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libxl: allow libxl to calculate shadow mem requirements

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Long, long ago before libxl_get_required_shadow_memory() was
made publicly available, its code was copied to the libxl driver
for calculating shadow memory requirements of HVM domains.

Long ago, libxl_get_required_shadow_memory() was exported in
libxl_utils.h and included in xen-devel packages everywhere.

Remove the copied code, which has become stale, and let libxl
provode a proper shadow memory value.
This commit is contained in:
Jim Fehlig 2016-08-02 17:36:34 -06:00
parent e4e4d17c9c
commit c0960aab7e
1 changed files with 4 additions and 9 deletions
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13
src/libxl/libxl_conf.c
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@ -493,15 +493,10 @@ libxlMakeDomBuildInfo(virDomainDefPtr def,
}
}
/*
* The following comment and calculation were taken directly from
* libxenlight's internal function libxl_get_required_shadow_memory():
*
* 256 pages (1MB) per vcpu, plus 1 page per MiB of RAM for the P2M map,
* plus 1 page per MiB of RAM to shadow the resident processes.
*/
b_info->shadow_memkb = 4 * (256 * libxl_bitmap_count_set(&b_info->avail_vcpus) +
2 * (b_info->max_memkb / 1024));
/* Allow libxl to calculate shadow memory requirements */
b_info->shadow_memkb =
libxl_get_required_shadow_memory(b_info->max_memkb,
b_info->max_vcpus);
} else {
/*
* For compatibility with the legacy xen toolstack, default to pygrub