From patchwork Thu Jun 30 19:52:44 2016 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Alex Williamson X-Patchwork-Id: 9208895 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 EDC636075F for ; Thu, 30 Jun 2016 19:53:23 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id DD0DD2865A for ; Thu, 30 Jun 2016 19:53:23 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id D13EA2867E; Thu, 30 Jun 2016 19:53:23 +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=-6.9 required=2.0 tests=BAYES_00,RCVD_IN_DNSWL_HI autolearn=ham version=3.3.1 Received: from lists.gnu.org (lists.gnu.org [208.118.235.17]) (using TLSv1 with cipher AES256-SHA (256/256 bits)) (No client certificate requested) by mail.wl.linuxfoundation.org (Postfix) with ESMTPS id 1D6972865A for ; Thu, 30 Jun 2016 19:53:23 +0000 (UTC) Received: from localhost ([::1]:52380 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1bIi1a-00009B-6u for patchwork-qemu-devel@patchwork.kernel.org; Thu, 30 Jun 2016 15:53:22 -0400 Received: from eggs.gnu.org ([2001:4830:134:3::10]:33995) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1bIi13-00006w-UH for qemu-devel@nongnu.org; Thu, 30 Jun 2016 15:52:51 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1bIi0z-00023l-FH for qemu-devel@nongnu.org; Thu, 30 Jun 2016 15:52:49 -0400 Received: from mx1.redhat.com ([209.132.183.28]:35704) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1bIi0z-00023Z-72 for qemu-devel@nongnu.org; Thu, 30 Jun 2016 15:52:45 -0400 Received: from int-mx09.intmail.prod.int.phx2.redhat.com (int-mx09.intmail.prod.int.phx2.redhat.com [10.5.11.22]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id B93F38E251; Thu, 30 Jun 2016 19:52:44 +0000 (UTC) Received: from gimli.home (ovpn-116-224.phx2.redhat.com [10.3.116.224]) by int-mx09.intmail.prod.int.phx2.redhat.com (8.14.4/8.14.4) with ESMTP id u5UJqimD004536; Thu, 30 Jun 2016 15:52:44 -0400 From: Alex Williamson To: qemu-devel@nongnu.org Date: Thu, 30 Jun 2016 13:52:44 -0600 Message-ID: <20160630195243.18892.71386.stgit@gimli.home> In-Reply-To: <20160630195109.18892.3669.stgit@gimli.home> References: <20160630195109.18892.3669.stgit@gimli.home> User-Agent: StGit/0.17.1-dirty MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.68 on 10.5.11.22 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.26]); Thu, 30 Jun 2016 19:52:44 +0000 (UTC) X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] X-Received-From: 209.132.183.28 Subject: [Qemu-devel] [PULL 2/5] vfio: add pcie extended capability support X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Chen Fan , Laszlo Ersek Errors-To: qemu-devel-bounces+patchwork-qemu-devel=patchwork.kernel.org@nongnu.org Sender: "Qemu-devel" X-Virus-Scanned: ClamAV using ClamSMTP From: Chen Fan For vfio pcie device, we could expose the extended capability on PCIE bus. due to add a new pcie capability at the tail of the chain, in order to avoid config space overwritten, we introduce a copy config for parsing extended caps. and rebuild the pcie extended config space. Signed-off-by: Chen Fan Tested-by: Laszlo Ersek Signed-off-by: Alex Williamson --- hw/vfio/pci.c | 72 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++- 1 file changed, 71 insertions(+), 1 deletion(-) diff --git a/hw/vfio/pci.c b/hw/vfio/pci.c index 53b87b7..a171056b 100644 --- a/hw/vfio/pci.c +++ b/hw/vfio/pci.c @@ -1502,6 +1502,21 @@ static uint8_t vfio_std_cap_max_size(PCIDevice *pdev, uint8_t pos) return next - pos; } + +static uint16_t vfio_ext_cap_max_size(const uint8_t *config, uint16_t pos) +{ + uint16_t tmp, next = PCIE_CONFIG_SPACE_SIZE; + + for (tmp = PCI_CONFIG_SPACE_SIZE; tmp; + tmp = PCI_EXT_CAP_NEXT(pci_get_long(config + tmp))) { + if (tmp > pos && tmp < next) { + next = tmp; + } + } + + return next - pos; +} + static void vfio_set_word_bits(uint8_t *buf, uint16_t val, uint16_t mask) { pci_set_word(buf, (pci_get_word(buf) & ~mask) | val); @@ -1749,16 +1764,71 @@ static int vfio_add_std_cap(VFIOPCIDevice *vdev, uint8_t pos) return 0; } +static int vfio_add_ext_cap(VFIOPCIDevice *vdev) +{ + PCIDevice *pdev = &vdev->pdev; + uint32_t header; + uint16_t cap_id, next, size; + uint8_t cap_ver; + uint8_t *config; + + /* + * pcie_add_capability always inserts the new capability at the tail + * of the chain. Therefore to end up with a chain that matches the + * physical device, we cache the config space to avoid overwriting + * the original config space when we parse the extended capabilities. + */ + config = g_memdup(pdev->config, vdev->config_size); + + for (next = PCI_CONFIG_SPACE_SIZE; next; + next = PCI_EXT_CAP_NEXT(pci_get_long(config + next))) { + header = pci_get_long(config + next); + cap_id = PCI_EXT_CAP_ID(header); + cap_ver = PCI_EXT_CAP_VER(header); + + /* + * If it becomes important to configure extended capabilities to their + * actual size, use this as the default when it's something we don't + * recognize. Since QEMU doesn't actually handle many of the config + * accesses, exact size doesn't seem worthwhile. + */ + size = vfio_ext_cap_max_size(config, next); + + pcie_add_capability(pdev, cap_id, cap_ver, next, size); + pci_set_long(pdev->config + next, PCI_EXT_CAP(cap_id, cap_ver, 0)); + + /* Use emulated next pointer to allow dropping extended caps */ + pci_long_test_and_set_mask(vdev->emulated_config_bits + next, + PCI_EXT_CAP_NEXT_MASK); + } + + g_free(config); + return 0; +} + static int vfio_add_capabilities(VFIOPCIDevice *vdev) { PCIDevice *pdev = &vdev->pdev; + int ret; if (!(pdev->config[PCI_STATUS] & PCI_STATUS_CAP_LIST) || !pdev->config[PCI_CAPABILITY_LIST]) { return 0; /* Nothing to add */ } - return vfio_add_std_cap(vdev, pdev->config[PCI_CAPABILITY_LIST]); + ret = vfio_add_std_cap(vdev, pdev->config[PCI_CAPABILITY_LIST]); + if (ret) { + return ret; + } + + /* on PCI bus, it doesn't make sense to expose extended capabilities. */ + if (!pci_is_express(pdev) || + !pci_bus_is_express(pdev->bus) || + !pci_get_long(pdev->config + PCI_CONFIG_SPACE_SIZE)) { + return 0; + } + + return vfio_add_ext_cap(vdev); } static void vfio_pci_pre_reset(VFIOPCIDevice *vdev)