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/* SPDX-License-Identifier: GPL-2.0-or-later */
/******************************************************************************
* arch/x86/mm/physmap.c
*
* Parts of this code are Copyright (c) 2009 by Citrix Systems, Inc. (Patrick Colp)
* Parts of this code are Copyright (c) 2007 by Advanced Micro Devices.
* Parts of this code are Copyright (c) 2006-2007 by XenSource Inc.
* Parts of this code are Copyright (c) 2006 by Michael A Fetterman
* Parts based on earlier work by Michael A Fetterman, Ian Pratt et al.
*/
#include <xen/iommu.h>
#include <asm/p2m.h>
#include "mm-locks.h"
int
guest_physmap_add_page(struct domain *d, gfn_t gfn, mfn_t mfn,
unsigned int page_order)
{
/* IOMMU for PV guests is handled in get_page_type() and put_page(). */
if ( !paging_mode_translate(d) )
{
struct page_info *page = mfn_to_page(mfn);
unsigned long i;
/*
* Our interface for PV guests wrt IOMMU entries hasn't been very
* clear; but historically, pages have started out with IOMMU mappings,
* and only lose them when changed to a different page type.
*
* Retain this property by grabbing a writable type ref and then
* dropping it immediately. The result will be pages that have a
* writable type (and an IOMMU entry), but a count of 0 (such that
* any guest-requested type changes succeed and remove the IOMMU
* entry).
*/
for ( i = 0; i < (1UL << page_order); ++i, ++page )
{
if ( !need_iommu_pt_sync(d) )
/* nothing */;
else if ( get_page_and_type(page, d, PGT_writable_page) )
put_page_and_type(page);
else
return -EINVAL;
set_gpfn_from_mfn(mfn_x(mfn) + i, gfn_x(gfn) + i);
}
return 0;
}
return p2m_add_page(d, gfn, mfn, page_order, p2m_ram_rw);
}
int
guest_physmap_remove_page(struct domain *d, gfn_t gfn,
mfn_t mfn, unsigned int page_order)
{
/* IOMMU for PV guests is handled in get_page_type() and put_page(). */
if ( !paging_mode_translate(d) )
return 0;
return p2m_remove_page(d, gfn, mfn, page_order);
}
int set_identity_p2m_entry(struct domain *d, unsigned long gfn,
p2m_access_t p2ma, unsigned int flag)
{
if ( !paging_mode_translate(d) )
{
if ( !is_iommu_enabled(d) )
return 0;
return iommu_legacy_map(d, _dfn(gfn), _mfn(gfn),
1ul << PAGE_ORDER_4K,
p2m_access_to_iommu_flags(p2ma));
}
return p2m_add_identity_entry(d, gfn, p2ma, flag);
}
int clear_identity_p2m_entry(struct domain *d, unsigned long gfn)
{
if ( !paging_mode_translate(d) )
{
if ( !is_iommu_enabled(d) )
return 0;
return iommu_legacy_unmap(d, _dfn(gfn), 1ul << PAGE_ORDER_4K);
}
return p2m_remove_identity_entry(d, gfn);
}
/*
* Local variables:
* mode: C
* c-file-style: "BSD"
* c-basic-offset: 4
* indent-tabs-mode: nil
* End:
*/
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