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Paul Durrant
a5361ebc6d
...to denote what it actually does. The name libxl__xs_write() suggests something taking a buffer and length, akin to write(2), whereas the semantics of the function are actually more akin to printf(3). This patch is a textual substitution of libxl__xs_write with libxl__xs_printf with some associated formatting fixes. Signed-off-by: Paul Durrant <paul.durrant@citrix.com> Acked-by: Ian Jackson <ian.jackson@eu.citrix.com> Cc: Stefano Stabellini <stefano.stabellini@eu.citrix.com> Cc: Ian Campbell <ian.campbell@citrix.com> Cc: Wei Liu <wei.liu2@citrix.com>
118 lines
3.2 KiB
C
118 lines
3.2 KiB
C
/*
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* Copyright (C) 2014 Citrix Systems R&D Ltd.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU Lesser General Public License as published
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* by the Free Software Foundation; version 2.1 only. with the special
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* exception on linking described in file LICENSE.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Lesser General Public License for more details.
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*/
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#include "libxl_osdeps.h" /* must come before any other headers */
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#include "libxl_internal.h"
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#include <xenctrl.h>
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#include <xen/hvm/params.h>
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/*
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* Generate a random VM generation ID.
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*
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* Returns ERROR_FAIL if a suitable source of random numbers is not
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* available.
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*
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* See Microsoft's "Virtual Machine Generation ID" specification for
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* further details, including when a new generation ID is required.
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*
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* http://www.microsoft.com/en-us/download/details.aspx?id=30707
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*/
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int libxl_ms_vm_genid_generate(libxl_ctx *ctx, libxl_ms_vm_genid *id)
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{
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GC_INIT(ctx);
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int ret;
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ret = libxl__random_bytes(gc, id->bytes, LIBXL_MS_VM_GENID_LEN);
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GC_FREE;
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return ret;
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}
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/*
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* Is this VM generation ID all zeros?
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*/
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bool libxl_ms_vm_genid_is_zero(const libxl_ms_vm_genid *id)
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{
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static const libxl_ms_vm_genid zero;
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return memcmp(id->bytes, zero.bytes, LIBXL_MS_VM_GENID_LEN) == 0;
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}
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void libxl_ms_vm_genid_copy(libxl_ctx *ctx, libxl_ms_vm_genid *dst,
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libxl_ms_vm_genid *src)
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{
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memcpy(dst, src, LIBXL_MS_VM_GENID_LEN);
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}
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int libxl__ms_vm_genid_set(libxl__gc *gc, uint32_t domid,
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const libxl_ms_vm_genid *id)
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{
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libxl_ctx *ctx = libxl__gc_owner(gc);
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const char *dom_path;
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uint64_t genid[2];
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uint64_t paddr = 0;
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int rc;
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memcpy(genid, id->bytes, LIBXL_MS_VM_GENID_LEN);
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/*
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* Set the "platform/generation-id" XenStore key to pass the ID to
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* hvmloader.
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*/
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dom_path = libxl__xs_get_dompath(gc, domid);
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if (!dom_path) {
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rc = ERROR_FAIL;
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goto out;
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}
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rc = libxl__xs_printf(gc, XBT_NULL,
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GCSPRINTF("%s/platform/generation-id", dom_path),
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"%"PRIu64 ":%" PRIu64, genid[0], genid[1]);
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if (rc < 0)
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goto out;
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/*
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* Update the ID in guest memory (if available).
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*/
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xc_hvm_param_get(ctx->xch, domid, HVM_PARAM_VM_GENERATION_ID_ADDR, &paddr);
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if (paddr) {
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void *vaddr;
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vaddr = xc_map_foreign_range(ctx->xch, domid, XC_PAGE_SIZE,
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PROT_READ | PROT_WRITE,
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paddr >> XC_PAGE_SHIFT);
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if (vaddr == NULL) {
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rc = ERROR_FAIL;
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goto out;
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}
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memcpy(vaddr + (paddr & ~XC_PAGE_MASK), genid, 2 * sizeof(*genid));
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munmap(vaddr, XC_PAGE_SIZE);
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/*
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* The spec requires an ACPI Notify event is injected into the
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* guest when the generation ID is changed.
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*
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* This is only called for domains that are suspended or newly
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* created and they won't be in a state to receive such an
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* event.
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*/
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}
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rc = 0;
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out:
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return rc;
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}
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