KVM: MMU: use kvm_release_pfn_clean to release pfn
The current code depends on the fact that fault_page is the normal page, however, we will use the error code instead of these dummy pages in the later patch, so we use kvm_release_pfn_clean to release pfn which will release the error code properly Signed-off-by: Xiao Guangrong <xiaoguangrong@linux.vnet.ibm.com> Signed-off-by: Avi Kivity <avi@redhat.com>
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