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Razvan Cojocaru
1ef5056bd6
Currently it is only possible to set mem_access restrictions only for a contiguous range of GFNs (or, as a particular case, for a single GFN). This patch introduces a new libxc function taking an array of GFNs. The alternative would be to set each page in turn, using a userspace-HV roundtrip for each call, and triggering a TLB flush per page set. Signed-off-by: Razvan Cojocaru <rcojocaru@bitdefender.com> Acked-by: Wei Liu <wei.liu2@citrix.com> Acked-by: Jan Beulich <jbeulich@suse.com> Acked-by: Tamas K Lengyel <tamas@tklengyel.com> Acked-by: Julien Grall <julien.grall@arm.com> Acked-by: George Dunlap <george.dunlap@citrix.com>
111 lines
3.1 KiB
C
111 lines
3.1 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, 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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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_set_mem_access_multi(xc_interface *xch,
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domid_t domain_id,
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uint8_t *access,
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uint64_t *pages,
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uint32_t nr)
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{
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DECLARE_HYPERCALL_BOUNCE(access, nr, XC_HYPERCALL_BUFFER_BOUNCE_IN);
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DECLARE_HYPERCALL_BOUNCE(pages, nr * sizeof(uint64_t),
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XC_HYPERCALL_BUFFER_BOUNCE_IN);
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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_set_access_multi,
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.domid = domain_id,
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.access = XENMEM_access_default + 1, /* Invalid value */
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.pfn = ~0UL, /* Invalid GFN */
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.nr = nr,
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};
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if ( xc_hypercall_bounce_pre(xch, pages) ||
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xc_hypercall_bounce_pre(xch, access) )
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{
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PERROR("Could not bounce memory for XENMEM_access_op_set_access_multi");
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return -1;
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}
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set_xen_guest_handle(mao.pfn_list, pages);
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set_xen_guest_handle(mao.access_list, access);
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rc = do_memory_op(xch, XENMEM_access_op, &mao, sizeof(mao));
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xc_hypercall_bounce_post(xch, access);
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xc_hypercall_bounce_post(xch, pages);
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return rc;
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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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