linux-kernel - [RFC PATCH 21/41] KVM: x86/pmu: Introduce function prototype for Intel CPU to save/restore PMU context

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Message-Id: <20240126085444.324918-22-xiong.y.zhang@linux.intel.com>
Date: Fri, 26 Jan 2024 16:54:24 +0800
From: Xiong Zhang <xiong.y.zhang@...ux.intel.com>
To: seanjc@...gle.com,
	pbonzini@...hat.com,
	peterz@...radead.org,
	mizhang@...gle.com,
	kan.liang@...el.com,
	zhenyuw@...ux.intel.com,
	dapeng1.mi@...ux.intel.com,
	jmattson@...gle.com
Cc: kvm@...r.kernel.org,
	linux-perf-users@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	zhiyuan.lv@...el.com,
	eranian@...gle.com,
	irogers@...gle.com,
	samantha.alt@...el.com,
	like.xu.linux@...il.com,
	chao.gao@...el.com,
	xiong.y.zhang@...ux.intel.com
Subject: [RFC PATCH 21/41] KVM: x86/pmu: Introduce function prototype for Intel CPU to save/restore PMU context

From: Mingwei Zhang <mizhang@...gle.com>

Implement a PMU function prototype for Intel CPU.

Signed-off-by: Mingwei Zhang <mizhang@...gle.com>
---
 arch/x86/kvm/vmx/pmu_intel.c | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/arch/x86/kvm/vmx/pmu_intel.c b/arch/x86/kvm/vmx/pmu_intel.c
index 49df154fbb5b..0d58fe7d243e 100644
--- a/arch/x86/kvm/vmx/pmu_intel.c
+++ b/arch/x86/kvm/vmx/pmu_intel.c
@@ -821,6 +821,14 @@ void intel_passthrough_pmu_msrs(struct kvm_vcpu *vcpu)
 	vmx_set_intercept_for_msr(vcpu, MSR_CORE_PERF_GLOBAL_OVF_CTRL, MSR_TYPE_RW, false);
 }
 
+static void intel_save_pmu_context(struct kvm_vcpu *vcpu)
+{
+}
+
+static void intel_restore_pmu_context(struct kvm_vcpu *vcpu)
+{
+}
+
 struct kvm_pmu_ops intel_pmu_ops __initdata = {
 	.hw_event_available = intel_hw_event_available,
 	.pmc_idx_to_pmc = intel_pmc_idx_to_pmc,
@@ -836,6 +844,8 @@ struct kvm_pmu_ops intel_pmu_ops __initdata = {
 	.deliver_pmi = intel_pmu_deliver_pmi,
 	.cleanup = intel_pmu_cleanup,
 	.passthrough_pmu_msrs = intel_passthrough_pmu_msrs,
+	.save_pmu_context = intel_save_pmu_context,
+	.restore_pmu_context = intel_restore_pmu_context,
 	.EVENTSEL_EVENT = ARCH_PERFMON_EVENTSEL_EVENT,
 	.MAX_NR_GP_COUNTERS = KVM_INTEL_PMC_MAX_GENERIC,
 	.MIN_NR_GP_COUNTERS = 1,
-- 
2.34.1