From mboxrd@z Thu Jan 1 00:00:00 1970 From: catalin.marinas@arm.com (Catalin Marinas) Date: Fri, 16 Dec 2011 17:47:04 +0000 Subject: [Xen-devel] [ANNOUNCE] Xen port to Cortex-A15 / ARMv7 with virt extensions In-Reply-To: <4EEB822C.7010809@citrix.com> References: <201111292129.20444.arnd@arndb.de> <4EEB673D.3040608@citrix.com> <20111216165420.GE6342@arm.com> <4EEB822C.7010809@citrix.com> Message-ID: <20111216174704.GF6342@arm.com> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org On Fri, Dec 16, 2011 at 05:38:52PM +0000, David Vrabel wrote: > On 16/12/11 16:54, Catalin Marinas wrote: > > On Fri, Dec 16, 2011 at 03:43:57PM +0000, David Vrabel wrote: > >> On 30/11/11 14:11, Catalin Marinas wrote: > >>> On 30 November 2011 11:39, Stefano Stabellini > >>> wrote: > >>>> A git branch is available here (not ready for submission): > >>>> > >>>> git://xenbits.xen.org/people/sstabellini/linux-pvhvm.git arm > >>>> > >>>> the branch above is based on git://linux-arm.org/linux-2.6.git arm-lpae, > >>>> even though guests don't really need lpae support to run on Xen. > >>> > >>> Indeed, you don't really need LPAE. What you may need though is > >>> generic timers support for A15, it would allow less Hypervisor traps. > >>> For up-to-date architecture patches (well, development tree, not > >>> guaranteed to be stable), I would recommend this (they get into > >>> mainline at some point): > >>> > >>> http://git.kernel.org/?p=linux/kernel/git/cmarinas/linux-arm-arch.git;a=summary > >>> > >>> Either use master or just cherry-pick the branches that you are interested in. > >> > >> Which branches are required for the Versatile Express with the > >> Cortex-A15? I merged linux-arm-arch/arm-arch/vexpress in > > > > That's the branch if you only need VE and A15 support > > > >> but I get a > >> instruction fault immediately after branching to __mmap_switched. > >> > >> Is it not setting up the MMU correctly? > > > > Do you run this on a software model? What config options do you use? You > > would need to enable VEXPRESS_EXTENDED_MEMORY_MAP and > > ARCH_VEXPRESS_CA15X4. > > The envelope model, yes. Both those options are enabled. I've also > attached the complete config and the model configuration. > > I took a closer look at the diffs between what Stefano had in his tree > (which included a bunch of LPAE support which I don't have enabled) and > the kernel boots the addition of some isb's when the MMU is switched on. > > These were added by: "ARM: LPAE: add ISBs around MMU enabling code" > (commit 1c553c2 in your tree) which is think is only present in the LPAE > branch. Is this patch not actually specific to LPAE? Are there other > similar patches? This patch is not specific to LPAE, it's an architecture requirement and it became visible with A15. The complete patch is here: http://git.kernel.org/?p=linux/kernel/git/cmarinas/linux-arm-arch.git;a=commitdiff;h=1c553c2afdd7a57cf874a38925bc58381b28150b though I only kept it in my LPAE branch (which is on it's way to mainline for 3.3-rc1). -- Catalin