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https://github.com/xen-project/xen.git
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Olaf Hering
2c36185d44
Up to now a single ring buffer was used for mem_share, xenpaging and xen-access. Each helper would have to cooperate and pull only its own requests from the ring. Unfortunately this was not implemented. And even if it was, it would make the whole concept fragile because a crash or early exit of one helper would stall the others. What happend up to now is that active xenpaging + memory_sharing would push memsharing requests in the buffer. xenpaging is not prepared for such requests. This patch creates an independet ring buffer for mem_share, xenpaging and xen-access and adds also new functions to enable xenpaging and xen-access. The xc_mem_event_enable/xc_mem_event_disable functions will be removed. The various XEN_DOMCTL_MEM_EVENT_* macros were cleaned up. Due to the removal the API changed, so the SONAME will be changed too. Signed-off-by: Olaf Hering <olaf@aepfle.de> Acked-by: Tim Deegan <tim@xen.org> Acked-by: Ian Jackson <ian.jackson@eu.citrix.com> Committed-by: Tim Deegan <tim@xen.org>
173 lines
5.1 KiB
C
173 lines
5.1 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, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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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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uint32_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_t)domid;
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op = &(domctl.u.mem_sharing_op);
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op->op = XEN_DOMCTL_MEM_EVENT_OP_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_nominate_gfn(xc_interface *xch,
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uint32_t domid,
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unsigned long gfn,
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uint64_t *handle)
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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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int ret;
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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_t)domid;
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op = &(domctl.u.mem_sharing_op);
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op->op = XEN_DOMCTL_MEM_EVENT_OP_SHARING_NOMINATE_GFN;
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op->u.nominate.u.gfn = gfn;
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ret = do_domctl(xch, &domctl);
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if(!ret) *handle = op->u.nominate.handle;
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return ret;
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}
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int xc_memshr_nominate_gref(xc_interface *xch,
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uint32_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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DECLARE_DOMCTL;
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struct xen_domctl_mem_sharing_op *op;
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int ret;
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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_t)domid;
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op = &(domctl.u.mem_sharing_op);
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op->op = XEN_DOMCTL_MEM_EVENT_OP_SHARING_NOMINATE_GREF;
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op->u.nominate.u.grant_ref = gref;
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ret = do_domctl(xch, &domctl);
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if(!ret) *handle = op->u.nominate.handle;
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return ret;
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}
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int xc_memshr_share(xc_interface *xch,
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uint64_t source_handle,
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uint64_t client_handle)
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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 = 0;
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op = &(domctl.u.mem_sharing_op);
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op->op = XEN_DOMCTL_MEM_EVENT_OP_SHARING_SHARE;
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op->u.share.source_handle = source_handle;
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op->u.share.client_handle = client_handle;
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return do_domctl(xch, &domctl);
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}
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int xc_memshr_domain_resume(xc_interface *xch,
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uint32_t domid)
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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_t)domid;
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op = &(domctl.u.mem_sharing_op);
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op->op = XEN_DOMCTL_MEM_EVENT_OP_SHARING_RESUME;
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return do_domctl(xch, &domctl);
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}
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int xc_memshr_debug_gfn(xc_interface *xch,
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uint32_t domid,
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unsigned long gfn)
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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_t)domid;
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op = &(domctl.u.mem_sharing_op);
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op->op = XEN_DOMCTL_MEM_EVENT_OP_SHARING_DEBUG_GFN;
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op->u.debug.u.gfn = gfn;
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return do_domctl(xch, &domctl);
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}
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int xc_memshr_debug_mfn(xc_interface *xch,
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uint32_t domid,
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unsigned long mfn)
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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_t)domid;
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op = &(domctl.u.mem_sharing_op);
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op->op = XEN_DOMCTL_MEM_EVENT_OP_SHARING_DEBUG_MFN;
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op->u.debug.u.mfn = mfn;
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return do_domctl(xch, &domctl);
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}
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int xc_memshr_debug_gref(xc_interface *xch,
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uint32_t domid,
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grant_ref_t gref)
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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_t)domid;
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op = &(domctl.u.mem_sharing_op);
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op->op = XEN_DOMCTL_MEM_EVENT_OP_SHARING_DEBUG_GREF;
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op->u.debug.u.gref = gref;
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return do_domctl(xch, &domctl);
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}
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