linux-kernel - [PATCH 0/2] Early printk support for virtio console devices.

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [thread-next>] [day] [month] [year] [list]

Message-Id: <1366974299-17877-1-git-send-email-pranavkumar@linaro.org>
Date:	Fri, 26 Apr 2013 16:34:54 +0530
From:	Pranavkumar Sawargaonkar <pranavkumar@...aro.org>
To:	linux-arm-kernel@...ts.infradead.org
Cc:	kvmarm@...ts.cs.columbia.edu, linux-kernel@...r.kernel.org,
	rusty@...tcorp.com.au, linaro-kernel@...ts.linaro.org,
	patches@...aro.org, anup.patel@...aro.org,
	Pranavkumar Sawargaonkar <pranavkumar@...aro.org>
Subject: [PATCH 0/2] Early printk support for virtio console devices.

This patch-set implements early printk support for virtio console devices without using any hypercalls.

The current virtio early printk code in kernel expects that hypervisor will provide some mechanism generally a hypercall to support early printk. This patch-set does not break existing hypercall based early print support.

This implementation adds:
1. Early writeonly register named early_wr in virtio console's config space.
2. Host feature flags namely VIRTIO_CONSOLE_F_EARLY_WRITE for telling guest about early-write capability in console device.

Early write mechanism:
1. When a guest wants to out some character, it has to simply write the character to early_wr register in config space of virtio console device.

Pranavkumar Sawargaonkar (2):
  virtio: console: Add early writeonly register to config space
  arm64: earlyprintk support for virtio-mmio console

 Documentation/virtual/virtio-spec.txt |   13 ++++++++++--
 arch/arm64/kernel/early_printk.c      |   35 +++++++++++++++++++++++++++++++++
 include/uapi/linux/virtio_console.h   |    3 +++
 3 files changed, 49 insertions(+), 2 deletions(-)

-- 
1.7.9.5

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/