The patch titled
xen-paravirt_ops: use the hvc console infrastructure for Xen console
has been added to the -mm tree. Its filename is
xen-paravirt_ops-use-the-hvc-console-infrastructure-for-xen-console.patch
*** Remember to use Documentation/SubmitChecklist when testing your code ***
See http://www.zip.com.au/~akpm/linux/patches/stuff/added-to-mm.txt to find
out what to do about this
------------------------------------------------------
Subject: xen-paravirt_ops: use the hvc console infrastructure for Xen console
From: Jeremy Fitzhardinge <jeremy@xxxxxxxx>
Implement a Xen back-end for hvc console.
Signed-off-by: Jeremy Fitzhardinge <jeremy@xxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
arch/i386/xen/Kconfig | 1
arch/i386/xen/events.c | 3
drivers/Makefile | 3
drivers/xen/Makefile | 1
drivers/xen/hvc-console.c | 134 ++++++++++++++++++++++++++++++++++++
include/xen/events.h | 1
6 files changed, 142 insertions(+), 1 deletion(-)
diff -puN arch/i386/xen/Kconfig~xen-paravirt_ops-use-the-hvc-console-infrastructure-for-xen-console arch/i386/xen/Kconfig
--- a/arch/i386/xen/Kconfig~xen-paravirt_ops-use-the-hvc-console-infrastructure-for-xen-console
+++ a/arch/i386/xen/Kconfig
@@ -5,6 +5,7 @@
config XEN
bool "Enable support for Xen hypervisor"
depends on PARAVIRT && HZ_100 && !PREEMPT && !NO_HZ
+ select HVC_DRIVER
default y
help
This is the Linux Xen port.
diff -puN arch/i386/xen/events.c~xen-paravirt_ops-use-the-hvc-console-infrastructure-for-xen-console arch/i386/xen/events.c
--- a/arch/i386/xen/events.c~xen-paravirt_ops-use-the-hvc-console-infrastructure-for-xen-console
+++ a/arch/i386/xen/events.c
@@ -210,7 +210,7 @@ static int find_unbound_irq(void)
return irq;
}
-static int bind_evtchn_to_irq(unsigned int evtchn)
+int bind_evtchn_to_irq(unsigned int evtchn)
{
int irq;
@@ -234,6 +234,7 @@ static int bind_evtchn_to_irq(unsigned i
return irq;
}
+EXPORT_SYMBOL_GPL(bind_evtchn_to_irq);
static int bind_virq_to_irq(unsigned int virq, unsigned int cpu)
{
diff -puN drivers/Makefile~xen-paravirt_ops-use-the-hvc-console-infrastructure-for-xen-console drivers/Makefile
--- a/drivers/Makefile~xen-paravirt_ops-use-the-hvc-console-infrastructure-for-xen-console
+++ a/drivers/Makefile
@@ -15,6 +15,9 @@ obj-$(CONFIG_ACPI) += acpi/
obj-$(CONFIG_PNP) += pnp/
obj-$(CONFIG_ARM_AMBA) += amba/
+# Xen is the default console when running as a guest
+obj-$(CONFIG_XEN) += xen/
+
# char/ comes before serial/ etc so that the VT console is the boot-time
# default.
obj-y += char/
diff -puN /dev/null drivers/xen/Makefile
--- /dev/null
+++ a/drivers/xen/Makefile
@@ -0,0 +1 @@
+obj-y += hvc-console.o
diff -puN /dev/null drivers/xen/hvc-console.c
--- /dev/null
+++ a/drivers/xen/hvc-console.c
@@ -0,0 +1,134 @@
+/*
+ * xen console driver interface to hvc_console.c
+ *
+ * (c) 2007 Gerd Hoffmann <kraxel@xxxxxxx>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ */
+
+#include <linux/console.h>
+#include <linux/delay.h>
+#include <linux/err.h>
+#include <linux/init.h>
+#include <linux/types.h>
+
+#include <asm/xen/hypervisor.h>
+#include <xen/page.h>
+#include <xen/events.h>
+#include <xen/interface/io/console.h>
+
+#include "../char/hvc_console.h"
+
+#define HVC_COOKIE 0x58656e /* "Xen" in hex */
+
+static struct hvc_struct *hvc;
+static int xencons_irq;
+
+/* ------------------------------------------------------------------ */
+
+static inline struct xencons_interface *xencons_interface(void)
+{
+ return mfn_to_virt(xen_start_info->console.domU.mfn);
+}
+
+static inline void notify_daemon(void)
+{
+ /* Use evtchn: this is called early, before irq is set up. */
+ notify_remote_via_evtchn(xen_start_info->console.domU.evtchn);
+}
+
+static int write_console(uint32_t vtermno, const char *data, int len)
+{
+ struct xencons_interface *intf = xencons_interface();
+ XENCONS_RING_IDX cons, prod;
+ int sent = 0;
+
+ cons = intf->out_cons;
+ prod = intf->out_prod;
+ mb();
+ BUG_ON((prod - cons) > sizeof(intf->out));
+
+ while ((sent < len) && ((prod - cons) < sizeof(intf->out)))
+ intf->out[MASK_XENCONS_IDX(prod++, intf->out)] = data[sent++];
+
+ wmb();
+ intf->out_prod = prod;
+
+ notify_daemon();
+ return sent;
+}
+
+static int read_console(uint32_t vtermno, char *buf, int len)
+{
+ struct xencons_interface *intf = xencons_interface();
+ XENCONS_RING_IDX cons, prod;
+ int recv = 0;
+
+ cons = intf->in_cons;
+ prod = intf->in_prod;
+ mb();
+ BUG_ON((prod - cons) > sizeof(intf->in));
+
+ while (cons != prod && recv < len)
+ buf[recv++] = intf->in[MASK_XENCONS_IDX(cons++,intf->in)];
+
+ mb();
+ intf->in_cons = cons;
+
+ notify_daemon();
+ return recv;
+}
+
+static struct hv_ops hvc_ops = {
+ .get_chars = read_console,
+ .put_chars = write_console,
+};
+
+static int __init xen_init(void)
+{
+ struct hvc_struct *hp;
+
+ if (!is_running_on_xen())
+ return 0;
+
+ xencons_irq = bind_evtchn_to_irq(xen_start_info->console.domU.evtchn);
+ if (xencons_irq < 0)
+ xencons_irq = 0 /* NO_IRQ */;
+ hp = hvc_alloc(HVC_COOKIE, xencons_irq, &hvc_ops, 256);
+ if (IS_ERR(hp))
+ return PTR_ERR(hp);
+
+ hvc = hp;
+ return 0;
+}
+
+static void __exit xen_fini(void)
+{
+ if (hvc)
+ hvc_remove(hvc);
+}
+
+static int xen_cons_init(void)
+{
+ if (!is_running_on_xen())
+ return 0;
+
+ hvc_instantiate(HVC_COOKIE, 0, &hvc_ops);
+ return 0;
+}
+
+module_init(xen_init);
+module_exit(xen_fini);
+console_initcall(xen_cons_init);
diff -puN include/xen/events.h~xen-paravirt_ops-use-the-hvc-console-infrastructure-for-xen-console include/xen/events.h
--- a/include/xen/events.h~xen-paravirt_ops-use-the-hvc-console-infrastructure-for-xen-console
+++ a/include/xen/events.h
@@ -3,6 +3,7 @@
#include <linux/irq.h>
+int bind_evtchn_to_irq(unsigned int evtchn);
int bind_evtchn_to_irqhandler(unsigned int evtchn,
irqreturn_t (*handler)(int, void *),
unsigned long irqflags, const char *devname,
_
Patches currently in -mm which might be from jeremy@xxxxxxxx are
xen-paravirt_ops-fix-typo-in-sync_constant_test_bits-name.patch
xen-paravirt_ops-use-paravirt_nop-to-consistently-mark-no-op-operations.patch
xen-paravirt_ops-add-pagetable-accessors-to-pack-and-unpack-pagetable-entries.patch
xen-paravirt_ops-paravirt_ops-hooks-to-set-up-initial-pagetable.patch
xen-paravirt_ops-paravirt_ops-allocate-a-fixmap-slot.patch
xen-paravirt_ops-allow-paravirt-backend-to-choose-kernel-pmd-sharing.patch
xen-paravirt_ops-add-hooks-to-intercept-mm-creation-and-destruction.patch
xen-paravirt_ops-remove-have_arch_mm_lifetime-define-no-op-architecture-implementations.patch
xen-paravirt_ops-rename-struct-paravirt_patch-to-paravirt_patch_site-for-clarity.patch
xen-paravirt_ops-use-patch-site-ids-computed-from-offset-in-paravirt_ops-structure.patch
xen-paravirt_ops-fix-patch-site-clobbers-to-include-return-register.patch
xen-paravirt_ops-consistently-wrap-paravirt-ops-callsites-to-make-them-patchable.patch
xen-paravirt_ops-add-common-patching-machinery.patch
xen-paravirt_ops-add-apply_to_page_range-which-applies-a-function-to-a-pte-range.patch
xen-paravirt_ops-allocate-and-free-vmalloc-areas.patch
xen-paravirt_ops-add-nosegneg-capability-to-the-vsyscall-page-notes.patch
xen-paravirt_ops-add-xen-config-options.patch
xen-paravirt_ops-add-xen-interface-header-files.patch
xen-paravirt_ops-core-xen-implementation.patch
xen-paravirt_ops-use-the-hvc-console-infrastructure-for-xen-console.patch
xen-paravirt_ops-add-early-printk-support-via-hvc-console.patch
xen-paravirt_ops-add-xen-grant-table-support.patch
xen-paravirt_ops-add-the-xenbus-sysfs-and-virtual-device-hotplug-driver.patch
xen-paravirt_ops-add-xen-virtual-block-device-driver.patch
xen-paravirt_ops-add-the-xen-virtual-network-device-driver.patch
fixes-and-cleanups-for-earlyprintk-aka-boot-console.patch
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