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Re: BUG kernel 6.12.19 defautl_swiotlb_limit() returns wrong value for CONFIG_SWIOTLB_DYNAMIC=y effects atm only under XEN dom0
- To: xen-devel@xxxxxxxxxxxxxxxxxxxx
- From: Andreas Greve <andreas.greve@xxxxxxxxxx>
- Date: Sun, 18 May 2025 17:37:17 +0200
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- Cc: andreas.greve@xxxxxxxxxx
- Delivery-date: Sun, 18 May 2025 15:37:42 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
Hello to all,
here is my BUG-Fix tested against kernel 6.12.19 and 6.12.28.
Signed-off-by: Andreas Greve andreas.greve@xxxxxxxxxx
diff --git a/kernel/dma/swiotlb.c b/kernel/dma/swiotlb.c
index abcf3fa63a56..742e6cbbe852 100644
--- a/kernel/dma/swiotlb.c
+++ b/kernel/dma/swiotlb.c
@@ -1654,7 +1654,16 @@ phys_addr_t default_swiotlb_base(void)
phys_addr_t default_swiotlb_limit(void)
{
#ifdef CONFIG_SWIOTLB_DYNAMIC
- return io_tlb_default_mem.phys_limit;
+ struct io_tlb_mem *mem = &io_tlb_default_mem;
+ phys_addr_t retval = mem->defpool.end;
+ struct io_tlb_pool *pool;
+ rcu_read_lock();
+ list_for_each_entry_rcu(pool, &mem->pools, node) {
+ if (pool->end > retval)
+ retval = pool->end;
+ }
+ rcu_read_unlock();
+ return retval - 1;
#else
return io_tlb_default_mem.defpool.end - 1;
#endif
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