From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.133.124]) by mx.groups.io with SMTP id smtpd.web08.8928.1635952036466691253 for ; Wed, 03 Nov 2021 08:07:16 -0700 Authentication-Results: mx.groups.io; dkim=pass header.i=@redhat.com header.s=mimecast20190719 header.b=cjIYdW60; spf=pass (domain: redhat.com, ip: 170.10.133.124, mailfrom: kraxel@redhat.com) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1635952035; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=S+fBzdOE9bbh59wyXhPVtd7uaAdQrw6Bs0pqB+DFf7Y=; b=cjIYdW60dMtNc+u1ru+SdU09DnPlLvTzmlEL9ZrIQWqKd0qSYs48U/MHHgXuHuV7oO5bxb VessjjpRN6UyBzy+sJnEwfzJGfF2VisO0T80jNqEpVKkUuSZ73rP8pSRdwubtdofp9rY6T M7RRsrIvNzoYsn0ssMM+Vmv++8YBzw4= Received: from mimecast-mx01.redhat.com (mimecast-mx01.redhat.com [209.132.183.4]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-530-xShWh2yOMCKoZ6jqRW2RXQ-1; Wed, 03 Nov 2021 11:07:10 -0400 X-MC-Unique: xShWh2yOMCKoZ6jqRW2RXQ-1 Received: from smtp.corp.redhat.com (int-mx01.intmail.prod.int.phx2.redhat.com [10.5.11.11]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id 737FB18414A0; Wed, 3 Nov 2021 15:07:09 +0000 (UTC) Received: from sirius.home.kraxel.org (unknown [10.39.194.99]) by smtp.corp.redhat.com (Postfix) with ESMTPS id 9B37757CAB; Wed, 3 Nov 2021 15:06:51 +0000 (UTC) Received: by sirius.home.kraxel.org (Postfix, from userid 1000) id 957C418221BA; Wed, 3 Nov 2021 16:06:27 +0100 (CET) From: "Gerd Hoffmann" To: devel@edk2.groups.io Cc: Jiewen Yao , Gerd Hoffmann , Jordan Justen , Ard Biesheuvel , Jiewen Yao Subject: [PATCH v2 5/5] OvmfPkg/Microvm: add README Date: Wed, 3 Nov 2021 16:06:27 +0100 Message-Id: <20211103150627.3133189-6-kraxel@redhat.com> In-Reply-To: <20211103150627.3133189-1-kraxel@redhat.com> References: <20211103150627.3133189-1-kraxel@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.11 Authentication-Results: relay.mimecast.com; auth=pass smtp.auth=CUSA124A263 smtp.mailfrom=kraxel@redhat.com X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Transfer-Encoding: 8bit Content-Type: text/plain; charset="US-ASCII" Ref: https://bugzilla.tianocore.org/show_bug.cgi?id=3599 Signed-off-by: Gerd Hoffmann Acked-by: Jiewen Yao --- OvmfPkg/Microvm/README | 50 ++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 50 insertions(+) create mode 100644 OvmfPkg/Microvm/README diff --git a/OvmfPkg/Microvm/README b/OvmfPkg/Microvm/README new file mode 100644 index 000000000000..82e2bfe03d37 --- /dev/null +++ b/OvmfPkg/Microvm/README @@ -0,0 +1,50 @@ + +This is an *experimental* port of OVMF for the qemu microvm +machine type. + +microvm background info +----------------------- + +microvm is designed for modern, virtio-based workloads. Most legacy +lpc/isa devices like pit and pic can be turned off. virtio-mmio +(i.e. '-device virtio-{blk,net,scsi,...}-device') is used for +storage/network/etc. + +Optional pcie support is available and any pcie device supported by +qemu can be plugged in (including virtio-pci if you prefer that over +virtio-mmio). + +https://qemu.readthedocs.io/en/latest/system/i386/microvm.html +https://www.kraxel.org/blog/2020/10/qemu-microvm-acpi/ + +design issues +------------- + +Not fully clear yet how to do hardware detection best. Right now +using device tree to find virtio-mmio devices and pcie host bridge, +can reuse existing ArmVirtPkg code that way. Needs patched qemu. + +features +-------- + [working] serial console + [working] direct kernel boot + [working] virtio-mmio support + [in progress] pcie support + +known limitations +----------------- + * rtc=on is required for now. + * can't use separate code/vars (actually an microvm limitation, + there is no pflash support). + * transitional virtio-pci devices do not work. microvm doesn't + support ioports on pcie, and ovmf doesn't initialize pcie devices + with ioports if there is no address space for them (even though + pcie devices are required to be functional without ioports). + +usage +----- +qemu-system-x86_64 \ + -nographic \ + -machine microvm,acpi=on,pit=off,pic=off,rtc=on \ + -bios /path/to/MICROVM.fd \ + [ ... more args here ... ] -- 2.31.1