On 10/27/2016 09:28 AM, Peter Maydell wrote: >> On 26 October 2016 at 07:28, Wei Huang wrote: >>> 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,

Re: [Qemu-devel] [PATCH V8 0/2] Add option to configure guest vPMU

2016-10-27 Thread Peter Maydell
On 26 October 2016 at 07:28, Wei Huang wrote: > 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-d

[Qemu-devel] [PATCH V8 0/2] Add option to configure guest vPMU

2016-10-25 Thread Wei Huang
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 tur