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s390/kvm: page table invalidation notifier 

Pass an address range to the page table invalidation notifier
for KVM. This allows to notify changes that affect a larger
virtual memory area, e.g. for 1MB pages.

Reviewed-by: David Hildenbrand <dahi@linux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
This commit is contained in:
Martin Schwidefsky 2016-03-08 11:52:54 +01:00 committed by Christian Borntraeger
parent 64672c95ea
commit 414d3b0749
3 changed files with 31 additions and 9 deletions
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3
arch/s390/include/asm/gmap.h
View File

@ -39,7 +39,8 @@ struct gmap {
*/
struct gmap_notifier {
struct list_head list;
void (*notifier_call)(struct gmap *gmap, unsigned long gaddr);
void (*notifier_call)(struct gmap *gmap, unsigned long start,
unsigned long end);
};
struct gmap *gmap_alloc(struct mm_struct *mm, unsigned long limit);

18
arch/s390/kvm/kvm-s390.c
View File

@ -150,7 +150,8 @@ int kvm_arch_hardware_enable(void)
return 0;
}
static void kvm_gmap_notifier(struct gmap *gmap, unsigned long address);
static void kvm_gmap_notifier(struct gmap *gmap, unsigned long start,
unsigned long end);
/*
* This callback is executed during stop_machine(). All CPUs are therefore
@ -1976,16 +1977,23 @@ void kvm_s390_sync_request(int req, struct kvm_vcpu *vcpu)
kvm_s390_vcpu_request(vcpu);
}
static void kvm_gmap_notifier(struct gmap *gmap, unsigned long address)
static void kvm_gmap_notifier(struct gmap *gmap, unsigned long start,
unsigned long end)
{
int i;
struct kvm *kvm = gmap->private;
struct kvm_vcpu *vcpu;
unsigned long prefix;
int i;
if (start >= 1UL << 31)
/* We are only interested in prefix pages */
return;
kvm_for_each_vcpu(i, vcpu, kvm) {
/* match against both prefix pages */
if (kvm_s390_get_prefix(vcpu) == (address & ~0x1000UL)) {
VCPU_EVENT(vcpu, 2, "gmap notifier for %lx", address);
prefix = kvm_s390_get_prefix(vcpu);
if (prefix <= end && start <= prefix + 2*PAGE_SIZE - 1) {
VCPU_EVENT(vcpu, 2, "gmap notifier for %lx-%lx",
start, end);
kvm_s390_sync_request(KVM_REQ_MMU_RELOAD, vcpu);
}
}

19
arch/s390/mm/gmap.c
View File

@ -572,6 +572,21 @@ void gmap_unregister_ipte_notifier(struct gmap_notifier *nb)
}
EXPORT_SYMBOL_GPL(gmap_unregister_ipte_notifier);
/**
* gmap_call_notifier - call all registered invalidation callbacks
* @gmap: pointer to guest mapping meta data structure
* @start: start virtual address in the guest address space
* @end: end virtual address in the guest address space
*/
static void gmap_call_notifier(struct gmap *gmap, unsigned long start,
unsigned long end)
{
struct gmap_notifier *nb;
list_for_each_entry(nb, &gmap_notifier_list, list)
nb->notifier_call(gmap, start, end);
}
/**
* gmap_ipte_notify - mark a range of ptes for invalidation notification
* @gmap: pointer to guest mapping meta data structure
@ -643,7 +658,6 @@ void ptep_notify(struct mm_struct *mm, unsigned long vmaddr, pte_t *pte)
{
unsigned long offset, gaddr;
unsigned long *table;
struct gmap_notifier *nb;
struct gmap *gmap;
offset = ((unsigned long) pte) & (255 * sizeof(pte_t));
@ -655,8 +669,7 @@ void ptep_notify(struct mm_struct *mm, unsigned long vmaddr, pte_t *pte)
if (!table)
continue;
gaddr = __gmap_segment_gaddr(table) + offset;
list_for_each_entry(nb, &gmap_notifier_list, list)
nb->notifier_call(gmap, gaddr);
gmap_call_notifier(gmap, gaddr, gaddr + PAGE_SIZE - 1);
}
spin_unlock(&gmap_notifier_lock);
}