From 6f58df9d7d48ea612758312485808e45647e9686 Mon Sep 17 00:00:00 2001 From: Juergen Gross Date: Fri, 20 Mar 2026 16:01:17 +0100 Subject: [PATCH] tools/libxl: add functions for retrieving and setting xenstore quota Add some functions allowing to retrieve and set Xenstore quota (either global or domain specific). Signed-off-by: Juergen Gross Acked-by: Nick Rosbrook # golang stuff Reviewed-by: Anthony PERARD --- tools/golang/xenlight/helpers.gen.go | 78 ++++++++++++++++++ tools/golang/xenlight/types.gen.go | 9 +++ tools/include/libxl.h | 20 +++++ tools/libs/light/Makefile | 1 + tools/libs/light/libxl_types.idl | 9 +++ tools/libs/light/libxl_xsquota.c | 116 +++++++++++++++++++++++++++ 6 files changed, 233 insertions(+) create mode 100644 tools/libs/light/libxl_xsquota.c diff --git a/tools/golang/xenlight/helpers.gen.go b/tools/golang/xenlight/helpers.gen.go index 8909fe8a1b..767b9e45f5 100644 --- a/tools/golang/xenlight/helpers.gen.go +++ b/tools/golang/xenlight/helpers.gen.go @@ -998,6 +998,84 @@ xc.policy = C.libxl_rdm_reserve_policy(x.Policy) return nil } +// NewXsQuotaItem returns an instance of XsQuotaItem initialized with defaults. +func NewXsQuotaItem() (*XsQuotaItem, error) { +var ( +x XsQuotaItem +xc C.libxl_xs_quota_item) + +C.libxl_xs_quota_item_init(&xc) +defer C.libxl_xs_quota_item_dispose(&xc) + +if err := x.fromC(&xc); err != nil { +return nil, err } + +return &x, nil} + +func (x *XsQuotaItem) fromC(xc *C.libxl_xs_quota_item) error { + x.Name = C.GoString(xc.name) +x.Val = uint32(xc.val) + + return nil} + +func (x *XsQuotaItem) toC(xc *C.libxl_xs_quota_item) (err error){defer func(){ +if err != nil{ +C.libxl_xs_quota_item_dispose(xc)} +}() + +if x.Name != "" { +xc.name = C.CString(x.Name)} +xc.val = C.uint32_t(x.Val) + + return nil + } + +// NewXsQuotaList returns an instance of XsQuotaList initialized with defaults. +func NewXsQuotaList() (*XsQuotaList, error) { +var ( +x XsQuotaList +xc C.libxl_xs_quota_list) + +C.libxl_xs_quota_list_init(&xc) +defer C.libxl_xs_quota_list_dispose(&xc) + +if err := x.fromC(&xc); err != nil { +return nil, err } + +return &x, nil} + +func (x *XsQuotaList) fromC(xc *C.libxl_xs_quota_list) error { + x.Quota = nil +if n := int(xc.num_quota); n > 0 { +cQuota := (*[1<<28]C.libxl_xs_quota_item)(unsafe.Pointer(xc.quota))[:n:n] +x.Quota = make([]XsQuotaItem, n) +for i, v := range cQuota { +if err := x.Quota[i].fromC(&v); err != nil { +return fmt.Errorf("converting field Quota: %v", err) } +} +} + + return nil} + +func (x *XsQuotaList) toC(xc *C.libxl_xs_quota_list) (err error){defer func(){ +if err != nil{ +C.libxl_xs_quota_list_dispose(xc)} +}() + +if numQuota := len(x.Quota); numQuota > 0 { +xc.quota = (*C.libxl_xs_quota_item)(C.malloc(C.ulong(numQuota)*C.sizeof_libxl_xs_quota_item)) +xc.num_quota = C.int(numQuota) +cQuota := (*[1<<28]C.libxl_xs_quota_item)(unsafe.Pointer(xc.quota))[:numQuota:numQuota] +for i,v := range x.Quota { +if err := v.toC(&cQuota[i]); err != nil { +return fmt.Errorf("converting field Quota: %v", err) +} +} +} + + return nil + } + // NewDomainBuildInfo returns an instance of DomainBuildInfo initialized with defaults. func NewDomainBuildInfo(dtype DomainType) (*DomainBuildInfo, error) { var ( diff --git a/tools/golang/xenlight/types.gen.go b/tools/golang/xenlight/types.gen.go index ab9d4ca7b4..8dd610919d 100644 --- a/tools/golang/xenlight/types.gen.go +++ b/tools/golang/xenlight/types.gen.go @@ -543,6 +543,15 @@ Altp2MModeExternal Altp2MMode = 2 Altp2MModeLimited Altp2MMode = 3 ) +type XsQuotaItem struct { +Name string +Val uint32 +} + +type XsQuotaList struct { +Quota []XsQuotaItem +} + type DomainBuildInfo struct { MaxVcpus int AvailVcpus Bitmap diff --git a/tools/include/libxl.h b/tools/include/libxl.h index bc35e412da..6d2910df34 100644 --- a/tools/include/libxl.h +++ b/tools/include/libxl.h @@ -1537,6 +1537,18 @@ void libxl_mac_copy(libxl_ctx *ctx, libxl_mac *dst, const libxl_mac *src); */ #define LIBXL_HAVE_XEN_PLATFORM_PCI_BAR_UC +/* + * LIBXL_HAVE_XENSTORE_QUOTA + * + * If this is defined the Xenstore quota related functions + * libxl_xs_quota_global_get() + * libxl_xs_quota_global_set() + * libxl_xs_quota_domain_get() + * libxl_xs_quota_domain_set() + * are available. + */ +#define LIBXL_HAVE_XENSTORE_QUOTA + typedef char **libxl_string_list; void libxl_string_list_dispose(libxl_string_list *sl); int libxl_string_list_length(const libxl_string_list *sl); @@ -3011,6 +3023,14 @@ static inline int libxl_qemu_monitor_command_0x041200(libxl_ctx *ctx, #define libxl_qemu_monitor_command libxl_qemu_monitor_command_0x041200 #endif +/* Get/set global and per-domain Xenstore quota. */ +int libxl_xs_quota_global_get(libxl_ctx *ctx, libxl_xs_quota_list *q_out); +int libxl_xs_quota_global_set(libxl_ctx *ctx, libxl_xs_quota_list *q); +int libxl_xs_quota_domain_get(libxl_ctx *ctx, uint32_t domid, + libxl_xs_quota_list *q_out); +int libxl_xs_quota_domain_set(libxl_ctx *ctx, uint32_t domid, + libxl_xs_quota_list *q); + #include /* diff --git a/tools/libs/light/Makefile b/tools/libs/light/Makefile index bc60c46558..ca22a40c6c 100644 --- a/tools/libs/light/Makefile +++ b/tools/libs/light/Makefile @@ -106,6 +106,7 @@ OBJS-y += libxl_pvcalls.o OBJS-y += libxl_vsnd.o OBJS-y += libxl_vkb.o OBJS-y += libxl_virtio.o +OBJS-y += libxl_xsquota.o OBJS-y += libxl_genid.o OBJS-y += _libxl_types.o OBJS-y += libxl_flask.o diff --git a/tools/libs/light/libxl_types.idl b/tools/libs/light/libxl_types.idl index d64a573ff3..1a63c8af76 100644 --- a/tools/libs/light/libxl_types.idl +++ b/tools/libs/light/libxl_types.idl @@ -574,6 +574,15 @@ libxl_altp2m_mode = Enumeration("altp2m_mode", [ (3, "limited"), ], init_val = "LIBXL_ALTP2M_MODE_DISABLED") +libxl_xs_quota_item = Struct("xs_quota_item", [ + ("name", string), + ("val", uint32), + ]) + +libxl_xs_quota_list = Struct("xs_quota_list", [ + ("quota", Array(libxl_xs_quota_item, "num_quota")) + ]) + libxl_domain_build_info = Struct("domain_build_info",[ ("max_vcpus", integer), ("avail_vcpus", libxl_bitmap), diff --git a/tools/libs/light/libxl_xsquota.c b/tools/libs/light/libxl_xsquota.c new file mode 100644 index 0000000000..4524442655 --- /dev/null +++ b/tools/libs/light/libxl_xsquota.c @@ -0,0 +1,116 @@ +/* SPDX-License-Identifier: LGPL-2.1-only */ + +/* Xenstore quota handling functions. */ + +#include "libxl_internal.h" + +static int get_quota(libxl_ctx *ctx, unsigned int domid, + libxl_xs_quota_list *q_out, + bool (func)(struct xs_handle *h, unsigned int domid, + const char *quota, unsigned int *value)) +{ + const char **names; + unsigned int num, i; + bool ok; + int rc; + GC_INIT(ctx); + + libxl_xs_quota_list_init(q_out); + names = xs_get_quota_names(ctx->xsh, &num); + if (!names) { + /* Xenstore quota support is optional! */ + if (errno != ENOSYS) { + libxl_xs_quota_list_dispose(q_out); + rc = ERROR_FAIL; + } else { + rc = 0; + } + goto out; + } + + q_out->num_quota = num; + q_out->quota = libxl__calloc(NOGC, num, sizeof(*q_out->quota)); + for (i = 0; i < num; i++) { + q_out->quota[i].name = libxl__strdup(NOGC, names[i]); + ok = func(ctx->xsh, domid, q_out->quota[i].name, &q_out->quota[i].val); + if (!ok) { + libxl_xs_quota_list_dispose(q_out); + rc = ERROR_FAIL; + goto out; + } + } + + rc = 0; + + out: + free(names); + + GC_FREE; + return rc; +} + +static int set_quota(libxl_ctx *ctx, unsigned int domid, libxl_xs_quota_list *q, + bool (func)(struct xs_handle *h, unsigned int domid, + const char *quota, unsigned int value)) +{ + unsigned int i; + bool ok; + int rc; + GC_INIT(ctx); + + for (i = 0; i < q->num_quota; i++) { + ok = func(ctx->xsh, domid, q->quota[i].name, q->quota[i].val); + if (!ok) { + rc = ERROR_FAIL; + goto out; + } + } + + rc = 0; + + out: + GC_FREE; + return rc; +} + +static bool get_global_quota(struct xs_handle *h, unsigned int domid, + const char *quota, unsigned int *value) +{ + return xs_get_global_quota(h, quota, value); +} + +int libxl_xs_quota_global_get(libxl_ctx *ctx, libxl_xs_quota_list *q_out) +{ + return get_quota(ctx, 0, q_out, get_global_quota); +} + +static bool set_global_quota(struct xs_handle *h, unsigned int domid, + const char *quota, unsigned int value) +{ + return xs_set_global_quota(h, quota, value); +} + +int libxl_xs_quota_global_set(libxl_ctx *ctx, libxl_xs_quota_list *q) +{ + return set_quota(ctx, 0, q, set_global_quota);; +} + +int libxl_xs_quota_domain_get(libxl_ctx *ctx, uint32_t domid, + libxl_xs_quota_list *q_out) +{ + return get_quota(ctx, domid, q_out, xs_get_domain_quota); +} + +int libxl_xs_quota_domain_set(libxl_ctx *ctx, uint32_t domid, + libxl_xs_quota_list *q) +{ + return set_quota(ctx, domid, q, xs_set_domain_quota); +} + +/* + * Local variables: + * mode: C + * c-basic-offset: 4 + * indent-tabs-mode: nil + * End: + */