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block: minimal bounce buffer alignment

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The patch introduces new concept: minimal memory alignment for bounce
buffers. Original so called "optimal" value is actually minimal required
value for aligment. It should be used for validation that the IOVec
is properly aligned and bounce buffer is not required.

Though, from the performance point of view, it would be better if
bounce buffer or IOVec allocated by QEMU will be aligned stricter.

The patch does not change any alignment value yet.

Signed-off-by: Denis V. Lunev <den@openvz.org>
Reviewed-by: Kevin Wolf <kwolf@redhat.com>
Message-id: 1431441056-26198-2-git-send-email-den@openvz.org
CC: Paolo Bonzini <pbonzini@redhat.com>
Reviewed-by: Kevin Wolf <kwolf@redhat.com>
CC: Stefan Hajnoczi <stefanha@redhat.com>
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
This commit is contained in:
Denis V. Lunev 2015-05-12 17:30:55 +03:00 • committed by Stefan Hajnoczi
parent eaf5fe2dd4
commit 4196d2f030
5 changed files with 23 additions and 1 deletions
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3
include/block/block_int.h
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@ -313,6 +313,9 @@ typedef struct BlockLimits {
int max_transfer_length;
/* memory alignment so that no bounce buffer is needed */
size_t min_mem_alignment;
/* memory alignment for bounce buffer */
size_t opt_mem_alignment;
} BlockLimits;