arent 964ee98ccde0534548565a201827cf06d813180f author Paul Mackerras 1348169961 +0000 committer Alexander Graf 1349473133 +0200 KVM: PPC: Book3S HV: Fix calculation of guest phys address for MMIO emulation 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 Signed-off-by: Paul Mackerras Signed-off-by: Alexander Graf —vgå”#x