int guest_remove_page(struct domain *d, unsigned long gmfn)
{
struct page_info *page;
#ifdef CONFIG_X86
p2m_type_t p2mt;
#endif
unsigned long mfn;
#ifdef CONFIG_X86
mfn = mfn_x(gfn_to_mfn(p2m_get_hostp2m(d), gmfn, &p2mt));
if ( unlikely(p2m_is_paging(p2mt)) )
{
guest_physmap_remove_page(d, gmfn, mfn, 0);
p2m_mem_paging_drop_page(p2m_get_hostp2m(d), gmfn);
return 1;
}
#else
mfn = gmfn_to_mfn(d, gmfn);
#endif
if ( unlikely(!mfn_valid(mfn)) )
{
gdprintk(XENLOG_INFO, "Domain %u page number %lx invalid\n",
d->domain_id, gmfn);
return 0;
}
page = mfn_to_page(mfn);
#ifdef CONFIG_X86
/* If gmfn is shared, just drop the guest reference (which may or may not
* free the page) */
if(p2m_is_shared(p2mt))
{
put_page_and_type(page);
guest_physmap_remove_page(d, gmfn, mfn, 0);
return 1;
}
#endif /* CONFIG_X86 */
if ( unlikely(!get_page(page, d)) )
{
gdprintk(XENLOG_INFO, "Bad page free for domain %u\n", d->domain_id);
return 0;
}
if ( test_and_clear_bit(_PGT_pinned, &page->u.inuse.type_info) )
put_page_and_type(page);
if ( test_and_clear_bit(_PGC_allocated, &page->count_info) )
put_page(page);
guest_physmap_remove_page(d, gmfn, mfn, 0);
put_page(page);
return 1;
}
int guest_remove_page(struct domain *d, unsigned long gmfn)
{
struct page_info *page;
unsigned long mfn;
mfn = gmfn_to_mfn(d, gmfn);
if ( unlikely(!mfn_valid(mfn)) )
{
gdprintk(XENLOG_INFO, "Domain %u page number %lx invalid\n",
d->domain_id, gmfn);
return 0;
}
page = mfn_to_page(mfn);
if ( unlikely(!get_page(page, d)) )
{
gdprintk(XENLOG_INFO, "Bad page free for domain %u\n", d->domain_id);
return 0;
}
if ( test_and_clear_bit(_PGT_pinned, &page->u.inuse.type_info) )
put_page_and_type(page);
if ( test_and_clear_bit(_PGC_allocated, &page->count_info) )
put_page(page);
guest_physmap_remove_page(d, gmfn, mfn, 0);
put_page(page);
return 1;
}
int guest_remove_page(struct domain *d, unsigned long gmfn)
{
struct page_info *page;
#ifdef CONFIG_X86
p2m_type_t p2mt;
#endif
unsigned long mfn;
#ifdef CONFIG_X86
mfn = mfn_x(get_gfn_query(d, gmfn, &p2mt));
if ( unlikely(p2m_is_paging(p2mt)) )
{
guest_physmap_remove_page(d, gmfn, mfn, 0);
put_gfn(d, gmfn);
/* If the page hasn't yet been paged out, there is an
* actual page that needs to be released. */
if ( p2mt == p2m_ram_paging_out )
{
ASSERT(mfn_valid(mfn));
page = mfn_to_page(mfn);
if ( test_and_clear_bit(_PGC_allocated, &page->count_info) )
put_page(page);
}
p2m_mem_paging_drop_page(d, gmfn, p2mt);
return 1;
}
if ( p2mt == p2m_mmio_direct )
{
clear_mmio_p2m_entry(d, gmfn, _mfn(mfn));
put_gfn(d, gmfn);
return 1;
}
#else
mfn = gmfn_to_mfn(d, gmfn);
#endif
if ( unlikely(!mfn_valid(mfn)) )
{
put_gfn(d, gmfn);
gdprintk(XENLOG_INFO, "Domain %u page number %lx invalid\n",
d->domain_id, gmfn);
return 0;
}
#ifdef CONFIG_X86
if ( p2m_is_shared(p2mt) )
{
/* Unshare the page, bail out on error. We unshare because
* we might be the only one using this shared page, and we
* need to trigger proper cleanup. Once done, this is
* like any other page. */
if ( mem_sharing_unshare_page(d, gmfn, 0) )
{
put_gfn(d, gmfn);
(void)mem_sharing_notify_enomem(d, gmfn, 0);
return 0;
}
/* Maybe the mfn changed */
mfn = mfn_x(get_gfn_query_unlocked(d, gmfn, &p2mt));
ASSERT(!p2m_is_shared(p2mt));
}
#endif /* CONFIG_X86 */
page = mfn_to_page(mfn);
if ( unlikely(!get_page(page, d)) )
{
put_gfn(d, gmfn);
gdprintk(XENLOG_INFO, "Bad page free for domain %u\n", d->domain_id);
return 0;
}
if ( test_and_clear_bit(_PGT_pinned, &page->u.inuse.type_info) )
put_page_and_type(page);
/*
* With the lack of an IOMMU on some platforms, domains with DMA-capable
* device must retrieve the same pfn when the hypercall populate_physmap
* is called.
*
* For this purpose (and to match populate_physmap() behavior), the page
* is kept allocated.
*/
if ( !is_domain_direct_mapped(d) &&
test_and_clear_bit(_PGC_allocated, &page->count_info) )
put_page(page);
guest_physmap_remove_page(d, gmfn, mfn, 0);
put_page(page);
put_gfn(d, gmfn);
return 1;
}
int guest_remove_page(struct domain *d, unsigned long gmfn)
{
struct page_info *page;
#ifdef CONFIG_X86
p2m_type_t p2mt;
#endif
unsigned long mfn;
#ifdef CONFIG_X86
mfn = mfn_x(get_gfn_query(d, gmfn, &p2mt));
if ( unlikely(p2m_is_paging(p2mt)) )
{
guest_physmap_remove_page(d, gmfn, mfn, 0);
put_gfn(d, gmfn);
/* If the page hasn't yet been paged out, there is an
* actual page that needs to be released. */
if ( p2mt == p2m_ram_paging_out )
{
ASSERT(mfn_valid(mfn));
page = mfn_to_page(mfn);
if ( test_and_clear_bit(_PGC_allocated, &page->count_info) )
put_page(page);
}
p2m_mem_paging_drop_page(d, gmfn, p2mt);
return 1;
}
#else
mfn = gmfn_to_mfn(d, gmfn);
#endif
if ( unlikely(!mfn_valid(mfn)) )
{
put_gfn(d, gmfn);
gdprintk(XENLOG_INFO, "Domain %u page number %lx invalid\n",
d->domain_id, gmfn);
return 0;
}
#ifdef CONFIG_X86_64
if ( p2m_is_shared(p2mt) )
{
/* Unshare the page, bail out on error. We unshare because
* we might be the only one using this shared page, and we
* need to trigger proper cleanup. Once done, this is
* like any other page. */
if ( mem_sharing_unshare_page(d, gmfn, 0) )
{
put_gfn(d, gmfn);
(void)mem_sharing_notify_enomem(d, gmfn, 0);
return 0;
}
/* Maybe the mfn changed */
mfn = mfn_x(get_gfn_query_unlocked(d, gmfn, &p2mt));
ASSERT(!p2m_is_shared(p2mt));
}
#endif /* CONFIG_X86_64 */
page = mfn_to_page(mfn);
if ( unlikely(!get_page(page, d)) )
{
put_gfn(d, gmfn);
gdprintk(XENLOG_INFO, "Bad page free for domain %u\n", d->domain_id);
return 0;
}
if ( test_and_clear_bit(_PGT_pinned, &page->u.inuse.type_info) )
put_page_and_type(page);
if ( test_and_clear_bit(_PGC_allocated, &page->count_info) )
put_page(page);
guest_physmap_remove_page(d, gmfn, mfn, 0);
put_page(page);
put_gfn(d, gmfn);
return 1;
}
