diff options
author | Gleb Natapov <gleb@redhat.com> | 2010-10-19 18:13:41 +0200 |
---|---|---|
committer | Avi Kivity <avi@redhat.com> | 2010-11-21 13:14:47 +0200 |
commit | d92e50a7bf2b938cd8adfc30d930ed08f9b4320b (patch) | |
tree | 947153a2e197ec07926ad495b321b8ae9047126b /virt | |
parent | 38be5a88ae602b6f06d3d8a1a36c9be380d5b0aa (diff) |
KVM: improve hva_to_pfn() readability
Improve vma handling code readability in hva_to_pfn() and fix
async pf handling code to properly check vma returned by find_vma().
Signed-off-by: Gleb Natapov <gleb@redhat.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
Diffstat (limited to 'virt')
-rw-r--r-- | virt/kvm/kvm_main.c | 30 |
1 files changed, 17 insertions, 13 deletions
diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c index af011c3f6e1d..88d869e5a67f 100644 --- a/virt/kvm/kvm_main.c +++ b/virt/kvm/kvm_main.c @@ -952,6 +952,12 @@ unsigned long gfn_to_hva(struct kvm *kvm, gfn_t gfn) } EXPORT_SYMBOL_GPL(gfn_to_hva); +static pfn_t get_fault_pfn(void) +{ + get_page(fault_page); + return fault_pfn; +} + static pfn_t hva_to_pfn(struct kvm *kvm, unsigned long addr, bool atomic, bool *async) { @@ -981,7 +987,7 @@ static pfn_t hva_to_pfn(struct kvm *kvm, unsigned long addr, bool atomic, struct vm_area_struct *vma; if (atomic) - goto return_fault_page; + return get_fault_pfn(); down_read(¤t->mm->mmap_sem); if (is_hwpoison_address(addr)) { @@ -990,22 +996,20 @@ static pfn_t hva_to_pfn(struct kvm *kvm, unsigned long addr, bool atomic, return page_to_pfn(hwpoison_page); } - vma = find_vma(current->mm, addr); + vma = find_vma_intersection(current->mm, addr, addr+1); - if (vma == NULL || addr < vma->vm_start || - !(vma->vm_flags & VM_PFNMAP)) { - if (async && !(vma->vm_flags & VM_PFNMAP) && - (vma->vm_flags & VM_WRITE)) + if (vma == NULL) + pfn = get_fault_pfn(); + else if ((vma->vm_flags & VM_PFNMAP)) { + pfn = ((addr - vma->vm_start) >> PAGE_SHIFT) + + vma->vm_pgoff; + BUG_ON(!kvm_is_mmio_pfn(pfn)); + } else { + if (async && (vma->vm_flags & VM_WRITE)) *async = true; - up_read(¤t->mm->mmap_sem); -return_fault_page: - get_page(fault_page); - return page_to_pfn(fault_page); + pfn = get_fault_pfn(); } - - pfn = ((addr - vma->vm_start) >> PAGE_SHIFT) + vma->vm_pgoff; up_read(¤t->mm->mmap_sem); - BUG_ON(!kvm_is_mmio_pfn(pfn)); } else pfn = page_to_pfn(page[0]); |