Re: [PATCH v8 RESEND 0/4] Support kdump for AMD secure memory encryption(SME)
From: Borislav Petkov
Date: Tue Oct 02 2018 - 07:41:03 EST
On Sun, Sep 30, 2018 at 11:10:29AM +0800, Lianbo Jiang wrote:
> When SME is enabled on AMD machine, it also needs to support kdump. Because
Ok, I've cleaned them up heavily and pushed them here:
https://git.kernel.org/pub/scm/linux/kernel/git/bp/bp.git, branch rc6+0-sme-kdump
However, testing on my zen box doesn't go as planned. And this is even before
your patches.
I load the kdump kernel with kexec-tools from the git-repo + the patch you
mention:
# ~/bpetkov/bin/sbin/kexec -p /boot/vmlinuz-4.19.0-rc6+ --initrd /boot/initrd-4.19.0-rc6+ --command-line="root=/dev/mapper/ubuntu--010236012132--vg-leap15 splash=silent showopts console=ttyS5,115200 console=tty0 debug ignore_loglevel log_buf_len=16M 1 irqpoll maxcpus=1 reset_devices vga=normal"
verify that it has been loaded:
# grep . /sys/kernel/kexec_*
/sys/kernel/kexec_crash_loaded:1
/sys/kernel/kexec_crash_size:268435456
/sys/kernel/kexec_loaded:0
and then trigger the panic:
# echo c > /proc/sysrq-trigger
and I see the panic happening in the serial console but then nothing.
The box resets instead.
So something's still broken.
Trying the kexec -l/kexec -e game works - the second kernel gets kexeced
properly.
--
Regards/Gruss,
Boris.
SUSE Linux GmbH, GF: Felix ImendÃrffer, Jane Smithard, Graham Norton, HRB 21284 (AG NÃrnberg)