[PATCH v2 16/34] s390: Convert various gmap functions to use ptdescs

From: "Vishal Moola (Oracle)" <vishal.moola@gmail.com>
To: Andrew Morton <akpm@linux-foundation.org>,
	Matthew Wilcox <willy@infradead.org>
Cc: linux-mm@kvack.org, linux-arch@vger.kernel.org,
	linux-arm-kernel@lists.infradead.org, linux-csky@vger.kernel.org,
	linux-hexagon@vger.kernel.org, loongarch@lists.linux.dev,
	linux-m68k@lists.linux-m68k.org, linux-mips@vger.kernel.org,
	linux-openrisc@vger.kernel.org, linuxppc-dev@lists.ozlabs.org,
	linux-riscv@lists.infradead.org, linux-s390@vger.kernel.org,
	linux-sh@vger.kernel.org, sparclinux@vger.kernel.org,
	linux-um@lists.infradead.org, xen-devel@lists.xenproject.org,
	kvm@vger.kernel.org,
	"Vishal Moola (Oracle)" <vishal.moola@gmail.com>
Subject: [PATCH v2 16/34] s390: Convert various gmap functions to use ptdescs
Date: Mon,  1 May 2023 12:28:11 -0700	[thread overview]
Message-ID: <20230501192829.17086-17-vishal.moola@gmail.com> (raw)
In-Reply-To: <20230501192829.17086-1-vishal.moola@gmail.com>

In order to split struct ptdesc from struct page, convert various
functions to use ptdescs.

Some of the functions use the *get*page*() helper functions. Convert
these to use ptdesc_alloc() and ptdesc_address() instead to help
standardize page tables further.

Signed-off-by: Vishal Moola (Oracle) <vishal.moola@gmail.com>
---
 arch/s390/mm/gmap.c | 230 ++++++++++++++++++++++++--------------------
 1 file changed, 128 insertions(+), 102 deletions(-)

diff --git a/arch/s390/mm/gmap.c b/arch/s390/mm/gmap.c
index a9e8b1805894..e833a7e81fbd 100644
--- a/arch/s390/mm/gmap.c
+++ b/arch/s390/mm/gmap.c
@@ -34,7 +34,7 @@
 static struct gmap *gmap_alloc(unsigned long limit)
 {
 	struct gmap *gmap;
-	struct page *page;
+	struct ptdesc *ptdesc;
 	unsigned long *table;
 	unsigned long etype, atype;
 
@@ -67,12 +67,12 @@ static struct gmap *gmap_alloc(unsigned long limit)
 	spin_lock_init(&gmap->guest_table_lock);
 	spin_lock_init(&gmap->shadow_lock);
 	refcount_set(&gmap->ref_count, 1);
-	page = alloc_pages(GFP_KERNEL_ACCOUNT, CRST_ALLOC_ORDER);
-	if (!page)
+	ptdesc = ptdesc_alloc(GFP_KERNEL_ACCOUNT, CRST_ALLOC_ORDER);
+	if (!ptdesc)
 		goto out_free;
-	page->_pt_s390_gaddr = 0;
-	list_add(&page->lru, &gmap->crst_list);
-	table = page_to_virt(page);
+	ptdesc->_pt_s390_gaddr = 0;
+	list_add(&ptdesc->pt_list, &gmap->crst_list);
+	table = ptdesc_to_virt(ptdesc);
 	crst_table_init(table, etype);
 	gmap->table = table;
 	gmap->asce = atype | _ASCE_TABLE_LENGTH |
@@ -181,25 +181,25 @@ static void gmap_rmap_radix_tree_free(struct radix_tree_root *root)
  */
 static void gmap_free(struct gmap *gmap)
 {
-	struct page *page, *next;
+	struct ptdesc *ptdesc, *next;
 
 	/* Flush tlb of all gmaps (if not already done for shadows) */
 	if (!(gmap_is_shadow(gmap) && gmap->removed))
 		gmap_flush_tlb(gmap);
 	/* Free all segment & region tables. */
-	list_for_each_entry_safe(page, next, &gmap->crst_list, lru) {
-		page->_pt_s390_gaddr = 0;
-		__free_pages(page, CRST_ALLOC_ORDER);
+	list_for_each_entry_safe(ptdesc, next, &gmap->crst_list, pt_list) {
+		ptdesc->_pt_s390_gaddr = 0;
+		ptdesc_free(ptdesc);
 	}
 	gmap_radix_tree_free(&gmap->guest_to_host);
 	gmap_radix_tree_free(&gmap->host_to_guest);
 
 	/* Free additional data for a shadow gmap */
 	if (gmap_is_shadow(gmap)) {
-		/* Free all page tables. */
-		list_for_each_entry_safe(page, next, &gmap->pt_list, lru) {
-			page->_pt_s390_gaddr = 0;
-			page_table_free_pgste(page);
+		/* Free all ptdesc tables. */
+		list_for_each_entry_safe(ptdesc, next, &gmap->pt_list, pt_list) {
+			ptdesc->_pt_s390_gaddr = 0;
+			page_table_free_pgste(ptdesc_page(ptdesc));
 		}
 		gmap_rmap_radix_tree_free(&gmap->host_to_rmap);
 		/* Release reference to the parent */
@@ -308,27 +308,27 @@ EXPORT_SYMBOL_GPL(gmap_get_enabled);
 static int gmap_alloc_table(struct gmap *gmap, unsigned long *table,
 			    unsigned long init, unsigned long gaddr)
 {
-	struct page *page;
+	struct ptdesc *ptdesc;
 	unsigned long *new;
 
 	/* since we dont free the gmap table until gmap_free we can unlock */
-	page = alloc_pages(GFP_KERNEL_ACCOUNT, CRST_ALLOC_ORDER);
-	if (!page)
+	ptdesc = ptdesc_alloc(GFP_KERNEL_ACCOUNT, CRST_ALLOC_ORDER);
+	if (!ptdesc)
 		return -ENOMEM;
-	new = page_to_virt(page);
+	new = ptdesc_to_virt(ptdesc);
 	crst_table_init(new, init);
 	spin_lock(&gmap->guest_table_lock);
 	if (*table & _REGION_ENTRY_INVALID) {
-		list_add(&page->lru, &gmap->crst_list);
+		list_add(&ptdesc->pt_list, &gmap->crst_list);
 		*table = __pa(new) | _REGION_ENTRY_LENGTH |
 			(*table & _REGION_ENTRY_TYPE_MASK);
-		page->_pt_s390_gaddr = gaddr;
-		page = NULL;
+		ptdesc->_pt_s390_gaddr = gaddr;
+		ptdesc = NULL;
 	}
 	spin_unlock(&gmap->guest_table_lock);
-	if (page) {
-		page->_pt_s390_gaddr = 0;
-		__free_pages(page, CRST_ALLOC_ORDER);
+	if (ptdesc) {
+		ptdesc->_pt_s390_gaddr = 0;
+		ptdesc_free(ptdesc);
 	}
 	return 0;
 }
@@ -341,15 +341,15 @@ static int gmap_alloc_table(struct gmap *gmap, unsigned long *table,
  */
 static unsigned long __gmap_segment_gaddr(unsigned long *entry)
 {
-	struct page *page;
+	struct ptdesc *ptdesc;
 	unsigned long offset, mask;
 
 	offset = (unsigned long) entry / sizeof(unsigned long);
 	offset = (offset & (PTRS_PER_PMD - 1)) * PMD_SIZE;
 	mask = ~(PTRS_PER_PMD * sizeof(pmd_t) - 1);
-	page = virt_to_page((void *)((unsigned long) entry & mask));
+	ptdesc = virt_to_ptdesc((void *)((unsigned long) entry & mask));
 
-	return page->_pt_s390_gaddr + offset;
+	return ptdesc->_pt_s390_gaddr + offset;
 }
 
 /**
@@ -1345,6 +1345,7 @@ static void gmap_unshadow_pgt(struct gmap *sg, unsigned long raddr)
 	unsigned long *ste;
 	phys_addr_t sto, pgt;
 	struct page *page;
+	struct ptdesc *ptdesc;
 
 	BUG_ON(!gmap_is_shadow(sg));
 	ste = gmap_table_walk(sg, raddr, 1); /* get segment pointer */
@@ -1358,9 +1359,11 @@ static void gmap_unshadow_pgt(struct gmap *sg, unsigned long raddr)
 	__gmap_unshadow_pgt(sg, raddr, __va(pgt));
 	/* Free page table */
 	page = phys_to_page(pgt);
-	list_del(&page->lru);
-	page->_pt_s390_gaddr = 0;
-	page_table_free_pgste(page);
+
+	ptdesc = page_ptdesc(page);
+	list_del(&ptdesc->pt_list);
+	ptdesc->_pt_s390_gaddr = 0;
+	page_table_free_pgste(ptdesc_page(ptdesc));
 }
 
 /**
@@ -1374,9 +1377,10 @@ static void gmap_unshadow_pgt(struct gmap *sg, unsigned long raddr)
 static void __gmap_unshadow_sgt(struct gmap *sg, unsigned long raddr,
 				unsigned long *sgt)
 {
-	struct page *page;
 	phys_addr_t pgt;
 	int i;
+	struct page *page;
+	struct ptdesc *ptdesc;
 
 	BUG_ON(!gmap_is_shadow(sg));
 	for (i = 0; i < _CRST_ENTRIES; i++, raddr += _SEGMENT_SIZE) {
@@ -1387,9 +1391,11 @@ static void __gmap_unshadow_sgt(struct gmap *sg, unsigned long raddr,
 		__gmap_unshadow_pgt(sg, raddr, __va(pgt));
 		/* Free page table */
 		page = phys_to_page(pgt);
-		list_del(&page->lru);
-		page->_pt_s390_gaddr = 0;
-		page_table_free_pgste(page);
+
+		ptdesc = page_ptdesc(page);
+		list_del(&ptdesc->pt_list);
+		ptdesc->_pt_s390_gaddr = 0;
+		page_table_free_pgste(ptdesc_page(ptdesc));
 	}
 }
 
@@ -1405,6 +1411,7 @@ static void gmap_unshadow_sgt(struct gmap *sg, unsigned long raddr)
 	unsigned long r3o, *r3e;
 	phys_addr_t sgt;
 	struct page *page;
+	struct ptdesc *ptdesc;
 
 	BUG_ON(!gmap_is_shadow(sg));
 	r3e = gmap_table_walk(sg, raddr, 2); /* get region-3 pointer */
@@ -1418,9 +1425,11 @@ static void gmap_unshadow_sgt(struct gmap *sg, unsigned long raddr)
 	__gmap_unshadow_sgt(sg, raddr, __va(sgt));
 	/* Free segment table */
 	page = phys_to_page(sgt);
-	list_del(&page->lru);
-	page->_pt_s390_gaddr = 0;
-	__free_pages(page, CRST_ALLOC_ORDER);
+
+	ptdesc = page_ptdesc(page);
+	list_del(&ptdesc->pt_list);
+	ptdesc->_pt_s390_gaddr = 0;
+	ptdesc_free(ptdesc);
 }
 
 /**
@@ -1434,9 +1443,10 @@ static void gmap_unshadow_sgt(struct gmap *sg, unsigned long raddr)
 static void __gmap_unshadow_r3t(struct gmap *sg, unsigned long raddr,
 				unsigned long *r3t)
 {
-	struct page *page;
 	phys_addr_t sgt;
 	int i;
+	struct page *page;
+	struct ptdesc *ptdesc;
 
 	BUG_ON(!gmap_is_shadow(sg));
 	for (i = 0; i < _CRST_ENTRIES; i++, raddr += _REGION3_SIZE) {
@@ -1447,9 +1457,11 @@ static void __gmap_unshadow_r3t(struct gmap *sg, unsigned long raddr,
 		__gmap_unshadow_sgt(sg, raddr, __va(sgt));
 		/* Free segment table */
 		page = phys_to_page(sgt);
-		list_del(&page->lru);
-		page->_pt_s390_gaddr = 0;
-		__free_pages(page, CRST_ALLOC_ORDER);
+
+		ptdesc = page_ptdesc(page);
+		list_del(&ptdesc->pt_list);
+		ptdesc->_pt_s390_gaddr = 0;
+		ptdesc_free(ptdesc);
 	}
 }
 
@@ -1465,6 +1477,7 @@ static void gmap_unshadow_r3t(struct gmap *sg, unsigned long raddr)
 	unsigned long r2o, *r2e;
 	phys_addr_t r3t;
 	struct page *page;
+	struct ptdesc *ptdesc;
 
 	BUG_ON(!gmap_is_shadow(sg));
 	r2e = gmap_table_walk(sg, raddr, 3); /* get region-2 pointer */
@@ -1478,9 +1491,11 @@ static void gmap_unshadow_r3t(struct gmap *sg, unsigned long raddr)
 	__gmap_unshadow_r3t(sg, raddr, __va(r3t));
 	/* Free region 3 table */
 	page = phys_to_page(r3t);
-	list_del(&page->lru);
-	page->_pt_s390_gaddr = 0;
-	__free_pages(page, CRST_ALLOC_ORDER);
+
+	ptdesc = page_ptdesc(page);
+	list_del(&ptdesc->pt_list);
+	ptdesc->_pt_s390_gaddr = 0;
+	ptdesc_free(ptdesc);
 }
 
 /**
@@ -1495,8 +1510,9 @@ static void __gmap_unshadow_r2t(struct gmap *sg, unsigned long raddr,
 				unsigned long *r2t)
 {
 	phys_addr_t r3t;
-	struct page *page;
 	int i;
+	struct page *page;
+	struct ptdesc *ptdesc;
 
 	BUG_ON(!gmap_is_shadow(sg));
 	for (i = 0; i < _CRST_ENTRIES; i++, raddr += _REGION2_SIZE) {
@@ -1507,9 +1523,11 @@ static void __gmap_unshadow_r2t(struct gmap *sg, unsigned long raddr,
 		__gmap_unshadow_r3t(sg, raddr, __va(r3t));
 		/* Free region 3 table */
 		page = phys_to_page(r3t);
-		list_del(&page->lru);
-		page->_pt_s390_gaddr = 0;
-		__free_pages(page, CRST_ALLOC_ORDER);
+
+		ptdesc = page_ptdesc(page);
+		list_del(&ptdesc->pt_list);
+		ptdesc->_pt_s390_gaddr = 0;
+		ptdesc_free(ptdesc);
 	}
 }
 
@@ -1525,6 +1543,7 @@ static void gmap_unshadow_r2t(struct gmap *sg, unsigned long raddr)
 	unsigned long r1o, *r1e;
 	struct page *page;
 	phys_addr_t r2t;
+	struct ptdesc *ptdesc;
 
 	BUG_ON(!gmap_is_shadow(sg));
 	r1e = gmap_table_walk(sg, raddr, 4); /* get region-1 pointer */
@@ -1538,9 +1557,11 @@ static void gmap_unshadow_r2t(struct gmap *sg, unsigned long raddr)
 	__gmap_unshadow_r2t(sg, raddr, __va(r2t));
 	/* Free region 2 table */
 	page = phys_to_page(r2t);
-	list_del(&page->lru);
-	page->_pt_s390_gaddr = 0;
-	__free_pages(page, CRST_ALLOC_ORDER);
+
+	ptdesc = page_ptdesc(page);
+	list_del(&ptdesc->pt_list);
+	ptdesc->_pt_s390_gaddr = 0;
+	ptdesc_free(ptdesc);
 }
 
 /**
@@ -1558,6 +1579,7 @@ static void __gmap_unshadow_r1t(struct gmap *sg, unsigned long raddr,
 	struct page *page;
 	phys_addr_t r2t;
 	int i;
+	struct ptdesc *ptdesc;
 
 	BUG_ON(!gmap_is_shadow(sg));
 	asce = __pa(r1t) | _ASCE_TYPE_REGION1;
@@ -1571,9 +1593,11 @@ static void __gmap_unshadow_r1t(struct gmap *sg, unsigned long raddr,
 		r1t[i] = _REGION1_ENTRY_EMPTY;
 		/* Free region 2 table */
 		page = phys_to_page(r2t);
-		list_del(&page->lru);
-		page->_pt_s390_gaddr = 0;
-		__free_pages(page, CRST_ALLOC_ORDER);
+
+		ptdesc = page_ptdesc(page);
+		list_del(&ptdesc->pt_list);
+		ptdesc->_pt_s390_gaddr = 0;
+		ptdesc_free(ptdesc);
 	}
 }
 
@@ -1770,18 +1794,18 @@ int gmap_shadow_r2t(struct gmap *sg, unsigned long saddr, unsigned long r2t,
 	unsigned long raddr, origin, offset, len;
 	unsigned long *table;
 	phys_addr_t s_r2t;
-	struct page *page;
+	struct ptdesc *ptdesc;
 	int rc;
 
 	BUG_ON(!gmap_is_shadow(sg));
 	/* Allocate a shadow region second table */
-	page = alloc_pages(GFP_KERNEL_ACCOUNT, CRST_ALLOC_ORDER);
-	if (!page)
+	ptdesc = ptdesc_alloc(GFP_KERNEL_ACCOUNT, CRST_ALLOC_ORDER);
+	if (!ptdesc)
 		return -ENOMEM;
-	page->_pt_s390_gaddr = r2t & _REGION_ENTRY_ORIGIN;
+	ptdesc->_pt_s390_gaddr = r2t & _REGION_ENTRY_ORIGIN;
 	if (fake)
-		page->_pt_s390_gaddr |= GMAP_SHADOW_FAKE_TABLE;
-	s_r2t = page_to_phys(page);
+		ptdesc->_pt_s390_gaddr |= GMAP_SHADOW_FAKE_TABLE;
+	s_r2t = page_to_phys(ptdesc_page(ptdesc));
 	/* Install shadow region second table */
 	spin_lock(&sg->guest_table_lock);
 	table = gmap_table_walk(sg, saddr, 4); /* get region-1 pointer */
@@ -1802,7 +1826,7 @@ int gmap_shadow_r2t(struct gmap *sg, unsigned long saddr, unsigned long r2t,
 		 _REGION_ENTRY_TYPE_R1 | _REGION_ENTRY_INVALID;
 	if (sg->edat_level >= 1)
 		*table |= (r2t & _REGION_ENTRY_PROTECT);
-	list_add(&page->lru, &sg->crst_list);
+	list_add(&ptdesc->pt_list, &sg->crst_list);
 	if (fake) {
 		/* nothing to protect for fake tables */
 		*table &= ~_REGION_ENTRY_INVALID;
@@ -1830,8 +1854,8 @@ int gmap_shadow_r2t(struct gmap *sg, unsigned long saddr, unsigned long r2t,
 	return rc;
 out_free:
 	spin_unlock(&sg->guest_table_lock);
-	page->_pt_s390_gaddr = 0;
-	__free_pages(page, CRST_ALLOC_ORDER);
+	ptdesc->_pt_s390_gaddr = 0;
+	ptdesc_free(ptdesc);
 	return rc;
 }
 EXPORT_SYMBOL_GPL(gmap_shadow_r2t);
@@ -1855,18 +1879,18 @@ int gmap_shadow_r3t(struct gmap *sg, unsigned long saddr, unsigned long r3t,
 	unsigned long raddr, origin, offset, len;
 	unsigned long *table;
 	phys_addr_t s_r3t;
-	struct page *page;
+	struct ptdesc *ptdesc;
 	int rc;
 
 	BUG_ON(!gmap_is_shadow(sg));
 	/* Allocate a shadow region second table */
-	page = alloc_pages(GFP_KERNEL_ACCOUNT, CRST_ALLOC_ORDER);
-	if (!page)
+	ptdesc = ptdesc_alloc(GFP_KERNEL_ACCOUNT, CRST_ALLOC_ORDER);
+	if (!ptdesc)
 		return -ENOMEM;
-	page->_pt_s390_gaddr = r3t & _REGION_ENTRY_ORIGIN;
+	ptdesc->_pt_s390_gaddr = r3t & _REGION_ENTRY_ORIGIN;
 	if (fake)
-		page->_pt_s390_gaddr |= GMAP_SHADOW_FAKE_TABLE;
-	s_r3t = page_to_phys(page);
+		ptdesc->_pt_s390_gaddr |= GMAP_SHADOW_FAKE_TABLE;
+	s_r3t = page_to_phys(ptdesc_page(ptdesc));
 	/* Install shadow region second table */
 	spin_lock(&sg->guest_table_lock);
 	table = gmap_table_walk(sg, saddr, 3); /* get region-2 pointer */
@@ -1887,7 +1911,7 @@ int gmap_shadow_r3t(struct gmap *sg, unsigned long saddr, unsigned long r3t,
 		 _REGION_ENTRY_TYPE_R2 | _REGION_ENTRY_INVALID;
 	if (sg->edat_level >= 1)
 		*table |= (r3t & _REGION_ENTRY_PROTECT);
-	list_add(&page->lru, &sg->crst_list);
+	list_add(&ptdesc->pt_list, &sg->crst_list);
 	if (fake) {
 		/* nothing to protect for fake tables */
 		*table &= ~_REGION_ENTRY_INVALID;
@@ -1915,8 +1939,8 @@ int gmap_shadow_r3t(struct gmap *sg, unsigned long saddr, unsigned long r3t,
 	return rc;
 out_free:
 	spin_unlock(&sg->guest_table_lock);
-	page->_pt_s390_gaddr = 0;
-	__free_pages(page, CRST_ALLOC_ORDER);
+	ptdesc->_pt_s390_gaddr = 0;
+	ptdesc_free(ptdesc);
 	return rc;
 }
 EXPORT_SYMBOL_GPL(gmap_shadow_r3t);
@@ -1940,18 +1964,18 @@ int gmap_shadow_sgt(struct gmap *sg, unsigned long saddr, unsigned long sgt,
 	unsigned long raddr, origin, offset, len;
 	unsigned long *table;
 	phys_addr_t s_sgt;
-	struct page *page;
+	struct ptdesc *ptdesc;
 	int rc;
 
 	BUG_ON(!gmap_is_shadow(sg) || (sgt & _REGION3_ENTRY_LARGE));
 	/* Allocate a shadow segment table */
-	page = alloc_pages(GFP_KERNEL_ACCOUNT, CRST_ALLOC_ORDER);
-	if (!page)
+	ptdesc = ptdesc_alloc(GFP_KERNEL_ACCOUNT, CRST_ALLOC_ORDER);
+	if (!ptdesc)
 		return -ENOMEM;
-	page->_pt_s390_gaddr = sgt & _REGION_ENTRY_ORIGIN;
+	ptdesc->_pt_s390_gaddr = sgt & _REGION_ENTRY_ORIGIN;
 	if (fake)
-		page->_pt_s390_gaddr |= GMAP_SHADOW_FAKE_TABLE;
-	s_sgt = page_to_phys(page);
+		ptdesc->_pt_s390_gaddr |= GMAP_SHADOW_FAKE_TABLE;
+	s_sgt = page_to_phys(ptdesc_page(ptdesc));
 	/* Install shadow region second table */
 	spin_lock(&sg->guest_table_lock);
 	table = gmap_table_walk(sg, saddr, 2); /* get region-3 pointer */
@@ -1972,7 +1996,7 @@ int gmap_shadow_sgt(struct gmap *sg, unsigned long saddr, unsigned long sgt,
 		 _REGION_ENTRY_TYPE_R3 | _REGION_ENTRY_INVALID;
 	if (sg->edat_level >= 1)
 		*table |= sgt & _REGION_ENTRY_PROTECT;
-	list_add(&page->lru, &sg->crst_list);
+	list_add(&ptdesc->pt_list, &sg->crst_list);
 	if (fake) {
 		/* nothing to protect for fake tables */
 		*table &= ~_REGION_ENTRY_INVALID;
@@ -2000,8 +2024,8 @@ int gmap_shadow_sgt(struct gmap *sg, unsigned long saddr, unsigned long sgt,
 	return rc;
 out_free:
 	spin_unlock(&sg->guest_table_lock);
-	page->_pt_s390_gaddr = 0;
-	__free_pages(page, CRST_ALLOC_ORDER);
+	ptdesc->_pt_s390_gaddr = 0;
+	ptdesc_free(ptdesc);
 	return rc;
 }
 EXPORT_SYMBOL_GPL(gmap_shadow_sgt);
@@ -2024,8 +2048,9 @@ int gmap_shadow_pgt_lookup(struct gmap *sg, unsigned long saddr,
 			   int *fake)
 {
 	unsigned long *table;
-	struct page *page;
 	int rc;
+	struct page *page;
+	struct ptdesc *ptdesc;
 
 	BUG_ON(!gmap_is_shadow(sg));
 	spin_lock(&sg->guest_table_lock);
@@ -2033,9 +2058,10 @@ int gmap_shadow_pgt_lookup(struct gmap *sg, unsigned long saddr,
 	if (table && !(*table & _SEGMENT_ENTRY_INVALID)) {
 		/* Shadow page tables are full pages (pte+pgste) */
 		page = pfn_to_page(*table >> PAGE_SHIFT);
-		*pgt = page->_pt_s390_gaddr & ~GMAP_SHADOW_FAKE_TABLE;
+		ptdesc = page_ptdesc(page);
+		*pgt = ptdesc->_pt_s390_gaddr & ~GMAP_SHADOW_FAKE_TABLE;
 		*dat_protection = !!(*table & _SEGMENT_ENTRY_PROTECT);
-		*fake = !!(page->_pt_s390_gaddr & GMAP_SHADOW_FAKE_TABLE);
+		*fake = !!(ptdesc->_pt_s390_gaddr & GMAP_SHADOW_FAKE_TABLE);
 		rc = 0;
 	} else  {
 		rc = -EAGAIN;
@@ -2064,19 +2090,19 @@ int gmap_shadow_pgt(struct gmap *sg, unsigned long saddr, unsigned long pgt,
 {
 	unsigned long raddr, origin;
 	unsigned long *table;
-	struct page *page;
+	struct ptdesc *ptdesc;
 	phys_addr_t s_pgt;
 	int rc;
 
 	BUG_ON(!gmap_is_shadow(sg) || (pgt & _SEGMENT_ENTRY_LARGE));
 	/* Allocate a shadow page table */
-	page = page_table_alloc_pgste(sg->mm);
-	if (!page)
+	ptdesc = page_ptdesc(page_table_alloc_pgste(sg->mm));
+	if (!ptdesc)
 		return -ENOMEM;
-	page->_pt_s390_gaddr = pgt & _SEGMENT_ENTRY_ORIGIN;
+	ptdesc->_pt_s390_gaddr = pgt & _SEGMENT_ENTRY_ORIGIN;
 	if (fake)
-		page->_pt_s390_gaddr |= GMAP_SHADOW_FAKE_TABLE;
-	s_pgt = page_to_phys(page);
+		ptdesc->_pt_s390_gaddr |= GMAP_SHADOW_FAKE_TABLE;
+	s_pgt = page_to_phys(ptdesc_page(ptdesc));
 	/* Install shadow page table */
 	spin_lock(&sg->guest_table_lock);
 	table = gmap_table_walk(sg, saddr, 1); /* get segment pointer */
@@ -2094,7 +2120,7 @@ int gmap_shadow_pgt(struct gmap *sg, unsigned long saddr, unsigned long pgt,
 	/* mark as invalid as long as the parent table is not protected */
 	*table = (unsigned long) s_pgt | _SEGMENT_ENTRY |
 		 (pgt & _SEGMENT_ENTRY_PROTECT) | _SEGMENT_ENTRY_INVALID;
-	list_add(&page->lru, &sg->pt_list);
+	list_add(&ptdesc->pt_list, &sg->pt_list);
 	if (fake) {
 		/* nothing to protect for fake tables */
 		*table &= ~_SEGMENT_ENTRY_INVALID;
@@ -2120,8 +2146,8 @@ int gmap_shadow_pgt(struct gmap *sg, unsigned long saddr, unsigned long pgt,
 	return rc;
 out_free:
 	spin_unlock(&sg->guest_table_lock);
-	page->_pt_s390_gaddr = 0;
-	page_table_free_pgste(page);
+	ptdesc->_pt_s390_gaddr = 0;
+	page_table_free_pgste(ptdesc_page(ptdesc));
 	return rc;
 
 }
@@ -2814,11 +2840,11 @@ EXPORT_SYMBOL_GPL(__s390_uv_destroy_range);
  */
 void s390_unlist_old_asce(struct gmap *gmap)
 {
-	struct page *old;
+	struct ptdesc *old;
 
-	old = virt_to_page(gmap->table);
+	old = virt_to_ptdesc(gmap->table);
 	spin_lock(&gmap->guest_table_lock);
-	list_del(&old->lru);
+	list_del(&old->pt_list);
 	/*
 	 * Sometimes the topmost page might need to be "removed" multiple
 	 * times, for example if the VM is rebooted into secure mode several
@@ -2833,7 +2859,7 @@ void s390_unlist_old_asce(struct gmap *gmap)
 	 * pointers, so list_del can work (and do nothing) without
 	 * dereferencing stale or invalid pointers.
 	 */
-	INIT_LIST_HEAD(&old->lru);
+	INIT_LIST_HEAD(&old->pt_list);
 	spin_unlock(&gmap->guest_table_lock);
 }
 EXPORT_SYMBOL_GPL(s390_unlist_old_asce);
@@ -2851,15 +2877,15 @@ EXPORT_SYMBOL_GPL(s390_unlist_old_asce);
 int s390_replace_asce(struct gmap *gmap)
 {
 	unsigned long asce;
-	struct page *page;
+	struct ptdesc *ptdesc;
 	void *table;
 
 	s390_unlist_old_asce(gmap);
 
-	page = alloc_pages(GFP_KERNEL_ACCOUNT, CRST_ALLOC_ORDER);
-	if (!page)
+	ptdesc = ptdesc_alloc(GFP_KERNEL_ACCOUNT, CRST_ALLOC_ORDER);
+	if (!ptdesc)
 		return -ENOMEM;
-	table = page_to_virt(page);
+	table = ptdesc_to_virt(ptdesc);
 	memcpy(table, gmap->table, 1UL << (CRST_ALLOC_ORDER + PAGE_SHIFT));
 
 	/*
@@ -2868,7 +2894,7 @@ int s390_replace_asce(struct gmap *gmap)
 	 * it will be freed when the VM is torn down.
 	 */
 	spin_lock(&gmap->guest_table_lock);
-	list_add(&page->lru, &gmap->crst_list);
+	list_add(&ptdesc->pt_list, &gmap->crst_list);
 	spin_unlock(&gmap->guest_table_lock);
 
 	/* Set new table origin while preserving existing ASCE control bits */
-- 
2.39.2

