Re: [PATCH 3/5] x86/vsyscall: Add vsyscall emulation for #GP

[Dave Hansen]

On 3/4/26 16:10, Sohil Mehta wrote:
> Vsyscall emulation has two modes of operation, specified by the
> vsyscall={xonly, emulate} kernel command line option. The vsyscall page
> is marked as execute-only in XONLY mode or read-execute in EMULATE mode.

Is it really "marked as execute only"? We don't have a real execute-only
paging permission on x86, the closest we've got is memory marked with a
pkey that's got the AccessDisable bit set.

I think it's _called_ execute-only because the kernel makes it behave
like execute-only memory when it's handling the page fault. But I dobn't
think it is super accurate to say it is "marked" as execute-only.

The rest of it looks great to me, though.