On Mon, Mar 29, 2021 at 01:41:29PM +0800, Like Xu wrote:
> @@ -3869,10 +3876,12 @@ static struct perf_guest_switch_msr *intel_guest_get_msrs(int *nr, void *data)
>
> if (arr[1].guest)
> arr[0].guest |= arr[1].guest;
> - else
> + else {
> arr[1].guest = arr[1].host;
> + arr[2].guest = arr[2].host;
> + }
What's all this gibberish?
The way I read that it says:
if guest has PEBS_ENABLED
guest GLOBAL_CTRL |= PEBS_ENABLED
otherwise
guest PEBS_ENABLED = host PEBS_ENABLED
guest DS_AREA = host DS_AREA
which is just completely random garbage afaict. Why would you leak host
msrs into the guest? Why would you change guest GLOBAL_CTRL implicitly;
guest had better wrmsr that himself to control when stuff is enabled.
This just cannot be right.
