From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([2001:4830:134:3::10]:42030) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1dtt7K-0005lV-GH for qemu-devel@nongnu.org; Mon, 18 Sep 2017 06:17:32 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1dtt7J-0004GS-DZ for qemu-devel@nongnu.org; Mon, 18 Sep 2017 06:17:30 -0400 Received: from ozlabs.ru ([107.173.13.209]:35254) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1dtt7J-0004Dh-8e for qemu-devel@nongnu.org; Mon, 18 Sep 2017 06:17:29 -0400 From: Alexey Kardashevskiy Date: Mon, 18 Sep 2017 20:17:06 +1000 Message-Id: <20170918101709.30421-11-aik@ozlabs.ru> In-Reply-To: <20170918101709.30421-1-aik@ozlabs.ru> References: <20170918101709.30421-1-aik@ozlabs.ru> Subject: [Qemu-devel] [PATCH qemu v3 10/13] memory: Store physical root MR in FlatView List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: qemu-devel@nongnu.org Cc: Alexey Kardashevskiy , Paolo Bonzini Address spaces get to keep a root MR (alias or not) but FlatView stores the actual MR as this is going to be used later on to decide whether to share a particular FlatView or not. Signed-off-by: Alexey Kardashevskiy --- memory.c | 27 ++++++++++++++++++++++----- 1 file changed, 22 insertions(+), 5 deletions(-) diff --git a/memory.c b/memory.c index e046f7bc2f..e18ef53cc2 100644 --- a/memory.c +++ b/memory.c @@ -231,6 +231,7 @@ struct FlatView { unsigned nr; unsigned nr_allocated; struct AddressSpaceDispatch *dispatch; + MemoryRegion *root; }; typedef struct AddressSpaceOps AddressSpaceOps; @@ -260,12 +261,14 @@ static bool flatrange_equal(FlatRange *a, FlatRange *b) && a->readonly == b->readonly; } -static FlatView *flatview_new(void) +static FlatView *flatview_new(MemoryRegion *mr_root) { FlatView *view; view = g_new0(FlatView, 1); view->ref = 1; + view->root = mr_root; + memory_region_ref(mr_root); return view; } @@ -298,6 +301,7 @@ static void flatview_destroy(FlatView *view) memory_region_unref(view->ranges[i].mr); } g_free(view->ranges); + memory_region_unref(view->root); g_free(view); } @@ -723,12 +727,25 @@ static void render_memory_region(FlatView *view, } } +static MemoryRegion *memory_region_unalias_entire(MemoryRegion *mr) +{ + while (mr->alias && !mr->alias_offset && + int128_ge(mr->size, mr->alias->size)) { + /* The alias is included in its entirety. Use it as + * the "real" root, so that we can share more FlatViews. + */ + mr = mr->alias; + } + + return mr; +} + /* Render a memory topology into a list of disjoint absolute ranges. */ static FlatView *generate_memory_topology(MemoryRegion *mr) { FlatView *view; - view = flatview_new(); + view = flatview_new(mr); if (mr) { render_memory_region(view, mr, int128_zero(), @@ -903,7 +920,8 @@ static void address_space_update_topology_pass(AddressSpace *as, static void address_space_update_topology(AddressSpace *as) { FlatView *old_view = address_space_get_flatview(as); - FlatView *new_view = generate_memory_topology(as->root); + MemoryRegion *physmr = memory_region_unalias_entire(old_view->root); + FlatView *new_view = generate_memory_topology(physmr); int i; new_view->dispatch = address_space_dispatch_new(new_view); @@ -913,7 +931,6 @@ static void address_space_update_topology(AddressSpace *as) flatview_add_to_dispatch(new_view, &mrs); } address_space_dispatch_compact(new_view->dispatch); - address_space_update_topology_pass(as, old_view, new_view, false); address_space_update_topology_pass(as, old_view, new_view, true); @@ -2644,7 +2661,7 @@ void address_space_init(AddressSpace *as, MemoryRegion *root, const char *name) as->ref_count = 1; as->root = root; as->malloced = false; - as->current_map = flatview_new(); + as->current_map = flatview_new(root); as->ioeventfd_nb = 0; as->ioeventfds = NULL; QTAILQ_INIT(&as->listeners); -- 2.11.0