[v1 1/5] s390/mm: gmap: sort out physical vs virtual pointers usage

Nico Boehr
2022-10-20T14:32:14Z

Reviewed-by: Pierre Morel <pmorel@linux.ibm.com>
Reviewed-by: Claudio Imbrenda <imbrenda@linux.ibm.com>
---
arch/s390/mm/gmap.c | 147 +++++++++++++++++++++++---------------------
1 file changed, 76 insertions(+), 71 deletions(-)

diff --git a/arch/s390/mm/gmap.c b/arch/s390/mm/gmap.c
index 02d15c8dc92e..2ccfcc8a3863 100644
--- a/arch/s390/mm/gmap.c
+++ b/arch/s390/mm/gmap.c
@@ -72,7 +72,7 @@ static struct gmap *gmap_alloc(unsigned long limit)
goto out_free;
page->index = 0;
list_add(&page->lru, &gmap->crst_list);
- table = (unsigned long *) page_to_phys(page);
+ table = page_to_virt(page);
crst_table_init(table, etype);
gmap->table = table;
gmap->asce = atype | _ASCE_TABLE_LENGTH |
@@ -311,12 +311,12 @@ static int gmap_alloc_table(struct gmap *gmap, unsigned long *table,
page = alloc_pages(GFP_KERNEL_ACCOUNT, CRST_ALLOC_ORDER);
if (!page)
return -ENOMEM;
- new = (unsigned long *) page_to_phys(page);
+ new = page_to_virt(page);
crst_table_init(new, init);
spin_lock(&gmap->guest_table_lock);
if (*table & _REGION_ENTRY_INVALID) {
list_add(&page->lru, &gmap->crst_list);
- *table = (unsigned long) new | _REGION_ENTRY_LENGTH |
+ *table = __pa(new) | _REGION_ENTRY_LENGTH |
(*table & _REGION_ENTRY_TYPE_MASK);
page->index = gaddr;
page = NULL;
@@ -557,7 +557,7 @@ int __gmap_link(struct gmap *gmap, unsigned long gaddr, unsigned long vmaddr)
gmap_alloc_table(gmap, table, _REGION2_ENTRY_EMPTY,
gaddr & _REGION1_MASK))
return -ENOMEM;
- table = (unsigned long *)(*table & _REGION_ENTRY_ORIGIN);
+ table = __va(*table & _REGION_ENTRY_ORIGIN);
}
if ((gmap->asce & _ASCE_TYPE_MASK) >= _ASCE_TYPE_REGION2) {
table += (gaddr & _REGION2_INDEX) >> _REGION2_SHIFT;
@@ -565,7 +565,7 @@ int __gmap_link(struct gmap *gmap, unsigned long gaddr, unsigned long vmaddr)
gmap_alloc_table(gmap, table, _REGION3_ENTRY_EMPTY,
gaddr & _REGION2_MASK))
return -ENOMEM;
- table = (unsigned long *)(*table & _REGION_ENTRY_ORIGIN);
+ table = __va(*table & _REGION_ENTRY_ORIGIN);
}
if ((gmap->asce & _ASCE_TYPE_MASK) >= _ASCE_TYPE_REGION3) {
table += (gaddr & _REGION3_INDEX) >> _REGION3_SHIFT;
@@ -573,7 +573,7 @@ int __gmap_link(struct gmap *gmap, unsigned long gaddr, unsigned long vmaddr)
gmap_alloc_table(gmap, table, _SEGMENT_ENTRY_EMPTY,
gaddr & _REGION3_MASK))
return -ENOMEM;
- table = (unsigned long *)(*table & _REGION_ENTRY_ORIGIN);
+ table = __va(*table & _REGION_ENTRY_ORIGIN);
}
table += (gaddr & _SEGMENT_INDEX) >> _SEGMENT_SHIFT;
/* Walk the parent mm page table */
@@ -813,7 +813,7 @@ static inline unsigned long *gmap_table_walk(struct gmap *gmap,
break;
if (*table & _REGION_ENTRY_INVALID)
return NULL;
- table = (unsigned long *)(*table & _REGION_ENTRY_ORIGIN);
+ table = __va(*table & _REGION_ENTRY_ORIGIN);
fallthrough;
case _ASCE_TYPE_REGION2:
table += (gaddr & _REGION2_INDEX) >> _REGION2_SHIFT;
@@ -821,7 +821,7 @@ static inline unsigned long *gmap_table_walk(struct gmap *gmap,
break;
if (*table & _REGION_ENTRY_INVALID)
return NULL;
- table = (unsigned long *)(*table & _REGION_ENTRY_ORIGIN);
+ table = __va(*table & _REGION_ENTRY_ORIGIN);
fallthrough;
case _ASCE_TYPE_REGION3:
table += (gaddr & _REGION3_INDEX) >> _REGION3_SHIFT;
@@ -829,7 +829,7 @@ static inline unsigned long *gmap_table_walk(struct gmap *gmap,
break;
if (*table & _REGION_ENTRY_INVALID)
return NULL;
- table = (unsigned long *)(*table & _REGION_ENTRY_ORIGIN);
+ table = __va(*table & _REGION_ENTRY_ORIGIN);
fallthrough;
case _ASCE_TYPE_SEGMENT:
table += (gaddr & _SEGMENT_INDEX) >> _SEGMENT_SHIFT;
@@ -837,7 +837,7 @@ static inline unsigned long *gmap_table_walk(struct gmap *gmap,
break;
if (*table & _REGION_ENTRY_INVALID)
return NULL;
- table = (unsigned long *)(*table & _SEGMENT_ENTRY_ORIGIN);
+ table = __va(*table & _SEGMENT_ENTRY_ORIGIN);
table += (gaddr & _PAGE_INDEX) >> _PAGE_SHIFT;
}
return table;
@@ -1150,7 +1150,7 @@ int gmap_read_table(struct gmap *gmap, unsigned long gaddr, unsigned long *val)
if (pte_present(pte) && (pte_val(pte) & _PAGE_READ)) {
address = pte_val(pte) & PAGE_MASK;
address += gaddr & ~PAGE_MASK;
- *val = *(unsigned long *) address;
+ *val = *(unsigned long *)__va(address);
set_pte(ptep, set_pte_bit(*ptep, __pgprot(_PAGE_YOUNG)));
/* Do *NOT* clear the _PAGE_INVALID bit! */
rc = 0;
@@ -1335,7 +1335,8 @@ static void __gmap_unshadow_pgt(struct gmap *sg, unsigned long raddr,
*/
static void gmap_unshadow_pgt(struct gmap *sg, unsigned long raddr)
{
- unsigned long sto, *ste, *pgt;
+ unsigned long *ste;
+ phys_addr_t sto, pgt;
struct page *page;

BUG_ON(!gmap_is_shadow(sg));
@@ -1343,13 +1344,13 @@ static void gmap_unshadow_pgt(struct gmap *sg, unsigned long raddr)
if (!ste || !(*ste & _SEGMENT_ENTRY_ORIGIN))
return;
gmap_call_notifier(sg, raddr, raddr + _SEGMENT_SIZE - 1);
- sto = (unsigned long) (ste - ((raddr & _SEGMENT_INDEX) >> _SEGMENT_SHIFT));
+ sto = __pa(ste - ((raddr & _SEGMENT_INDEX) >> _SEGMENT_SHIFT));
gmap_idte_one(sto | _ASCE_TYPE_SEGMENT, raddr);
- pgt = (unsigned long *)(*ste & _SEGMENT_ENTRY_ORIGIN);
+ pgt = *ste & _SEGMENT_ENTRY_ORIGIN;
*ste = _SEGMENT_ENTRY_EMPTY;
- __gmap_unshadow_pgt(sg, raddr, pgt);
+ __gmap_unshadow_pgt(sg, raddr, __va(pgt));
/* Free page table */
- page = pfn_to_page(__pa(pgt) >> PAGE_SHIFT);
+ page = phys_to_page(pgt);
list_del(&page->lru);
page_table_free_pgste(page);
}
@@ -1365,19 +1366,19 @@ 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)
{
- unsigned long *pgt;
struct page *page;
+ phys_addr_t pgt;
int i;

BUG_ON(!gmap_is_shadow(sg));
for (i = 0; i < _CRST_ENTRIES; i++, raddr += _SEGMENT_SIZE) {
if (!(sgt[i] & _SEGMENT_ENTRY_ORIGIN))
continue;
- pgt = (unsigned long *)(sgt[i] & _REGION_ENTRY_ORIGIN);
+ pgt = sgt[i] & _REGION_ENTRY_ORIGIN;
sgt[i] = _SEGMENT_ENTRY_EMPTY;
- __gmap_unshadow_pgt(sg, raddr, pgt);
+ __gmap_unshadow_pgt(sg, raddr, __va(pgt));
/* Free page table */
- page = pfn_to_page(__pa(pgt) >> PAGE_SHIFT);
+ page = phys_to_page(pgt);
list_del(&page->lru);
page_table_free_pgste(page);
}
@@ -1392,7 +1393,8 @@ static void __gmap_unshadow_sgt(struct gmap *sg, unsigned long raddr,
*/
static void gmap_unshadow_sgt(struct gmap *sg, unsigned long raddr)
{
- unsigned long r3o, *r3e, *sgt;
+ unsigned long r3o, *r3e;
+ phys_addr_t sgt;
struct page *page;

BUG_ON(!gmap_is_shadow(sg));
@@ -1401,12 +1403,12 @@ static void gmap_unshadow_sgt(struct gmap *sg, unsigned long raddr)
return;
gmap_call_notifier(sg, raddr, raddr + _REGION3_SIZE - 1);
r3o = (unsigned long) (r3e - ((raddr & _REGION3_INDEX) >> _REGION3_SHIFT));
- gmap_idte_one(r3o | _ASCE_TYPE_REGION3, raddr);
- sgt = (unsigned long *)(*r3e & _REGION_ENTRY_ORIGIN);
+ gmap_idte_one(__pa(r3o) | _ASCE_TYPE_REGION3, raddr);
+ sgt = *r3e & _REGION_ENTRY_ORIGIN;
*r3e = _REGION3_ENTRY_EMPTY;
- __gmap_unshadow_sgt(sg, raddr, sgt);
+ __gmap_unshadow_sgt(sg, raddr, __va(sgt));
/* Free segment table */
- page = pfn_to_page(__pa(sgt) >> PAGE_SHIFT);
+ page = phys_to_page(sgt);
list_del(&page->lru);
__free_pages(page, CRST_ALLOC_ORDER);
}
@@ -1422,19 +1424,19 @@ 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)
{
- unsigned long *sgt;
struct page *page;
+ phys_addr_t sgt;
int i;

BUG_ON(!gmap_is_shadow(sg));
for (i = 0; i < _CRST_ENTRIES; i++, raddr += _REGION3_SIZE) {
if (!(r3t[i] & _REGION_ENTRY_ORIGIN))
continue;
- sgt = (unsigned long *)(r3t[i] & _REGION_ENTRY_ORIGIN);
+ sgt = r3t[i] & _REGION_ENTRY_ORIGIN;
r3t[i] = _REGION3_ENTRY_EMPTY;
- __gmap_unshadow_sgt(sg, raddr, sgt);
+ __gmap_unshadow_sgt(sg, raddr, __va(sgt));
/* Free segment table */
- page = pfn_to_page(__pa(sgt) >> PAGE_SHIFT);
+ page = phys_to_page(sgt);
list_del(&page->lru);
__free_pages(page, CRST_ALLOC_ORDER);
}
@@ -1449,7 +1451,8 @@ static void __gmap_unshadow_r3t(struct gmap *sg, unsigned long raddr,
*/
static void gmap_unshadow_r3t(struct gmap *sg, unsigned long raddr)
{
- unsigned long r2o, *r2e, *r3t;
+ unsigned long r2o, *r2e;
+ phys_addr_t r3t;
struct page *page;

BUG_ON(!gmap_is_shadow(sg));
@@ -1458,12 +1461,12 @@ static void gmap_unshadow_r3t(struct gmap *sg, unsigned long raddr)
return;
gmap_call_notifier(sg, raddr, raddr + _REGION2_SIZE - 1);
r2o = (unsigned long) (r2e - ((raddr & _REGION2_INDEX) >> _REGION2_SHIFT));
- gmap_idte_one(r2o | _ASCE_TYPE_REGION2, raddr);
- r3t = (unsigned long *)(*r2e & _REGION_ENTRY_ORIGIN);
+ gmap_idte_one(__pa(r2o) | _ASCE_TYPE_REGION2, raddr);
+ r3t = *r2e & _REGION_ENTRY_ORIGIN;
*r2e = _REGION2_ENTRY_EMPTY;
- __gmap_unshadow_r3t(sg, raddr, r3t);
+ __gmap_unshadow_r3t(sg, raddr, __va(r3t));
/* Free region 3 table */
- page = pfn_to_page(__pa(r3t) >> PAGE_SHIFT);
+ page = phys_to_page(r3t);
list_del(&page->lru);
__free_pages(page, CRST_ALLOC_ORDER);
}
@@ -1479,7 +1482,7 @@ static void gmap_unshadow_r3t(struct gmap *sg, unsigned long raddr)
static void __gmap_unshadow_r2t(struct gmap *sg, unsigned long raddr,
unsigned long *r2t)
{
- unsigned long *r3t;
+ phys_addr_t r3t;
struct page *page;
int i;

@@ -1487,11 +1490,11 @@ static void __gmap_unshadow_r2t(struct gmap *sg, unsigned long raddr,
for (i = 0; i < _CRST_ENTRIES; i++, raddr += _REGION2_SIZE) {
if (!(r2t[i] & _REGION_ENTRY_ORIGIN))
continue;
- r3t = (unsigned long *)(r2t[i] & _REGION_ENTRY_ORIGIN);
+ r3t = r2t[i] & _REGION_ENTRY_ORIGIN;
r2t[i] = _REGION2_ENTRY_EMPTY;
- __gmap_unshadow_r3t(sg, raddr, r3t);
+ __gmap_unshadow_r3t(sg, raddr, __va(r3t));
/* Free region 3 table */
- page = pfn_to_page(__pa(r3t) >> PAGE_SHIFT);
+ page = phys_to_page(r3t);
list_del(&page->lru);
__free_pages(page, CRST_ALLOC_ORDER);
}
@@ -1506,8 +1509,9 @@ static void __gmap_unshadow_r2t(struct gmap *sg, unsigned long raddr,
*/
static void gmap_unshadow_r2t(struct gmap *sg, unsigned long raddr)
{
- unsigned long r1o, *r1e, *r2t;
+ unsigned long r1o, *r1e;
struct page *page;
+ phys_addr_t r2t;

BUG_ON(!gmap_is_shadow(sg));
r1e = gmap_table_walk(sg, raddr, 4); /* get region-1 pointer */
@@ -1515,12 +1519,12 @@ static void gmap_unshadow_r2t(struct gmap *sg, unsigned long raddr)
return;
gmap_call_notifier(sg, raddr, raddr + _REGION1_SIZE - 1);
r1o = (unsigned long) (r1e - ((raddr & _REGION1_INDEX) >> _REGION1_SHIFT));
- gmap_idte_one(r1o | _ASCE_TYPE_REGION1, raddr);
- r2t = (unsigned long *)(*r1e & _REGION_ENTRY_ORIGIN);
+ gmap_idte_one(__pa(r1o) | _ASCE_TYPE_REGION1, raddr);
+ r2t = *r1e & _REGION_ENTRY_ORIGIN;
*r1e = _REGION1_ENTRY_EMPTY;
- __gmap_unshadow_r2t(sg, raddr, r2t);
+ __gmap_unshadow_r2t(sg, raddr, __va(r2t));
/* Free region 2 table */
- page = pfn_to_page(__pa(r2t) >> PAGE_SHIFT);
+ page = phys_to_page(r2t);
list_del(&page->lru);
__free_pages(page, CRST_ALLOC_ORDER);
}
@@ -1536,22 +1540,23 @@ static void gmap_unshadow_r2t(struct gmap *sg, unsigned long raddr)
static void __gmap_unshadow_r1t(struct gmap *sg, unsigned long raddr,
unsigned long *r1t)
{
- unsigned long asce, *r2t;
+ unsigned long asce;
struct page *page;
+ phys_addr_t r2t;
int i;

BUG_ON(!gmap_is_shadow(sg));
- asce = (unsigned long) r1t | _ASCE_TYPE_REGION1;
+ asce = __pa(r1t) | _ASCE_TYPE_REGION1;
for (i = 0; i < _CRST_ENTRIES; i++, raddr += _REGION1_SIZE) {
if (!(r1t[i] & _REGION_ENTRY_ORIGIN))
continue;
- r2t = (unsigned long *)(r1t[i] & _REGION_ENTRY_ORIGIN);
- __gmap_unshadow_r2t(sg, raddr, r2t);
+ r2t = r1t[i] & _REGION_ENTRY_ORIGIN;
+ __gmap_unshadow_r2t(sg, raddr, __va(r2t));
/* Clear entry and flush translation r1t -> r2t */
gmap_idte_one(asce, raddr);
r1t[i] = _REGION1_ENTRY_EMPTY;
/* Free region 2 table */
- page = pfn_to_page(__pa(r2t) >> PAGE_SHIFT);
+ page = phys_to_page(r2t);
list_del(&page->lru);
__free_pages(page, CRST_ALLOC_ORDER);
}
@@ -1573,7 +1578,7 @@ static void gmap_unshadow(struct gmap *sg)
sg->removed = 1;
gmap_call_notifier(sg, 0, -1UL);
gmap_flush_tlb(sg);
- table = (unsigned long *)(sg->asce & _ASCE_ORIGIN);
+ table = __va(sg->asce & _ASCE_ORIGIN);
switch (sg->asce & _ASCE_TYPE_MASK) {
case _ASCE_TYPE_REGION1:
__gmap_unshadow_r1t(sg, 0, table);
@@ -1748,7 +1753,8 @@ int gmap_shadow_r2t(struct gmap *sg, unsigned long saddr, unsigned long r2t,
int fake)
{
unsigned long raddr, origin, offset, len;
- unsigned long *s_r2t, *table;
+ unsigned long *table;
+ phys_addr_t s_r2t;
struct page *page;
int rc;

@@ -1760,7 +1766,7 @@ int gmap_shadow_r2t(struct gmap *sg, unsigned long saddr, unsigned long r2t,
page->index = r2t & _REGION_ENTRY_ORIGIN;
if (fake)
page->index |= GMAP_SHADOW_FAKE_TABLE;
- s_r2t = (unsigned long *) page_to_phys(page);
+ s_r2t = page_to_phys(page);
/* Install shadow region second table */
spin_lock(&sg->guest_table_lock);
table = gmap_table_walk(sg, saddr, 4); /* get region-1 pointer */
@@ -1775,9 +1781,9 @@ int gmap_shadow_r2t(struct gmap *sg, unsigned long saddr, unsigned long r2t,
rc = -EAGAIN; /* Race with shadow */
goto out_free;
}
- crst_table_init(s_r2t, _REGION2_ENTRY_EMPTY);
+ crst_table_init(__va(s_r2t), _REGION2_ENTRY_EMPTY);
/* mark as invalid as long as the parent table is not protected */
- *table = (unsigned long) s_r2t | _REGION_ENTRY_LENGTH |
+ *table = s_r2t | _REGION_ENTRY_LENGTH |
_REGION_ENTRY_TYPE_R1 | _REGION_ENTRY_INVALID;
if (sg->edat_level >= 1)
*table |= (r2t & _REGION_ENTRY_PROTECT);
@@ -1798,8 +1804,7 @@ int gmap_shadow_r2t(struct gmap *sg, unsigned long saddr, unsigned long r2t,
spin_lock(&sg->guest_table_lock);
if (!rc) {
table = gmap_table_walk(sg, saddr, 4);
- if (!table || (*table & _REGION_ENTRY_ORIGIN) !=
- (unsigned long) s_r2t)
+ if (!table || (*table & _REGION_ENTRY_ORIGIN) != s_r2t)
rc = -EAGAIN; /* Race with unshadow */
else
*table &= ~_REGION_ENTRY_INVALID;
@@ -1832,7 +1837,8 @@ int gmap_shadow_r3t(struct gmap *sg, unsigned long saddr, unsigned long r3t,
int fake)
{
unsigned long raddr, origin, offset, len;
- unsigned long *s_r3t, *table;
+ unsigned long *table;
+ phys_addr_t s_r3t;
struct page *page;
int rc;

@@ -1844,7 +1850,7 @@ int gmap_shadow_r3t(struct gmap *sg, unsigned long saddr, unsigned long r3t,
page->index = r3t & _REGION_ENTRY_ORIGIN;
if (fake)
page->index |= GMAP_SHADOW_FAKE_TABLE;
- s_r3t = (unsigned long *) page_to_phys(page);
+ s_r3t = page_to_phys(page);
/* Install shadow region second table */
spin_lock(&sg->guest_table_lock);
table = gmap_table_walk(sg, saddr, 3); /* get region-2 pointer */
@@ -1859,9 +1865,9 @@ int gmap_shadow_r3t(struct gmap *sg, unsigned long saddr, unsigned long r3t,
rc = -EAGAIN; /* Race with shadow */
goto out_free;
}
- crst_table_init(s_r3t, _REGION3_ENTRY_EMPTY);
+ crst_table_init(__va(s_r3t), _REGION3_ENTRY_EMPTY);
/* mark as invalid as long as the parent table is not protected */
- *table = (unsigned long) s_r3t | _REGION_ENTRY_LENGTH |
+ *table = s_r3t | _REGION_ENTRY_LENGTH |
_REGION_ENTRY_TYPE_R2 | _REGION_ENTRY_INVALID;
if (sg->edat_level >= 1)
*table |= (r3t & _REGION_ENTRY_PROTECT);
@@ -1882,8 +1888,7 @@ int gmap_shadow_r3t(struct gmap *sg, unsigned long saddr, unsigned long r3t,
spin_lock(&sg->guest_table_lock);
if (!rc) {
table = gmap_table_walk(sg, saddr, 3);
- if (!table || (*table & _REGION_ENTRY_ORIGIN) !=
- (unsigned long) s_r3t)
+ if (!table || (*table & _REGION_ENTRY_ORIGIN) != s_r3t)
rc = -EAGAIN; /* Race with unshadow */
else
*table &= ~_REGION_ENTRY_INVALID;
@@ -1916,7 +1921,8 @@ int gmap_shadow_sgt(struct gmap *sg, unsigned long saddr, unsigned long sgt,
int fake)
{
unsigned long raddr, origin, offset, len;
- unsigned long *s_sgt, *table;
+ unsigned long *table;
+ phys_addr_t s_sgt;
struct page *page;
int rc;

@@ -1928,7 +1934,7 @@ int gmap_shadow_sgt(struct gmap *sg, unsigned long saddr, unsigned long sgt,
page->index = sgt & _REGION_ENTRY_ORIGIN;
if (fake)
page->index |= GMAP_SHADOW_FAKE_TABLE;
- s_sgt = (unsigned long *) page_to_phys(page);
+ s_sgt = page_to_phys(page);
/* Install shadow region second table */
spin_lock(&sg->guest_table_lock);
table = gmap_table_walk(sg, saddr, 2); /* get region-3 pointer */
@@ -1943,9 +1949,9 @@ int gmap_shadow_sgt(struct gmap *sg, unsigned long saddr, unsigned long sgt,
rc = -EAGAIN; /* Race with shadow */
goto out_free;
}
- crst_table_init(s_sgt, _SEGMENT_ENTRY_EMPTY);
+ crst_table_init(__va(s_sgt), _SEGMENT_ENTRY_EMPTY);
/* mark as invalid as long as the parent table is not protected */
- *table = (unsigned long) s_sgt | _REGION_ENTRY_LENGTH |
+ *table = s_sgt | _REGION_ENTRY_LENGTH |
_REGION_ENTRY_TYPE_R3 | _REGION_ENTRY_INVALID;
if (sg->edat_level >= 1)
*table |= sgt & _REGION_ENTRY_PROTECT;
@@ -1966,8 +1972,7 @@ int gmap_shadow_sgt(struct gmap *sg, unsigned long saddr, unsigned long sgt,
spin_lock(&sg->guest_table_lock);
if (!rc) {
table = gmap_table_walk(sg, saddr, 2);
- if (!table || (*table & _REGION_ENTRY_ORIGIN) !=
- (unsigned long) s_sgt)
+ if (!table || (*table & _REGION_ENTRY_ORIGIN) != s_sgt)
rc = -EAGAIN; /* Race with unshadow */
else
*table &= ~_REGION_ENTRY_INVALID;
@@ -2040,8 +2045,9 @@ int gmap_shadow_pgt(struct gmap *sg, unsigned long saddr, unsigned long pgt,
int fake)
{
unsigned long raddr, origin;
- unsigned long *s_pgt, *table;
+ unsigned long *table;
struct page *page;
+ phys_addr_t s_pgt;
int rc;

BUG_ON(!gmap_is_shadow(sg) || (pgt & _SEGMENT_ENTRY_LARGE));
@@ -2052,7 +2058,7 @@ int gmap_shadow_pgt(struct gmap *sg, unsigned long saddr, unsigned long pgt,
page->index = pgt & _SEGMENT_ENTRY_ORIGIN;
if (fake)
page->index |= GMAP_SHADOW_FAKE_TABLE;
- s_pgt = (unsigned long *) page_to_phys(page);
+ s_pgt = page_to_phys(page);
/* Install shadow page table */
spin_lock(&sg->guest_table_lock);
table = gmap_table_walk(sg, saddr, 1); /* get segment pointer */
@@ -2085,8 +2091,7 @@ int gmap_shadow_pgt(struct gmap *sg, unsigned long saddr, unsigned long pgt,
spin_lock(&sg->guest_table_lock);
if (!rc) {
table = gmap_table_walk(sg, saddr, 1);
- if (!table || (*table & _SEGMENT_ENTRY_ORIGIN) !=
- (unsigned long) s_pgt)
+ if (!table || (*table & _SEGMENT_ENTRY_ORIGIN) != s_pgt)
rc = -EAGAIN; /* Race with unshadow */
else
*table &= ~_SEGMENT_ENTRY_INVALID;
--
2.37.3