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Subject: Re: [Xen-devel] [PATCH v2 1/2] x86: respect memory size limiting via
 mem= parameter
To:     Ingo Molnar <mingo@kernel.org>
Cc:     sstabellini@kernel.org, x86@kernel.org,
        linux-kernel@vger.kernel.org, linux-mm@kvack.org, mingo@redhat.com,
        bp@alien8.de, hpa@zytor.com, xen-devel@lists.xenproject.org,
        boris.ostrovsky@oracle.com, tglx@linutronix.de
References: <20190130082233.23840-1-jgross@suse.com>
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 <bd5863a2-291a-43e5-7633-c84c1026a31b@suse.com>
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From:   Juergen Gross <jgross@suse.com>
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Message-ID: <39e8f05b-868b-8ab7-a310-b4ea7ef92bcc@suse.com>
Date:   Mon, 11 Feb 2019 13:35:16 +0100
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On 11/02/2019 13:23, Ingo Molnar wrote:
> 
> * Juergen Gross <jgross@suse.com> wrote:
> 
>>> If PCI devices had physical mmio memory areas above this range, we'd 
>>> still expect them to work - the option was really only meant to limit 
>>> RAM.
>>
>> No, in this case it seems to be real RAM added via PCI. The RAM is 
>> initially present in the E820 map, but the "mem=" will remove it from 
>> there again. During ACPI scan it is found (again) and will be added via 
>> hotplug mechanism, so "mem=" has no effect for that memory.
> 
> OK. With that background:
> 
> Acked-by: Ingo Molnar <mingo@kernel.org>
> 
> I suppose you want this to go upstream via the Xen tree, which is the 
> main testcase for the bug to begin with?

Yes, I'd prefer that.


Juergen