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libxl: use API 4.13 to support domUs with more than 4TB

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To support domUs with more than 4TB memory it is required to use
LIBXL_API_VERSION >= 0x040800, which uses uint64_t for certained guest
memory related quantities.

Unfortunately this change is not straight forward. While most of the
code in libxl.h handles the various LIBXL_API_VERSION variants
correctly, the check for valid a LIBXL_API_VERSION at the beginning of
the file was broken between Xen 4.7 and 4.13 - it did not cover for
API changes introduced in Xen 4.7 and 4.8. This was fixed with
xen-project/xen@c3999835df, which for libvirt means in practice either
the libxl API from Xen 4.5 or 4.13+ can be used.

This change uses pkgconfig to decide which API can be safely selected.
Xen provides a pkgconfig file since Xen 4.6, which is also the lowest
version expected by libvirt.

Signed-off-by: Olaf Hering <olaf@aepfle.de>
Reviewed-by: Jim Fehlig <jfehlig@suse.com>
This commit is contained in:
Olaf Hering 2021-03-25 17:26:12 +01:00 committed by Jim Fehlig
parent 8bc6a55f1b
commit 2fc3a704e7
1 changed files with 6 additions and 1 deletions
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7
meson.build
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@ -1592,8 +1592,13 @@ if not get_option('driver_libxl').disabled() and conf.has('WITH_LIBVIRTD')
xtl_link_dep = cc.find_library('xenctrl')
endif
if libxl_dep.version().version_compare('>=4.13.0')
LIBXL_API_VERSION='0x041300'
else
LIBXL_API_VERSION='0x040500'
endif
libxl_dep = declare_dependency(
compile_args: '-DLIBXL_API_VERSION=0x040500',
compile_args: '-DLIBXL_API_VERSION=' + LIBXL_API_VERSION,
dependencies: [
libxl_dep,
xtl_link_dep,