mirror of
https://github.com/xen-project/xen.git
synced 2026-10-29 02:30:03 +01:00
Keir Fraser
6a9b5290e9
This patch adds the option "superpages" to the domain configuration file. If it is set, the domain is populated using 2M pages. This code does not support fallback to small pages. If the domain can not be created with 2M pages, the create will fail. The patch also includes support for saving and restoring domains with the superpage flag set. However, if a domain has freed small pages within its physical page array and then extended the array, the restore will fill in those freed pages. It will then attempt to allocate more than its memory limit and will fail. This is significant because apparently Linux does this during boot, thus a freshly booted Linux image can not be saved and restored successfully. Signed-off-by: Dave McCracken <dcm@mccr.org>
162 lines
5.1 KiB
C
162 lines
5.1 KiB
C
/*
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* Xen domain builder -- compatibility code.
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*
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* Replacements for xc_linux_build & friends,
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* as example code and to make the new builder
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* usable as drop-in replacement.
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*
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* This code is licenced under the GPL.
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* written 2006 by Gerd Hoffmann <kraxel@suse.de>.
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*
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <inttypes.h>
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#include <zlib.h>
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#include "xenctrl.h"
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#include "xg_private.h"
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#include "xc_dom.h"
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/* ------------------------------------------------------------------------ */
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static int xc_linux_build_internal(struct xc_dom_image *dom,
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int xc_handle, uint32_t domid,
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unsigned int mem_mb,
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unsigned long flags,
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unsigned int store_evtchn,
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unsigned long *store_mfn,
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unsigned int console_evtchn,
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unsigned long *console_mfn,
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int superpages)
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{
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int rc;
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dom->flags = flags;
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dom->console_evtchn = console_evtchn;
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dom->xenstore_evtchn = store_evtchn;
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if ( (rc = xc_dom_boot_xen_init(dom, xc_handle, domid)) != 0 )
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goto out;
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if ( (rc = xc_dom_parse_image(dom)) != 0 )
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goto out;
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if ( (rc = xc_dom_mem_init(dom, mem_mb)) != 0 )
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goto out;
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if ( (rc = xc_dom_boot_mem_init(dom, superpages)) != 0 )
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goto out;
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if ( (rc = xc_dom_build_image(dom)) != 0 )
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goto out;
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if ( (rc = xc_dom_boot_image(dom)) != 0 )
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goto out;
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*console_mfn = xc_dom_p2m_host(dom, dom->console_pfn);
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*store_mfn = xc_dom_p2m_host(dom, dom->xenstore_pfn);
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out:
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return rc;
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}
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int xc_linux_build_mem(int xc_handle, uint32_t domid,
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unsigned int mem_mb,
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const char *image_buffer,
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unsigned long image_size,
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const char *initrd,
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unsigned long initrd_len,
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const char *cmdline,
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const char *features,
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unsigned long flags,
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unsigned int store_evtchn,
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unsigned long *store_mfn,
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unsigned int console_evtchn, unsigned long *console_mfn,
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int superpages)
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{
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struct xc_dom_image *dom;
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int rc;
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xc_dom_loginit();
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dom = xc_dom_allocate(cmdline, features);
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if ( (rc = xc_dom_kernel_mem(dom, image_buffer, image_size)) != 0 )
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goto out;
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if ( initrd && ((rc = xc_dom_ramdisk_mem(dom, initrd, initrd_len)) != 0) )
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goto out;
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rc = xc_linux_build_internal(dom, xc_handle, domid,
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mem_mb, flags,
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store_evtchn, store_mfn,
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console_evtchn, console_mfn, superpages);
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out:
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xc_dom_release(dom);
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return rc;
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}
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int xc_linux_build(int xc_handle, uint32_t domid,
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unsigned int mem_mb,
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const char *image_name,
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const char *initrd_name,
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const char *cmdline,
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const char *features,
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unsigned long flags,
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unsigned int store_evtchn,
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unsigned long *store_mfn,
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unsigned int console_evtchn, unsigned long *console_mfn,
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int superpages)
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{
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struct xc_dom_image *dom;
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int rc;
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xc_dom_loginit();
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dom = xc_dom_allocate(cmdline, features);
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if ( (rc = xc_dom_kernel_file(dom, image_name)) != 0 )
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goto out;
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if ( initrd_name && strlen(initrd_name) &&
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((rc = xc_dom_ramdisk_file(dom, initrd_name)) != 0) )
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goto out;
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rc = xc_linux_build_internal(dom, xc_handle, domid,
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mem_mb, flags,
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store_evtchn, store_mfn,
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console_evtchn, console_mfn, superpages);
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out:
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xc_dom_release(dom);
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return rc;
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}
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int xc_dom_linux_build(int xc_handle,
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struct xc_dom_image *dom,
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uint32_t domid,
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unsigned int mem_mb,
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const char *image_name,
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const char *initrd_name,
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unsigned long flags,
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unsigned int store_evtchn,
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unsigned long *store_mfn,
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unsigned int console_evtchn, unsigned long *console_mfn,
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int superpages)
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{
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int rc;
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if ( (rc = xc_dom_kernel_file(dom, image_name)) != 0 )
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return rc;
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if ( initrd_name && strlen(initrd_name) &&
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((rc = xc_dom_ramdisk_file(dom, initrd_name)) != 0) )
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return rc;
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return xc_linux_build_internal(dom, xc_handle, domid,
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mem_mb, flags,
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store_evtchn, store_mfn,
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console_evtchn, console_mfn, superpages);
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}
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/*
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* Local variables:
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* mode: C
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* c-set-style: "BSD"
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* c-basic-offset: 4
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* tab-width: 4
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* indent-tabs-mode: nil
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* End:
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*/
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