From 905b7ee4d647111d29f29c55618591366321c47a Mon Sep 17 00:00:00 2001 From: David Hildenbrand Date: Wed, 17 Apr 2019 13:31:43 +0200 Subject: exec: Introduce qemu_maxrampagesize() and rename qemu_getrampagesize() Rename qemu_getrampagesize() to qemu_minrampagesize(). While at it, properly rename find_max_supported_pagesize() to find_min_backend_pagesize(). s390x is actually interested into the maximum ram pagesize, so introduce and use qemu_maxrampagesize(). Add a TODO, indicating that looking at any mapped memory backends is not 100% correct in some cases. Signed-off-by: David Hildenbrand Message-Id: <20190417113143.5551-3-david@redhat.com> Reviewed-by: David Gibson Reviewed-by: Igor Mammedov Signed-off-by: Cornelia Huck --- exec.c | 44 ++++++++++++++++++++++++++++++++++++++++---- 1 file changed, 40 insertions(+), 4 deletions(-) (limited to 'exec.c') diff --git a/exec.c b/exec.c index 2646207661..bb1dff423a 100644 --- a/exec.c +++ b/exec.c @@ -1688,7 +1688,7 @@ void ram_block_dump(Monitor *mon) * when we actually open and map them. Iterate over the file * descriptors instead, and use qemu_fd_getpagesize(). */ -static int find_max_supported_pagesize(Object *obj, void *opaque) +static int find_min_backend_pagesize(Object *obj, void *opaque) { long *hpsize_min = opaque; @@ -1704,7 +1704,27 @@ static int find_max_supported_pagesize(Object *obj, void *opaque) return 0; } -long qemu_getrampagesize(void) +static int find_max_backend_pagesize(Object *obj, void *opaque) +{ + long *hpsize_max = opaque; + + if (object_dynamic_cast(obj, TYPE_MEMORY_BACKEND)) { + HostMemoryBackend *backend = MEMORY_BACKEND(obj); + long hpsize = host_memory_backend_pagesize(backend); + + if (host_memory_backend_is_mapped(backend) && (hpsize > *hpsize_max)) { + *hpsize_max = hpsize; + } + } + + return 0; +} + +/* + * TODO: We assume right now that all mapped host memory backends are + * used as RAM, however some might be used for different purposes. + */ +long qemu_minrampagesize(void) { long hpsize = LONG_MAX; long mainrampagesize; @@ -1724,7 +1744,7 @@ long qemu_getrampagesize(void) */ memdev_root = object_resolve_path("/objects", NULL); if (memdev_root) { - object_child_foreach(memdev_root, find_max_supported_pagesize, &hpsize); + object_child_foreach(memdev_root, find_min_backend_pagesize, &hpsize); } if (hpsize == LONG_MAX) { /* No additional memory regions found ==> Report main RAM page size */ @@ -1747,8 +1767,24 @@ long qemu_getrampagesize(void) return hpsize; } + +long qemu_maxrampagesize(void) +{ + long pagesize = qemu_mempath_getpagesize(mem_path); + Object *memdev_root = object_resolve_path("/objects", NULL); + + if (memdev_root) { + object_child_foreach(memdev_root, find_max_backend_pagesize, + &pagesize); + } + return pagesize; +} #else -long qemu_getrampagesize(void) +long qemu_minrampagesize(void) +{ + return getpagesize(); +} +long qemu_maxrampagesize(void) { return getpagesize(); } -- cgit v1.2.3-55-g7522