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vhost: add config flag for postcopy

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Postcopy live-migration features relies on userfaultfd,
which was only introduced in kernel v4.3.

This patch introduces a new define to allow building vhost
library on kernels not supporting userfaultfd.

With legacy build system, user has to explicitly set
CONFIG_RTE_LIBRTE_VHOST_POSTCOPY to 'y'.

With Meson build system, RTE_LIBRTE_VHOST_POSTCOPY gets
automatically defined if userfaultfd kernel header is
present.

Suggested-by: Ilya Maximets <i.maximets@samsung.com>
Signed-off-by: Maxime Coquelin <maxime.coquelin@redhat.com>
Acked-by: Ilya Maximets <i.maximets@samsung.com>
This commit is contained in:
Maxime Coquelin 2018-10-12 14:40:38 +02:00 committed by Ferruh Yigit
parent 9bd3979306
commit 06e787bd94
2 changed files with 3 additions and 0 deletions
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1
config/common_linuxapp
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@ -14,6 +14,7 @@ CONFIG_RTE_LIBRTE_KNI=y
CONFIG_RTE_LIBRTE_PMD_KNI=y
CONFIG_RTE_LIBRTE_VHOST=y
CONFIG_RTE_LIBRTE_VHOST_NUMA=y
CONFIG_RTE_LIBRTE_VHOST_POSTCOPY=n
CONFIG_RTE_LIBRTE_PMD_VHOST=y
CONFIG_RTE_LIBRTE_IFC_PMD=y
CONFIG_RTE_LIBRTE_PMD_AF_PACKET=y

2
lib/librte_vhost/meson.build
View File

@ -7,6 +7,8 @@ endif
if has_libnuma == 1
dpdk_conf.set10('RTE_LIBRTE_VHOST_NUMA', true)
endif
dpdk_conf.set('RTE_LIBRTE_VHOST_POSTCOPY',
cc.has_header('linux/userfaultfd.h'))
version = 4
allow_experimental_apis = true
cflags += '-fno-strict-aliasing'