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/******************************************************************************
*
* xc_vm_event.c
*
* Interface to low-level memory event functionality.
*
* Copyright (c) 2009 Citrix Systems, Inc. (Patrick Colp)
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; If not, see <http://www.gnu.org/licenses/>.
*/
#include "xc_private.h"
int xc_vm_event_control(xc_interface *xch, uint32_t domain_id, unsigned int op,
unsigned int mode, uint32_t *port)
{
DECLARE_DOMCTL;
int rc;
domctl.cmd = XEN_DOMCTL_vm_event_op;
domctl.domain = domain_id;
domctl.u.vm_event_op.op = op;
domctl.u.vm_event_op.mode = mode;
rc = do_domctl(xch, &domctl);
if ( !rc && port )
*port = domctl.u.vm_event_op.u.enable.port;
return rc;
}
void *xc_vm_event_enable(xc_interface *xch, uint32_t domain_id, int param,
uint32_t *port)
{
void *ring_page = NULL;
uint64_t pfn;
xen_pfn_t ring_pfn, mmap_pfn;
unsigned int op, mode;
int rc1, rc2, saved_errno;
if ( !port )
{
errno = EINVAL;
return NULL;
}
/* Pause the domain for ring page setup */
rc1 = xc_domain_pause(xch, domain_id);
if ( rc1 != 0 )
{
PERROR("Unable to pause domain\n");
return NULL;
}
/* Get the pfn of the ring page */
rc1 = xc_hvm_param_get(xch, domain_id, param, &pfn);
if ( rc1 != 0 )
{
PERROR("Failed to get pfn of ring page\n");
goto out;
}
ring_pfn = pfn;
mmap_pfn = pfn;
rc1 = xc_get_pfn_type_batch(xch, domain_id, 1, &mmap_pfn);
if ( rc1 || mmap_pfn & XEN_DOMCTL_PFINFO_XTAB )
{
/* Page not in the physmap, try to populate it */
rc1 = xc_domain_populate_physmap_exact(xch, domain_id, 1, 0, 0,
&ring_pfn);
if ( rc1 != 0 )
{
PERROR("Failed to populate ring pfn\n");
goto out;
}
}
mmap_pfn = ring_pfn;
ring_page = xc_map_foreign_pages(xch, domain_id, PROT_READ | PROT_WRITE,
&mmap_pfn, 1);
if ( !ring_page )
{
PERROR("Could not map the ring page\n");
goto out;
}
switch ( param )
{
case HVM_PARAM_PAGING_RING_PFN:
op = XEN_VM_EVENT_ENABLE;
mode = XEN_DOMCTL_VM_EVENT_OP_PAGING;
break;
case HVM_PARAM_MONITOR_RING_PFN:
op = XEN_VM_EVENT_ENABLE;
mode = XEN_DOMCTL_VM_EVENT_OP_MONITOR;
break;
case HVM_PARAM_SHARING_RING_PFN:
op = XEN_VM_EVENT_ENABLE;
mode = XEN_DOMCTL_VM_EVENT_OP_SHARING;
break;
/*
* This is for the outside chance that the HVM_PARAM is valid but is invalid
* as far as vm_event goes.
*/
default:
errno = EINVAL;
rc1 = -1;
goto out;
}
rc1 = xc_vm_event_control(xch, domain_id, op, mode, port);
if ( rc1 != 0 )
{
PERROR("Failed to enable vm_event\n");
goto out;
}
/* Remove the ring_pfn from the guest's physmap */
rc1 = xc_domain_decrease_reservation_exact(xch, domain_id, 1, 0, &ring_pfn);
if ( rc1 != 0 )
PERROR("Failed to remove ring page from guest physmap");
out:
saved_errno = errno;
rc2 = xc_domain_unpause(xch, domain_id);
if ( rc1 != 0 || rc2 != 0 )
{
if ( rc2 != 0 )
{
if ( rc1 == 0 )
saved_errno = errno;
PERROR("Unable to unpause domain");
}
if ( ring_page )
xenforeignmemory_unmap(xch->fmem, ring_page, 1);
ring_page = NULL;
errno = saved_errno;
}
return ring_page;
}
int xc_vm_event_get_version(xc_interface *xch)
{
DECLARE_DOMCTL;
int rc;
domctl.cmd = XEN_DOMCTL_vm_event_op;
domctl.domain = DOMID_INVALID;
domctl.u.vm_event_op.op = XEN_VM_EVENT_GET_VERSION;
domctl.u.vm_event_op.mode = XEN_DOMCTL_VM_EVENT_OP_MONITOR;
rc = do_domctl(xch, &domctl);
if ( !rc )
rc = domctl.u.vm_event_op.u.version;
return rc;
}
/*
* Local variables:
* mode: C
* c-file-style: "BSD"
* c-basic-offset: 4
* tab-width: 4
* indent-tabs-mode: nil
* End:
*/
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