On Tue, Aug 06, 2024 at 05:46:53PM +0200, Peter Zijlstra wrote:
On Tue, Aug 06, 2024 at 05:05:15PM +0200, Peter Zijlstra wrote:
On Tue, Aug 06, 2024 at 04:56:32PM +0200, Peter Zijlstra wrote:
On Tue, Aug 06, 2024 at 07:25:42AM -0700, Guenter Roeck wrote:
I created http://server.roeck-us.net/qemu/x86-v6.11-rc2/ with all
the relevant information. Please let me know if you need anything else.
So I grabbed that config, stuck it in the build dir I used last time and
upgraded gcc-13 from 13.2 ro 13.3. But alas, my build runs successfully
:/
Is there anything else special I missed?
run.sh is not exacrlty the same this time, different CPU model, that
made it go.
OK, lemme poke at this.
Urgh, so crypto's late_initcall() does user-mode-helper based modprobe
looking for algorithms before we kick off /bin/init :/
This makes things difficult.
Urgh.
So the problem is that mark_readonly() splits a code PMD due to NX. Then
the second pti_clone_entry_text() finds a kernel PTE but a user PMD
mapping for the same address (from the early clone) and gets upset.
And we can't run mark_readonly() sooner, because initcall expect stuff
to be RW. But initcalls do modprobe, which runs user crap before we're
done initializing everything.
This is a right mess, and I really don't know what to do.