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[95.120.215.139]) by smtp.gmail.com with ESMTPSA id w17sm1867573wra.34.2019.10.17.03.45.38 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 17 Oct 2019 03:45:39 -0700 (PDT) References: <20191016101241.24405-1-slp@redhat.com> <20191016101241.24405-14-slp@redhat.com> User-agent: mu4e 1.2.0; emacs 26.2 From: Sergio Lopez To: Philippe =?utf-8?Q?Mathieu-Daud=C3=A9?= Subject: Re: [PATCH v10 13/15] docs/microvm.rst: document the new microvm machine type In-reply-to: Date: Thu, 17 Oct 2019 12:45:36 +0200 Message-ID: <87ftjrhcq7.fsf@redhat.com> MIME-Version: 1.0 Content-Type: multipart/signed; boundary="=-=-="; micalg=pgp-sha256; protocol="application/pgp-signature" X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] [fuzzy] X-Received-From: 209.132.183.28 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: ehabkost@redhat.com, mst@redhat.com, qemu-devel@nongnu.org, groug@kaod.org, kraxel@redhat.com, pbonzini@redhat.com, imammedo@redhat.com, sgarzare@redhat.com, lersek@redhat.com, rth@twiddle.net Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" --=-=-= Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable Philippe Mathieu-Daud=C3=A9 writes: > Hi Sergio, > > On 10/16/19 12:12 PM, Sergio Lopez wrote: >> +Supported devices >> +----------------- >> + >> +The microvm machine type supports the following devices: >> + >> +- ISA bus >> +- i8259 PIC (optional) >> +- i8254 PIT (optional) >> +- MC146818 RTC (optional) >> +- One ISA serial port (optional) >> +- LAPIC >> +- IOAPIC (with kernel-irqchip=3Dsplit by default) >> +- kvmclock (if using KVM) >> +- fw_cfg >> +- Up to eight virtio-mmio devices (configured by the user) > > If we have VirtIO devices, why not use virtio-serial instead of the > one on the ISA bus? The serial port on the ISA bus is simpler, and thus is supported for both SeaBIOS debugging and Linux's earlyprintk. This makes it *very* convenient for debugging boot issues. Also, as it's explained in the documentation, users that no longer need it can disable the device and just rely on virtio-console. 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