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[213.175.37.10]) by smtp.gmail.com with ESMTPSA id 2sm7915978wrq.31.2020.01.09.05.00.00 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 09 Jan 2020 05:00:01 -0800 (PST) From: Vitaly Kuznetsov To: "Dr. David Alan Gilbert" Subject: Re: [PATCH 2/2] hyperv/synic: Allocate as ram_device In-Reply-To: <20200109122237.GD6795@work-vm> References: <20200108135353.75471-1-dgilbert@redhat.com> <20200108135353.75471-3-dgilbert@redhat.com> <20200109064527-mutt-send-email-mst@kernel.org> <20200109120820.GB6795@work-vm> <20200109071454-mutt-send-email-mst@kernel.org> <20200109122237.GD6795@work-vm> Date: Thu, 09 Jan 2020 14:00:00 +0100 Message-ID: <87r208rdin.fsf@vitty.brq.redhat.com> MIME-Version: 1.0 X-MC-Unique: XsTpxWrYN52oM2Wvg6CEGg-1 X-Mimecast-Spam-Score: 0 Content-Type: text/plain Content-Transfer-Encoding: quoted-printable X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] [fuzzy] X-Received-From: 207.211.31.120 X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: jasowang@redhat.com, "Michael S. Tsirkin" , qemu-devel@nongnu.org, Roman Kagan Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" "Dr. David Alan Gilbert" writes: > And I think vhost-user will fail if you have too many sections - and > the 16 sections from synic I think will blow the slots available. > SynIC is percpu, it will allocate two 4k pages for every vCPU the guest has so we're potentially looking at hundreds of such regions. --=20 Vitaly