On 09/06/2010 06:55 PM, Joerg Roedel wrote:
This patch introduces a mmu-callback to translate gpa
addresses in the walk_addr code. This is later used to
translate l2_gpa addresses into l1_gpa addresses.
@@ -534,6 +534,11 @@ static inline gpa_t gfn_to_gpa(gfn_t gfn)
return (gpa_t)gfn<< PAGE_SHIFT;
}
+static inline gfn_t gpa_to_gfn(gpa_t gpa)
+{
+ return (gfn_t)gpa>> PAGE_SHIFT;
+}
+
That's a bug - gfn_t may be smaller than gpa_t, so you're truncating
just before the shift. Note the casts in the surrounding functions are
widening, not narrowing.
However, gfn_t is u64 so the bug is only theoretical.
--
I have a truly marvellous patch that fixes the bug which this
signature is too narrow to contain.
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