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s390/mm: Add gmap pmd invalidation and clearing 

If the host invalidates a pmd, we also have to invalidate the
corresponding gmap pmds, as well as flush them from the TLB. This is
necessary, as we don't share the pmd tables between host and guest as
we do with ptes.

The clearing part of these three new functions sets a guest pmd entry
to _SEGMENT_ENTRY_EMPTY, so the guest will fault on it and we will
re-link it.

Flushing the gmap is not necessary in the host's lazy local and csp
cases. Both purge the TLB completely.

Signed-off-by: Janosch Frank <frankja@linux.vnet.ibm.com>
Reviewed-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Acked-by: David Hildenbrand <david@redhat.com>
This commit is contained in:
Janosch Frank 2018-07-13 11:28:22 +01:00
parent 7c4b13a7c0
commit 6a3762778d
3 changed files with 143 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
arch/s390/include/asm/pgtable.h
View File

@ -1118,6 +1118,10 @@ int set_pgste_bits(struct mm_struct *mm, unsigned long addr,
int get_pgste(struct mm_struct *mm, unsigned long hva, unsigned long *pgstep);
int pgste_perform_essa(struct mm_struct *mm, unsigned long hva, int orc,
unsigned long *oldpte, unsigned long *oldpgste);
void gmap_pmdp_csp(struct mm_struct *mm, unsigned long vmaddr);
void gmap_pmdp_invalidate(struct mm_struct *mm, unsigned long vmaddr);
void gmap_pmdp_idte_local(struct mm_struct *mm, unsigned long vmaddr);
void gmap_pmdp_idte_global(struct mm_struct *mm, unsigned long vmaddr);
/*
* Certain architectures need to do special things when PTEs

125
arch/s390/mm/gmap.c
View File

@ -2221,6 +2221,131 @@ void ptep_notify(struct mm_struct *mm, unsigned long vmaddr,
}
EXPORT_SYMBOL_GPL(ptep_notify);
static void pmdp_notify_gmap(struct gmap *gmap, pmd_t *pmdp,
unsigned long gaddr)
{
pmd_val(*pmdp) &= ~_SEGMENT_ENTRY_GMAP_IN;
gmap_call_notifier(gmap, gaddr, gaddr + HPAGE_SIZE - 1);
}
static void gmap_pmdp_clear(struct mm_struct *mm, unsigned long vmaddr,
int purge)
{
pmd_t *pmdp;
struct gmap *gmap;
unsigned long gaddr;
rcu_read_lock();
list_for_each_entry_rcu(gmap, &mm->context.gmap_list, list) {
spin_lock(&gmap->guest_table_lock);
pmdp = (pmd_t *)radix_tree_delete(&gmap->host_to_guest,
vmaddr >> PMD_SHIFT);
if (pmdp) {
gaddr = __gmap_segment_gaddr((unsigned long *)pmdp);
pmdp_notify_gmap(gmap, pmdp, gaddr);
WARN_ON(pmd_val(*pmdp) & ~_SEGMENT_ENTRY_HARDWARE_BITS_LARGE);
if (purge)
__pmdp_csp(pmdp);
pmd_val(*pmdp) = _SEGMENT_ENTRY_EMPTY;
}
spin_unlock(&gmap->guest_table_lock);
}
rcu_read_unlock();
}
/**
* gmap_pmdp_invalidate - invalidate all affected guest pmd entries without
* flushing
* @mm: pointer to the process mm_struct
* @vmaddr: virtual address in the process address space
*/
void gmap_pmdp_invalidate(struct mm_struct *mm, unsigned long vmaddr)
{
gmap_pmdp_clear(mm, vmaddr, 0);
}
EXPORT_SYMBOL_GPL(gmap_pmdp_invalidate);
/**
* gmap_pmdp_csp - csp all affected guest pmd entries
* @mm: pointer to the process mm_struct
* @vmaddr: virtual address in the process address space
*/
void gmap_pmdp_csp(struct mm_struct *mm, unsigned long vmaddr)
{
gmap_pmdp_clear(mm, vmaddr, 1);
}
EXPORT_SYMBOL_GPL(gmap_pmdp_csp);
/**
* gmap_pmdp_idte_local - invalidate and clear a guest pmd entry
* @mm: pointer to the process mm_struct
* @vmaddr: virtual address in the process address space
*/
void gmap_pmdp_idte_local(struct mm_struct *mm, unsigned long vmaddr)
{
unsigned long *entry, gaddr;
struct gmap *gmap;
pmd_t *pmdp;
rcu_read_lock();
list_for_each_entry_rcu(gmap, &mm->context.gmap_list, list) {
spin_lock(&gmap->guest_table_lock);
entry = radix_tree_delete(&gmap->host_to_guest,
vmaddr >> PMD_SHIFT);
if (entry) {
pmdp = (pmd_t *)entry;
gaddr = __gmap_segment_gaddr(entry);
pmdp_notify_gmap(gmap, pmdp, gaddr);
WARN_ON(*entry & ~_SEGMENT_ENTRY_HARDWARE_BITS_LARGE);
if (MACHINE_HAS_TLB_GUEST)
__pmdp_idte(gaddr, pmdp, IDTE_GUEST_ASCE,
gmap->asce, IDTE_LOCAL);
else if (MACHINE_HAS_IDTE)
__pmdp_idte(gaddr, pmdp, 0, 0, IDTE_LOCAL);
*entry = _SEGMENT_ENTRY_EMPTY;
}
spin_unlock(&gmap->guest_table_lock);
}
rcu_read_unlock();
}
EXPORT_SYMBOL_GPL(gmap_pmdp_idte_local);
/**
* gmap_pmdp_idte_global - invalidate and clear a guest pmd entry
* @mm: pointer to the process mm_struct
* @vmaddr: virtual address in the process address space
*/
void gmap_pmdp_idte_global(struct mm_struct *mm, unsigned long vmaddr)
{
unsigned long *entry, gaddr;
struct gmap *gmap;
pmd_t *pmdp;
rcu_read_lock();
list_for_each_entry_rcu(gmap, &mm->context.gmap_list, list) {
spin_lock(&gmap->guest_table_lock);
entry = radix_tree_delete(&gmap->host_to_guest,
vmaddr >> PMD_SHIFT);
if (entry) {
pmdp = (pmd_t *)entry;
gaddr = __gmap_segment_gaddr(entry);
pmdp_notify_gmap(gmap, pmdp, gaddr);
WARN_ON(*entry & ~_SEGMENT_ENTRY_HARDWARE_BITS_LARGE);
if (MACHINE_HAS_TLB_GUEST)
__pmdp_idte(gaddr, pmdp, IDTE_GUEST_ASCE,
gmap->asce, IDTE_GLOBAL);
else if (MACHINE_HAS_IDTE)
__pmdp_idte(gaddr, pmdp, 0, 0, IDTE_GLOBAL);
else
__pmdp_csp(pmdp);
*entry = _SEGMENT_ENTRY_EMPTY;
}
spin_unlock(&gmap->guest_table_lock);
}
rcu_read_unlock();
}
EXPORT_SYMBOL_GPL(gmap_pmdp_idte_global);
static inline void thp_split_mm(struct mm_struct *mm)
{
#ifdef CONFIG_TRANSPARENT_HUGEPAGE

17
arch/s390/mm/pgtable.c
View File

@ -347,18 +347,27 @@ static inline void pmdp_idte_local(struct mm_struct *mm,
mm->context.asce, IDTE_LOCAL);
else
__pmdp_idte(addr, pmdp, 0, 0, IDTE_LOCAL);
if (mm_has_pgste(mm))
gmap_pmdp_idte_local(mm, addr);
}
static inline void pmdp_idte_global(struct mm_struct *mm,
unsigned long addr, pmd_t *pmdp)
{
if (MACHINE_HAS_TLB_GUEST)
if (MACHINE_HAS_TLB_GUEST) {
__pmdp_idte(addr, pmdp, IDTE_NODAT | IDTE_GUEST_ASCE,
mm->context.asce, IDTE_GLOBAL);
else if (MACHINE_HAS_IDTE)
if (mm_has_pgste(mm))
gmap_pmdp_idte_global(mm, addr);
} else if (MACHINE_HAS_IDTE) {
__pmdp_idte(addr, pmdp, 0, 0, IDTE_GLOBAL);
else
if (mm_has_pgste(mm))
gmap_pmdp_idte_global(mm, addr);
} else {
__pmdp_csp(pmdp);
if (mm_has_pgste(mm))
gmap_pmdp_csp(mm, addr);
}
}
static inline pmd_t pmdp_flush_direct(struct mm_struct *mm,
@ -392,6 +401,8 @@ static inline pmd_t pmdp_flush_lazy(struct mm_struct *mm,
cpumask_of(smp_processor_id()))) {
pmd_val(*pmdp) |= _SEGMENT_ENTRY_INVALID;
mm->context.flush_mm = 1;
if (mm_has_pgste(mm))
gmap_pmdp_invalidate(mm, addr);
} else {
pmdp_idte_global(mm, addr, pmdp);
}