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Re: [Qemu-devel] Announcing qboot, a minimal x86 firmware for QEMU

From: Avi Kivity
Subject: Re: [Qemu-devel] Announcing qboot, a minimal x86 firmware for QEMU
Date: Wed, 27 May 2015 12:36:16 +0300
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:31.0) Gecko/20100101 Thunderbird/31.7.0

On 05/27/2015 12:30 PM, Paolo Bonzini wrote:

On 26/05/2015 23:25, Christopher Covington wrote:
On 05/25/2015 08:53 AM, Paolo Bonzini wrote:
On 22/05/2015 13:12, Daniel P. Berrange wrote:
particular I don't see why we need to have a SATA controller and ISA/LPC
bridge in every virt machine - root PCI bus only should be possible, as you
can provide disks via virtio-blk or virtio-scsi and serial, parallel, mouse,
floppy via PCI devices and/or by adding a USB bus in the cases where you
really need one.
I think removing the ISA/LPC bridge is hard.  It includes the real-time
clock and fw_cfg, for example.
Could VirtIO specified replacements make sense for these peripherals?
Not really.  virtio is too heavyweight and you'd be reinventing the
wheel unnecessarily.

For example, ARM's "-M virt" uses a pl011 block for the RTC, and also
uses fw_cfg.  Another commonly used ISA device is the UART, for which
again -M virt uses a pl031.

The RTC can be replaced by kvmclock, the keyboard by virtio-console. Maybe we can provide an msr- or pci- based interface to fw_cfg.

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