linux-kernel - Re: [PATCH] x86/kexec: Exclude GART aperture from vmcore

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Date:   Mon, 6 Nov 2017 17:27:29 +0800
From:   Baoquan He <bhe@...hat.com>
To:     Jiri Bohac <jbohac@...e.cz>
Cc:     David Airlie <airlied@...ux.ie>, Dave Young <dyoung@...hat.com>,
        Vivek Goyal <vgoyal@...hat.com>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Toshi Kani <toshi.kani@....com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>,
        "H. Peter Anvin" <hpa@...or.com>, linux-kernel@...r.kernel.org,
        kexec@...ts.infradead.org, Borislav Petkov <bp@...en8.de>
Subject: Re: [PATCH] x86/kexec: Exclude GART aperture from vmcore

Hi Jiri,

Thanks for providing these information.

On 11/06/17 at 10:01am, Jiri Bohac wrote:
> Hi Baoquan,
> 
> 	[    0.000000] memblock_reserve: [0x00000000b8000000-0x00000000bbffffff] gart_iommu_hole_init+0x396/0x4b6
> 	[    0.000000] AGP: Mapping aperture over RAM [mem 0xb8000000-0xbbffffff] (65536KB)
> ^^^^^

> /proc/iomem:
> 	00000000-00000fff : Reserved
> 	00001000-0009d7ff : System RAM
> 	0009d800-0009ffff : Reserved
> 	000a0000-000bffff : PCI Bus 0000:00
> 	000c0000-000cafff : PCI Bus 0000:00
> 	  000c0000-000cafff : Video ROM
> 	000cb000-000ccfff : Adapter ROM
> 	000ce000-000fffff : Reserved
> 	  000f0000-000fffff : System ROM
> 	00100000-c7e7ffff : System RAM
> 	  0b000000-0b792eb5 : Kernel code
> 	  0b792eb6-0bd5d47f : Kernel data
> 	  0c274000-0c3c8fff : Kernel bss
> 	  b7000000-c6ffffff : Crash kernel

It's weird, gart aperture located in crashkernel region? Or we need
reserve the low crashkernel memory for gart aperture usage, Just like
swiotlb?

Sorry, I am not familiar with gart.

Thanks
Baoquan


> 	c7e80000-c7e8afff : ACPI Tables
> 	c7e8b000-c7e8cfff : ACPI Non-volatile Storage
> 	c7e8d000-c7ffffff : Reserved
> 	c8000000-ce0fffff : PCI Bus 0000:00
> 	  c8000000-c80003ff : IOAPIC 1
> 	  c8014000-c80143ff : 0000:00:11.0
> 	    c8014000-c80143ff : ahci
> 	  c8014400-c80144ff : 0000:00:12.2
> 	    c8014400-c80144ff : ehci_hcd