From mboxrd@z Thu Jan 1 00:00:00 1970 From: marc.zyngier@arm.com (Marc Zyngier) Date: Thu, 18 Apr 2013 17:59:43 +0200 Subject: [RFC] arm64: Early printk support for virtio-mmio console devices. In-Reply-To: <51701084.5050706@codeaurora.org> References: <1366264344-28025-1-git-send-email-pranavkumar@linaro.org> <51701084.5050706@codeaurora.org> Message-ID: <217a4f2dd017af16204391012751e9f9@localhost> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org On Thu, 18 Apr 2013 11:25:56 -0400, Christopher Covington wrote: > Hi Pranavkumar, > > On 04/18/2013 01:52 AM, PranavkumarSawargaonkar wrote: >> From: Pranavkumar Sawargaonkar >> >> This patch implements early printk support for virtio-mmio console >> devices >> without using any hypercalls. > > Is it possible that using DCC might be an easier solution? You would end up with the exact same problem as with a hypercall based solution: once you're in the hypervisor, what do you do with the data? You end up having to invent another channel to forward it down to your platform emulation in order to have it printed where the user expects it. Using a MMIO based solution is probably the best solution, as it uses the existing infrastructure. M. -- Fast, cheap, reliable. Pick two.