From patchwork Wed Apr 3 09:15:11 2013 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Nicholas A. Bellinger" X-Patchwork-Id: 2385871 Return-Path: X-Original-To: patchwork-kvm@patchwork.kernel.org Delivered-To: patchwork-process-083081@patchwork1.kernel.org Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by patchwork1.kernel.org (Postfix) with ESMTP id DCBE43FC71 for ; Wed, 3 Apr 2013 09:26:38 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1763189Ab3DCJ0d (ORCPT ); Wed, 3 Apr 2013 05:26:33 -0400 Received: from mail.linux-iscsi.org ([67.23.28.174]:48298 "EHLO linux-iscsi.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1761458Ab3DCJ03 (ORCPT ); Wed, 3 Apr 2013 05:26:29 -0400 Received: from linux-iscsi.org (localhost [127.0.0.1]) by linux-iscsi.org (Postfix) with ESMTP id 3971822D9D1; Wed, 3 Apr 2013 09:15:14 +0000 (UTC) From: "Nicholas A. Bellinger" To: target-devel Cc: lf-virt , kvm-devel , qemu-devel , "Michael S. Tsirkin" , Stefan Hajnoczi , Paolo Bonzini , Asias He , Anthony Liguori , Nicholas Bellinger Subject: [PATCH] vhost: Add vhost_commit callback for SeaBIOS ROM region re-mapping Date: Wed, 3 Apr 2013 09:15:11 +0000 Message-Id: <1364980511-25122-1-git-send-email-nab@linux-iscsi.org> X-Mailer: git-send-email 1.7.2.5 Sender: kvm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org From: Nicholas Bellinger This patch follows MST's recommendation to move checks for vhost_verify_ring_mappings() -> cpu_physical_memory_map() operations from MemoryListener->region_[add,del]() -> vhost_set_memory() into final MemoryListener->commit() -> vhost_commit() callback. It addresses the case where virtio-scsi vq ioport RAM re-mapping to read-only SeaBIOS ROM triggers a cpu_physical_memory_map() NIL MemoryRegionSection pointer failure. Also save vhost_dev->mem_changed_[start,end]_addr values in vhost_set_memory() for final ranges_overlap checks. (Thanks Paolo!) Cc: Michael S. Tsirkin Cc: Paolo Bonzini Cc: Asias He Signed-off-by: Nicholas Bellinger Acked-by: Michael S. Tsirkin --- hw/vhost.c | 53 ++++++++++++++++++++++++++++++++++++++--------------- hw/vhost.h | 3 +++ 2 files changed, 41 insertions(+), 15 deletions(-) diff --git a/hw/vhost.c b/hw/vhost.c index 832cc89..00345f2 100644 --- a/hw/vhost.c +++ b/hw/vhost.c @@ -385,8 +385,6 @@ static void vhost_set_memory(MemoryListener *listener, bool log_dirty = memory_region_is_logging(section->mr); int s = offsetof(struct vhost_memory, regions) + (dev->mem->nregions + 1) * sizeof dev->mem->regions[0]; - uint64_t log_size; - int r; void *ram; dev->mem = g_realloc(dev->mem, s); @@ -419,12 +417,47 @@ static void vhost_set_memory(MemoryListener *listener, /* Remove old mapping for this memory, if any. */ vhost_dev_unassign_memory(dev, start_addr, size); } + dev->mem_changed_start_addr = MIN(dev->mem_changed_start_addr, start_addr); + dev->mem_changed_end_addr = MAX(dev->mem_changed_end_addr, start_addr + size - 1); + dev->memory_changed = true; +} + +static bool vhost_section(MemoryRegionSection *section) +{ + return memory_region_is_ram(section->mr); +} + +static void vhost_begin(MemoryListener *listener) +{ + struct vhost_dev *dev = container_of(listener, struct vhost_dev, + memory_listener); + dev->mem_changed_end_addr = 0; + dev->mem_changed_start_addr = -1; +} +static void vhost_commit(MemoryListener *listener) +{ + struct vhost_dev *dev = container_of(listener, struct vhost_dev, + memory_listener); + hwaddr start_addr = 0; + ram_addr_t size = 0; + uint64_t log_size; + int r; + + if (!dev->memory_changed) { + return; + } if (!dev->started) { return; } + if (dev->mem_changed_start_addr > dev->mem_changed_end_addr) { + return; + } if (dev->started) { + start_addr = dev->mem_changed_start_addr; + size = dev->mem_changed_end_addr - dev->mem_changed_start_addr + 1; + r = vhost_verify_ring_mappings(dev, start_addr, size); assert(r >= 0); } @@ -432,6 +465,7 @@ static void vhost_set_memory(MemoryListener *listener, if (!dev->log_enabled) { r = ioctl(dev->control, VHOST_SET_MEM_TABLE, dev->mem); assert(r >= 0); + dev->memory_changed = false; return; } log_size = vhost_get_log_size(dev); @@ -448,19 +482,7 @@ static void vhost_set_memory(MemoryListener *listener, if (dev->log_size > log_size + VHOST_LOG_BUFFER) { vhost_dev_log_resize(dev, log_size); } -} - -static bool vhost_section(MemoryRegionSection *section) -{ - return memory_region_is_ram(section->mr); -} - -static void vhost_begin(MemoryListener *listener) -{ -} - -static void vhost_commit(MemoryListener *listener) -{ + dev->memory_changed = false; } static void vhost_region_add(MemoryListener *listener, @@ -854,6 +876,7 @@ int vhost_dev_init(struct vhost_dev *hdev, int devfd, const char *devpath, hdev->log_size = 0; hdev->log_enabled = false; hdev->started = false; + hdev->memory_changed = false; memory_listener_register(&hdev->memory_listener, &address_space_memory); hdev->force = force; return 0; diff --git a/hw/vhost.h b/hw/vhost.h index f062d48..adb40c3 100644 --- a/hw/vhost.h +++ b/hw/vhost.h @@ -45,6 +45,9 @@ struct vhost_dev { vhost_log_chunk_t *log; unsigned long long log_size; bool force; + bool memory_changed; + hwaddr mem_changed_start_addr; + hwaddr mem_changed_end_addr; }; int vhost_dev_init(struct vhost_dev *hdev, int devfd, const char *devpath,