linux-kernel - Re: [PATCHv3 00/14] x86/tdx: Add kexec support

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Date:   Thu, 16 Nov 2023 22:17:24 +0800
From:   Baoquan He <bhe@...hat.com>
To:     "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>
Cc:     Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        Dave Hansen <dave.hansen@...ux.intel.com>, x86@...nel.org,
        "Rafael J. Wysocki" <rafael@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Adrian Hunter <adrian.hunter@...el.com>,
        Kuppuswamy Sathyanarayanan 
        <sathyanarayanan.kuppuswamy@...ux.intel.com>,
        Elena Reshetova <elena.reshetova@...el.com>,
        Jun Nakajima <jun.nakajima@...el.com>,
        Rick Edgecombe <rick.p.edgecombe@...el.com>,
        Tom Lendacky <thomas.lendacky@....com>,
        "Kalra, Ashish" <ashish.kalra@....com>,
        Sean Christopherson <seanjc@...gle.com>,
        "Huang, Kai" <kai.huang@...el.com>, kexec@...ts.infradead.org,
        linux-coco@...ts.linux.dev, linux-kernel@...r.kernel.org
Subject: Re: [PATCHv3 00/14] x86/tdx: Add kexec support

On 11/16/23 at 03:56pm, Kirill A. Shutemov wrote:
> On Thu, Nov 16, 2023 at 08:10:47PM +0800, Baoquan He wrote:
> > On 11/15/23 at 03:00pm, Kirill A. Shutemov wrote:
> > > The patchset adds bits and pieces to get kexec (and crashkernel) work on
> > > TDX guest.
> > 
> > I finally got a machine of intel-eaglestream-spr as host and built a
> > tdx guest to give it a shot, the kexec reboot is working very well,
> > while kdump kernel always failed to boot up. I only built kernel and
> > installed it on tdx guest.
> > ------------------------------------------
> > [    1.422500] Run /init as init process
> > [    1.423073] Failed to execute /init (error -2)
> > [    1.423759] Run /sbin/init as init process
> > [    1.424370] Run /etc/init as init process
> > [    1.424969] Run /bin/init as init process
> > [    1.425588] Run /bin/sh as init process
> > [    1.426150] Kernel panic - not syncing: No working init found.  Try passing init= option to kernel. See Linux Documentation/admin-guide/init.rst for guidance.
> > [    1.428122] CPU: 0 PID: 1 Comm: swapper/0 Not tainted 6.7.0-rc1-00014-gbdba31ba3cec #3
> > [    1.429232] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS unknown 2/2/2022
> > [    1.430328] Call Trace:
> > [    1.430717]  <TASK>
> > [    1.431041]  dump_stack_lvl+0x33/0x50
> > [    1.431581]  panic+0x324/0x340
> > [    1.432037]  ? __pfx_kernel_init+0x10/0x10
> > [    1.432629]  kernel_init+0x174/0x1c0
> > [    1.433149]  ret_from_fork+0x2d/0x50
> > [    1.433690]  ? __pfx_kernel_init+0x10/0x10
> > [    1.434277]  ret_from_fork_asm+0x1b/0x30
> > [    1.434850]  </TASK>
> > [    1.435345] Kernel Offset: disabled
> > [    1.439216] Rebooting in 10 seconds..
> > qemu-kvm: cpus are not resettable, terminating
> 
> Could you shared your kernel config and details about your setup (qemu
> command, kernel command line, ...)?

We followed tdx-tools README to setup the environment and built host and
guest kernel, qemu command is as below. I copied the
tdx-tools/build/rhel-9/intel-mvp-tdx-kernel/tdx-base.config to the
latest upstream linxu kernel then execute 'make olddefconfig'. Because
your patchset can't be applied to the stable kernel with the 731
patches.

cd /home/root/tdx-tools
./start-qemu.sh -i /home/root/guest_tdx.qcow2 -b grub

dmesg and kernel config of guest kernel are attached.

View attachment "dmesg.log" of type "text/plain" (46863 bytes)

View attachment "tdx.config" of type "text/plain" (251044 bytes)