From mboxrd@z Thu Jan 1 00:00:00 1970 From: Stefano Stabellini Subject: [PATCH v2 07/23] xen/arm: Xen detection and shared_info page mapping Date: Mon, 6 Aug 2012 15:27:10 +0100 Message-ID: <1344263246-28036-7-git-send-email-stefano.stabellini@eu.citrix.com> References: Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: linaro-dev-bounces-cunTk1MwBs8s++Sfvej+rw@public.gmane.org Errors-To: linaro-dev-bounces-cunTk1MwBs8s++Sfvej+rw@public.gmane.org To: linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org Cc: xen-devel-GuqFBffKawuULHF6PoxzQEEOCMrvLtNR@public.gmane.org, linaro-dev-cunTk1MwBs8s++Sfvej+rw@public.gmane.org, Ian.Campbell-Sxgqhf6Nn4DQT0dZR+AlfA@public.gmane.org, arnd-r2nGTMty4D4@public.gmane.org, konrad.wilk-QHcLZuEGTsvQT0dZR+AlfA@public.gmane.org, catalin.marinas-5wv7dgnIgG8@public.gmane.org, tim-LM2mM/qkH7s@public.gmane.org, linux-arm-kernel-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org List-Id: xen-devel@lists.xenproject.org Check for a "/xen" node in the device tree, if it is present set xen_domain_type to XEN_HVM_DOMAIN and continue initialization. Map the real shared info page using XENMEM_add_to_physmap with XENMAPSPACE_shared_info. Changes in v2: - replace pr_info with pr_debug. Signed-off-by: Stefano Stabellini --- arch/arm/xen/enlighten.c | 52 ++++++++++++++++++++++++++++++++++++++++++++++ 1 files changed, 52 insertions(+), 0 deletions(-) diff --git a/arch/arm/xen/enlighten.c b/arch/arm/xen/enlighten.c index d27c2a6..102d823 100644 --- a/arch/arm/xen/enlighten.c +++ b/arch/arm/xen/enlighten.c @@ -5,6 +5,9 @@ #include #include #include +#include +#include +#include struct start_info _xen_start_info; struct start_info *xen_start_info = &_xen_start_info; @@ -33,3 +36,52 @@ int xen_remap_domain_mfn_range(struct vm_area_struct *vma, return -ENOSYS; } EXPORT_SYMBOL_GPL(xen_remap_domain_mfn_range); + +/* + * == Xen Device Tree format == + * - /xen node; + * - compatible "arm,xen"; + * - one interrupt for Xen event notifications; + * - one memory region to map the grant_table. + */ +static int __init xen_guest_init(void) +{ + struct xen_add_to_physmap xatp; + static struct shared_info *shared_info_page = 0; + struct device_node *node; + + node = of_find_compatible_node(NULL, NULL, "arm,xen"); + if (!node) { + pr_debug("No Xen support\n"); + return 0; + } + xen_domain_type = XEN_HVM_DOMAIN; + + if (!shared_info_page) + shared_info_page = (struct shared_info *) + get_zeroed_page(GFP_KERNEL); + if (!shared_info_page) { + pr_err("not enough memory\n"); + return -ENOMEM; + } + xatp.domid = DOMID_SELF; + xatp.idx = 0; + xatp.space = XENMAPSPACE_shared_info; + xatp.gpfn = __pa(shared_info_page) >> PAGE_SHIFT; + if (HYPERVISOR_memory_op(XENMEM_add_to_physmap, &xatp)) + BUG(); + + HYPERVISOR_shared_info = (struct shared_info *)shared_info_page; + + /* xen_vcpu is a pointer to the vcpu_info struct in the shared_info + * page, we use it in the event channel upcall and in some pvclock + * related functions. We don't need the vcpu_info placement + * optimizations because we don't use any pv_mmu or pv_irq op on + * HVM. + * The shared info contains exactly 1 CPU (the boot CPU). The guest + * is required to use VCPUOP_register_vcpu_info to place vcpu info + * for secondary CPUs as they are brought up. */ + per_cpu(xen_vcpu, 0) = &HYPERVISOR_shared_info->vcpu_info[0]; + return 0; +} +core_initcall(xen_guest_init); -- 1.7.2.5