From mboxrd@z Thu Jan 1 00:00:00 1970 From: Alex Williamson Subject: [PULL 7/7] vfio: fix mapping of MSIX bar Date: Fri, 17 Jan 2014 12:25:50 -0700 Message-ID: <20140117192550.10456.54442.stgit@bling.home> References: <20140117192252.10456.96113.stgit@bling.home> Mime-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Cc: Alexey Kardashevskiy , qemu-devel@nongnu.org, kvm@vger.kernel.org To: aliguori@amazon.com Return-path: Received: from mx1.redhat.com ([209.132.183.28]:6211 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753667AbaAQTZ4 (ORCPT ); Fri, 17 Jan 2014 14:25:56 -0500 In-Reply-To: <20140117192252.10456.96113.stgit@bling.home> Sender: kvm-owner@vger.kernel.org List-ID: From: Alexey Kardashevskiy VFIO virtualizes MSIX table for the guest but not mapping the part of a BAR which contains an MSIX table. Since vfio_mmap_bar() mmaps chunks before and after the MSIX table, they have to be aligned to the host page size which may be TARGET_PAGE_MASK (4K) or 64K in case of PPC64. This fixes boundaries calculations to use the real host page size. Without the patch, the chunk before MSIX table may overlap with the MSIX table and mmap will fail in the host kernel. The result will be serious slowdown as the whole BAR will be emulated by QEMU. Signed-off-by: Alexey Kardashevskiy Signed-off-by: Alex Williamson --- hw/misc/vfio.c | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) diff --git a/hw/misc/vfio.c b/hw/misc/vfio.c index 432547c..8a1f1a1 100644 --- a/hw/misc/vfio.c +++ b/hw/misc/vfio.c @@ -2544,7 +2544,7 @@ static void vfio_map_bar(VFIODevice *vdev, int nr) * potentially insert a direct-mapped subregion before and after it. */ if (vdev->msix && vdev->msix->table_bar == nr) { - size = vdev->msix->table_offset & TARGET_PAGE_MASK; + size = vdev->msix->table_offset & qemu_host_page_mask; } strncat(name, " mmap", sizeof(name) - strlen(name) - 1); @@ -2556,8 +2556,8 @@ static void vfio_map_bar(VFIODevice *vdev, int nr) if (vdev->msix && vdev->msix->table_bar == nr) { unsigned start; - start = TARGET_PAGE_ALIGN(vdev->msix->table_offset + - (vdev->msix->entries * PCI_MSIX_ENTRY_SIZE)); + start = HOST_PAGE_ALIGN(vdev->msix->table_offset + + (vdev->msix->entries * PCI_MSIX_ENTRY_SIZE)); size = start < bar->size ? bar->size - start : 0; strncat(name, " msix-hi", sizeof(name) - strlen(name) - 1);