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/* SPDX-License-Identifier: GPL-2.0-or-later */
/******************************************************************************
* arch/x86/hvm/grant_table.c
*
* Grant table interfaces for HVM guests
*
* Copyright (C) 2017 Wei Liu <wei.liu2@citrix.com>
*/
#include <xen/types.h>
#include <public/grant_table.h>
#include <asm/p2m.h>
int create_grant_p2m_mapping(uint64_t addr, mfn_t frame,
unsigned int flags,
unsigned int cache_flags)
{
p2m_type_t p2mt;
int rc;
if ( cache_flags || (flags & ~GNTMAP_readonly) != GNTMAP_host_map )
return GNTST_general_error;
if ( flags & GNTMAP_readonly )
p2mt = p2m_grant_map_ro;
else
p2mt = p2m_grant_map_rw;
rc = p2m_add_page(current->domain, _gfn(addr >> PAGE_SHIFT),
frame, PAGE_ORDER_4K, p2mt);
if ( rc )
return GNTST_general_error;
else
return GNTST_okay;
}
int replace_grant_p2m_mapping(uint64_t addr, mfn_t frame,
uint64_t new_addr, unsigned int flags)
{
unsigned long gfn = (unsigned long)(addr >> PAGE_SHIFT);
p2m_type_t type;
mfn_t old_mfn;
struct domain *d = current->domain;
if ( new_addr != 0 || (flags & GNTMAP_contains_pte) )
return GNTST_general_error;
old_mfn = get_gfn_query(d, gfn, &type);
if ( !p2m_is_grant(type) || !mfn_eq(old_mfn, frame) )
{
put_gfn(d, gfn);
gdprintk(XENLOG_WARNING,
"old mapping invalid (type %d, mfn %" PRI_mfn ", frame %"PRI_mfn")\n",
type, mfn_x(old_mfn), mfn_x(frame));
return GNTST_general_error;
}
if ( p2m_remove_page(d, _gfn(gfn), frame, PAGE_ORDER_4K) )
{
put_gfn(d, gfn);
return GNTST_general_error;
}
put_gfn(d, gfn);
return GNTST_okay;
}
/*
* Local variables:
* mode: C
* c-file-style: "BSD"
* c-basic-offset: 4
* tab-width: 4
* indent-tabs-mode: nil
* End:
*/
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