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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>
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64672c95ea
commit
414d3b0749
3 changed files with 31 additions and 9 deletions
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@ -39,7 +39,8 @@ struct gmap {
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*/
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struct gmap_notifier {
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struct list_head list;
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void (*notifier_call)(struct gmap *gmap, unsigned long gaddr);
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void (*notifier_call)(struct gmap *gmap, unsigned long start,
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unsigned long end);
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};
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struct gmap *gmap_alloc(struct mm_struct *mm, unsigned long limit);
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@ -150,7 +150,8 @@ int kvm_arch_hardware_enable(void)
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return 0;
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}
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static void kvm_gmap_notifier(struct gmap *gmap, unsigned long address);
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static void kvm_gmap_notifier(struct gmap *gmap, unsigned long start,
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unsigned long end);
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/*
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* This callback is executed during stop_machine(). All CPUs are therefore
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@ -1976,16 +1977,23 @@ void kvm_s390_sync_request(int req, struct kvm_vcpu *vcpu)
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kvm_s390_vcpu_request(vcpu);
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}
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static void kvm_gmap_notifier(struct gmap *gmap, unsigned long address)
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static void kvm_gmap_notifier(struct gmap *gmap, unsigned long start,
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unsigned long end)
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{
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int i;
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struct kvm *kvm = gmap->private;
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struct kvm_vcpu *vcpu;
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unsigned long prefix;
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int i;
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if (start >= 1UL << 31)
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/* We are only interested in prefix pages */
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return;
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kvm_for_each_vcpu(i, vcpu, kvm) {
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/* match against both prefix pages */
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if (kvm_s390_get_prefix(vcpu) == (address & ~0x1000UL)) {
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VCPU_EVENT(vcpu, 2, "gmap notifier for %lx", address);
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prefix = kvm_s390_get_prefix(vcpu);
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if (prefix <= end && start <= prefix + 2*PAGE_SIZE - 1) {
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VCPU_EVENT(vcpu, 2, "gmap notifier for %lx-%lx",
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start, end);
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kvm_s390_sync_request(KVM_REQ_MMU_RELOAD, vcpu);
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}
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}
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@ -572,6 +572,21 @@ void gmap_unregister_ipte_notifier(struct gmap_notifier *nb)
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}
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EXPORT_SYMBOL_GPL(gmap_unregister_ipte_notifier);
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/**
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* gmap_call_notifier - call all registered invalidation callbacks
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* @gmap: pointer to guest mapping meta data structure
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* @start: start virtual address in the guest address space
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* @end: end virtual address in the guest address space
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*/
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static void gmap_call_notifier(struct gmap *gmap, unsigned long start,
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unsigned long end)
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{
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struct gmap_notifier *nb;
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list_for_each_entry(nb, &gmap_notifier_list, list)
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nb->notifier_call(gmap, start, end);
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}
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/**
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* gmap_ipte_notify - mark a range of ptes for invalidation notification
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* @gmap: pointer to guest mapping meta data structure
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@ -643,7 +658,6 @@ void ptep_notify(struct mm_struct *mm, unsigned long vmaddr, pte_t *pte)
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{
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unsigned long offset, gaddr;
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unsigned long *table;
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struct gmap_notifier *nb;
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struct gmap *gmap;
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offset = ((unsigned long) pte) & (255 * sizeof(pte_t));
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@ -655,8 +669,7 @@ void ptep_notify(struct mm_struct *mm, unsigned long vmaddr, pte_t *pte)
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if (!table)
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continue;
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gaddr = __gmap_segment_gaddr(table) + offset;
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list_for_each_entry(nb, &gmap_notifier_list, list)
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nb->notifier_call(gmap, gaddr);
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gmap_call_notifier(gmap, gaddr, gaddr + PAGE_SIZE - 1);
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}
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spin_unlock(&gmap_notifier_lock);
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}
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