> Is that OK if I use the following code?
...
> if (is_in_pci_mem_space(addr)) {
> if (!user_mode(regs)) {
> ret = probe_kernel_address(regs->nip, inst);
>
> if (!ret) {
> rd = get_rt(inst);
> regs->gpr[rd] = 0xffffffff;
> }
> }
Don't you need to check that the instruction is actually
a memory read?
I also know that there are people mapping PCIe addresses
directly into userspace for 'simple' access to things like
fpga devices.
I suspect that such devices are the ones likely to generate
the faulting cycles. So you probably do want to handle
faults from normal userspace addresses.
David
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