From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-19.1 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER,INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 18BD2C43217 for ; Thu, 16 Sep 2021 16:34:51 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 03F786187F for ; Thu, 16 Sep 2021 16:34:51 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S244317AbhIPQfG (ORCPT ); Thu, 16 Sep 2021 12:35:06 -0400 Received: from mail.kernel.org ([198.145.29.99]:37488 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S242190AbhIPQ1J (ORCPT ); Thu, 16 Sep 2021 12:27:09 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id 8F29C6154B; Thu, 16 Sep 2021 16:17:27 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1631809048; bh=tupHmxPw+XerXzPsoto+Ct0/EvARjfdxIA1OwPdZcs0=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=RkwGkcPRvC5s6kvcBNqFs6P1K8hThtlvuPW3mB/7ILkMdnoAbNMGjpif0ZciArJ27 DAn9Ya7focNOqKYfa2LiuRigRksIy3hXQfcmkBJyX0Bt6wVj3PegHnBAEK+lT92lvu 22fAk1xhkH6sqMHr0GRzsGQ35AyrVW3IyEPUde0s= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, =?UTF-8?q?Marek=20Marczykowski-G=C3=B3recki?= , Thomas Gleixner , Bjorn Helgaas Subject: [PATCH 5.13 012/380] PCI/MSI: Skip masking MSI-X on Xen PV Date: Thu, 16 Sep 2021 17:56:09 +0200 Message-Id: <20210916155804.388603016@linuxfoundation.org> X-Mailer: git-send-email 2.33.0 In-Reply-To: <20210916155803.966362085@linuxfoundation.org> References: <20210916155803.966362085@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Marek Marczykowski-Górecki commit 1a519dc7a73c977547d8b5108d98c6e769c89f4b upstream. When running as Xen PV guest, masking MSI-X is a responsibility of the hypervisor. The guest has no write access to the relevant BAR at all - when it tries to, it results in a crash like this: BUG: unable to handle page fault for address: ffffc9004069100c #PF: supervisor write access in kernel mode #PF: error_code(0x0003) - permissions violation RIP: e030:__pci_enable_msix_range.part.0+0x26b/0x5f0 e1000e_set_interrupt_capability+0xbf/0xd0 [e1000e] e1000_probe+0x41f/0xdb0 [e1000e] local_pci_probe+0x42/0x80 (...) The recently introduced function msix_mask_all() does not check the global variable pci_msi_ignore_mask which is set by XEN PV to bypass the masking of MSI[-X] interrupts. Add the check to make this function XEN PV compatible. Fixes: 7d5ec3d36123 ("PCI/MSI: Mask all unused MSI-X entries") Signed-off-by: Marek Marczykowski-Górecki Signed-off-by: Thomas Gleixner Acked-by: Bjorn Helgaas Cc: stable@vger.kernel.org Link: https://lore.kernel.org/r/20210826170342.135172-1-marmarek@invisiblethingslab.com Signed-off-by: Greg Kroah-Hartman --- drivers/pci/msi.c | 3 +++ 1 file changed, 3 insertions(+) --- a/drivers/pci/msi.c +++ b/drivers/pci/msi.c @@ -776,6 +776,9 @@ static void msix_mask_all(void __iomem * u32 ctrl = PCI_MSIX_ENTRY_CTRL_MASKBIT; int i; + if (pci_msi_ignore_mask) + return; + for (i = 0; i < tsize; i++, base += PCI_MSIX_ENTRY_SIZE) writel(ctrl, base + PCI_MSIX_ENTRY_VECTOR_CTRL); }