diff options
| author | Christian Borntraeger <borntraeger@de.ibm.com> | 2012-06-15 05:10:30 +0000 |
|---|---|---|
| committer | Alexander Graf <agraf@suse.de> | 2012-07-10 18:27:33 +0200 |
| commit | fdec9918578ec38738ecf250fa2c2656a44796b5 (patch) | |
| tree | df492b5ddd37c0c69d2e63ca9bfa0196a7dbd7ac /buffered_file.h | |
| parent | 92336855975805d88c7979f53bc05c2d47abab04 (diff) | |
s390: autodetect map private
By default qemu will use MAP_PRIVATE for guest pages. This will write
protect pages and thus break on s390 systems that dont support this feature.
Therefore qemu has a hack to always use MAP_SHARED for s390. But MAP_SHARED
has other problems (no dirty pages tracking, a lot more swap overhead etc.)
Newer systems allow the distinction via KVM_CAP_S390_COW. With this feature
qemu can use the standard qemu alloc if available, otherwise it will use
the old s390 hack.
Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
Signed-off-by: Jens Freimann <jfrei@linux.vnet.ibm.com>
Acked-by: Jan Kiszka <jan.kiszka@siemens.com>
Signed-off-by: Alexander Graf <agraf@suse.de>
Diffstat (limited to 'buffered_file.h')
0 files changed, 0 insertions, 0 deletions