On 07/09/2013 04:45:10 PM, Alexander Graf wrote:
On 28.06.2013, at 11:20, Mihai Caraman wrote:
> + /* Get page size */
> + if (MAS0_GET_TLBSEL(mfspr(SPRN_MAS0)) == 0)
> + psize_shift = PAGE_SHIFT;
> + else
> + psize_shift = MAS1_GET_TSIZE(mas1) + 10;
> +
> + mas7_mas3 = (((u64) mfspr(SPRN_MAS7)) << 32) |
> + mfspr(SPRN_MAS3);
> + addr = (mas7_mas3 & (~0ULL << psize_shift)) |
> + (geaddr & ((1ULL << psize_shift) - 1ULL));
> +
> + /* Map a page and get guest's instruction */
> + page = pfn_to_page(addr >> PAGE_SHIFT);
While looking at this I just realized that you're missing a check
here. What if our IP is in some PCI BAR? Or can't we execute from
those?
We at least need to check pfn_valid() first. That'll just keep us from
accessing a bad pointer in the host kernel, though -- it won't make the
emulation actually work. If we need that, we'll probably need to
create a temporary TLB entry manually.
-Scott
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