AKASHI Takahiro 654580eee1 xen: pvblock: fix the maximum io size in one operation ... The current implementation may cause BUG_ON() in blkfront_aio() BUG_ON(n > BLKIF_MAX_SEGMENTS_PER_REQUEST); In pvblock_iop(), a read/write operation will be split into smaller chunks of data so that the size in one access (aio_nbytes) is limited to, at the maximum, BLKIF_MAX_SEGMENTS_PER_REQUEST * PAGE_SIZE But this works only if when the *buffer* passed in to pvblock_io() is page-aligned. If not, the given data region may stand across (BLKIF_MAX_SEGMENTS_PER_REQUEST + 1) pages. See the logic in blkfront_aio(): start = (uintptr_t)aiocbp->aio_buf & PAGE_MASK; end = ((uintptr_t)aiocbp->aio_buf + aiocbp->aio_nbytes + PAGE_SIZE - 1) & PAGE_MASK; Then this will lead to BUG_ON() above. This can be fixed by decreasing the maximum size of aio_nbytes. Signed-off-by: AKASHI Takahiro <takahiro.akashi@linaro.org> Fixes: commit 3a739cc6c9 ("xen: pvblock: Implement front-back protocol and do IO")		2023-11-29 09:32:15 -05:00
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events.c	Correct SPL uses of XEN_SERIAL	2023-02-10 07:41:41 -05:00
gnttab.c	WS cleanup: remove trailing empty lines	2021-09-30 08:08:56 -04:00
hypervisor.c	xen: Limit execution to EL1 only	2023-04-25 15:31:28 -04:00
Kconfig	xen: Fix Kconfig dependencies	2023-04-25 15:31:28 -04:00
Makefile	xen: pvblock: Add initial support for para-virtualized block driver	2020-08-14 15:18:30 -04:00
pvblock.c	xen: pvblock: fix the maximum io size in one operation	2023-11-29 09:32:15 -05:00
xenbus.c	xen: Port Xen bus driver from mini-os	2020-08-14 15:18:30 -04:00