From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([140.186.70.92]:36972) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1RiWES-00027x-FS for qemu-devel@nongnu.org; Wed, 04 Jan 2012 14:10:41 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1RiWER-0000Wm-5a for qemu-devel@nongnu.org; Wed, 04 Jan 2012 14:10:40 -0500 Received: from smtp02.citrix.com ([66.165.176.63]:10342) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1RiWER-0000Wc-2Z for qemu-devel@nongnu.org; Wed, 04 Jan 2012 14:10:39 -0500 From: Anthony PERARD Date: Wed, 4 Jan 2012 19:10:24 +0000 Message-ID: <1325704224-7939-1-git-send-email-anthony.perard@citrix.com> MIME-Version: 1.0 Content-Type: text/plain Subject: [Qemu-devel] [PATCH] xen: Fix after recent change in dirty bitmap tracking. List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: QEMU-devel Cc: Anthony PERARD , Stefano Stabellini A recent patch set from Avi break the dirty bitmap support of Xen. But this is because the internal function will return an error for an unhandled memory region (a0000 - bffff). But this is not an error. So the patch clarify the function from this point of view. There is now an error print when the Xen call failed. Signed-off-by: Anthony PERARD --- xen-all.c | 38 ++++++++++++++++++-------------------- 1 files changed, 18 insertions(+), 20 deletions(-) diff --git a/xen-all.c b/xen-all.c index dc23265..2aa8c03 100644 --- a/xen-all.c +++ b/xen-all.c @@ -403,9 +403,9 @@ static void xen_region_del(MemoryListener *listener, xen_set_memory(listener, section, false); } -static int xen_sync_dirty_bitmap(XenIOState *state, - target_phys_addr_t start_addr, - ram_addr_t size) +static void xen_sync_dirty_bitmap(XenIOState *state, + target_phys_addr_t start_addr, + ram_addr_t size) { target_phys_addr_t npages = size >> TARGET_PAGE_BITS; target_phys_addr_t vram_offset = 0; @@ -417,21 +417,27 @@ static int xen_sync_dirty_bitmap(XenIOState *state, physmap = get_physmapping(state, start_addr, size); if (physmap == NULL) { /* not handled */ - return -1; + return; } if (state->log_for_dirtybit == NULL) { state->log_for_dirtybit = physmap; } else if (state->log_for_dirtybit != physmap) { - return -1; + /* Only one range for dirty bitmap can be tracked. */ + return; } vram_offset = physmap->phys_offset; rc = xc_hvm_track_dirty_vram(xen_xc, xen_domid, start_addr >> TARGET_PAGE_BITS, npages, bitmap); - if (rc) { - return rc; + if (rc < 0) { + if (rc != -ENODATA) { + fprintf(stderr, "xen: track_dirty_vram failed (0x" TARGET_FMT_plx + ", 0x" TARGET_FMT_plx "): %s\n", + start_addr, start_addr + size, strerror(-rc)); + } + return; } for (i = 0; i < ARRAY_SIZE(bitmap); i++) { @@ -442,40 +448,32 @@ static int xen_sync_dirty_bitmap(XenIOState *state, cpu_physical_memory_set_dirty(vram_offset + (i * width + j) * TARGET_PAGE_SIZE); }; } - - return 0; } static void xen_log_start(MemoryListener *listener, MemoryRegionSection *section) { XenIOState *state = container_of(listener, XenIOState, memory_listener); - int r; - r = xen_sync_dirty_bitmap(state, section->offset_within_address_space, - section->size); - assert(r >= 0); + xen_sync_dirty_bitmap(state, section->offset_within_address_space, + section->size); } static void xen_log_stop(MemoryListener *listener, MemoryRegionSection *section) { XenIOState *state = container_of(listener, XenIOState, memory_listener); - int r; state->log_for_dirtybit = NULL; /* Disable dirty bit tracking */ - r = xc_hvm_track_dirty_vram(xen_xc, xen_domid, 0, 0, NULL); - assert(r >= 0); + xc_hvm_track_dirty_vram(xen_xc, xen_domid, 0, 0, NULL); } static void xen_log_sync(MemoryListener *listener, MemoryRegionSection *section) { XenIOState *state = container_of(listener, XenIOState, memory_listener); - int r; - r = xen_sync_dirty_bitmap(state, section->offset_within_address_space, - section->size); - assert(r >= 0); + xen_sync_dirty_bitmap(state, section->offset_within_address_space, + section->size); } static void xen_log_global_start(MemoryListener *listener) -- tg: (61ec004..) fix/sync-dirty-bitmap (depends on: master)