linux-kernel - RE: [RESEND][PATCH v3] x86/apic/flat64: Add back the early_param("apic", parse

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Message-ID: <KU1P153MB01207E71069B0883E44218E4BF280@KU1P153MB0120.APCP153.PROD.OUTLOOK.COM>
Date:   Mon, 7 Sep 2020 06:30:47 +0000
From:   Dexuan Cui <decui@...rosoft.com>
To:     Thomas Gleixner <tglx@...utronix.de>,
        "mingo@...hat.com" <mingo@...hat.com>,
        "rdunlap@...radead.org" <rdunlap@...radead.org>,
        "bp@...en8.de" <bp@...en8.de>, "hpa@...or.com" <hpa@...or.com>,
        "x86@...nel.org" <x86@...nel.org>,
        "peterz@...radead.org" <peterz@...radead.org>,
        "allison@...utok.net" <allison@...utok.net>,
        "alexios.zavras@...el.com" <alexios.zavras@...el.com>,
        "gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>,
        "namit@...are.com" <namit@...are.com>,
        Michael Kelley <mikelley@...rosoft.com>,
        Long Li <longli@...rosoft.com>
CC:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-hyperv@...r.kernel.org" <linux-hyperv@...r.kernel.org>
Subject: RE: [RESEND][PATCH v3] x86/apic/flat64: Add back the
 early_param("apic", parse_apic)

> From: Thomas Gleixner <tglx@...utronix.de>
> Sent: Friday, July 17, 2020 6:03 AM
> [...]
Hi, I'm very sorry for this extremely late reply -- I was sidetracked by something
else and I just had a chance to revisit the issue. Thank you tglx for the comments
and suggestions, which I think are reasonable. I realized this patch is problematic.
The good news is that the LAPIC emulation bug has been fixed in the latest version
of Hyper-V and now kdump can work reliably. I think the hypervisor fix would be 
backported to old Hyper-V versions, so hopefully this won't be an issue over time.

Thanks,
-- Dexuan