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s390/kvm: set guest page states to stable on re-ipl

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The guest page state needs to be reset to stable for all pages
on initial program load via diagnose 0x308.

Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Martin Schwidefsky 2013-05-21 17:29:52 +02:00
parent b31288fa83
commit deedabb2b4
3 changed files with 76 additions and 0 deletions
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1
arch/s390/include/asm/pgalloc.h
View File

@ -22,6 +22,7 @@ unsigned long *page_table_alloc(struct mm_struct *, unsigned long);
void page_table_free(struct mm_struct *, unsigned long *);
void page_table_free_rcu(struct mmu_gather *, unsigned long *);
void page_table_reset_pgste(struct mm_struct *, unsigned long, unsigned long);
int set_guest_storage_key(struct mm_struct *mm, unsigned long addr,
unsigned long key, bool nq);

3
arch/s390/kvm/diag.c
View File

@ -13,6 +13,7 @@
#include <linux/kvm.h>
#include <linux/kvm_host.h>
#include <asm/pgalloc.h>
#include <asm/virtio-ccw.h>
#include "kvm-s390.h"
#include "trace.h"
@ -86,9 +87,11 @@ static int __diag_ipl_functions(struct kvm_vcpu *vcpu)
switch (subcode) {
case 3:
vcpu->run->s390_reset_flags = KVM_S390_RESET_CLEAR;
page_table_reset_pgste(current->mm, 0, TASK_SIZE);
break;
case 4:
vcpu->run->s390_reset_flags = 0;
page_table_reset_pgste(current->mm, 0, TASK_SIZE);
break;
default:
return -EOPNOTSUPP;

72
arch/s390/mm/pgtable.c
View File

@ -879,6 +879,78 @@ static inline void page_table_free_pgste(unsigned long *table)
__free_page(page);
}
static inline unsigned long page_table_reset_pte(struct mm_struct *mm,
pmd_t *pmd, unsigned long addr, unsigned long end)
{
pte_t *start_pte, *pte;
spinlock_t *ptl;
pgste_t pgste;
start_pte = pte_offset_map_lock(mm, pmd, addr, &ptl);
pte = start_pte;
do {
pgste = pgste_get_lock(pte);
pgste_val(pgste) &= ~_PGSTE_GPS_USAGE_MASK;
pgste_set_unlock(pte, pgste);
} while (pte++, addr += PAGE_SIZE, addr != end);
pte_unmap_unlock(start_pte, ptl);
return addr;
}
static inline unsigned long page_table_reset_pmd(struct mm_struct *mm,
pud_t *pud, unsigned long addr, unsigned long end)
{
unsigned long next;
pmd_t *pmd;
pmd = pmd_offset(pud, addr);
do {
next = pmd_addr_end(addr, end);
if (pmd_none_or_clear_bad(pmd))
continue;
next = page_table_reset_pte(mm, pmd, addr, next);
} while (pmd++, addr = next, addr != end);
return addr;
}
static inline unsigned long page_table_reset_pud(struct mm_struct *mm,
pgd_t *pgd, unsigned long addr, unsigned long end)
{
unsigned long next;
pud_t *pud;
pud = pud_offset(pgd, addr);
do {
next = pud_addr_end(addr, end);
if (pud_none_or_clear_bad(pud))
continue;
next = page_table_reset_pmd(mm, pud, addr, next);
} while (pud++, addr = next, addr != end);
return addr;
}
void page_table_reset_pgste(struct mm_struct *mm,
unsigned long start, unsigned long end)
{
unsigned long addr, next;
pgd_t *pgd;
addr = start;
down_read(&mm->mmap_sem);
pgd = pgd_offset(mm, addr);
do {
next = pgd_addr_end(addr, end);
if (pgd_none_or_clear_bad(pgd))
continue;
next = page_table_reset_pud(mm, pgd, addr, next);
} while (pgd++, addr = next, addr != end);
up_read(&mm->mmap_sem);
}
EXPORT_SYMBOL(page_table_reset_pgste);
int set_guest_storage_key(struct mm_struct *mm, unsigned long addr,
unsigned long key, bool nq)
{