From patchwork Mon May 30 05:39:23 2016 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Theodore Ts'o X-Patchwork-Id: 9140245 X-Patchwork-Delegate: herbert@gondor.apana.org.au Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id 8D50160759 for ; Mon, 30 May 2016 05:40:56 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 8261628185 for ; Mon, 30 May 2016 05:40:56 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 7597628216; Mon, 30 May 2016 05:40:56 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-6.8 required=2.0 tests=BAYES_00,DKIM_SIGNED, RCVD_IN_DNSWL_HI,T_DKIM_INVALID autolearn=ham version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 0AFF328185 for ; Mon, 30 May 2016 05:40:56 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932297AbcE3Fk3 (ORCPT ); Mon, 30 May 2016 01:40:29 -0400 Received: from imap.thunk.org ([74.207.234.97]:45496 "EHLO imap.thunk.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1161105AbcE3FkQ (ORCPT ); Mon, 30 May 2016 01:40:16 -0400 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=thunk.org; s=ef5046eb; h=References:In-Reply-To:Message-Id:Date:Subject:Cc:To:From; bh=T4d9Tiz1p/9p9hnIJ5PD7LSEiVyECle7ECZj+jxH4BE=; b=Fqzti9ftneVAa7vLa9CDSPIRVXPBilJA0KdRHapGoUVrjrirUvRpeTDdYHMK5caATPZIQ3vBaV+Wvz0ozhKYTc4b81anZx/bTAaqrjNSXMasGV2frI0z1jmEP6DKZgFvz1j8yAxu/w7NI9wWwtQjc+/2w+BoECrJbz4uBAYHqKE=; Received: from root (helo=closure.thunk.org) by imap.thunk.org with local-esmtp (Exim 4.84_2) (envelope-from ) id 1b7Fvj-0003Ws-TN; Mon, 30 May 2016 05:39:59 +0000 Received: by closure.thunk.org (Postfix, from userid 15806) id 2ACF282EBB3; Mon, 30 May 2016 01:39:59 -0400 (EDT) From: Theodore Ts'o To: Linux Kernel Developers List Cc: smueller@chronox.de, herbert@gondor.apana.org.au, andi@firstfloor.org, sandyinchina@gmail.com, cryptography@lakedaemon.net, jsd@av8n.com, hpa@zytor.com, linux-crypto@vger.kernel.org, Stephan Mueller , Theodore Ts'o Subject: [PATCH 3/5] random: add interrupt callback to VMBus IRQ handler Date: Mon, 30 May 2016 01:39:23 -0400 Message-Id: <1464586765-14436-4-git-send-email-tytso@mit.edu> X-Mailer: git-send-email 2.5.0 In-Reply-To: <1464586765-14436-1-git-send-email-tytso@mit.edu> References: <1464586765-14436-1-git-send-email-tytso@mit.edu> X-SA-Exim-Connect-IP: X-SA-Exim-Mail-From: tytso@thunk.org X-SA-Exim-Scanned: No (on imap.thunk.org); SAEximRunCond expanded to false Sender: linux-crypto-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-crypto@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP From: Stephan Mueller The Hyper-V Linux Integration Services use the VMBus implementation for communication with the Hypervisor. VMBus registers its own interrupt handler that completely bypasses the common Linux interrupt handling. This implies that the interrupt entropy collector is not triggered. This patch adds the interrupt entropy collection callback into the VMBus interrupt handler function. Signed-off-by: Stephan Mueller Signed-off-by: Stephan Mueller Signed-off-by: Theodore Ts'o --- drivers/char/random.c | 1 + drivers/hv/vmbus_drv.c | 3 +++ 2 files changed, 4 insertions(+) diff --git a/drivers/char/random.c b/drivers/char/random.c index 1778c84..bf370a3 100644 --- a/drivers/char/random.c +++ b/drivers/char/random.c @@ -1141,6 +1141,7 @@ void add_interrupt_randomness(int irq, int irq_flags) /* award one bit for the contents of the fast pool */ credit_entropy_bits(r, credit + 1); } +EXPORT_SYMBOL_GPL(add_interrupt_randomness); #ifdef CONFIG_BLOCK void add_disk_randomness(struct gendisk *disk) diff --git a/drivers/hv/vmbus_drv.c b/drivers/hv/vmbus_drv.c index 952f20f..e82f7e1 100644 --- a/drivers/hv/vmbus_drv.c +++ b/drivers/hv/vmbus_drv.c @@ -42,6 +42,7 @@ #include #include #include +#include #include "hyperv_vmbus.h" static struct acpi_device *hv_acpi_dev; @@ -806,6 +807,8 @@ static void vmbus_isr(void) else tasklet_schedule(hv_context.msg_dpc[cpu]); } + + add_interrupt_randomness(HYPERVISOR_CALLBACK_VECTOR, 0); }