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| author | Paolo Bonzini <pbonzini@redhat.com> | 2016-06-07 17:22:47 +0300 |
|---|---|---|
| committer | Paolo Bonzini <pbonzini@redhat.com> | 2016-07-05 15:41:03 +0300 |
| commit | 92176a8ede577d0ff78ab3298e06701f67ad5f51 (patch) | |
| tree | 240705f00a071112c8738b680e499c2c8537d1d5 /virt/kvm | |
| parent | 196f20ca52e8c7281932663c348fa54b82d03914 (diff) | |
| download | linux-92176a8ede577d0ff78ab3298e06701f67ad5f51.tar.xz | |
KVM: MMU: prepare to support mapping of VM_IO and VM_PFNMAP frames
Handle VM_IO like VM_PFNMAP, as is common in the rest of Linux; extract
the formula to convert hva->pfn into a new function, which will soon
gain more capabilities.
Cc: Xiao Guangrong <guangrong.xiao@linux.intel.com>
Cc: Andrea Arcangeli <aarcange@redhat.com>
Cc: Radim Krčmář <rkrcmar@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Diffstat (limited to 'virt/kvm')
| -rw-r--r-- | virt/kvm/kvm_main.c | 20 |
1 files changed, 15 insertions, 5 deletions
diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c index ef54b4c31792..5aae59e00bef 100644 --- a/virt/kvm/kvm_main.c +++ b/virt/kvm/kvm_main.c @@ -1442,6 +1442,16 @@ static bool vma_is_valid(struct vm_area_struct *vma, bool write_fault) return true; } +static int hva_to_pfn_remapped(struct vm_area_struct *vma, + unsigned long addr, bool *async, + bool write_fault, kvm_pfn_t *p_pfn) +{ + *p_pfn = ((addr - vma->vm_start) >> PAGE_SHIFT) + + vma->vm_pgoff; + BUG_ON(!kvm_is_reserved_pfn(*p_pfn)); + return 0; +} + /* * Pin guest page in memory and return its pfn. * @addr: host virtual address which maps memory to the guest @@ -1461,7 +1471,7 @@ static kvm_pfn_t hva_to_pfn(unsigned long addr, bool atomic, bool *async, { struct vm_area_struct *vma; kvm_pfn_t pfn = 0; - int npages; + int npages, r; /* we can do it either atomically or asynchronously, not both */ BUG_ON(atomic && async); @@ -1487,10 +1497,10 @@ static kvm_pfn_t hva_to_pfn(unsigned long addr, bool atomic, bool *async, if (vma == NULL) pfn = KVM_PFN_ERR_FAULT; - else if ((vma->vm_flags & VM_PFNMAP)) { - pfn = ((addr - vma->vm_start) >> PAGE_SHIFT) + - vma->vm_pgoff; - BUG_ON(!kvm_is_reserved_pfn(pfn)); + else if (vma->vm_flags & (VM_IO | VM_PFNMAP)) { + r = hva_to_pfn_remapped(vma, addr, async, write_fault, &pfn); + if (r < 0) + pfn = KVM_PFN_ERR_FAULT; } else { if (async && vma_is_valid(vma, write_fault)) *async = true; |