Messages in this thread | | | Date | Sun, 8 Jan 2023 22:27:45 +0100 | From | Borislav Petkov <> | Subject | Re: Wake-up from suspend to RAM broken under `retbleed=stuff` |
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On Sun, Jan 08, 2023 at 05:11:59PM +0000, Joan Bruguera wrote: > Arch Linux kernel config (and I leave any new options at their defaults): > https://aur.archlinux.org/cgit/aur.git/plain/config?h=linux-mainline&id=20ffc62e08f6b0d48a088bccb6e0c3606b88083a
That .config works here.
> I need to either disable the BPF LSM or apply this patch to boot it: > https://lore.kernel.org/lkml/20230107051456.8800-1-joanbrugueram@gmail.com/ > I suspend with `systemctl suspend`. Waking up hangs with `retbleed=stuff` > and works without it.
I booted another, more modern guest which has systemd to see whether a different userspace could be the issue but it works too. > For verification I booted Fedora-Cloud-Base-Rawhide-20230107.n.0.x86_64.qcow2 > (from https://dl.fedoraproject.org/pub/fedora/linux/development/rawhide/Cloud): > qemu-system-x86_64 -nodefaults -enable-kvm -smp 1 -m 1024 -vga std \ > -hda Fedora-Cloud-Base-Rawhide-20230107.n.0.x86_64.qcow2 \ > -serial stdio -monitor tcp:127.0.0.1:55555,server,nowait > I appended `retbleed=stuff,force init=/bin/sh` to the kernel command line, > suspended through sysfs and then wrote `system_wakeup` on the QEMU monitor.
I guess I'll try that next.
And maybe try that on an Intel machine - I'm using an AMD one but the ",force" thing enables the same stuffing on AMD too even if it is not the fitting mitigation for it.
Thx.
-- Regards/Gruss, Boris.
https://people.kernel.org/tglx/notes-about-netiquette
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