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perf/x86/intel: Make @data a mandatory param for intel_guest_get_msrs()

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Drop "support" for passing a NULL @data/@kvm_pmu param when getting guest
MSRs.  KVM, the only in-tree user, unconditionally passes a non-NULL
pointer, and carrying code that suggests @data may be NULL is confusing,
e.g. incorrectly implies that there are scenarios where KVM doesn't pass
a PMU context.

Fixes: 8183a538cd ("KVM: x86/pmu: Add IA32_DS_AREA MSR emulation to support guest DS")
Signed-off-by: Sean Christopherson <seanjc@google.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Reviewed-by: Jim Mattson <jmattson@google.com>
Reviewed-by: Dapeng Mi <dapeng1.mi@linux.intel.com>
Link: https://patch.msgid.link/20260921191418.950933-5-seanjc@google.com
This commit is contained in:
Sean Christopherson 2026-09-21 12:14:12 -07:00 committed by Ingo Molnar
parent d06260e99e
commit a391618e1d
1 changed files with 4 additions and 4 deletions
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8
arch/x86/events/intel/core.c
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@ -5331,11 +5331,11 @@ static struct perf_guest_switch_msr *intel_guest_get_msrs(int *nr, void *data)
}
/*
* If the guest won't use PEBS or the CPU doesn't support PEBS in the
* guest, then there's nothing more to do as disabling PMCs via
* PERF_GLOBAL_CTRL is sufficient on CPUs with guest/host isolation.
* If the CPU doesn't support PEBS in the guest, then there's nothing
* more to do as disabling PMCs via PERF_GLOBAL_CTRL is sufficient on
* CPUs with guest/host isolation.
*/
if (!kvm_pmu || !x86_pmu.pebs_ept)
if (!x86_pmu.pebs_ept)
return arr;
/*