From mboxrd@z Thu Jan 1 00:00:00 1970 From: Christoffer Dall Date: Fri, 31 May 2013 16:49:59 -0700 Subject: [U-Boot] [PATCH 0/6] ARMv7: Add HYP mode switching support In-Reply-To: <51A844DC.8010303@linaro.org> References: <1367846270-1827-1-git-send-email-andre.przywara@linaro.org> <20130531061115.GG3189@ubuntu> <51A844DC.8010303@linaro.org> Message-ID: <20130531234959.GB17432@ubuntu> List-Id: MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: u-boot@lists.denx.de On Fri, May 31, 2013 at 08:36:12AM +0200, Andre Przywara wrote: > On 05/31/2013 08:11 AM, Christoffer Dall wrote: > > On Mon, May 06, 2013 at 03:17:44PM +0200, Andre Przywara wrote: > >> (for GIT URL and Changelog see below) > >> > >> ARM CPUs with the virtualization extension have a new mode called > >> HYP mode, which allows hypervisors to safely control and monitor > >> guests. The current hypervisor (KVM and Xen) implementations > >> require the kernel to be entered in that HYP mode. > >> > >> This patch series introduces a configuration variable > >> CONFIG_ARMV7_VIRT which enables code to switch all cores into HYP > >> mode. This is done automatically during execution of the bootm > >> command (but could also be done earlier - U-Boot runs fine in HYP > >> mode without MMU usage). > > > > I forget the u-boot specifics here, but if you boot over networking, for > > example, does that eventually end up calling bootm or would Hyp mode not > > be entered in this case? > > Despite the naming "bootm" is eventually always called when booting > Linux, even bootz is a wrapper around this. Same with network boot. So > unless you show me a case where this isn't, I think this is fine. > Cool, I have no idea, I just wanted to be sure. Thanks, -Christoffer