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authorPaolo Bonzini <pbonzini@redhat.com>2016-06-07 16:22:47 +0200
committerPaolo Bonzini <pbonzini@redhat.com>2016-07-05 14:41:03 +0200
commit92176a8ede577d0ff78ab3298e06701f67ad5f51 (patch)
tree240705f00a071112c8738b680e499c2c8537d1d5 /virt/kvm/kvm_main.c
parent196f20ca52e8c7281932663c348fa54b82d03914 (diff)
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/kvm_main.c')
-rw-r--r--virt/kvm/kvm_main.c20
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;