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/* SPDX-License-Identifier: GPL-2.0-or-later */
/******************************************************************************
* arch/x86/mm/p2m-basic.c
*
* Basic P2M management largely applicable to all domain types.
*
* 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/event.h>
#include <xen/types.h>
#include <asm/p2m.h>
#include "mm-locks.h"
#include "p2m.h"
/* Init the datastructures for later use by the p2m code */
static int p2m_initialise(struct domain *d, struct p2m_domain *p2m)
{
int ret = 0;
#ifdef CONFIG_HVM
mm_rwlock_init(&p2m->lock);
INIT_PAGE_LIST_HEAD(&p2m->pages);
spin_lock_init(&p2m->ioreq.lock);
#endif
p2m->domain = d;
p2m->default_access = p2m_access_rwx;
p2m->p2m_class = p2m_host;
if ( !is_hvm_domain(d) )
return 0;
p2m_pod_init(p2m);
p2m_nestedp2m_init(p2m);
if ( hap_enabled(d) && cpu_has_vmx )
ret = ept_p2m_init(p2m);
else
p2m_pt_init(p2m);
return ret;
}
struct p2m_domain *p2m_init_one(struct domain *d)
{
struct p2m_domain *p2m = xzalloc(struct p2m_domain);
if ( !p2m )
return NULL;
if ( !zalloc_cpumask_var(&p2m->dirty_cpumask) )
goto free_p2m;
if ( p2m_initialise(d, p2m) )
goto free_cpumask;
return p2m;
free_cpumask:
free_cpumask_var(p2m->dirty_cpumask);
free_p2m:
xfree(p2m);
return NULL;
}
void p2m_free_one(struct p2m_domain *p2m)
{
p2m_free_logdirty(p2m);
if ( hap_enabled(p2m->domain) && cpu_has_vmx )
ept_p2m_uninit(p2m);
free_cpumask_var(p2m->dirty_cpumask);
xfree(p2m);
}
static int p2m_init_hostp2m(struct domain *d)
{
struct p2m_domain *p2m = p2m_init_one(d);
int rc;
if ( !p2m )
return -ENOMEM;
rc = p2m_init_logdirty(p2m);
if ( !rc )
d->arch.p2m = p2m;
else
p2m_free_one(p2m);
return rc;
}
static void p2m_teardown_hostp2m(struct domain *d)
{
/* Iterate over all p2m tables per domain */
struct p2m_domain *p2m = p2m_get_hostp2m(d);
if ( p2m )
{
p2m_free_one(p2m);
d->arch.p2m = NULL;
}
}
int p2m_init(struct domain *d)
{
int rc;
rc = p2m_init_hostp2m(d);
if ( rc || !is_hvm_domain(d) )
return rc;
/*
* Must initialise nestedp2m unconditionally
* since nestedhvm_enabled(d) returns false here.
* (p2m_init runs too early for HVM_PARAM_* options)
*/
rc = p2m_init_nestedp2m(d);
if ( rc )
{
p2m_teardown_hostp2m(d);
return rc;
}
rc = p2m_init_altp2m(d);
if ( rc )
{
p2m_teardown_hostp2m(d);
p2m_teardown_nestedp2m(d);
}
return rc;
}
/*
* Return all the p2m pages to Xen.
* We know we don't have any extra mappings to these pages.
*
* hvm fixme: when adding support for pvh non-hardware domains, this path must
* cleanup any foreign p2m types (release refcnts on them).
*/
void p2m_teardown(struct p2m_domain *p2m, bool remove_root, bool *preempted)
{
#ifdef CONFIG_HVM
struct page_info *pg, *root_pg = NULL;
struct domain *d;
unsigned int i = 0;
if ( !p2m )
return;
d = p2m->domain;
p2m_lock(p2m);
#ifdef CONFIG_MEM_SHARING
ASSERT(atomic_read(&d->shr_pages) == 0);
#endif
if ( remove_root )
p2m->phys_table = pagetable_null();
else if ( !pagetable_is_null(p2m->phys_table) )
{
root_pg = pagetable_get_page(p2m->phys_table);
clear_domain_page(pagetable_get_mfn(p2m->phys_table));
}
while ( (pg = page_list_remove_head(&p2m->pages)) )
{
if ( pg == root_pg )
continue;
d->arch.paging.free_page(d, pg);
/* Arbitrarily check preemption every 1024 iterations */
if ( preempted && !(++i % 1024) && general_preempt_check() )
{
*preempted = true;
break;
}
}
if ( root_pg )
page_list_add(root_pg, &p2m->pages);
p2m_unlock(p2m);
#endif
}
void p2m_final_teardown(struct domain *d)
{
if ( is_hvm_domain(d) )
{
/*
* We must tear down both of them unconditionally because
* we initialise them unconditionally.
*/
p2m_teardown_altp2m(d);
p2m_teardown_nestedp2m(d);
}
/* Iterate over all p2m tables per domain */
p2m_teardown_hostp2m(d);
}
/*
* Local variables:
* mode: C
* c-file-style: "BSD"
* c-basic-offset: 4
* indent-tabs-mode: nil
* End:
*/
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