From: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
To: <arnd@arndb.de>
Cc: <linux@arm.linux.org.uk>, <linaro-dev@lists.linaro.org>,
<linux-arm-kernel@lists.infradead.org>, <tim@xen.org>,
<Ian.Campbell@citrix.com>, <konrad.wilk@oracle.com>,
<Stefano.Stabellini@eu.citrix.com>,
<xen-devel@lists.xensource.com>, <linux-kernel@vger.kernel.org>,
Stefano Stabellini <stefano.stabellini@eu.citrix.com>
Subject: [PATCH v5 07/17] xen/arm: Xen detection and shared_info page mapping
Date: Mon, 17 Sep 2012 18:38:53 +0100 [thread overview]
Message-ID: <1347903543-2135-7-git-send-email-stefano.stabellini@eu.citrix.com> (raw)
In-Reply-To: <alpine.DEB.2.02.1209171215490.29232@kaball.uk.xensource.com>
Check for a node in the device tree compatible with "xen,xen", 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 v4:
- simpler parsing of Xen version in the compatible DT node.
Changes in v3:
- use the "xen,xen" notation rather than "arm,xen";
- add an additional check on the presence of the Xen version.
Changes in v2:
- replace pr_info with pr_debug.
Signed-off-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
---
arch/arm/xen/enlighten.c | 61 ++++++++++++++++++++++++++++++++++++++++++++++
1 files changed, 61 insertions(+), 0 deletions(-)
diff --git a/arch/arm/xen/enlighten.c b/arch/arm/xen/enlighten.c
index c535540..6a0217d 100644
--- a/arch/arm/xen/enlighten.c
+++ b/arch/arm/xen/enlighten.c
@@ -5,6 +5,9 @@
#include <asm/xen/hypervisor.h>
#include <asm/xen/hypercall.h>
#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/of_irq.h>
+#include <linux/of_address.h>
struct start_info _xen_start_info;
struct start_info *xen_start_info = &_xen_start_info;
@@ -33,3 +36,61 @@ int xen_remap_domain_mfn_range(struct vm_area_struct *vma,
return -ENOSYS;
}
EXPORT_SYMBOL_GPL(xen_remap_domain_mfn_range);
+
+/*
+ * see Documentation/devicetree/bindings/arm/xen.txt for the
+ * documentation of the Xen Device Tree format.
+ */
+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;
+ int len;
+ const char *s = NULL;
+ const char *version = NULL;
+ const char *xen_prefix = "xen,xen-";
+
+ node = of_find_compatible_node(NULL, NULL, "xen,xen");
+ if (!node) {
+ pr_debug("No Xen support\n");
+ return 0;
+ }
+ s = of_get_property(node, "compatible", &len);
+ if (strlen(xen_prefix) + 3 < len &&
+ !strncmp(xen_prefix, s, strlen(xen_prefix)))
+ version = s + strlen(xen_prefix);
+ if (version == NULL) {
+ pr_debug("Xen version not found\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
next prev parent reply other threads:[~2012-09-17 17:40 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-09-17 17:37 [PATCH v5 00/17] Introduce Xen support on ARM (based on 3.6-rc5) Stefano Stabellini
2012-09-17 17:38 ` [PATCH v5 01/17] arm: initial Xen support Stefano Stabellini
2012-09-17 17:38 ` [PATCH v5 02/17] xen/arm: hypercalls Stefano Stabellini
2012-09-17 17:38 ` [PATCH v5 03/17] xen/arm: page.h definitions Stefano Stabellini
2012-09-17 17:38 ` [PATCH v5 04/17] xen/arm: sync_bitops Stefano Stabellini
2012-09-17 17:38 ` [PATCH v5 05/17] xen/arm: empty implementation of grant_table arch specific functions Stefano Stabellini
2012-09-17 17:38 ` [PATCH v5 06/17] docs: Xen ARM DT bindings Stefano Stabellini
2012-09-18 2:59 ` Rob Herring
2012-09-17 17:38 ` Stefano Stabellini [this message]
2012-09-17 17:38 ` [PATCH v5 08/17] xen/arm: Introduce xen_ulong_t for unsigned long Stefano Stabellini
2012-09-17 17:38 ` [PATCH v5 09/17] xen: do not compile manage, balloon, pci, acpi, pcpu and cpu_hotplug on ARM Stefano Stabellini
2012-09-17 17:38 ` [PATCH v5 10/17] xen/arm: introduce CONFIG_XEN " Stefano Stabellini
2012-09-17 17:38 ` [PATCH v5 11/17] xen/arm: get privilege status Stefano Stabellini
2012-09-17 17:38 ` [PATCH v5 12/17] xen/arm: initialize grant_table on ARM Stefano Stabellini
2012-09-17 17:38 ` [PATCH v5 13/17] xen/arm: receive Xen events " Stefano Stabellini
2012-09-17 17:39 ` [PATCH v5 14/17] xen/arm: implement alloc/free_xenballooned_pages with alloc_pages/kfree Stefano Stabellini
2012-09-17 17:39 ` [PATCH v5 15/17] xen/arm: compile blkfront and blkback Stefano Stabellini
2012-09-17 17:39 ` [PATCH v5 16/17] xen/arm: compile netback Stefano Stabellini
2012-09-17 17:39 ` [PATCH v5 17/17] MAINTAINERS: add myself as Xen ARM maintainer Stefano Stabellini
2012-09-18 12:34 ` [PATCH v5 00/17] Introduce Xen support on ARM (based on 3.6-rc5) Arnd Bergmann
2012-09-18 13:53 ` Konrad Rzeszutek Wilk
2012-09-18 13:57 ` Stefano Stabellini
2012-09-18 14:37 ` Konrad Rzeszutek Wilk
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