Re: [PATCH 10/10] KVM: PPC: Book3S HV: Fix calculation of guest phys address for MMIO emulation

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On 21.09.2012, at 07:39, Paul Mackerras wrote:

> In the case where the host kernel is using a 64kB base page size and
> the guest uses a 4k HPTE (hashed page table entry) to map an emulated
> MMIO device, we were calculating the guest physical address wrongly.
> We were calculating a gfn as the guest physical address shifted right
> 16 bits (PAGE_SHIFT) but then only adding back in 12 bits from the
> effective address, since the HPTE had a 4k page size.  Thus the gpa
> reported to userspace was missing 4 bits.
> 
> Instead, we now compute the guest physical address from the HPTE
> without reference to the host page size, and then compute the gfn
> by shifting the gpa right PAGE_SHIFT bits.
> 
> Reported-by: Alexey Kardashevskiy <aik@xxxxxxxxx>
> Signed-off-by: Paul Mackerras <paulus@xxxxxxxxx>

Thanks, applied to kvm-ppc-next.


Alex

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