Re: hv_hypercall_pg page permissios

[Christoph Hellwig]

On Tue, Jun 16, 2020 at 12:40:32PM +0200, Peter Zijlstra wrote:
> On Tue, Jun 16, 2020 at 12:33:13PM +0200, Christoph Hellwig wrote:
> > sorry, s/ftrace/kprobes/.  See my updated branch here:
> > 
> > http://git.infradead.org/users/hch/misc.git/shortlog/refs/heads/module_alloc-cleanup
> 
> Ah the insn slot page, yes. Didn't you just loose VM_FLUSH_RESET_PERMS
> there?

Yes, we did.  vmalloc_exec had it, but given that module_alloc didn't
allocate executable on x86 it didn't.  I guess we should make sure it
is set by the low-level vmalloc code if exec permissions are set to
sort this mess out.