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Commit 63f4711a authored by Linus Torvalds's avatar Linus Torvalds
Browse files

Merge git://git.kernel.org/pub/scm/virt/kvm/kvm 

Pull KVM fixes from Avi Kivity:
 "Two asynchronous page fault fixes (one guest, one host), a powerpc
  page refcount fix, and an ia64 build fix."

* git://git.kernel.org/pub/scm/virt/kvm/kvm:
  KVM: ia64: fix build due to typo
  KVM: PPC: Book3S HV: Fix refcounting of hugepages
  KVM: Do not take reference to mm during async #PF
  KVM: ensure async PF event wakes up vcpu from halt
parents 6a5beacc 331b646d

arch/ia64/kvm/kvm-ia64.c

+1 −1
Original line number Diff line number Diff line
@@ -1174,7 +1174,7 @@ out: 


bool kvm_vcpu_compatible(struct kvm_vcpu *vcpu)

{

	return irqchip_in_kernel(vcpu->kcm) == (vcpu->arch.apic != NULL);

	return irqchip_in_kernel(vcpu->kvm) == (vcpu->arch.apic != NULL);

}



int kvm_arch_vcpu_init(struct kvm_vcpu *vcpu)

arch/powerpc/kvm/book3s_64_mmu_hv.c

+13 −9
Original line number Diff line number Diff line
@@ -258,6 +258,8 @@ static long kvmppc_get_guest_page(struct kvm *kvm, unsigned long gfn, 
			    !(memslot->userspace_addr & (s - 1))) {

				start &= ~(s - 1);

				pgsize = s;

				get_page(hpage);

				put_page(page);

				page = hpage;

			}

		}
@@ -281,11 +283,8 @@ static long kvmppc_get_guest_page(struct kvm *kvm, unsigned long gfn, 
	err = 0;



 out:

	if (got) {

		if (PageHuge(page))

			page = compound_head(page);

	if (got)

		put_page(page);

	}

	return err;



 up_err:
@@ -678,8 +677,15 @@ int kvmppc_book3s_hv_page_fault(struct kvm_run *run, struct kvm_vcpu *vcpu, 
		SetPageDirty(page);



 out_put:

	if (page)

		put_page(page);

	if (page) {

		/*

		 * We drop pages[0] here, not page because page might

		 * have been set to the head page of a compound, but

		 * we have to drop the reference on the correct tail

		 * page to match the get inside gup()

		 */

		put_page(pages[0]);

	}

	return ret;



 out_unlock:
@@ -979,6 +985,7 @@ void *kvmppc_pin_guest_page(struct kvm *kvm, unsigned long gpa, 
			pa = *physp;

		}

		page = pfn_to_page(pa >> PAGE_SHIFT);

		get_page(page);

	} else {

		hva = gfn_to_hva_memslot(memslot, gfn);

		npages = get_user_pages_fast(hva, 1, 1, pages);
@@ -991,8 +998,6 @@ void *kvmppc_pin_guest_page(struct kvm *kvm, unsigned long gpa, 
		page = compound_head(page);

		psize <<= compound_order(page);

	}

	if (!kvm->arch.using_mmu_notifiers)

		get_page(page);

	offset = gpa & (psize - 1);

	if (nb_ret)

		*nb_ret = psize - offset;
@@ -1003,7 +1008,6 @@ void kvmppc_unpin_guest_page(struct kvm *kvm, void *va) 
{

	struct page *page = virt_to_page(va);



	page = compound_head(page);

	put_page(page);

}

arch/powerpc/kvm/book3s_hv.c

+0 −2
Original line number Diff line number Diff line
@@ -1192,8 +1192,6 @@ static void unpin_slot(struct kvm *kvm, int slot_id) 
				continue;

			pfn = physp[j] >> PAGE_SHIFT;

			page = pfn_to_page(pfn);

			if (PageHuge(page))

				page = compound_head(page);

			SetPageDirty(page);

			put_page(page);

		}

arch/x86/kernel/kvm.c

+1 −8
Original line number Diff line number Diff line
@@ -79,7 +79,6 @@ struct kvm_task_sleep_node { 
	u32 token;

	int cpu;

	bool halted;

	struct mm_struct *mm;

};



static struct kvm_task_sleep_head {
@@ -126,9 +125,7 @@ void kvm_async_pf_task_wait(u32 token) 


	n.token = token;

	n.cpu = smp_processor_id();

	n.mm = current->active_mm;

	n.halted = idle || preempt_count() > 1;

	atomic_inc(&n.mm->mm_count);

	init_waitqueue_head(&n.wq);

	hlist_add_head(&n.link, &b->list);

	spin_unlock(&b->lock);
@@ -161,9 +158,6 @@ EXPORT_SYMBOL_GPL(kvm_async_pf_task_wait); 
static void apf_task_wake_one(struct kvm_task_sleep_node *n)

{

	hlist_del_init(&n->link);

	if (!n->mm)

		return;

	mmdrop(n->mm);

	if (n->halted)

		smp_send_reschedule(n->cpu);

	else if (waitqueue_active(&n->wq))
@@ -207,7 +201,7 @@ again: 
		 * async PF was not yet handled.

		 * Add dummy entry for the token.

		 */

		n = kmalloc(sizeof(*n), GFP_ATOMIC);

		n = kzalloc(sizeof(*n), GFP_ATOMIC);

		if (!n) {

			/*

			 * Allocation failed! Busy wait while other cpu
@@ -219,7 +213,6 @@ again: 
		}

		n->token = token;

		n->cpu = smp_processor_id();

		n->mm = NULL;

		init_waitqueue_head(&n->wq);

		hlist_add_head(&n->link, &b->list);

	} else

arch/x86/kvm/x86.c

+1 −0
Original line number Diff line number Diff line
@@ -6581,6 +6581,7 @@ void kvm_arch_async_page_present(struct kvm_vcpu *vcpu, 
		kvm_inject_page_fault(vcpu, &fault);

	}

	vcpu->arch.apf.halted = false;

	vcpu->arch.mp_state = KVM_MP_STATE_RUNNABLE;

}



bool kvm_arch_can_inject_async_page_present(struct kvm_vcpu *vcpu)