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/******************************************************************************
*
* xc_memshr.c
*
* Interface to low-level memory sharing functionality.
*
* Copyright (c) 2009 Citrix Systems, Inc. (Grzegorz Milos)
*
* 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"
#include <xen/memory.h>
#include <xen/grant_table.h>
int xc_memshr_control(xc_interface *xch,
uint32_t domid,
int enable)
{
DECLARE_DOMCTL;
struct xen_domctl_mem_sharing_op *op;
domctl.cmd = XEN_DOMCTL_mem_sharing_op;
domctl.interface_version = XEN_DOMCTL_INTERFACE_VERSION;
domctl.domain = domid;
op = &(domctl.u.mem_sharing_op);
op->op = XEN_DOMCTL_MEM_SHARING_CONTROL;
op->u.enable = enable;
return do_domctl(xch, &domctl);
}
int xc_memshr_ring_enable(xc_interface *xch,
uint32_t domid,
uint32_t *port)
{
if ( !port )
{
errno = EINVAL;
return -1;
}
return xc_vm_event_control(xch, domid,
XEN_VM_EVENT_ENABLE,
XEN_DOMCTL_VM_EVENT_OP_SHARING,
port);
}
int xc_memshr_ring_disable(xc_interface *xch,
uint32_t domid)
{
return xc_vm_event_control(xch, domid,
XEN_VM_EVENT_DISABLE,
XEN_DOMCTL_VM_EVENT_OP_SHARING,
NULL);
}
static int xc_memshr_memop(xc_interface *xch, uint32_t domid,
xen_mem_sharing_op_t *mso)
{
mso->domain = domid;
return xc_memory_op(xch, XENMEM_sharing_op, mso, sizeof(*mso));
}
int xc_memshr_nominate_gfn(xc_interface *xch,
uint32_t domid,
unsigned long gfn,
uint64_t *handle)
{
int rc;
xen_mem_sharing_op_t mso;
memset(&mso, 0, sizeof(mso));
mso.op = XENMEM_sharing_op_nominate_gfn;
mso.u.nominate.u.gfn = gfn;
rc = xc_memshr_memop(xch, domid, &mso);
if ( !rc )
*handle = mso.u.nominate.handle;
return rc;
}
int xc_memshr_nominate_gref(xc_interface *xch,
uint32_t domid,
grant_ref_t gref,
uint64_t *handle)
{
int rc;
xen_mem_sharing_op_t mso;
memset(&mso, 0, sizeof(mso));
mso.op = XENMEM_sharing_op_nominate_gref;
mso.u.nominate.u.grant_ref = gref;
rc = xc_memshr_memop(xch, domid, &mso);
if ( !rc )
*handle = mso.u.nominate.handle;
return rc;
}
int xc_memshr_share_gfns(xc_interface *xch,
uint32_t source_domain,
unsigned long source_gfn,
uint64_t source_handle,
uint32_t client_domain,
unsigned long client_gfn,
uint64_t client_handle)
{
xen_mem_sharing_op_t mso;
memset(&mso, 0, sizeof(mso));
mso.op = XENMEM_sharing_op_share;
mso.u.share.source_handle = source_handle;
mso.u.share.source_gfn = source_gfn;
mso.u.share.client_domain = client_domain;
mso.u.share.client_gfn = client_gfn;
mso.u.share.client_handle = client_handle;
return xc_memshr_memop(xch, source_domain, &mso);
}
int xc_memshr_share_grefs(xc_interface *xch,
uint32_t source_domain,
grant_ref_t source_gref,
uint64_t source_handle,
uint32_t client_domain,
grant_ref_t client_gref,
uint64_t client_handle)
{
xen_mem_sharing_op_t mso;
memset(&mso, 0, sizeof(mso));
mso.op = XENMEM_sharing_op_share;
mso.u.share.source_handle = source_handle;
XENMEM_SHARING_OP_FIELD_MAKE_GREF(mso.u.share.source_gfn, source_gref);
mso.u.share.client_domain = client_domain;
XENMEM_SHARING_OP_FIELD_MAKE_GREF(mso.u.share.client_gfn, client_gref);
mso.u.share.client_handle = client_handle;
return xc_memshr_memop(xch, source_domain, &mso);
}
int xc_memshr_add_to_physmap(xc_interface *xch,
uint32_t source_domain,
unsigned long source_gfn,
uint64_t source_handle,
uint32_t client_domain,
unsigned long client_gfn)
{
xen_mem_sharing_op_t mso;
memset(&mso, 0, sizeof(mso));
mso.op = XENMEM_sharing_op_add_physmap;
mso.u.share.source_handle = source_handle;
mso.u.share.source_gfn = source_gfn;
mso.u.share.client_domain = client_domain;
mso.u.share.client_gfn = client_gfn;
return xc_memshr_memop(xch, source_domain, &mso);
}
int xc_memshr_range_share(xc_interface *xch,
uint32_t source_domain,
uint32_t client_domain,
uint64_t first_gfn,
uint64_t last_gfn)
{
xen_mem_sharing_op_t mso;
memset(&mso, 0, sizeof(mso));
mso.op = XENMEM_sharing_op_range_share;
mso.u.range.client_domain = client_domain;
mso.u.range.first_gfn = first_gfn;
mso.u.range.last_gfn = last_gfn;
return xc_memshr_memop(xch, source_domain, &mso);
}
int xc_memshr_domain_resume(xc_interface *xch,
uint32_t domid)
{
return xc_vm_event_control(xch, domid,
XEN_VM_EVENT_RESUME,
XEN_DOMCTL_VM_EVENT_OP_SHARING,
NULL);
}
int xc_memshr_debug_gfn(xc_interface *xch,
uint32_t domid,
unsigned long gfn)
{
xen_mem_sharing_op_t mso;
memset(&mso, 0, sizeof(mso));
mso.op = XENMEM_sharing_op_debug_gfn;
mso.u.debug.u.gfn = gfn;
return xc_memshr_memop(xch, domid, &mso);
}
int xc_memshr_debug_gref(xc_interface *xch,
uint32_t domid,
grant_ref_t gref)
{
xen_mem_sharing_op_t mso;
memset(&mso, 0, sizeof(mso));
mso.op = XENMEM_sharing_op_debug_gref;
mso.u.debug.u.gref = gref;
return xc_memshr_memop(xch, domid, &mso);
}
int xc_memshr_fork(xc_interface *xch, uint32_t pdomid, uint32_t domid,
bool allow_with_iommu, bool block_interrupts)
{
xen_mem_sharing_op_t mso;
memset(&mso, 0, sizeof(mso));
mso.op = XENMEM_sharing_op_fork;
mso.u.fork.parent_domain = pdomid;
if ( allow_with_iommu )
mso.u.fork.flags |= XENMEM_FORK_WITH_IOMMU_ALLOWED;
if ( block_interrupts )
mso.u.fork.flags |= XENMEM_FORK_BLOCK_INTERRUPTS;
return xc_memshr_memop(xch, domid, &mso);
}
int xc_memshr_fork_reset(xc_interface *xch, uint32_t domid, bool reset_state,
bool reset_memory)
{
xen_mem_sharing_op_t mso;
memset(&mso, 0, sizeof(mso));
mso.op = XENMEM_sharing_op_fork_reset;
if ( reset_state )
mso.u.fork.flags |= XENMEM_FORK_RESET_STATE;
if ( reset_memory )
mso.u.fork.flags |= XENMEM_FORK_RESET_MEMORY;
return xc_memshr_memop(xch, domid, &mso);
}
int xc_memshr_audit(xc_interface *xch)
{
xen_mem_sharing_op_t mso;
memset(&mso, 0, sizeof(mso));
mso.op = XENMEM_sharing_op_audit;
return xc_memory_op(xch, XENMEM_sharing_op, &mso, sizeof(mso));
}
long xc_sharing_freed_pages(xc_interface *xch)
{
return xc_memory_op(xch, XENMEM_get_sharing_freed_pages, NULL, 0);
}
long xc_sharing_used_frames(xc_interface *xch)
{
return xc_memory_op(xch, XENMEM_get_sharing_shared_pages, NULL, 0);
}
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