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Edwin Török a91d1616d8 libs/call: cache up to 4 pages in hypercall bounce buffers

During migration there are a lot of mmap/munmap calls,
because xc_get_pfn_type_batch() exceeds the default hypercall bounce
buffer cache size, and needs to allocate every time it is called.

munmap() is slow, especially in a PV Dom0 (takes an emulation fault),
so is best avoided.

Eventually it'd be good if the memory pool from  xmalloc_tlsf.c
was reused here, but for now make it handle the commonly encountered
sizes (so far up to 4 pages).

Signed-off-by: Edwin Török <edwin.torok@citrix.com>
Signed-off-by: Frediano Ziglio <frediano.ziglio@citrix.com>
Reviewed-by: Anthony PERARD <anthony.perard@vates.tech>

2026-08-10 17:09:22 +02:00

buffer.c

libs/call: cache up to 4 pages in hypercall bounce buffers

2026-08-10 17:09:22 +02:00

core.c

libs/call: cache up to 4 pages in hypercall bounce buffers

2026-08-10 17:09:22 +02:00

freebsd.c

libxencall: osdep_hypercall() should return long

2021-06-24 16:38:37 +02:00

libxencall.map

libxencall: drop bogus mentioning of xencall6()