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Date: Fri, 17 Nov 2023 23:03:00 +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 11/17/23 at 03:47pm, Kirill A. Shutemov wrote:
> On Thu, Nov 16, 2023 at 10:45:23PM +0800, Baoquan He wrote:
> > On 11/16/23 at 10:17pm, Baoquan He wrote:
> > > 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
> >
> > This is the qemu command when execute above line of command, just for
> > your reference if you happen to not take this way.
>
> Still failed to reproduce :/
>
> Blind shot: could you check if the patch below makes any difference.
Still failed. And I found the normal reboot does't work either. I will
do more testing tomorrow, e.g use the tdx-tools's own rhel9 kernel
config and rebuild, and update host kernel too.
By the way, could you share your kernel config so that I can give it a
shot?
[ 759.284783] [1320]: Remounting '/' read-only with options 'attr2,inode64,logbufs=8,logbsize=32k,noquota'.
[ 759.291910] systemd-shutdown[1]: All filesystems unmounted.
[ 759.292831] systemd-shutdown[1]: Deactivating swaps.
[ 759.293579] systemd-shutdown[1]: All swaps deactivated.
[ 759.294329] systemd-shutdown[1]: Detaching loop devices.
[ 759.295419] systemd-shutdown[1]: All loop devices detached.
[ 759.296221] systemd-shutdown[1]: Stopping MD devices.
[ 759.296960] systemd-shutdown[1]: All MD devices stopped.
[ 759.297726] systemd-shutdown[1]: Detaching DM devices.
[ 759.298488] systemd-shutdown[1]: All DM devices detached.
[ 759.299248] systemd-shutdown[1]: All filesystems, swaps, loop devices, MD devices and DM devices detached.
[ 759.303358] systemd-shutdown[1]: Syncing filesystems and block devices.
[ 759.304583] systemd-shutdown[1]: Rebooting.
[ 759.306845] ACPI: PM: Preparing to enter system sleep state S5
[ 759.307816] reboot: Restarting system
[ 759.308355] reboot: machine restart
qemu-kvm: cpus are not resettable, terminating
>
> diff --git a/arch/x86/coco/tdx/tdx.c b/arch/x86/coco/tdx/tdx.c
> index 20e946c9a39d..8bb231e8ef9d 100644
> --- a/arch/x86/coco/tdx/tdx.c
> +++ b/arch/x86/coco/tdx/tdx.c
> @@ -875,6 +875,8 @@ static void tdx_kexec_unshare_mem(bool crash)
> /* Stop new private<->shared conversions */
> conversion_allowed = false;
>
> + if (crash)
> + return;
> /*
> * Crash kernel reaches here with interrupts disabled: can't wait for
> * conversions to finish.
> --
> Kiryl Shutsemau / Kirill A. Shutemov
>
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