From nobody Fri Dec 19 20:13:39 2025 Received: from out-171.mta0.migadu.com (out-171.mta0.migadu.com [91.218.175.171]) (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 591361E4A2 for ; Tue, 13 Feb 2024 09:40:23 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=91.218.175.171 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1707817224; cv=none; b=eXC8o1sKJp3j1+h3EHAzFi5vihfgD27Yg/5e3sRH8ahjPmeicWtRKUvpT2YuNePOx7s9QjwM26iUZ4GIhFr1fkrhsbR1Ym7/26qEM4i9VueezdPYOV3HCaKLRaq25gMkMsMegrD8ZWM16W6EWIdsH2ttmogYr9OATSfwVBHBBfo= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1707817224; c=relaxed/simple; bh=Hw7vNI2Kb24vC0nkaK7/5I/kAuFRQ3NHTOq4CoOcbhQ=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=SRcsZD2IKNWwjzUeFb6So1dU5+RjAEsoqBvuz2Rzm12bITGpajaqHA7tlgMsNsb/ooBy+R2CaVkS/XhpJyGiHZ9vOqH9Tf6jEdTZI9HBmGiuACD60jQqf1djZ38IUA1RiUgO8nQGU7q/8/+zJlO+JgvEZQEHl1XIfqv6hrc9FFc= 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=A9/0Pdap; arc=none smtp.client-ip=91.218.175.171 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="A9/0Pdap" 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=1707817221; 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=OvMkuTAmZ2Y4I5mIeurgoX7p1vggpBUJZeCNdIuhqjI=; b=A9/0Pdapfde4UMXWBuOSYEnsYs3XzXeTFT8/HtvInZYMXQGfoyHtP9GTyIEbV2KV6N5ZJf 1GzoPWM9GzgXptD4kKnxk5qSHY2zanY52NPwmDaJzKgsZSISUa26dRM3mo7RTWUFOcRMKa pXPEbI09FCmKKPQNM2lUj+U/uXTIovE= 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 16/23] KVM: arm64: vgic-its: Rely on RCU to protect translation cache reads Date: Tue, 13 Feb 2024 09:40:12 +0000 Message-ID: <20240213094012.3961447-1-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" Stop taking the lpi_list_lock when reading the LPI translation cache. Signed-off-by: Oliver Upton --- arch/arm64/kvm/vgic/vgic-its.c | 5 ++--- 1 file changed, 2 insertions(+), 3 deletions(-) diff --git a/arch/arm64/kvm/vgic/vgic-its.c b/arch/arm64/kvm/vgic/vgic-its.c index 55463eb84763..0e449f8c1f01 100644 --- a/arch/arm64/kvm/vgic/vgic-its.c +++ b/arch/arm64/kvm/vgic/vgic-its.c @@ -593,15 +593,14 @@ static struct vgic_irq *vgic_its_check_cache(struct k= vm *kvm, phys_addr_t db, { struct vgic_dist *dist =3D &kvm->arch.vgic; struct vgic_irq *irq; - unsigned long flags; =20 - raw_spin_lock_irqsave(&dist->lpi_list_lock, flags); + rcu_read_lock(); =20 irq =3D __vgic_its_check_cache(dist, db, devid, eventid); if (!vgic_try_get_irq_kref(irq)) irq =3D NULL; =20 - raw_spin_unlock_irqrestore(&dist->lpi_list_lock, flags); + rcu_read_unlock(); =20 return irq; } --=20 2.43.0.687.g38aa6559b0-goog