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

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Message-ID: <20231121104011.jfe6fzmxgl7onlfi@box.shutemov.name>
Date:   Tue, 21 Nov 2023 13:40:11 +0300
From:   "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>
To:     Baoquan He <bhe@...hat.com>
Cc:     Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, ltao@...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 Tue, Nov 21, 2023 at 06:15:13PM +0800, Baoquan He wrote:
> > > 2) anything missing to allow makedumpfile/cp access 1st kernel's memory?
> > 
> > It worked before for us, but I have not checked for a while.
> > 
> > I expected you've dropped my "if (crash) return;" debug patch I asked you
> > to tested before, right? If not, failure is expected.
> 
> Ah, my bad. I didn't actually.
> 
> Just now I rebuilt kernel and retested, vmcore saving works. Just when
> it finished kdump work and tried to reboot, the rebooting failed because
> cpus are not resettable like kexec reboot does. Not sure if this is seen
> in your test.

Yes. It is the same reboot limitation I've mentioned before.

-- 
  Kiryl Shutsemau / Kirill A. Shutemov