[PATCH RFC 18/37] arm64: mte: Check that tag storage blocks are in the same zone
From: Alexandru Elisei <hidden>
Date: 2023-08-23 13:17:24
Also in:
kvmarm, linux-arch, linux-arm-kernel, linux-fsdevel, linux-mm, lkml
Subsystem:
arm64 port (aarch64 architecture), the rest · Maintainers:
Catalin Marinas, Will Deacon, Linus Torvalds
alloc_contig_range() requires that the requested pages are in the same zone. Check that this is indeed the case before initializing the tag storage blocks. Signed-off-by: Alexandru Elisei <redacted> --- arch/arm64/kernel/mte_tag_storage.c | 35 ++++++++++++++++++++++++++++- 1 file changed, 34 insertions(+), 1 deletion(-)
diff --git a/arch/arm64/kernel/mte_tag_storage.c b/arch/arm64/kernel/mte_tag_storage.c
index f45128d0244e..3e0123aa3fb3 100644
--- a/arch/arm64/kernel/mte_tag_storage.c
+++ b/arch/arm64/kernel/mte_tag_storage.c@@ -269,12 +269,41 @@ void __init mte_tag_storage_init(void) num_tag_regions = 0; } +/* alloc_contig_range() requires all pages to be in the same zone. */ +static int __init mte_tag_storage_check_zone(void) +{ + struct range *tag_range; + struct zone *zone; + unsigned long pfn; + u32 block_size; + int i, j; + + for (i = 0; i < num_tag_regions; i++) { + block_size = tag_regions[i].block_size; + if (block_size == 1) + continue; + + tag_range = &tag_regions[i].tag_range; + for (pfn = tag_range->start; pfn <= tag_range->end; pfn += block_size) { + zone = page_zone(pfn_to_page(pfn)); + for (j = 1; j < block_size; j++) { + if (page_zone(pfn_to_page(pfn + j)) != zone) { + pr_err("Tag block pages in different zones"); + return -EINVAL; + } + } + } + } + + return 0; +} + static int __init mte_tag_storage_activate_regions(void) { phys_addr_t dram_start, dram_end; struct range *tag_range; unsigned long pfn; - int i; + int i, ret; if (num_tag_regions == 0) return 0;
@@ -326,6 +355,10 @@ static int __init mte_tag_storage_activate_regions(void) return 0; } + ret = mte_tag_storage_check_zone(); + if (ret) + return ret; + for (i = 0; i < num_tag_regions; i++) { tag_range = &tag_regions[i].tag_range; for (pfn = tag_range->start; pfn <= tag_range->end; pfn += pageblock_nr_pages) {
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2.41.0