KVM: introduce gfn_to_hva_read/kvm_read_hva/kvm_read_hva_atomic
This set of functions is only used to read data from host space, in the later patch, we will only get a readonly hva in gfn_to_hva_read, and the function name is a good hint to let gfn_to_hva_read to pair with kvm_read_hva()/kvm_read_hva_atomic() Signed-off-by: NXiao Guangrong <xiaoguangrong@linux.vnet.ibm.com> Signed-off-by: NAvi Kivity <avi@redhat.com>
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