linux-kernel - Re: [PATCH v8 RESEND 0/4] Support kdump for AMD secure memory encryption(SME)

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Date:   Tue, 2 Oct 2018 13:40:12 +0200
From:   Borislav Petkov <bp@...e.de>
To:     Lianbo Jiang <lijiang@...hat.com>
Cc:     linux-kernel@...r.kernel.org, kexec@...ts.infradead.org,
        tglx@...utronix.de, mingo@...hat.com, hpa@...or.com,
        x86@...nel.org, akpm@...ux-foundation.org,
        dan.j.williams@...el.com, thomas.lendacky@....com,
        bhelgaas@...gle.com, baiyaowei@...s.chinamobile.com, tiwai@...e.de,
        brijesh.singh@....com, dyoung@...hat.com, bhe@...hat.com,
        jroedel@...e.de
Subject: Re: [PATCH v8 RESEND 0/4] Support kdump for AMD secure memory
 encryption(SME)

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 Imendörffer, Jane Smithard, Graham Norton, HRB 21284 (AG Nürnberg)