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charset="utf-8" The reference "to shadow the resident processes" is applicable to domains (potentially) running in shadow mode only. Adjust the calculations accordingly. In dom0_paging_pages() also take the opportunity and stop open-coding DIV_ROUND_UP(). Signed-off-by: Jan Beulich --- RFC: I'm pretty sure I can't change a public libxl function (deprecated or not) like this, but I also don't know how I should go about doing so (short of introducing a brand new function and leaving the existing one broken). --- a/tools/include/libxl_utils.h +++ b/tools/include/libxl_utils.h @@ -23,7 +23,10 @@ const #endif char *libxl_basename(const char *name); /* returns string from strdup */ =20 -unsigned long libxl_get_required_shadow_memory(unsigned long maxmem_kb, un= signed int smp_cpus); +unsigned long libxl_get_required_shadow_memory(unsigned long maxmem_kb, + unsigned int smp_cpus, + libxl_domain_type type, + bool hap); /* deprecated; see LIBXL_HAVE_DOMAIN_NEED_MEMORY_CONFIG in libxl.h */ int libxl_name_to_domid(libxl_ctx *ctx, const char *name, uint32_t *domid); int libxl_domain_qualifier_to_domid(libxl_ctx *ctx, const char *name, uint= 32_t *domid); --- a/tools/libs/light/libxl_create.c +++ b/tools/libs/light/libxl_create.c @@ -1194,10 +1194,17 @@ int libxl__domain_config_setdefault(libx } =20 if (d_config->b_info.shadow_memkb =3D=3D LIBXL_MEMKB_DEFAULT - && ok_to_default_memkb_in_create(gc)) + && ok_to_default_memkb_in_create(gc)) { + bool hap =3D d_config->c_info.type !=3D LIBXL_DOMAIN_TYPE_PV + ? libxl_defbool_val(d_config->c_info.hap) + : false; + d_config->b_info.shadow_memkb =3D libxl_get_required_shadow_memory(d_config->b_info.max_memkb, - d_config->b_info.max_vcpus); + d_config->b_info.max_vcpus, + d_config->c_info.type, + hap); + } =20 /* No IOMMU reservation is needed if passthrough mode is not 'sync_pt'= */ if (d_config->b_info.iommu_memkb =3D=3D LIBXL_MEMKB_DEFAULT --- a/tools/libs/light/libxl_utils.c +++ b/tools/libs/light/libxl_utils.c @@ -36,15 +36,21 @@ char *libxl_basename(const char *name) return strdup(name); } =20 -unsigned long libxl_get_required_shadow_memory(unsigned long maxmem_kb, un= signed int smp_cpus) +unsigned long libxl_get_required_shadow_memory(unsigned long maxmem_kb, + unsigned int smp_cpus, + libxl_domain_type type, + bool hap) { /* 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. + plus 1 page per MiB of RAM for the P2M map (for non-PV guests), + plus 1 page per MiB of RAM to shadow the resident processes (for sh= adow + mode guests). This is higher than the minimum that Xen would allocate if no value were given (but the Xen minimum is for safety, not performance). */ - return 4 * (256 * smp_cpus + 2 * (maxmem_kb / 1024)); + return 4 * (256 * smp_cpus + + ((type !=3D LIBXL_DOMAIN_TYPE_PV) + !hap) * + (maxmem_kb / 1024)); } =20 char *libxl_domid_to_name(libxl_ctx *ctx, uint32_t domid) --- a/xen/arch/x86/dom0_build.c +++ b/xen/arch/x86/dom0_build.c @@ -317,9 +317,12 @@ unsigned long __init dom0_paging_pages(c /* Copied from: libxl_get_required_shadow_memory() */ unsigned long memkb =3D nr_pages * (PAGE_SIZE / 1024); =20 - memkb =3D 4 * (256 * d->max_vcpus + 2 * (memkb / 1024)); + memkb =3D 4 * (256 * d->max_vcpus + + (paging_mode_enabled(d) + + (opt_dom0_shadow || opt_pv_l1tf_hwdom)) * + (memkb / 1024)); =20 - return ((memkb + 1023) / 1024) << (20 - PAGE_SHIFT); + return DIV_ROUND_UP(memkb, 1024) << (20 - PAGE_SHIFT); }