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https://github.com/xen-project/xen.git
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Tamas K Lengyel
f3356e1d4d
Currently mem-sharing can be performed on a page-by-page basis from the control domain. However, this process is quite wasteful when a range of pages have to be deduplicated. This patch introduces a new mem_sharing memop for range sharing where the user doesn't have to separately nominate each page in both the source and destination domain, and the looping over all pages happen in the hypervisor. This significantly reduces the overhead of sharing a range of memory. Signed-off-by: Tamas K Lengyel <tamas.lengyel@zentific.com> Acked-by: Wei Liu <wei.liu2@citrix.com> Reviewed-by: Andrew Cooper <andrew.cooper3@citrix.com>
261 lines
7.2 KiB
C
261 lines
7.2 KiB
C
/******************************************************************************
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*
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* xc_memshr.c
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*
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* Interface to low-level memory sharing functionality.
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*
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* Copyright (c) 2009 Citrix Systems, Inc. (Grzegorz Milos)
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library 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 GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "xc_private.h"
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#include <xen/memory.h>
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#include <xen/grant_table.h>
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int xc_memshr_control(xc_interface *xch,
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domid_t domid,
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int enable)
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{
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DECLARE_DOMCTL;
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struct xen_domctl_mem_sharing_op *op;
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domctl.cmd = XEN_DOMCTL_mem_sharing_op;
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domctl.interface_version = XEN_DOMCTL_INTERFACE_VERSION;
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domctl.domain = domid;
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op = &(domctl.u.mem_sharing_op);
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op->op = XEN_DOMCTL_MEM_SHARING_CONTROL;
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op->u.enable = enable;
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return do_domctl(xch, &domctl);
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}
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int xc_memshr_ring_enable(xc_interface *xch,
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domid_t domid,
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uint32_t *port)
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{
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if ( !port )
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{
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errno = EINVAL;
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return -1;
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}
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return xc_vm_event_control(xch, domid,
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XEN_VM_EVENT_ENABLE,
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XEN_DOMCTL_VM_EVENT_OP_SHARING,
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port);
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}
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int xc_memshr_ring_disable(xc_interface *xch,
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domid_t domid)
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{
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return xc_vm_event_control(xch, domid,
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XEN_VM_EVENT_DISABLE,
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XEN_DOMCTL_VM_EVENT_OP_SHARING,
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NULL);
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}
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static int xc_memshr_memop(xc_interface *xch, domid_t domid,
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xen_mem_sharing_op_t *mso)
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{
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mso->domain = domid;
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return do_memory_op(xch, XENMEM_sharing_op, mso, sizeof(*mso));
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}
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int xc_memshr_nominate_gfn(xc_interface *xch,
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domid_t domid,
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unsigned long gfn,
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uint64_t *handle)
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{
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int rc;
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xen_mem_sharing_op_t mso;
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memset(&mso, 0, sizeof(mso));
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mso.op = XENMEM_sharing_op_nominate_gfn;
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mso.u.nominate.u.gfn = gfn;
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rc = xc_memshr_memop(xch, domid, &mso);
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if (!rc) *handle = mso.u.nominate.handle;
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return rc;
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}
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int xc_memshr_nominate_gref(xc_interface *xch,
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domid_t domid,
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grant_ref_t gref,
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uint64_t *handle)
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{
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int rc;
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xen_mem_sharing_op_t mso;
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memset(&mso, 0, sizeof(mso));
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mso.op = XENMEM_sharing_op_nominate_gref;
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mso.u.nominate.u.grant_ref = gref;
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rc = xc_memshr_memop(xch, domid, &mso);
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if (!rc) *handle = mso.u.nominate.handle;
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return rc;
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}
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int xc_memshr_share_gfns(xc_interface *xch,
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domid_t source_domain,
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unsigned long source_gfn,
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uint64_t source_handle,
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domid_t client_domain,
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unsigned long client_gfn,
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uint64_t client_handle)
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{
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xen_mem_sharing_op_t mso;
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memset(&mso, 0, sizeof(mso));
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mso.op = XENMEM_sharing_op_share;
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mso.u.share.source_handle = source_handle;
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mso.u.share.source_gfn = source_gfn;
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mso.u.share.client_domain = client_domain;
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mso.u.share.client_gfn = client_gfn;
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mso.u.share.client_handle = client_handle;
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return xc_memshr_memop(xch, source_domain, &mso);
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}
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int xc_memshr_share_grefs(xc_interface *xch,
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domid_t source_domain,
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grant_ref_t source_gref,
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uint64_t source_handle,
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domid_t client_domain,
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grant_ref_t client_gref,
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uint64_t client_handle)
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{
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xen_mem_sharing_op_t mso;
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memset(&mso, 0, sizeof(mso));
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mso.op = XENMEM_sharing_op_share;
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mso.u.share.source_handle = source_handle;
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XENMEM_SHARING_OP_FIELD_MAKE_GREF(mso.u.share.source_gfn, source_gref);
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mso.u.share.client_domain = client_domain;
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XENMEM_SHARING_OP_FIELD_MAKE_GREF(mso.u.share.client_gfn, client_gref);
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mso.u.share.client_handle = client_handle;
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return xc_memshr_memop(xch, source_domain, &mso);
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}
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int xc_memshr_add_to_physmap(xc_interface *xch,
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domid_t source_domain,
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unsigned long source_gfn,
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uint64_t source_handle,
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domid_t client_domain,
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unsigned long client_gfn)
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{
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xen_mem_sharing_op_t mso;
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memset(&mso, 0, sizeof(mso));
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mso.op = XENMEM_sharing_op_add_physmap;
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mso.u.share.source_handle = source_handle;
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mso.u.share.source_gfn = source_gfn;
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mso.u.share.client_domain = client_domain;
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mso.u.share.client_gfn = client_gfn;
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return xc_memshr_memop(xch, source_domain, &mso);
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}
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int xc_memshr_range_share(xc_interface *xch,
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domid_t source_domain,
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domid_t client_domain,
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uint64_t first_gfn,
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uint64_t last_gfn)
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{
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xen_mem_sharing_op_t mso;
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memset(&mso, 0, sizeof(mso));
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mso.op = XENMEM_sharing_op_range_share;
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mso.u.range.client_domain = client_domain;
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mso.u.range.first_gfn = first_gfn;
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mso.u.range.last_gfn = last_gfn;
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return xc_memshr_memop(xch, source_domain, &mso);
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}
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int xc_memshr_domain_resume(xc_interface *xch,
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domid_t domid)
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{
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return xc_vm_event_control(xch, domid,
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XEN_VM_EVENT_RESUME,
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XEN_DOMCTL_VM_EVENT_OP_SHARING,
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NULL);
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}
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int xc_memshr_debug_gfn(xc_interface *xch,
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domid_t domid,
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unsigned long gfn)
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{
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xen_mem_sharing_op_t mso;
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memset(&mso, 0, sizeof(mso));
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mso.op = XENMEM_sharing_op_debug_gfn;
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mso.u.debug.u.gfn = gfn;
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return xc_memshr_memop(xch, domid, &mso);
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}
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int xc_memshr_debug_gref(xc_interface *xch,
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domid_t domid,
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grant_ref_t gref)
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{
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xen_mem_sharing_op_t mso;
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memset(&mso, 0, sizeof(mso));
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mso.op = XENMEM_sharing_op_debug_gref;
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mso.u.debug.u.gref = gref;
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return xc_memshr_memop(xch, domid, &mso);
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}
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int xc_memshr_audit(xc_interface *xch)
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{
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xen_mem_sharing_op_t mso;
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memset(&mso, 0, sizeof(mso));
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mso.op = XENMEM_sharing_op_audit;
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return do_memory_op(xch, XENMEM_sharing_op, &mso, sizeof(mso));
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}
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long xc_sharing_freed_pages(xc_interface *xch)
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{
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return do_memory_op(xch, XENMEM_get_sharing_freed_pages, NULL, 0);
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}
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long xc_sharing_used_frames(xc_interface *xch)
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{
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return do_memory_op(xch, XENMEM_get_sharing_shared_pages, NULL, 0);
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}
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