linux-kernel - Re: [PATCH v3 48/59] x86/retbleed: Add SKL return thunk

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Date:   Fri, 21 Oct 2022 08:21:51 -0700
From:   Nathan Chancellor <nathan@...nel.org>
To:     Peter Zijlstra <peterz@...radead.org>
Cc:     Thomas Gleixner <tglx@...utronix.de>, linux-kernel@...r.kernel.org,
        x86@...nel.org, Linus Torvalds <torvalds@...ux-foundation.org>,
        Tim Chen <tim.c.chen@...ux.intel.com>,
        Josh Poimboeuf <jpoimboe@...nel.org>,
        Andrew Cooper <Andrew.Cooper3@...rix.com>,
        Pawan Gupta <pawan.kumar.gupta@...ux.intel.com>,
        Johannes Wikner <kwikner@...z.ch>,
        Alyssa Milburn <alyssa.milburn@...ux.intel.com>,
        Jann Horn <jannh@...gle.com>, "H.J. Lu" <hjl.tools@...il.com>,
        Joao Moreira <joao.moreira@...el.com>,
        Joseph Nuzman <joseph.nuzman@...el.com>,
        Steven Rostedt <rostedt@...dmis.org>,
        Juergen Gross <jgross@...e.com>,
        Masami Hiramatsu <mhiramat@...nel.org>,
        Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        K Prateek Nayak <kprateek.nayak@....com>,
        Eric Dumazet <edumazet@...gle.com>
Subject: Re: [PATCH v3 48/59] x86/retbleed: Add SKL return thunk

On Fri, Oct 21, 2022 at 11:53:09AM +0200, Peter Zijlstra wrote:
> On Thu, Oct 20, 2022 at 04:10:28PM -0700, Nathan Chancellor wrote:
> > This commit is now in -next as commit 5d8213864ade ("x86/retbleed: Add
> > SKL return thunk"). I just bisected an immediate reboot on my AMD test
> > system when starting a virtual machine with QEMU + KVM to it (see the
> > bisect log below). My Intel test systems do not show this.
> > Unfortunately, I do not have much more information, as there are no logs
> > in journalctl, which makes sense as the reboot occurs immediately after
> > I hit the enter key for the QEMU command.
> > 
> > If there is any further information I can provide or patches I can test
> > for further debugging, I am more than happy to do so.
> 
> Moo :-(
> 
> you happen to have a .config for me?

Sure thing, sorry I did not provide it in the first place! Attached. It
has been run through localmodconfig for the particular machine but I
assume the core pieces should still be present.

Cheers,
Nathan

View attachment ".config" of type "text/plain" (176204 bytes)