linux-kernel - [PATCH 3/3] LoongArch: KVM: Register perf callback for guest

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Message-Id: <20250224095618.1436016-4-maobibo@loongson.cn>
Date: Mon, 24 Feb 2025 17:56:18 +0800
From: Bibo Mao <maobibo@...ngson.cn>
To: Tianrui Zhao <zhaotianrui@...ngson.cn>,
	Huacai Chen <chenhuacai@...nel.org>
Cc: WANG Xuerui <kernel@...0n.name>,
	kvm@...r.kernel.org,
	loongarch@...ts.linux.dev,
	linux-kernel@...r.kernel.org
Subject: [PATCH 3/3] LoongArch: KVM: Register perf callback for guest

Add selection for GUEST_PERF_EVENTS if KVM is enabled, also add perf
callback register when KVM module is loading.

Signed-off-by: Bibo Mao <maobibo@...ngson.cn>
---
 arch/loongarch/kvm/Kconfig | 1 +
 arch/loongarch/kvm/main.c  | 2 ++
 2 files changed, 3 insertions(+)

diff --git a/arch/loongarch/kvm/Kconfig b/arch/loongarch/kvm/Kconfig
index 97a811077ac3..40eea6da7c25 100644
--- a/arch/loongarch/kvm/Kconfig
+++ b/arch/loongarch/kvm/Kconfig
@@ -33,6 +33,7 @@ config KVM
 	select KVM_MMIO
 	select KVM_XFER_TO_GUEST_WORK
 	select SCHED_INFO
+	select GUEST_PERF_EVENTS if PERF_EVENTS
 	help
 	  Support hosting virtualized guest machines using
 	  hardware virtualization extensions. You will need
diff --git a/arch/loongarch/kvm/main.c b/arch/loongarch/kvm/main.c
index f6d3242b9234..4c5af4718182 100644
--- a/arch/loongarch/kvm/main.c
+++ b/arch/loongarch/kvm/main.c
@@ -387,6 +387,7 @@ static int kvm_loongarch_env_init(void)
 	}
 
 	kvm_init_gcsr_flag();
+	kvm_register_perf_callbacks(NULL);
 
 	/* Register LoongArch IPI interrupt controller interface. */
 	ret = kvm_loongarch_register_ipi_device();
@@ -408,6 +409,7 @@ static void kvm_loongarch_env_exit(void)
 {
 	unsigned long addr;
 
+	kvm_unregister_perf_callbacks();
 	if (vmcs)
 		free_percpu(vmcs);
 
-- 
2.39.3