From nobody Fri Dec 19 20:13:25 2025 Received: from out-189.mta1.migadu.com (out-189.mta1.migadu.com [95.215.58.189]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id A6C1737715 for ; Tue, 13 Feb 2024 09:33:28 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=95.215.58.189 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1707816810; cv=none; b=CVXiAfzSM3tX2AOElAR8Z5fO4u2RDx0NwroRswkgkd/b4CCkRNzCqHCpDmwgnBfwJyfSVzxvMY0NmBSDNB4cSCQvFdZXEv+lGMB0l2PzYjsAoNlNmJQCPTOPIkTbH8PcUacTJx/9GyCse4CGrOOov9wEUAInqO8U9joXfeHVRXo= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1707816810; c=relaxed/simple; bh=Xl8MN8nPeESY7C6rMo2OigN0MetDVjtmFaMrPpaUx6g=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=CrTjiOhLiP2Btp+WzDlYKDVuOucDWdkKafEqDbPJs5rP5jTYVMM6zzg6LpoO99GDwOLvKu5GkQjCS1p0fCKMdTz1QiK3XklNKA0FPrwBr6CqvI4bj0z5q1Rhu9kPmER3gnSrPaOCEGCwzYkgs56K25/99JKrmH4QyQVJ432r398= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.dev; spf=pass smtp.mailfrom=linux.dev; dkim=pass (1024-bit key) header.d=linux.dev header.i=@linux.dev header.b=JxeGbdEa; arc=none smtp.client-ip=95.215.58.189 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.dev Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=linux.dev Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linux.dev header.i=@linux.dev header.b="JxeGbdEa" X-Report-Abuse: Please report any abuse attempt to abuse@migadu.com and include these headers. DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux.dev; s=key1; t=1707816807; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=TtUC9LwCBXa/InKHa3MSglqgjCcySjFJ8GApzq67bXk=; b=JxeGbdEawMgFP4lolaW83sT6rOVtn3Jr5awIE+IJufW0O6N7HRGIYnCCAdSYU1n3+2eSFJ 4Lal0qXRYPH/zdJ9lHg+ZsUA6r4ZMDf3+VNDIH4rnpGq1vpnwRkOQFCGELItFtMp80Tt9B QEiMbQvQ+M6qEBCO8OHFpR4xtsc+py4= From: Oliver Upton To: kvmarm@lists.linux.dev Cc: kvm@vger.kernel.org, Marc Zyngier , James Morse , Suzuki K Poulose , Zenghui Yu , linux-kernel@vger.kernel.org, Oliver Upton Subject: [PATCH v2 08/23] KVM: arm64: vgic: Free LPI vgic_irq structs in an RCU-safe manner Date: Tue, 13 Feb 2024 09:32:45 +0000 Message-ID: <20240213093250.3960069-9-oliver.upton@linux.dev> In-Reply-To: <20240213093250.3960069-1-oliver.upton@linux.dev> References: <20240213093250.3960069-1-oliver.upton@linux.dev> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-Migadu-Flow: FLOW_OUT Content-Type: text/plain; charset="utf-8" Free the vgic_irq structs in an RCU-safe manner to allow reads of the LPI configuration data to happen in parallel with the release of LPIs. Signed-off-by: Oliver Upton --- arch/arm64/kvm/vgic/vgic.c | 2 +- include/kvm/arm_vgic.h | 1 + 2 files changed, 2 insertions(+), 1 deletion(-) diff --git a/arch/arm64/kvm/vgic/vgic.c b/arch/arm64/kvm/vgic/vgic.c index 5988d162b765..be3ed4c5e1fa 100644 --- a/arch/arm64/kvm/vgic/vgic.c +++ b/arch/arm64/kvm/vgic/vgic.c @@ -124,7 +124,7 @@ void __vgic_put_lpi_locked(struct kvm *kvm, struct vgic= _irq *irq) xa_erase(&dist->lpi_xa, irq->intid); atomic_dec(&dist->lpi_count); =20 - kfree(irq); + kfree_rcu(irq, rcu); } =20 void vgic_put_irq(struct kvm *kvm, struct vgic_irq *irq) diff --git a/include/kvm/arm_vgic.h b/include/kvm/arm_vgic.h index 71e9d719533b..47035946648e 100644 --- a/include/kvm/arm_vgic.h +++ b/include/kvm/arm_vgic.h @@ -117,6 +117,7 @@ struct irq_ops { =20 struct vgic_irq { raw_spinlock_t irq_lock; /* Protects the content of the struct */ + struct rcu_head rcu; struct list_head ap_list; =20 struct kvm_vcpu *vcpu; /* SGIs and PPIs: The VCPU --=20 2.43.0.687.g38aa6559b0-goog