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In-Reply-To: <20190225113003.GE26145@zn.tnic>
From:   Pingfan Liu <kernelfans@gmail.com>
Date:   Fri, 1 Mar 2019 11:04:19 +0800
Message-ID: <CAFgQCTvP-YDUEcHTgupr+ar+qeoj5rw1y8k+6kzrzHPzTqBkaw@mail.gmail.com>
Subject: Re: [PATCHv7] x86/kdump: bugfix, make the behavior of crashkernel=X
 consistent with kaslr
To:     Borislav Petkov <bp@alien8.de>
Cc:     Dave Young <dyoung@redhat.com>, Joerg Roedel <jroedel@suse.de>,
        Baoquan He <bhe@redhat.com>,
        Jerry Hoemann <jerry.hoemann@hpe.com>, x86@kernel.org,
        Randy Dunlap <rdunlap@infradead.org>,
        kexec@lists.infradead.org, LKML <linux-kernel@vger.kernel.org>,
        Mike Rapoport <rppt@linux.vnet.ibm.com>,
        Andrew Morton <akpm@linux-foundation.org>,
        Yinghai Lu <yinghai@kernel.org>, vgoyal@redhat.com,
        iommu@lists.linux-foundation.org, konrad.wilk@oracle.com
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Hi Borislav,

Do you think the following patch is good at present?
diff --git a/arch/x86/kernel/setup.c b/arch/x86/kernel/setup.c
index 81f9d23..9213073 100644
--- a/arch/x86/kernel/setup.c
+++ b/arch/x86/kernel/setup.c
@@ -460,7 +460,7 @@ static void __init
memblock_x86_reserve_range_setup_data(void)
 # define CRASH_ADDR_LOW_MAX    (512 << 20)
 # define CRASH_ADDR_HIGH_MAX   (512 << 20)
 #else
-# define CRASH_ADDR_LOW_MAX    (896UL << 20)
+# define CRASH_ADDR_LOW_MAX    (1 << 32)
 # define CRASH_ADDR_HIGH_MAX   MAXMEM
 #endif

For documentation, I will send another patch to improve the description.

Thanks,
Pingfan

On Mon, Feb 25, 2019 at 7:30 PM Borislav Petkov <bp@alien8.de> wrote:
>
> On Mon, Feb 25, 2019 at 07:12:16PM +0800, Dave Young wrote:
> > If we move to high as default, it will allocate 160M high + 256M low. It
>
> We won't move to high by default - we will *fall* back to high if the
> default allocation fails.
>
> > To make the process less fragile maybe we can remove the 896M limitation
> > and only try <4G then go to high.
>
> Sure, the more robust for the user, the better.
>
> --
> Regards/Gruss,
>     Boris.
>
> Good mailing practices for 400: avoid top-posting and trim the reply.