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Subject: Re: [PATCH] x86/setup: call early_reserve_memory() earlier
To:     Borislav Petkov <bp@alien8.de>, Mike Rapoport <rppt@kernel.org>
Cc:     Jan Beulich <jbeulich@suse.com>,
        Thomas Gleixner <tglx@linutronix.de>,
        Ingo Molnar <mingo@redhat.com>,
        "H. Peter Anvin" <hpa@zytor.com>,
        =?UTF-8?Q?Marek_Marczykowski-G=c3=b3recki?= 
        <marmarek@invisiblethingslab.com>, xen-devel@lists.xenproject.org,
        x86@kernel.org, linux-kernel@vger.kernel.org
References: <20210914094108.22482-1-jgross@suse.com>
 <b15fa98e-f9a8-abac-2d16-83c29dafc517@suse.com>
 <6cdc71dc-c26d-5c59-b7dd-0eb47ab9c861@suse.com> <YUHSRKubsGT2Jvur@zn.tnic>
 <YUMJx2ckLlWKi3VF@kernel.org> <YUMclVZ5uxKV/bRZ@zn.tnic>
From:   Juergen Gross <jgross@suse.com>
Message-ID: <780610f6-de4f-625d-e242-97063cea7cc5@suse.com>
Date:   Thu, 16 Sep 2021 12:31:14 +0200
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From: Juergen Gross <jgross@suse.com>
To: Borislav Petkov <bp@alien8.de>, Mike Rapoport <rppt@kernel.org>
Cc: Jan Beulich <jbeulich@suse.com>, Thomas Gleixner <tglx@linutronix.de>,
 Ingo Molnar <mingo@redhat.com>, "H. Peter Anvin" <hpa@zytor.com>,
 =?UTF-8?Q?Marek_Marczykowski-G=c3=b3recki?=
 <marmarek@invisiblethingslab.com>, xen-devel@lists.xenproject.org,
 x86@kernel.org, linux-kernel@vger.kernel.org
Message-ID: <780610f6-de4f-625d-e242-97063cea7cc5@suse.com>
Subject: Re: [PATCH] x86/setup: call early_reserve_memory() earlier
References: <20210914094108.22482-1-jgross@suse.com>
 <b15fa98e-f9a8-abac-2d16-83c29dafc517@suse.com>
 <6cdc71dc-c26d-5c59-b7dd-0eb47ab9c861@suse.com> <YUHSRKubsGT2Jvur@zn.tnic>
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In-Reply-To: <YUMclVZ5uxKV/bRZ@zn.tnic>

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On 16.09.21 12:29, Borislav Petkov wrote:
> On Thu, Sep 16, 2021 at 12:09:27PM +0300, Mike Rapoport wrote:
>> I think the first sentence about reserving memory before memblock
>> allocations are possible is important and I think we should keep it.
>=20
> I expanded that comment this way:
>=20
>          /*
>           * Do some memory reservations *before* memory is added to mem=
block, so
>           * memblock allocations won't overwrite it.
>           *
>           * After this point, everything still needed from the boot loa=
der or
>           * firmware or kernel text should be early reserved or marked =
not RAM in
>           * e820. All other memory is free game.
>           *
>           * This call needs to happen before e820__memory_setup() which=
 calls the
>           * xen_memory_setup() on Xen dom0 which relies on the fact tha=
t those
>           * early reservations have happened already.
>           */
>=20

Yes, this seems to be an accurate description.


Juergen

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