Il 06/05/2014 02:40, Bandan Das ha scritto:
+ ret = ctxt->ops->memory_prepare(ctxt, addr, toread,
+ exception, false,
+ NULL, &uaddr);
+ if (ret != X86EMUL_CONTINUE)
+ return ret;
+
+ if (unlikely(kvm_is_error_hva(uaddr))) {
+ r = X86EMUL_PROPAGATE_FAULT;
+ return r;
+ }
What you are doing here is basically optimizing
kvm_read_guest_virt_helper because you know that all reads will be
single-page and you do not need the "next_segment" in kvm_read_guest.
Good catch, but you can use kvm_read_guest_page instead of going through
ctxt->ops->memory_prepare. :)
Paolo
+ ret = __copy_from_user(data, (void __user *)uaddr, toread);
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