Commit f2a6a705 authored by Kirill A. Shutemov's avatar Kirill A. Shutemov Committed by Ingo Molnar

x86: Convert the rest of the code to support p4d_t

This patch converts x86 to use proper folding of a new (fifth) page table level
with <asm-generic/pgtable-nop4d.h>.

That's a bit of a kitchen sink patch, but I don't see how to split it further
without hurting bisectability.
Signed-off-by: default avatarKirill A. Shutemov <kirill.shutemov@linux.intel.com>
Acked-by: default avatarThomas Gleixner <tglx@linutronix.de>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Brian Gerst <brgerst@gmail.com>
Cc: Dave Hansen <dave.hansen@intel.com>
Cc: Denys Vlasenko <dvlasenk@redhat.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Josh Poimboeuf <jpoimboe@redhat.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Michal Hocko <mhocko@suse.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: linux-arch@vger.kernel.org
Cc: linux-mm@kvack.org
Link: http://lkml.kernel.org/r/20170317185515.8636-7-kirill.shutemov@linux.intel.comSigned-off-by: default avatarIngo Molnar <mingo@kernel.org>
parent 907cd439
......@@ -536,7 +536,7 @@ static inline void set_pud(pud_t *pudp, pud_t pud)
PVOP_VCALL2(pv_mmu_ops.set_pud, pudp,
val);
}
#if CONFIG_PGTABLE_LEVELS == 4
#if CONFIG_PGTABLE_LEVELS >= 4
static inline pud_t __pud(pudval_t val)
{
pudval_t ret;
......@@ -565,6 +565,32 @@ static inline pudval_t pud_val(pud_t pud)
return ret;
}
static inline void pud_clear(pud_t *pudp)
{
set_pud(pudp, __pud(0));
}
static inline void set_p4d(p4d_t *p4dp, p4d_t p4d)
{
p4dval_t val = native_p4d_val(p4d);
if (sizeof(p4dval_t) > sizeof(long))
PVOP_VCALL3(pv_mmu_ops.set_p4d, p4dp,
val, (u64)val >> 32);
else
PVOP_VCALL2(pv_mmu_ops.set_p4d, p4dp,
val);
}
static inline void p4d_clear(p4d_t *p4dp)
{
set_p4d(p4dp, __p4d(0));
}
#if CONFIG_PGTABLE_LEVELS >= 5
#error FIXME
static inline void set_pgd(pgd_t *pgdp, pgd_t pgd)
{
pgdval_t val = native_pgd_val(pgd);
......@@ -582,10 +608,7 @@ static inline void pgd_clear(pgd_t *pgdp)
set_pgd(pgdp, __pgd(0));
}
static inline void pud_clear(pud_t *pudp)
{
set_pud(pudp, __pud(0));
}
#endif /* CONFIG_PGTABLE_LEVELS == 5 */
#endif /* CONFIG_PGTABLE_LEVELS == 4 */
......
......@@ -279,12 +279,18 @@ struct pv_mmu_ops {
struct paravirt_callee_save pmd_val;
struct paravirt_callee_save make_pmd;
#if CONFIG_PGTABLE_LEVELS == 4
#if CONFIG_PGTABLE_LEVELS >= 4
struct paravirt_callee_save pud_val;
struct paravirt_callee_save make_pud;
void (*set_pgd)(pgd_t *pudp, pgd_t pgdval);
#endif /* CONFIG_PGTABLE_LEVELS == 4 */
void (*set_p4d)(p4d_t *p4dp, p4d_t p4dval);
#if CONFIG_PGTABLE_LEVELS >= 5
#error FIXME
#endif /* CONFIG_PGTABLE_LEVELS >= 5 */
#endif /* CONFIG_PGTABLE_LEVELS >= 4 */
#endif /* CONFIG_PGTABLE_LEVELS >= 3 */
struct pv_lazy_ops lazy_mode;
......
......@@ -121,10 +121,10 @@ static inline void pud_populate(struct mm_struct *mm, pud_t *pud, pmd_t *pmd)
#endif /* CONFIG_X86_PAE */
#if CONFIG_PGTABLE_LEVELS > 3
static inline void pgd_populate(struct mm_struct *mm, pgd_t *pgd, pud_t *pud)
static inline void p4d_populate(struct mm_struct *mm, p4d_t *p4d, pud_t *pud)
{
paravirt_alloc_pud(mm, __pa(pud) >> PAGE_SHIFT);
set_pgd(pgd, __pgd(_PAGE_TABLE | __pa(pud)));
set_p4d(p4d, __p4d(_PAGE_TABLE | __pa(pud)));
}
static inline pud_t *pud_alloc_one(struct mm_struct *mm, unsigned long addr)
......@@ -150,6 +150,37 @@ static inline void __pud_free_tlb(struct mmu_gather *tlb, pud_t *pud,
___pud_free_tlb(tlb, pud);
}
#if CONFIG_PGTABLE_LEVELS > 4
static inline void pgd_populate(struct mm_struct *mm, pgd_t *pgd, p4d_t *p4d)
{
paravirt_alloc_p4d(mm, __pa(p4d) >> PAGE_SHIFT);
set_pgd(pgd, __pgd(_PAGE_TABLE | __pa(p4d)));
}
static inline p4d_t *p4d_alloc_one(struct mm_struct *mm, unsigned long addr)
{
gfp_t gfp = GFP_KERNEL_ACCOUNT;
if (mm == &init_mm)
gfp &= ~__GFP_ACCOUNT;
return (p4d_t *)get_zeroed_page(gfp);
}
static inline void p4d_free(struct mm_struct *mm, p4d_t *p4d)
{
BUG_ON((unsigned long)p4d & (PAGE_SIZE-1));
free_page((unsigned long)p4d);
}
extern void ___p4d_free_tlb(struct mmu_gather *tlb, p4d_t *p4d);
static inline void __p4d_free_tlb(struct mmu_gather *tlb, p4d_t *p4d,
unsigned long address)
{
___p4d_free_tlb(tlb, p4d);
}
#endif /* CONFIG_PGTABLE_LEVELS > 4 */
#endif /* CONFIG_PGTABLE_LEVELS > 3 */
#endif /* CONFIG_PGTABLE_LEVELS > 2 */
......
......@@ -53,11 +53,19 @@ extern struct mm_struct *pgd_page_get_mm(struct page *page);
#define set_pmd(pmdp, pmd) native_set_pmd(pmdp, pmd)
#ifndef __PAGETABLE_PUD_FOLDED
#ifndef __PAGETABLE_P4D_FOLDED
#define set_pgd(pgdp, pgd) native_set_pgd(pgdp, pgd)
#define pgd_clear(pgd) native_pgd_clear(pgd)
#endif
#ifndef set_p4d
# define set_p4d(p4dp, p4d) native_set_p4d(p4dp, p4d)
#endif
#ifndef __PAGETABLE_PUD_FOLDED
#define p4d_clear(p4d) native_p4d_clear(p4d)
#endif
#ifndef set_pud
# define set_pud(pudp, pud) native_set_pud(pudp, pud)
#endif
......@@ -74,6 +82,11 @@ extern struct mm_struct *pgd_page_get_mm(struct page *page);
#define pgd_val(x) native_pgd_val(x)
#define __pgd(x) native_make_pgd(x)
#ifndef __PAGETABLE_P4D_FOLDED
#define p4d_val(x) native_p4d_val(x)
#define __p4d(x) native_make_p4d(x)
#endif
#ifndef __PAGETABLE_PUD_FOLDED
#define pud_val(x) native_pud_val(x)
#define __pud(x) native_make_pud(x)
......@@ -554,6 +567,7 @@ static inline pgprot_t pgprot_modify(pgprot_t oldprot, pgprot_t newprot)
#define pte_pgprot(x) __pgprot(pte_flags(x))
#define pmd_pgprot(x) __pgprot(pmd_flags(x))
#define pud_pgprot(x) __pgprot(pud_flags(x))
#define p4d_pgprot(x) __pgprot(p4d_flags(x))
#define canon_pgprot(p) __pgprot(massage_pgprot(p))
......@@ -792,12 +806,47 @@ static inline unsigned long pud_index(unsigned long address)
return (address >> PUD_SHIFT) & (PTRS_PER_PUD - 1);
}
#if CONFIG_PGTABLE_LEVELS > 3
static inline int p4d_none(p4d_t p4d)
{
return (native_p4d_val(p4d) & ~(_PAGE_KNL_ERRATUM_MASK)) == 0;
}
static inline int p4d_present(p4d_t p4d)
{
return p4d_flags(p4d) & _PAGE_PRESENT;
}
static inline unsigned long p4d_page_vaddr(p4d_t p4d)
{
return (unsigned long)__va(p4d_val(p4d) & p4d_pfn_mask(p4d));
}
/*
* Currently stuck as a macro due to indirect forward reference to
* linux/mmzone.h's __section_mem_map_addr() definition:
*/
#define p4d_page(p4d) \
pfn_to_page((p4d_val(p4d) & p4d_pfn_mask(p4d)) >> PAGE_SHIFT)
/* Find an entry in the third-level page table.. */
static inline pud_t *pud_offset(p4d_t *p4d, unsigned long address)
{
return (pud_t *)p4d_page_vaddr(*p4d) + pud_index(address);
}
static inline int p4d_bad(p4d_t p4d)
{
return (p4d_flags(p4d) & ~(_KERNPG_TABLE | _PAGE_USER)) != 0;
}
#endif /* CONFIG_PGTABLE_LEVELS > 3 */
static inline unsigned long p4d_index(unsigned long address)
{
return (address >> P4D_SHIFT) & (PTRS_PER_P4D - 1);
}
#if CONFIG_PGTABLE_LEVELS > 3
#if CONFIG_PGTABLE_LEVELS > 4
static inline int pgd_present(pgd_t pgd)
{
return pgd_flags(pgd) & _PAGE_PRESENT;
......@@ -815,9 +864,9 @@ static inline unsigned long pgd_page_vaddr(pgd_t pgd)
#define pgd_page(pgd) pfn_to_page(pgd_val(pgd) >> PAGE_SHIFT)
/* to find an entry in a page-table-directory. */
static inline pud_t *pud_offset(pgd_t *pgd, unsigned long address)
static inline p4d_t *p4d_offset(pgd_t *pgd, unsigned long address)
{
return (pud_t *)pgd_page_vaddr(*pgd) + pud_index(address);
return (p4d_t *)pgd_page_vaddr(*pgd) + p4d_index(address);
}
static inline int pgd_bad(pgd_t pgd)
......@@ -835,7 +884,7 @@ static inline int pgd_none(pgd_t pgd)
*/
return !native_pgd_val(pgd);
}
#endif /* CONFIG_PGTABLE_LEVELS > 3 */
#endif /* CONFIG_PGTABLE_LEVELS > 4 */
#endif /* __ASSEMBLY__ */
......
......@@ -41,9 +41,9 @@ extern void paging_init(void);
struct mm_struct;
void set_pte_vaddr_p4d(p4d_t *p4d_page, unsigned long vaddr, pte_t new_pte);
void set_pte_vaddr_pud(pud_t *pud_page, unsigned long vaddr, pte_t new_pte);
static inline void native_pte_clear(struct mm_struct *mm, unsigned long addr,
pte_t *ptep)
{
......@@ -121,6 +121,16 @@ static inline pud_t native_pudp_get_and_clear(pud_t *xp)
#endif
}
static inline void native_set_p4d(p4d_t *p4dp, p4d_t p4d)
{
*p4dp = p4d;
}
static inline void native_p4d_clear(p4d_t *p4d)
{
native_set_p4d(p4d, (p4d_t) { .pgd = native_make_pgd(0)});
}
static inline void native_set_pgd(pgd_t *pgdp, pgd_t pgd)
{
*pgdp = pgd;
......
......@@ -277,11 +277,11 @@ static inline pgdval_t pgd_flags(pgd_t pgd)
#error FIXME
#else
#include <asm-generic/5level-fixup.h>
#include <asm-generic/pgtable-nop4d.h>
static inline p4dval_t native_p4d_val(p4d_t p4d)
{
return native_pgd_val(p4d);
return native_pgd_val(p4d.pgd);
}
#endif
......@@ -298,12 +298,11 @@ static inline pudval_t native_pud_val(pud_t pud)
return pud.pud;
}
#else
#define __ARCH_USE_5LEVEL_HACK
#include <asm-generic/pgtable-nopud.h>
static inline pudval_t native_pud_val(pud_t pud)
{
return native_pgd_val(pud.pgd);
return native_pgd_val(pud.p4d.pgd);
}
#endif
......@@ -320,12 +319,11 @@ static inline pmdval_t native_pmd_val(pmd_t pmd)
return pmd.pmd;
}
#else
#define __ARCH_USE_5LEVEL_HACK
#include <asm-generic/pgtable-nopmd.h>
static inline pmdval_t native_pmd_val(pmd_t pmd)
{
return native_pgd_val(pmd.pud.pgd);
return native_pgd_val(pmd.pud.p4d.pgd);
}
#endif
......
......@@ -279,13 +279,17 @@ static inline pte_t __pte_ma(pteval_t x)
#define pmd_val_ma(v) ((v).pmd)
#ifdef __PAGETABLE_PUD_FOLDED
#define pud_val_ma(v) ((v).pgd.pgd)
#define pud_val_ma(v) ((v).p4d.pgd.pgd)
#else
#define pud_val_ma(v) ((v).pud)
#endif
#define __pmd_ma(x) ((pmd_t) { (x) } )
#define pgd_val_ma(x) ((x).pgd)
#ifdef __PAGETABLE_P4D_FOLDED
#define p4d_val_ma(x) ((x).pgd.pgd)
#else
#define p4d_val_ma(x) ((x).p4d)
#endif
void xen_set_domain_pte(pte_t *ptep, pte_t pteval, unsigned domid);
......
......@@ -430,12 +430,16 @@ struct pv_mmu_ops pv_mmu_ops __ro_after_init = {
.pmd_val = PTE_IDENT,
.make_pmd = PTE_IDENT,
#if CONFIG_PGTABLE_LEVELS == 4
#if CONFIG_PGTABLE_LEVELS >= 4
.pud_val = PTE_IDENT,
.make_pud = PTE_IDENT,
.set_pgd = native_set_pgd,
#endif
.set_p4d = native_set_p4d,
#if CONFIG_PGTABLE_LEVELS >= 5
#error FIXME
#endif /* CONFIG_PGTABLE_LEVELS >= 4 */
#endif /* CONFIG_PGTABLE_LEVELS >= 4 */
#endif /* CONFIG_PGTABLE_LEVELS >= 3 */
.pte_val = PTE_IDENT,
......
......@@ -97,28 +97,38 @@ void sync_global_pgds(unsigned long start, unsigned long end)
unsigned long address;
for (address = start; address <= end; address += PGDIR_SIZE) {
const pgd_t *pgd_ref = pgd_offset_k(address);
pgd_t *pgd_ref = pgd_offset_k(address);
const p4d_t *p4d_ref;
struct page *page;
if (pgd_none(*pgd_ref))
/*
* With folded p4d, pgd_none() is always false, we need to
* handle synchonization on p4d level.
*/
BUILD_BUG_ON(pgd_none(*pgd_ref));
p4d_ref = p4d_offset(pgd_ref, address);
if (p4d_none(*p4d_ref))
continue;
spin_lock(&pgd_lock);
list_for_each_entry(page, &pgd_list, lru) {
pgd_t *pgd;
p4d_t *p4d;
spinlock_t *pgt_lock;
pgd = (pgd_t *)page_address(page) + pgd_index(address);
p4d = p4d_offset(pgd, address);
/* the pgt_lock only for Xen */
pgt_lock = &pgd_page_get_mm(page)->page_table_lock;
spin_lock(pgt_lock);
if (!pgd_none(*pgd_ref) && !pgd_none(*pgd))
BUG_ON(pgd_page_vaddr(*pgd)
!= pgd_page_vaddr(*pgd_ref));
if (!p4d_none(*p4d_ref) && !p4d_none(*p4d))
BUG_ON(p4d_page_vaddr(*p4d)
!= p4d_page_vaddr(*p4d_ref));
if (pgd_none(*pgd))
set_pgd(pgd, *pgd_ref);
if (p4d_none(*p4d))
set_p4d(p4d, *p4d_ref);
spin_unlock(pgt_lock);
}
......@@ -149,16 +159,28 @@ static __ref void *spp_getpage(void)
return ptr;
}
static pud_t *fill_pud(pgd_t *pgd, unsigned long vaddr)
static p4d_t *fill_p4d(pgd_t *pgd, unsigned long vaddr)
{
if (pgd_none(*pgd)) {
pud_t *pud = (pud_t *)spp_getpage();
pgd_populate(&init_mm, pgd, pud);
if (pud != pud_offset(pgd, 0))
p4d_t *p4d = (p4d_t *)spp_getpage();
pgd_populate(&init_mm, pgd, p4d);
if (p4d != p4d_offset(pgd, 0))
printk(KERN_ERR "PAGETABLE BUG #00! %p <-> %p\n",
pud, pud_offset(pgd, 0));
p4d, p4d_offset(pgd, 0));
}
return p4d_offset(pgd, vaddr);
}
static pud_t *fill_pud(p4d_t *p4d, unsigned long vaddr)
{
if (p4d_none(*p4d)) {
pud_t *pud = (pud_t *)spp_getpage();
p4d_populate(&init_mm, p4d, pud);
if (pud != pud_offset(p4d, 0))
printk(KERN_ERR "PAGETABLE BUG #01! %p <-> %p\n",
pud, pud_offset(p4d, 0));
}
return pud_offset(pgd, vaddr);
return pud_offset(p4d, vaddr);
}
static pmd_t *fill_pmd(pud_t *pud, unsigned long vaddr)
......@@ -167,7 +189,7 @@ static pmd_t *fill_pmd(pud_t *pud, unsigned long vaddr)
pmd_t *pmd = (pmd_t *) spp_getpage();
pud_populate(&init_mm, pud, pmd);
if (pmd != pmd_offset(pud, 0))
printk(KERN_ERR "PAGETABLE BUG #01! %p <-> %p\n",
printk(KERN_ERR "PAGETABLE BUG #02! %p <-> %p\n",
pmd, pmd_offset(pud, 0));
}
return pmd_offset(pud, vaddr);
......@@ -179,20 +201,15 @@ static pte_t *fill_pte(pmd_t *pmd, unsigned long vaddr)
pte_t *pte = (pte_t *) spp_getpage();
pmd_populate_kernel(&init_mm, pmd, pte);
if (pte != pte_offset_kernel(pmd, 0))
printk(KERN_ERR "PAGETABLE BUG #02!\n");
printk(KERN_ERR "PAGETABLE BUG #03!\n");
}
return pte_offset_kernel(pmd, vaddr);
}
void set_pte_vaddr_pud(pud_t *pud_page, unsigned long vaddr, pte_t new_pte)
static void __set_pte_vaddr(pud_t *pud, unsigned long vaddr, pte_t new_pte)
{
pud_t *pud;
pmd_t *pmd;
pte_t *pte;
pud = pud_page + pud_index(vaddr);
pmd = fill_pmd(pud, vaddr);
pte = fill_pte(pmd, vaddr);
pmd_t *pmd = fill_pmd(pud, vaddr);
pte_t *pte = fill_pte(pmd, vaddr);
set_pte(pte, new_pte);
......@@ -203,10 +220,25 @@ void set_pte_vaddr_pud(pud_t *pud_page, unsigned long vaddr, pte_t new_pte)
__flush_tlb_one(vaddr);
}
void set_pte_vaddr_p4d(p4d_t *p4d_page, unsigned long vaddr, pte_t new_pte)
{
p4d_t *p4d = p4d_page + p4d_index(vaddr);
pud_t *pud = fill_pud(p4d, vaddr);
__set_pte_vaddr(pud, vaddr, new_pte);
}
void set_pte_vaddr_pud(pud_t *pud_page, unsigned long vaddr, pte_t new_pte)
{
pud_t *pud = pud_page + pud_index(vaddr);
__set_pte_vaddr(pud, vaddr, new_pte);
}
void set_pte_vaddr(unsigned long vaddr, pte_t pteval)
{
pgd_t *pgd;
pud_t *pud_page;
p4d_t *p4d_page;
pr_debug("set_pte_vaddr %lx to %lx\n", vaddr, native_pte_val(pteval));
......@@ -216,17 +248,20 @@ void set_pte_vaddr(unsigned long vaddr, pte_t pteval)
"PGD FIXMAP MISSING, it should be setup in head.S!\n");
return;
}
pud_page = (pud_t*)pgd_page_vaddr(*pgd);
set_pte_vaddr_pud(pud_page, vaddr, pteval);
p4d_page = p4d_offset(pgd, 0);
set_pte_vaddr_p4d(p4d_page, vaddr, pteval);
}
pmd_t * __init populate_extra_pmd(unsigned long vaddr)
{
pgd_t *pgd;
p4d_t *p4d;
pud_t *pud;
pgd = pgd_offset_k(vaddr);
pud = fill_pud(pgd, vaddr);
p4d = fill_p4d(pgd, vaddr);
pud = fill_pud(p4d, vaddr);
return fill_pmd(pud, vaddr);
}
......@@ -245,6 +280,7 @@ static void __init __init_extra_mapping(unsigned long phys, unsigned long size,
enum page_cache_mode cache)
{
pgd_t *pgd;
p4d_t *p4d;
pud_t *pud;
pmd_t *pmd;
pgprot_t prot;
......@@ -255,11 +291,17 @@ static void __init __init_extra_mapping(unsigned long phys, unsigned long size,
for (; size; phys += PMD_SIZE, size -= PMD_SIZE) {
pgd = pgd_offset_k((unsigned long)__va(phys));
if (pgd_none(*pgd)) {
p4d = (p4d_t *) spp_getpage();
set_pgd(pgd, __pgd(__pa(p4d) | _KERNPG_TABLE |
_PAGE_USER));
}
p4d = p4d_offset(pgd, (unsigned long)__va(phys));
if (p4d_none(*p4d)) {
pud = (pud_t *) spp_getpage();
set_pgd(pgd, __pgd(__pa(pud) | _KERNPG_TABLE |
set_p4d(p4d, __p4d(__pa(pud) | _KERNPG_TABLE |
_PAGE_USER));
}
pud = pud_offset(pgd, (unsigned long)__va(phys));
pud = pud_offset(p4d, (unsigned long)__va(phys));
if (pud_none(*pud)) {
pmd = (pmd_t *) spp_getpage();
set_pud(pud, __pud(__pa(pmd) | _KERNPG_TABLE |
......@@ -563,12 +605,15 @@ kernel_physical_mapping_init(unsigned long paddr_start,
for (; vaddr < vaddr_end; vaddr = vaddr_next) {
pgd_t *pgd = pgd_offset_k(vaddr);
p4d_t *p4d;
pud_t *pud;
vaddr_next = (vaddr & PGDIR_MASK) + PGDIR_SIZE;
if (pgd_val(*pgd)) {
pud = (pud_t *)pgd_page_vaddr(*pgd);
BUILD_BUG_ON(pgd_none(*pgd));
p4d = p4d_offset(pgd, vaddr);
if (p4d_val(*p4d)) {
pud = (pud_t *)p4d_page_vaddr(*p4d);
paddr_last = phys_pud_init(pud, __pa(vaddr),
__pa(vaddr_end),
page_size_mask);
......@@ -580,7 +625,7 @@ kernel_physical_mapping_init(unsigned long paddr_start,
page_size_mask);
spin_lock(&init_mm.page_table_lock);
pgd_populate(&init_mm, pgd, pud);
p4d_populate(&init_mm, p4d, pud);
spin_unlock(&init_mm.page_table_lock);
pgd_changed = true;
}
......@@ -726,6 +771,24 @@ static void __meminit free_pmd_table(pmd_t *pmd_start, pud_t *pud)
spin_unlock(&init_mm.page_table_lock);
}
static void __meminit free_pud_table(pud_t *pud_start, p4d_t *p4d)
{
pud_t *pud;
int i;
for (i = 0; i < PTRS_PER_PUD; i++) {
pud = pud_start + i;
if (!pud_none(*pud))
return;
}
/* free a pud talbe */
free_pagetable(p4d_page(*p4d), 0);
spin_lock(&init_mm.page_table_lock);
p4d_clear(p4d);
spin_unlock(&init_mm.page_table_lock);
}
static void __meminit
remove_pte_table(pte_t *pte_start, unsigned long addr, unsigned long end,
bool direct)
......@@ -908,6 +971,32 @@ remove_pud_table(pud_t *pud_start, unsigned long addr, unsigned long end,
update_page_count(PG_LEVEL_1G, -pages);
}
static void __meminit
remove_p4d_table(p4d_t *p4d_start, unsigned long addr, unsigned long end,
bool direct)
{
unsigned long next, pages = 0;
pud_t *pud_base;
p4d_t *p4d;
p4d = p4d_start + p4d_index(addr);
for (; addr < end; addr = next, p4d++) {
next = p4d_addr_end(addr, end);
if (!p4d_present(*p4d))
continue;
BUILD_BUG_ON(p4d_large(*p4d));
pud_base = (pud_t *)p4d_page_vaddr(*p4d);
remove_pud_table(pud_base, addr, next, direct);
free_pud_table(pud_base, p4d);
}
if (direct)
update_page_count(PG_LEVEL_512G, -pages);
}
/* start and end are both virtual address. */
static void __meminit
remove_pagetable(unsigned long start, unsigned long end, bool direct)
......@@ -915,7 +1004,7 @@ remove_pagetable(unsigned long start, unsigned long end, bool direct)
unsigned long next;
unsigned long addr;
pgd_t *pgd;
pud_t *pud;
p4d_t *p4d;
for (addr = start; addr < end; addr = next) {
next = pgd_addr_end(addr, end);
......@@ -924,8 +1013,8 @@ remove_pagetable(unsigned long start, unsigned long end, bool direct)
if (!pgd_present(*pgd))
continue;
pud = (pud_t *)pgd_page_vaddr(*pgd);
remove_pud_table(pud, addr, next, direct);
p4d = (p4d_t *)pgd_page_vaddr(*pgd);
remove_p4d_table(p4d, addr, next, direct);
}
flush_tlb_all();
......@@ -1090,6 +1179,7 @@ int kern_addr_valid(unsigned long addr)
{
unsigned long above = ((long)addr) >> __VIRTUAL_MASK_SHIFT;
pgd_t *pgd;
p4d_t *p4d;
pud_t *pud;
pmd_t *pmd;
pte_t *pte;
......@@ -1101,7 +1191,11 @@ int kern_addr_valid(unsigned long addr)
if (pgd_none(*pgd))
return 0;
pud = pud_offset(pgd, addr);
p4d = p4d_offset(pgd, addr);
if (p4d_none(*p4d))
return 0;
pud = pud_offset(p4d, addr);
if (pud_none(*pud))
return 0;
......@@ -1158,6 +1252,7 @@ static int __meminit vmemmap_populate_hugepages(unsigned long start,
unsigned long addr;
unsigned long next;
pgd_t *pgd;
p4d_t *p4d;
pud_t *pud;
pmd_t *pmd;
......@@ -1168,7 +1263,11 @@ static int __meminit vmemmap_populate_hugepages(unsigned long start,
if (!pgd)
return -ENOMEM;
pud = vmemmap_pud_populate(pgd, addr, node);
p4d = vmemmap_p4d_populate(pgd, addr, node);
if (!p4d)
return -ENOMEM;
pud = vmemmap_pud_populate(p4d, addr, node);
if (!pud)
return -ENOMEM;
......@@ -1236,6 +1335,7 @@ void register_page_bootmem_memmap(unsigned long section_nr,
unsigned long end = (unsigned long)(start_page + size);
unsigned long next;
pgd_t *pgd;
p4d_t *p4d;
pud_t *pud;
pmd_t *pmd;
unsigned int nr_pages;
......@@ -1251,7 +1351,14 @@ void register_page_bootmem_memmap(unsigned long section_nr,
}
get_page_bootmem(section_nr, pgd_page(*pgd), MIX_SECTION_INFO);
pud = pud_offset(pgd, addr);
p4d = p4d_offset(pgd, addr);
if (p4d_none(*p4d)) {
next = (addr + PAGE_SIZE) & PAGE_MASK;
continue;
}
get_page_bootmem(section_nr, p4d_page(*p4d), MIX_SECTION_INFO);
pud = pud_offset(p4d, addr);
if (pud_none(*pud)) {
next = (addr + PAGE_SIZE) & PAGE_MASK;
continue;
......
......@@ -535,40 +535,41 @@ static pgd_t *xen_get_user_pgd(pgd_t *pgd)
return user_ptr;
}
static void __xen_set_pgd_hyper(pgd_t *ptr, pgd_t val)
static void __xen_set_p4d_hyper(p4d_t *ptr, p4d_t val)
{
struct mmu_update u;
u.ptr = virt_to_machine(ptr).maddr;
u.val = pgd_val_ma(val);
u.val = p4d_val_ma(val);
xen_extend_mmu_update(&u);
}
/*
* Raw hypercall-based set_pgd, intended for in early boot before
* Raw hypercall-based set_p4d, intended for in early boot before
* there's a page structure. This implies:
* 1. The only existing pagetable is the kernel's
* 2. It is always pinned
* 3. It has no user pagetable attached to it
*/
static void __init xen_set_pgd_hyper(pgd_t *ptr, pgd_t val)
static void __init xen_set_p4d_hyper(p4d_t *ptr, p4d_t val)
{
preempt_disable();
xen_mc_batch();
__xen_set_pgd_hyper(ptr, val);
__xen_set_p4d_hyper(ptr, val);
xen_mc_issue(PARAVIRT_LAZY_MMU);
preempt_enable();
}
static void xen_set_pgd(pgd_t *ptr, pgd_t val)
static void xen_set_p4d(p4d_t *ptr, p4d_t val)
{
pgd_t *user_ptr = xen_get_user_pgd(ptr);
pgd_t *user_ptr = xen_get_user_pgd((pgd_t *)ptr);
pgd_t pgd_val;
trace_xen_mmu_set_pgd(ptr, user_ptr, val);
trace_xen_mmu_set_p4d(ptr, (p4d_t *)user_ptr, val);
/* If page is not pinned, we can just update the entry
directly */
......@@ -576,7 +577,8 @@ static void xen_set_pgd(pgd_t *ptr, pgd_t val)
*ptr = val;
if (user_ptr) {
WARN_ON(xen_page_pinned(user_ptr));
*user_ptr = val;
pgd_val.pgd = p4d_val_ma(val);
*user_ptr = pgd_val;
}
return;
}
......@@ -585,9 +587,9 @@ static void xen_set_pgd(pgd_t *ptr, pgd_t val)
user updates together. */
xen_mc_batch();
__xen_set_pgd_hyper(ptr, val);
__xen_set_p4d_hyper(ptr, val);
if (user_ptr)
__xen_set_pgd_hyper(user_ptr, val);
__xen_set_p4d_hyper((p4d_t *)user_ptr, val);
xen_mc_issue(PARAVIRT_LAZY_MMU);
}
......@@ -1591,7 +1593,6 @@ static int xen_pgd_alloc(struct mm_struct *mm)
BUG_ON(PagePinned(virt_to_page(xen_get_user_pgd(pgd))));
}
#endif
return ret;
}
......@@ -1783,7 +1784,7 @@ static void xen_release_pmd(unsigned long pfn)
xen_release_ptpage(pfn, PT_PMD);
}
#if CONFIG_PGTABLE_LEVELS == 4
#if CONFIG_PGTABLE_LEVELS >= 4
static void xen_alloc_pud(struct mm_struct *mm, unsigned long pfn)
{
xen_alloc_ptpage(mm, pfn, PT_PUD);
......@@ -2124,21 +2125,27 @@ static phys_addr_t __init xen_early_virt_to_phys(unsigned long vaddr)
*/
void __init xen_relocate_p2m(void)
{
phys_addr_t size, new_area, pt_phys, pmd_phys, pud_phys;
phys_addr_t size, new_area, pt_phys, pmd_phys, pud_phys, p4d_phys;
unsigned long p2m_pfn, p2m_pfn_end, n_frames, pfn, pfn_end;
int n_pte, n_pt, n_pmd, n_pud, idx_pte, idx_pt, idx_pmd, idx_pud;
int n_pte, n_pt, n_pmd, n_pud, n_p4d, idx_pte, idx_pt, idx_pmd, idx_pud, idx_p4d;
pte_t *pt;
pmd_t *pmd;
pud_t *pud;
p4d_t *p4d = NULL;
pgd_t *pgd;
unsigned long *new_p2m;
int save_pud;
size = PAGE_ALIGN(xen_start_info->nr_pages * sizeof(unsigned long));
n_pte = roundup(size, PAGE_SIZE) >> PAGE_SHIFT;
n_pt = roundup(size, PMD_SIZE) >> PMD_SHIFT;
n_pmd = roundup(size, PUD_SIZE) >> PUD_SHIFT;
n_pud = roundup(size, PGDIR_SIZE) >> PGDIR_SHIFT;
n_frames = n_pte + n_pt + n_pmd + n_pud;
n_pud = roundup(size, P4D_SIZE) >> P4D_SHIFT;
if (PTRS_PER_P4D > 1)
n_p4d = roundup(size, PGDIR_SIZE) >> PGDIR_SHIFT;
else
n_p4d = 0;
n_frames = n_pte + n_pt + n_pmd + n_pud + n_p4d;
new_area = xen_find_free_area(PFN_PHYS(n_frames));
if (!new_area) {
......@@ -2154,13 +2161,22 @@ void __init xen_relocate_p2m(void)
* To avoid any possible virtual address collision, just use
* 2 * PUD_SIZE for the new area.
*/
pud_phys = new_area;
p4d_phys = new_area;
pud_phys = p4d_phys + PFN_PHYS(n_p4d);
pmd_phys = pud_phys + PFN_PHYS(n_pud);
pt_phys = pmd_phys + PFN_PHYS(n_pmd);
p2m_pfn = PFN_DOWN(pt_phys) + n_pt;
pgd = __va(read_cr3());
new_p2m = (unsigned long *)(2 * PGDIR_SIZE);
idx_p4d = 0;
save_pud = n_pud;
do {
if (n_p4d > 0) {
p4d = early_memremap(p4d_phys, PAGE_SIZE);
clear_page(p4d);
n_pud = min(save_pud, PTRS_PER_P4D);
}
for (idx_pud = 0; idx_pud < n_pud; idx_pud++) {
pud = early_memremap(pud_phys, PAGE_SIZE);
clear_page(pud);
......@@ -2200,9 +2216,21 @@ void __init xen_relocate_p2m(void)
early_memunmap(pud, PAGE_SIZE);
make_lowmem_page_readonly(__va(pud_phys));
pin_pagetable_pfn(MMUEXT_PIN_L3_TABLE, PFN_DOWN(pud_phys));
if (n_p4d > 0)
set_p4d(p4d + idx_pud, __p4d(_PAGE_TABLE | pud_phys));
else
set_pgd(pgd + 2 + idx_pud, __pgd(_PAGE_TABLE | pud_phys));
pud_phys += PAGE_SIZE;
}
if (n_p4d > 0) {
save_pud -= PTRS_PER_P4D;
early_memunmap(p4d, PAGE_SIZE);
make_lowmem_page_readonly(__va(p4d_phys));
pin_pagetable_pfn(MMUEXT_PIN_L4_TABLE, PFN_DOWN(p4d_phys));
set_pgd(pgd + 2 + idx_p4d, __pgd(_PAGE_TABLE | p4d_phys));
p4d_phys += PAGE_SIZE;
}
} while (++idx_p4d < n_p4d);
/* Now copy the old p2m info to the new area. */
memcpy(new_p2m, xen_p2m_addr, size);
......@@ -2432,8 +2460,8 @@ static void __init xen_post_allocator_init(void)
pv_mmu_ops.set_pte = xen_set_pte;
pv_mmu_ops.set_pmd = xen_set_pmd;
pv_mmu_ops.set_pud = xen_set_pud;
#if CONFIG_PGTABLE_LEVELS == 4
pv_mmu_ops.set_pgd = xen_set_pgd;
#if CONFIG_PGTABLE_LEVELS >= 4
pv_mmu_ops.set_p4d = xen_set_p4d;
#endif
/* This will work as long as patching hasn't happened yet
......@@ -2442,7 +2470,7 @@ static void __init xen_post_allocator_init(void)
pv_mmu_ops.alloc_pmd = xen_alloc_pmd;
pv_mmu_ops.release_pte = xen_release_pte;
pv_mmu_ops.release_pmd = xen_release_pmd;
#if CONFIG_PGTABLE_LEVELS == 4
#if CONFIG_PGTABLE_LEVELS >= 4
pv_mmu_ops.alloc_pud = xen_alloc_pud;
pv_mmu_ops.release_pud = xen_release_pud;
#endif
......@@ -2508,10 +2536,10 @@ static const struct pv_mmu_ops xen_mmu_ops __initconst = {
.make_pmd = PV_CALLEE_SAVE(xen_make_pmd),
.pmd_val = PV_CALLEE_SAVE(xen_pmd_val),
#if CONFIG_PGTABLE_LEVELS == 4
#if CONFIG_PGTABLE_LEVELS >= 4
.pud_val = PV_CALLEE_SAVE(xen_pud_val),
.make_pud = PV_CALLEE_SAVE(xen_make_pud),
.set_pgd = xen_set_pgd_hyper,
.set_p4d = xen_set_p4d_hyper,
.alloc_pud = xen_alloc_pmd_init,
.release_pud = xen_release_pmd_init,
......
......@@ -241,21 +241,21 @@ TRACE_EVENT(xen_mmu_set_pud,
(int)sizeof(pudval_t) * 2, (unsigned long long)__entry->pudval)
);
TRACE_EVENT(xen_mmu_set_pgd,
TP_PROTO(pgd_t *pgdp, pgd_t *user_pgdp, pgd_t pgdval),
TP_ARGS(pgdp, user_pgdp, pgdval),
TRACE_EVENT(xen_mmu_set_p4d,
TP_PROTO(p4d_t *p4dp, p4d_t *user_p4dp, p4d_t p4dval),
TP_ARGS(p4dp, user_p4dp, p4dval),
TP_STRUCT__entry(
__field(pgd_t *, pgdp)
__field(pgd_t *, user_pgdp)
__field(pgdval_t, pgdval)
),
TP_fast_assign(__entry->pgdp = pgdp;
__entry->user_pgdp = user_pgdp;
__entry->pgdval = pgdval.pgd),
TP_printk("pgdp %p user_pgdp %p pgdval %0*llx (raw %0*llx)",
__entry->pgdp, __entry->user_pgdp,
(int)sizeof(pgdval_t) * 2, (unsigned long long)pgd_val(native_make_pgd(__entry->pgdval)),
(int)sizeof(pgdval_t) * 2, (unsigned long long)__entry->pgdval)
__field(p4d_t *, p4dp)
__field(p4d_t *, user_p4dp)
__field(p4dval_t, p4dval)
),
TP_fast_assign(__entry->p4dp = p4dp;
__entry->user_p4dp = user_p4dp;
__entry->p4dval = p4d_val(p4dval)),
TP_printk("p4dp %p user_p4dp %p p4dval %0*llx (raw %0*llx)",
__entry->p4dp, __entry->user_p4dp,
(int)sizeof(p4dval_t) * 2, (unsigned long long)pgd_val(native_make_pgd(__entry->p4dval)),
(int)sizeof(p4dval_t) * 2, (unsigned long long)__entry->p4dval)
);
TRACE_EVENT(xen_mmu_pud_clear,
......
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