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Subject[PATCH 30/54] KVM: Convert KVM from ->nopage() to ->fault()
Date
From: npiggin@suse.de <npiggin@suse.de>

Signed-off-by: Nick Piggin <npiggin@suse.de>
Cc: kvm-devel@lists.sourceforge.net
Cc: avi@qumranet.com
Cc: linux-kernel@vger.kernel.org
Signed-off-by: Avi Kivity <avi@qumranet.com>
---
drivers/kvm/kvm_main.c | 42 +++++++++++++++---------------------------
1 files changed, 15 insertions(+), 27 deletions(-)
diff --git a/drivers/kvm/kvm_main.c b/drivers/kvm/kvm_main.c
index 3d1023c..cfb27ef 100644
--- a/drivers/kvm/kvm_main.c
+++ b/drivers/kvm/kvm_main.c
@@ -662,30 +662,24 @@ void kvm_resched(struct kvm_vcpu *vcpu)
}
EXPORT_SYMBOL_GPL(kvm_resched);

-static struct page *kvm_vcpu_nopage(struct vm_area_struct *vma,
- unsigned long address,
- int *type)
+static int kvm_vcpu_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
{
struct kvm_vcpu *vcpu = vma->vm_file->private_data;
- unsigned long pgoff;
struct page *page;

- pgoff = ((address - vma->vm_start) >> PAGE_SHIFT) + vma->vm_pgoff;
- if (pgoff == 0)
+ if (vmf->pgoff == 0)
page = virt_to_page(vcpu->run);
- else if (pgoff == KVM_PIO_PAGE_OFFSET)
+ else if (vmf->pgoff == KVM_PIO_PAGE_OFFSET)
page = virt_to_page(vcpu->pio_data);
else
- return NOPAGE_SIGBUS;
+ return VM_FAULT_SIGBUS;
get_page(page);
- if (type != NULL)
- *type = VM_FAULT_MINOR;
-
- return page;
+ vmf->page = page;
+ return 0;
}

static struct vm_operations_struct kvm_vcpu_vm_ops = {
- .nopage = kvm_vcpu_nopage,
+ .fault = kvm_vcpu_fault,
};

static int kvm_vcpu_mmap(struct file *file, struct vm_area_struct *vma)
@@ -976,31 +970,25 @@ out:
return r;
}

-static struct page *kvm_vm_nopage(struct vm_area_struct *vma,
- unsigned long address,
- int *type)
+static int kvm_vm_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
{
struct kvm *kvm = vma->vm_file->private_data;
- unsigned long pgoff;
struct page *page;

- pgoff = ((address - vma->vm_start) >> PAGE_SHIFT) + vma->vm_pgoff;
- if (!kvm_is_visible_gfn(kvm, pgoff))
- return NOPAGE_SIGBUS;
+ if (!kvm_is_visible_gfn(kvm, vmf->pgoff))
+ return VM_FAULT_SIGBUS;
/* current->mm->mmap_sem is already held so call lockless version */
- page = __gfn_to_page(kvm, pgoff);
+ page = __gfn_to_page(kvm, vmf->pgoff);
if (is_error_page(page)) {
kvm_release_page_clean(page);
- return NOPAGE_SIGBUS;
+ return VM_FAULT_SIGBUS;
}
- if (type != NULL)
- *type = VM_FAULT_MINOR;
-
- return page;
+ vmf->page = page;
+ return 0;
}

static struct vm_operations_struct kvm_vm_vm_ops = {
- .nopage = kvm_vm_nopage,
+ .fault = kvm_vm_fault,
};

static int kvm_vm_mmap(struct file *file, struct vm_area_struct *vma)
--
1.5.3.7


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