On 9/21/21 8:05 PM, Sean Christopherson wrote:

From: Like Xu <redacted>

To prepare for using static_calls to optimize perf's guest callbacks,
replace ->is_in_guest and ->is_user_mode with a new multiplexed hook
->state, tweak ->handle_intel_pt_intr to play nice with being called when
there is no active guest, and drop "guest" from ->is_in_guest.

Return '0' from ->state and ->handle_intel_pt_intr to indicate "not in
guest" so that DEFINE_STATIC_CALL_RET0 can be used to define the static
calls, i.e. no callback == !guest.

Suggested-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Originally-by: Peter Zijlstra (Intel) [off-list ref]
Signed-off-by: Like Xu <redacted>
Signed-off-by: Zhu Lingshan <redacted>
[sean: extracted from static_call patch, fixed get_ip() bug, wrote changelog]
Signed-off-by: Sean Christopherson <seanjc@google.com>

For Xen bits


Reviewed-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>




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