Messages in this thread | | | Date | Wed, 28 Apr 2010 13:03:33 +0200 | From | Joerg Roedel <> | Subject | Re: [PATCH 11/22] KVM: MMU: Add infrastructure for two-level page walker |
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On Tue, Apr 27, 2010 at 03:34:10PM +0300, Avi Kivity wrote: > On 04/27/2010 01:38 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. > > > >+static inline gfn_t gpa_to_gfn(gpa_t gpa) > >+{ > >+ return (gfn_t)gpa>> PAGE_SHIFT; > >+} > >+ > > This overflows on 32-bit, since gpa_t is u64 and gfn_t is ulong.
Thinking again about it, on 32 bit the physical address width is only 36 bits. So there shouldn't be an overflow, no?
Joerg
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