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swiotlb-xen: ensure to issue well-formed XENMEM_exchange requests 

While the hypervisor hasn't been enforcing this, we would still better
avoid issuing requests with GFNs not aligned to the requested order.
Instead of altering the value also in the call to panic(), drop it
there for being static and hence easy to determine without being part
of the panic message.

Signed-off-by: Jan Beulich <jbeulich@suse.com>
Reviewed-by: Stefano Stabellini <sstabellini@kernel.org>
Link: https://lore.kernel.org/r/7b3998e3-1233-4e5a-89ec-d740e77eb166@suse.com
Signed-off-by: Juergen Gross <jgross@suse.com>
This commit is contained in:
Jan Beulich 2021-09-17 12:45:49 +02:00 committed by Juergen Gross
parent f28347cc66
commit 9074c79b62
1 changed files with 4 additions and 3 deletions
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7
drivers/xen/swiotlb-xen.c
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@ -230,10 +230,11 @@ retry:
/* /*
* Get IO TLB memory from any location. * Get IO TLB memory from any location.
*/ */
start = memblock_alloc(PAGE_ALIGN(bytes), PAGE_SIZE); start = memblock_alloc(PAGE_ALIGN(bytes),
IO_TLB_SEGSIZE << IO_TLB_SHIFT);
if (!start) if (!start)
panic("%s: Failed to allocate %lu bytes align=0x%lx\n", panic("%s: Failed to allocate %lu bytes\n",
__func__, PAGE_ALIGN(bytes), PAGE_SIZE); __func__, PAGE_ALIGN(bytes));
/* /*
* And replace that memory with pages under 4GB. * And replace that memory with pages under 4GB.