linux-kernel - Re: [PATCH v2] arm64: invalidate TLB just before turning MMU on

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Date:   Fri, 14 Dec 2018 07:54:14 -0500
From:   Qian Cai <cai@....pw>
To:     Bhupesh Sharma <bhsharma@...hat.com>
Cc:     Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will.deacon@....com>,
        Ard Biesheuvel <ard.biesheuvel@...aro.org>,
        Marc Zyngier <marc.zyngier@....com>,
        kexec mailing list <kexec@...ts.infradead.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        AKASHI Takahiro <takahiro.akashi@...aro.org>,
        James Morse <james.morse@....com>,
        linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH v2] arm64: invalidate TLB just before turning MMU on

On 12/14/18 12:01 AM, Bhupesh Sharma wrote:
> Not sure why I can't reproduce on my HPE Apollo machine, so a couple
> of questions:
> 1. How many CPUs do you enable in the kdump kernel - do you pass
> 'nr_cpus=1' to the kdump kernel to limit the maximum number of cores
> to 1 in the kdump kernel?

Yes

> 2. Which firmware version do you use on your board?

Handle 0x0000, DMI type 0, 26 bytes
BIOS Information
        Vendor: American Megatrends Inc.
        Version: L50_5.13_1.0.6
        Release Date: 07/10/2018
        Address: 0xF0000
        Runtime Size: 64 kB
        ROM Size: 64 MB
        Characteristics:
                PCI is supported
                BIOS is upgradeable
                BIOS shadowing is allowed
                Boot from CD is supported
                Selectable boot is supported
                BIOS ROM is socketed
                ACPI is supported
                BIOS boot specification is supported
                Targeted content distribution is supported
                UEFI is supported
        BIOS Revision: 6.3