Re: [PATCH RFC 07/22] arm/cpuhp: Init PMU at host for all possible vcpus

[Andrew Jones]

On Sat, Jun 13, 2020 at 10:36:14PM +0100, Salil Mehta wrote:
> PMU for all possible vcpus must be initialized at the virt machine
> initialization time. This patch refactors existing code to accomodate possible
> vcpus. This also assumes that all processor being used are identical at least
> for now but does not affect the normal scanarios where they might not be in
> future. This assumption only affects the future hotplug scenarios if ever 
> there
> exists any hetergenous processors. In such a case PMU might not be enabled on
> some vcpus. Is it acceptable and doable tradeoff for now?
> 
> This perhaps needs more discussion. please check below link,
> Link: https://lists.gnu.org/archive/html/qemu-devel/2020-06/msg00131.html
> 
> Co-developed-by: Keqian Zhu <zhukeqian1@huawei.com>
> Signed-off-by: Salil Mehta <salil.mehta@huawei.com>
> ---
>  hw/arm/virt.c         | 51 ++++++++++++++++++++++++++++++-------------
>  include/hw/arm/virt.h |  1 +
>  2 files changed, 37 insertions(+), 15 deletions(-)
>

I have a similar patch to this one in my steal-time dev branch that I just
started last week. I'm creating a new function that must be called after
cpu realization and gic creation that completes cpu setup. There's a few
things that will end up there (including steal-time stuff).

Thanks,
drew