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| author | David Hildenbrand <david@redhat.com> | 2021-11-26 16:42:09 +0300 |
|---|---|---|
| committer | Michael S. Tsirkin <mst@redhat.com> | 2022-01-15 02:50:52 +0300 |
| commit | 57c5a5b304b0d3798b2d3dc75bd6c960d78ee8ff (patch) | |
| tree | b777ebd0de3a8b13cfd593c89dab30455782d82d /drivers/virtio | |
| parent | 6639032acc085775452a2c92fdb8a6f601c9c075 (diff) | |
| download | linux-57c5a5b304b0d3798b2d3dc75bd6c960d78ee8ff.tar.xz | |
virtio-mem: prepare fake page onlining code for granularity smaller than MAX_ORDER - 1
Let's prepare our fake page onlining code for subblock size smaller than
MAX_ORDER - 1: we might get called for ranges not covering properly
aligned MAX_ORDER - 1 pages. We have to detect the order to use
dynamically.
Signed-off-by: David Hildenbrand <david@redhat.com>
Link: https://lore.kernel.org/r/20211126134209.17332-3-david@redhat.com
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Reviewed-by: Zi Yan <ziy@nvidia.com>
Reviewed-by: Eric Ren <renzhengeek@gmail.com>
Diffstat (limited to 'drivers/virtio')
| -rw-r--r-- | drivers/virtio/virtio_mem.c | 26 |
1 files changed, 13 insertions, 13 deletions
diff --git a/drivers/virtio/virtio_mem.c b/drivers/virtio/virtio_mem.c index 434aba845245..a6a78685cfbe 100644 --- a/drivers/virtio/virtio_mem.c +++ b/drivers/virtio/virtio_mem.c @@ -1121,15 +1121,18 @@ static void virtio_mem_clear_fake_offline(unsigned long pfn, */ static void virtio_mem_fake_online(unsigned long pfn, unsigned long nr_pages) { - const unsigned long max_nr_pages = MAX_ORDER_NR_PAGES; + unsigned long order = MAX_ORDER - 1; unsigned long i; /* - * We are always called at least with MAX_ORDER_NR_PAGES - * granularity/alignment (e.g., the way subblocks work). All pages - * inside such a block are alike. + * We might get called for ranges that don't cover properly aligned + * MAX_ORDER - 1 pages; however, we can only online properly aligned + * pages with an order of MAX_ORDER - 1 at maximum. */ - for (i = 0; i < nr_pages; i += max_nr_pages) { + while (!IS_ALIGNED(pfn | nr_pages, 1 << order)) + order--; + + for (i = 0; i < nr_pages; i += 1 << order) { struct page *page = pfn_to_page(pfn + i); /* @@ -1139,14 +1142,12 @@ static void virtio_mem_fake_online(unsigned long pfn, unsigned long nr_pages) * alike. */ if (PageDirty(page)) { - virtio_mem_clear_fake_offline(pfn + i, max_nr_pages, - false); - generic_online_page(page, MAX_ORDER - 1); + virtio_mem_clear_fake_offline(pfn + i, 1 << order, false); + generic_online_page(page, order); } else { - virtio_mem_clear_fake_offline(pfn + i, max_nr_pages, - true); - free_contig_range(pfn + i, max_nr_pages); - adjust_managed_page_count(page, max_nr_pages); + virtio_mem_clear_fake_offline(pfn + i, 1 << order, true); + free_contig_range(pfn + i, 1 << order); + adjust_managed_page_count(page, 1 << order); } } } @@ -2477,7 +2478,6 @@ static int virtio_mem_init_hotplug(struct virtio_mem *vm) /* * We want subblocks to span at least MAX_ORDER_NR_PAGES and * pageblock_nr_pages pages. This: - * - Simplifies our fake page onlining code (virtio_mem_fake_online). * - Is required for now for alloc_contig_range() to work reliably - * it doesn't properly handle smaller granularity on ZONE_NORMAL. */ |