From mboxrd@z Thu Jan 1 00:00:00 1970 From: marc.zyngier@arm.com (Marc Zyngier) Date: Thu, 18 Apr 2013 10:51:43 +0200 Subject: [RFC] arm64: Early printk support for virtio-mmio console devices. In-Reply-To: References: <1366264344-28025-1-git-send-email-pranavkumar@linaro.org> Message-ID: To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org On Thu, 18 Apr 2013 09:30:52 +0100, Peter Maydell wrote: > On 18 April 2013 07:49, Marc Zyngier wrote: >> If you need an early console, why not simply wire the 8250 emulation in >> kvmtool to be useable from the MMIO bus? I reckon this would solve your >> problem in a more elegant way... > > The other approach I thought of would be something involving > defining a hypercall interface for console I/O, in the same > way that we have hypercalls for "start cpu"/"stop cpu"/etc. > Is there any mileage in considering that approach, or is it > a non-starter? That's always possible, but that becomes architecture dependent, which means code duplication across architectures. I'd rather use the MMIO infrastructure, which has some commonalities across the board. M. -- Fast, cheap, reliable. Pick two.