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Razvan Cojocaru
9b160a10cf
Vmx_disable_intercept_for_msr() will now refuse to disable interception of MSRs needed for memory introspection. It is not possible to gate this on mem_access being active for the domain, since by the time mem_access does become active the interception for the interesting MSRs has already been disabled (vmx_disable_intercept_for_msr() runs very early on). Signed-off-by: Razvan Cojocaru <rcojocaru@bitdefender.com> Acked-by: Jan Beulich <jbeulich@suse.com> Acked-by: Ian Campbell <ian.campbell@citrix.com> Acked-by: Kevin Tian <kevin.tian@intel.com> Acked-by: Tim Deegan <tim@xen.org>
106 lines
3.0 KiB
C
106 lines
3.0 KiB
C
/******************************************************************************
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*
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* tools/libxc/xc_mem_access.c
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*
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* Interface to low-level memory access mode functionality
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*
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* Copyright (c) 2011 Virtuata, Inc.
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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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void *xc_mem_access_enable(xc_interface *xch, domid_t domain_id, uint32_t *port)
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{
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return xc_mem_event_enable(xch, domain_id, HVM_PARAM_ACCESS_RING_PFN,
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port, 0);
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}
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void *xc_mem_access_enable_introspection(xc_interface *xch, domid_t domain_id,
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uint32_t *port)
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{
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return xc_mem_event_enable(xch, domain_id, HVM_PARAM_ACCESS_RING_PFN,
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port, 1);
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}
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int xc_mem_access_disable(xc_interface *xch, domid_t domain_id)
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{
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return xc_mem_event_control(xch, domain_id,
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XEN_DOMCTL_MEM_EVENT_OP_ACCESS_DISABLE,
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XEN_DOMCTL_MEM_EVENT_OP_ACCESS,
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NULL);
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}
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int xc_mem_access_resume(xc_interface *xch, domid_t domain_id)
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{
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xen_mem_access_op_t mao =
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{
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.op = XENMEM_access_op_resume,
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.domid = domain_id
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};
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return do_memory_op(xch, XENMEM_access_op, &mao, sizeof(mao));
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}
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int xc_set_mem_access(xc_interface *xch,
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domid_t domain_id,
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xenmem_access_t access,
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uint64_t first_pfn,
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uint32_t nr)
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{
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xen_mem_access_op_t mao =
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{
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.op = XENMEM_access_op_set_access,
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.domid = domain_id,
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.access = access,
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.pfn = first_pfn,
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.nr = nr
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};
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return do_memory_op(xch, XENMEM_access_op, &mao, sizeof(mao));
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}
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int xc_get_mem_access(xc_interface *xch,
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domid_t domain_id,
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uint64_t pfn,
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xenmem_access_t *access)
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{
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int rc;
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xen_mem_access_op_t mao =
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{
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.op = XENMEM_access_op_get_access,
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.domid = domain_id,
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.pfn = pfn
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};
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rc = do_memory_op(xch, XENMEM_access_op, &mao, sizeof(mao));
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if ( rc == 0 )
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*access = mao.access;
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return rc;
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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-file-style: "BSD"
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* c-basic-offset: 4
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* indent-tabs-mode: nil
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* End:
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*/
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