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[46.139.12.213]) by smtp.gmail.com with ESMTPSA id z3sm15386338wmi.32.2019.02.11.04.23.10 (version=TLS1_2 cipher=ECDHE-RSA-CHACHA20-POLY1305 bits=256/256); Mon, 11 Feb 2019 04:23:11 -0800 (PST) Date: Mon, 11 Feb 2019 13:23:08 +0100 From: Ingo Molnar To: Juergen Gross 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 Subject: Re: [Xen-devel] [PATCH v2 1/2] x86: respect memory size limiting via mem= parameter Message-ID: <20190211122308.GA119972@gmail.com> References: <20190130082233.23840-1-jgross@suse.com> <20190130082233.23840-2-jgross@suse.com> <20190211120650.GA74879@gmail.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.9.4 (2018-02-28) X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: * Juergen Gross 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 I suppose you want this to go upstream via the Xen tree, which is the main testcase for the bug to begin with? Thanks, ngo