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KVM: do not treat noslot pfn as a error pfn

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This patch filters noslot pfn out from error pfns based on Marcelo comment:
noslot pfn is not a error pfn

After this patch,
- is_noslot_pfn indicates that the gfn is not in slot
- is_error_pfn indicates that the gfn is in slot but the error is occurred
  when translate the gfn to pfn
- is_error_noslot_pfn indicates that the pfn either it is error pfns or it
  is noslot pfn
And is_invalid_pfn can be removed, it makes the code more clean

Signed-off-by: Xiao Guangrong <[email protected]>
Signed-off-by: Marcelo Tosatti <[email protected]>
This commit is contained in:
Xiao Guangrong 2012-10-16 20:10:59 +08:00 • committed by Marcelo Tosatti
commit 81c52c56e2
9 changed files with 32 additions and 20 deletions
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4
virt/kvm/iommu.c
View file

@ -52,7 +52,7 @@ static pfn_t kvm_pin_pages(struct kvm_memory_slot *slot, gfn_t gfn,
end_gfn = gfn + (size >> PAGE_SHIFT);
gfn += 1;
if (is_error_pfn(pfn))
if (is_error_noslot_pfn(pfn))
return pfn;
while (gfn < end_gfn)
@ -106,7 +106,7 @@ int kvm_iommu_map_pages(struct kvm *kvm, struct kvm_memory_slot *slot)
* important because we unmap and unpin in 4kb steps later.
*/
pfn = kvm_pin_pages(slot, gfn, page_size);
if (is_error_pfn(pfn)) {
if (is_error_noslot_pfn(pfn)) {
gfn += 1;
continue;
}

6
virt/kvm/kvm_main.c
View file

@ -1208,7 +1208,7 @@ __gfn_to_pfn_memslot(struct kvm_memory_slot *slot, gfn_t gfn, bool atomic,
return KVM_PFN_ERR_RO_FAULT;
if (kvm_is_error_hva(addr))
return KVM_PFN_ERR_BAD;
return KVM_PFN_NOSLOT;
/* Do not map writable pfn in the readonly memslot. */
if (writable && memslot_is_readonly(slot)) {
@ -1290,7 +1290,7 @@ EXPORT_SYMBOL_GPL(gfn_to_page_many_atomic);
static struct page *kvm_pfn_to_page(pfn_t pfn)
{
if (is_error_pfn(pfn))
if (is_error_noslot_pfn(pfn))
return KVM_ERR_PTR_BAD_PAGE;
if (kvm_is_mmio_pfn(pfn)) {
@ -1322,7 +1322,7 @@ EXPORT_SYMBOL_GPL(kvm_release_page_clean);
void kvm_release_pfn_clean(pfn_t pfn)
{
if (!is_error_pfn(pfn) && !kvm_is_mmio_pfn(pfn))
if (!is_error_noslot_pfn(pfn) && !kvm_is_mmio_pfn(pfn))
put_page(pfn_to_page(pfn));
}
EXPORT_SYMBOL_GPL(kvm_release_pfn_clean);