From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (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 5B4234315A; Mon, 23 Jun 2025 21:42:09 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1750714929; cv=none; b=NrcXxOZ4Ipk4R26jMIPXwekbUN0+/MbVOV1SlokK8xnlXSNDHPvn8dVeZFg7luHIkt5rgsFTc2SzM4sMThUfL9Q/Bazg7UgmPB1J2wNz9IKZV/Ys4cBeQ6Bp60Ziu90iQe/WB9acKTplqYgMajs84VYcc1lc4joWdisfEbJLo3s= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1750714929; c=relaxed/simple; bh=PLwdwgWSE4ctemOaWl9CO3KzkLbNOB9DA4fgl/ialWM=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=hFeHSFyU3d2bM/tn3yShSsNnkr1oN4otQ+GbYXuSlzfN8/jw6gdsGn+zwaUNLJEa+9rV+pc1GGcJyVSn/tCM6YSmCHctB0qmPMcwDhOBWGX06uwMCoRScHrLn2S94u8fC8YA6dsqWoQyc1Pc+G5oRqd2hcUYDxkRSzs8+3ksGEg= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=Th01mgP9; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="Th01mgP9" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 9BF3FC4CEEA; Mon, 23 Jun 2025 21:42:08 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1750714928; bh=PLwdwgWSE4ctemOaWl9CO3KzkLbNOB9DA4fgl/ialWM=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=Th01mgP93qhH0IeDsSo55MKuRD5v2LFQpAPURldLhzjBz0A03yqLhFxXXstsZxs8n 9NJ72+1IxraDxKKSNocmx7HbaBfVzZ50gmPPAByBwHFwyZjaVfBcQjA0cgIZ3HdYTd iiaz81kQcGGDGdAXq0EsCT1WZNcujJgNL8U+gixg= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Sean Christopherson , Joerg Roedel , Sasha Levin Subject: [PATCH 6.6 169/290] iommu/amd: Ensure GA log notifier callbacks finish running before module unload Date: Mon, 23 Jun 2025 15:07:10 +0200 Message-ID: <20250623130631.974962608@linuxfoundation.org> X-Mailer: git-send-email 2.50.0 In-Reply-To: <20250623130626.910356556@linuxfoundation.org> References: <20250623130626.910356556@linuxfoundation.org> User-Agent: quilt/0.68 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: stable@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 6.6-stable review patch. If anyone has any objections, please let me know. ------------------ From: Sean Christopherson [ Upstream commit 94c721ea03c7078163f41dbaa101ac721ddac329 ] Synchronize RCU when unregistering KVM's GA log notifier to ensure all in-flight interrupt handlers complete before KVM-the module is unloaded. Signed-off-by: Sean Christopherson Link: https://lore.kernel.org/r/20250315031048.2374109-1-seanjc@google.com Signed-off-by: Joerg Roedel Signed-off-by: Sasha Levin --- drivers/iommu/amd/iommu.c | 8 ++++++++ 1 file changed, 8 insertions(+) diff --git a/drivers/iommu/amd/iommu.c b/drivers/iommu/amd/iommu.c index 83c5d786686d0..a5d6d786dba52 100644 --- a/drivers/iommu/amd/iommu.c +++ b/drivers/iommu/amd/iommu.c @@ -780,6 +780,14 @@ int amd_iommu_register_ga_log_notifier(int (*notifier)(u32)) { iommu_ga_log_notifier = notifier; + /* + * Ensure all in-flight IRQ handlers run to completion before returning + * to the caller, e.g. to ensure module code isn't unloaded while it's + * being executed in the IRQ handler. + */ + if (!notifier) + synchronize_rcu(); + return 0; } EXPORT_SYMBOL(amd_iommu_register_ga_log_notifier); -- 2.39.5