ia64/xen: xencomm conversion functions for hypercalls

On ia64/xen, pointer arguments for hypercall is passed
by pseudo physical address(guest physical address.)
So such hypercalls needs address conversion functions.
This patch implements concrete conversion functions for
such hypercalls.
Signed-off-by: NAkio Takebe <takebe_akio@jp.fujitsu.com>
Signed-off-by: NYaozu (Eddie) Dong <eddie.dong@intel.com>
Signed-off-by: NIsaku Yamahata <yamahata@valinux.co.jp>
Signed-off-by: NTony Luck <tony.luck@intel.com>

arch/ia64/include/asm/xen/xcom_hcall.h

+/*
+ * Copyright (C) 2006 Tristan Gingold <tristan.gingold@bull.net>, Bull SAS
+ *
+ * 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
+ */
+
+#ifndef _ASM_IA64_XEN_XCOM_HCALL_H
+#define _ASM_IA64_XEN_XCOM_HCALL_H
+
+/* These function creates inline or mini descriptor for the parameters and
+   calls the corresponding xencomm_arch_hypercall_X.
+   Architectures should defines HYPERVISOR_xxx as xencomm_hypercall_xxx unless
+   they want to use their own wrapper.  */
+extern int xencomm_hypercall_console_io(int cmd, int count, char *str);
+
+extern int xencomm_hypercall_event_channel_op(int cmd, void *op);
+
+extern int xencomm_hypercall_xen_version(int cmd, void *arg);
+
+extern int xencomm_hypercall_physdev_op(int cmd, void *op);
+
+extern int xencomm_hypercall_grant_table_op(unsigned int cmd, void *op,
+					    unsigned int count);
+
+extern int xencomm_hypercall_sched_op(int cmd, void *arg);
+
+extern int xencomm_hypercall_multicall(void *call_list, int nr_calls);
+
+extern int xencomm_hypercall_callback_op(int cmd, void *arg);
+
+extern int xencomm_hypercall_memory_op(unsigned int cmd, void *arg);
+
+extern int xencomm_hypercall_suspend(unsigned long srec);
+
+extern long xencomm_hypercall_vcpu_op(int cmd, int cpu, void *arg);
+
+extern long xencomm_hypercall_opt_feature(void *arg);
+
+#endif /* _ASM_IA64_XEN_XCOM_HCALL_H */

arch/ia64/include/asm/xen/xencomm.h

@@ -24,6 +24,7 @@
 
 /* Must be called before any hypercall.  */
 extern void xencomm_initialize(void);
+extern int xencomm_is_initialized(void);
 
 /* Check if virtual contiguity means physical contiguity
  * where the passed address is a pointer value in virtual address.

arch/ia64/xen/Makefile

@@ -2,4 +2,4 @@
 # Makefile for Xen components
 #
 
-obj-y := hypercall.o xencomm.o
+obj-y := hypercall.o xencomm.o xcom_hcall.o

arch/ia64/xen/xcom_hcall.c

+/*
+ * 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, 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
+ *
+ *          Tristan Gingold <tristan.gingold@bull.net>
+ *
+ *          Copyright (c) 2007
+ *          Isaku Yamahata <yamahata at valinux co jp>
+ *                          VA Linux Systems Japan K.K.
+ *          consolidate mini and inline version.
+ */
+
+#include <linux/module.h>
+#include <xen/interface/xen.h>
+#include <xen/interface/memory.h>
+#include <xen/interface/grant_table.h>
+#include <xen/interface/callback.h>
+#include <xen/interface/vcpu.h>
+#include <asm/xen/hypervisor.h>
+#include <asm/xen/xencomm.h>
+
+/* Xencomm notes:
+ * This file defines hypercalls to be used by xencomm.  The hypercalls simply
+ * create inlines or mini descriptors for pointers and then call the raw arch
+ * hypercall xencomm_arch_hypercall_XXX
+ *
+ * If the arch wants to directly use these hypercalls, simply define macros
+ * in asm/xen/hypercall.h, eg:
+ *  #define HYPERVISOR_sched_op xencomm_hypercall_sched_op
+ *
+ * The arch may also define HYPERVISOR_xxx as a function and do more operations
+ * before/after doing the hypercall.
+ *
+ * Note: because only inline or mini descriptors are created these functions
+ * must only be called with in kernel memory parameters.
+ */
+
+int
+xencomm_hypercall_console_io(int cmd, int count, char *str)
+{
+	/* xen early printk uses console io hypercall before
+	 * xencomm initialization. In that case, we just ignore it.
+	 */
+	if (!xencomm_is_initialized())
+		return 0;
+
+	return xencomm_arch_hypercall_console_io
+		(cmd, count, xencomm_map_no_alloc(str, count));
+}
+EXPORT_SYMBOL_GPL(xencomm_hypercall_console_io);
+
+int
+xencomm_hypercall_event_channel_op(int cmd, void *op)
+{
+	struct xencomm_handle *desc;
+	desc = xencomm_map_no_alloc(op, sizeof(struct evtchn_op));
+	if (desc == NULL)
+		return -EINVAL;
+
+	return xencomm_arch_hypercall_event_channel_op(cmd, desc);
+}
+EXPORT_SYMBOL_GPL(xencomm_hypercall_event_channel_op);
+
+int
+xencomm_hypercall_xen_version(int cmd, void *arg)
+{
+	struct xencomm_handle *desc;
+	unsigned int argsize;
+
+	switch (cmd) {
+	case XENVER_version:
+		/* do not actually pass an argument */
+		return xencomm_arch_hypercall_xen_version(cmd, 0);
+	case XENVER_extraversion:
+		argsize = sizeof(struct xen_extraversion);
+		break;
+	case XENVER_compile_info:
+		argsize = sizeof(struct xen_compile_info);
+		break;
+	case XENVER_capabilities:
+		argsize = sizeof(struct xen_capabilities_info);
+		break;
+	case XENVER_changeset:
+		argsize = sizeof(struct xen_changeset_info);
+		break;
+	case XENVER_platform_parameters:
+		argsize = sizeof(struct xen_platform_parameters);
+		break;
+	case XENVER_get_features:
+		argsize = (arg == NULL) ? 0 : sizeof(struct xen_feature_info);
+		break;
+
+	default:
+		printk(KERN_DEBUG
+		       "%s: unknown version op %d\n", __func__, cmd);
+		return -ENOSYS;
+	}
+
+	desc = xencomm_map_no_alloc(arg, argsize);
+	if (desc == NULL)
+		return -EINVAL;
+
+	return xencomm_arch_hypercall_xen_version(cmd, desc);
+}
+EXPORT_SYMBOL_GPL(xencomm_hypercall_xen_version);
+
+int
+xencomm_hypercall_physdev_op(int cmd, void *op)
+{
+	unsigned int argsize;
+
+	switch (cmd) {
+	case PHYSDEVOP_apic_read:
+	case PHYSDEVOP_apic_write:
+		argsize = sizeof(struct physdev_apic);
+		break;
+	case PHYSDEVOP_alloc_irq_vector:
+	case PHYSDEVOP_free_irq_vector:
+		argsize = sizeof(struct physdev_irq);
+		break;
+	case PHYSDEVOP_irq_status_query:
+		argsize = sizeof(struct physdev_irq_status_query);
+		break;
+
+	default:
+		printk(KERN_DEBUG
+		       "%s: unknown physdev op %d\n", __func__, cmd);
+		return -ENOSYS;
+	}
+
+	return xencomm_arch_hypercall_physdev_op
+		(cmd, xencomm_map_no_alloc(op, argsize));
+}
+
+static int
+xencommize_grant_table_op(struct xencomm_mini **xc_area,
+			  unsigned int cmd, void *op, unsigned int count,
+			  struct xencomm_handle **desc)
+{
+	struct xencomm_handle *desc1;
+	unsigned int argsize;
+
+	switch (cmd) {
+	case GNTTABOP_map_grant_ref:
+		argsize = sizeof(struct gnttab_map_grant_ref);
+		break;
+	case GNTTABOP_unmap_grant_ref:
+		argsize = sizeof(struct gnttab_unmap_grant_ref);
+		break;
+	case GNTTABOP_setup_table:
+	{
+		struct gnttab_setup_table *setup = op;
+
+		argsize = sizeof(*setup);
+
+		if (count != 1)
+			return -EINVAL;
+		desc1 = __xencomm_map_no_alloc
+			(xen_guest_handle(setup->frame_list),
+			 setup->nr_frames *
+			 sizeof(*xen_guest_handle(setup->frame_list)),
+			 *xc_area);
+		if (desc1 == NULL)
+			return -EINVAL;
+		(*xc_area)++;
+		set_xen_guest_handle(setup->frame_list, (void *)desc1);
+		break;
+	}
+	case GNTTABOP_dump_table:
+		argsize = sizeof(struct gnttab_dump_table);
+		break;
+	case GNTTABOP_transfer:
+		argsize = sizeof(struct gnttab_transfer);
+		break;
+	case GNTTABOP_copy:
+		argsize = sizeof(struct gnttab_copy);
+		break;
+	case GNTTABOP_query_size:
+		argsize = sizeof(struct gnttab_query_size);
+		break;
+	default:
+		printk(KERN_DEBUG "%s: unknown hypercall grant table op %d\n",
+		       __func__, cmd);
+		BUG();
+	}
+
+	*desc = __xencomm_map_no_alloc(op, count * argsize, *xc_area);
+	if (*desc == NULL)
+		return -EINVAL;
+	(*xc_area)++;
+
+	return 0;
+}
+
+int
+xencomm_hypercall_grant_table_op(unsigned int cmd, void *op,
+				 unsigned int count)
+{
+	int rc;
+	struct xencomm_handle *desc;
+	XENCOMM_MINI_ALIGNED(xc_area, 2);
+
+	rc = xencommize_grant_table_op(&xc_area, cmd, op, count, &desc);
+	if (rc)
+		return rc;
+
+	return xencomm_arch_hypercall_grant_table_op(cmd, desc, count);
+}
+EXPORT_SYMBOL_GPL(xencomm_hypercall_grant_table_op);
+
+int
+xencomm_hypercall_sched_op(int cmd, void *arg)
+{
+	struct xencomm_handle *desc;
+	unsigned int argsize;
+
+	switch (cmd) {
+	case SCHEDOP_yield:
+	case SCHEDOP_block:
+		argsize = 0;
+		break;
+	case SCHEDOP_shutdown:
+		argsize = sizeof(struct sched_shutdown);
+		break;
+	case SCHEDOP_poll:
+	{
+		struct sched_poll *poll = arg;
+		struct xencomm_handle *ports;
+
+		argsize = sizeof(struct sched_poll);
+		ports = xencomm_map_no_alloc(xen_guest_handle(poll->ports),
+				     sizeof(*xen_guest_handle(poll->ports)));
+
+		set_xen_guest_handle(poll->ports, (void *)ports);
+		break;
+	}
+	default:
+		printk(KERN_DEBUG "%s: unknown sched op %d\n", __func__, cmd);
+		return -ENOSYS;
+	}
+
+	desc = xencomm_map_no_alloc(arg, argsize);
+	if (desc == NULL)
+		return -EINVAL;
+
+	return xencomm_arch_hypercall_sched_op(cmd, desc);
+}
+EXPORT_SYMBOL_GPL(xencomm_hypercall_sched_op);
+
+int
+xencomm_hypercall_multicall(void *call_list, int nr_calls)
+{
+	int rc;
+	int i;
+	struct multicall_entry *mce;
+	struct xencomm_handle *desc;
+	XENCOMM_MINI_ALIGNED(xc_area, nr_calls * 2);
+
+	for (i = 0; i < nr_calls; i++) {
+		mce = (struct multicall_entry *)call_list + i;
+
+		switch (mce->op) {
+		case __HYPERVISOR_update_va_mapping:
+		case __HYPERVISOR_mmu_update:
+			/* No-op on ia64.  */
+			break;
+		case __HYPERVISOR_grant_table_op:
+			rc = xencommize_grant_table_op
+				(&xc_area,
+				 mce->args[0], (void *)mce->args[1],
+				 mce->args[2], &desc);
+			if (rc)
+				return rc;
+			mce->args[1] = (unsigned long)desc;
+			break;
+		case __HYPERVISOR_memory_op:
+		default:
+			printk(KERN_DEBUG
+			       "%s: unhandled multicall op entry op %lu\n",
+			       __func__, mce->op);
+			return -ENOSYS;
+		}
+	}
+
+	desc = xencomm_map_no_alloc(call_list,
+				    nr_calls * sizeof(struct multicall_entry));
+	if (desc == NULL)
+		return -EINVAL;
+
+	return xencomm_arch_hypercall_multicall(desc, nr_calls);
+}
+EXPORT_SYMBOL_GPL(xencomm_hypercall_multicall);
+
+int
+xencomm_hypercall_callback_op(int cmd, void *arg)
+{
+	unsigned int argsize;
+	switch (cmd) {
+	case CALLBACKOP_register:
+		argsize = sizeof(struct callback_register);
+		break;
+	case CALLBACKOP_unregister:
+		argsize = sizeof(struct callback_unregister);
+		break;
+	default:
+		printk(KERN_DEBUG
+		       "%s: unknown callback op %d\n", __func__, cmd);
+		return -ENOSYS;
+	}
+
+	return xencomm_arch_hypercall_callback_op
+		(cmd, xencomm_map_no_alloc(arg, argsize));
+}
+
+static int
+xencommize_memory_reservation(struct xencomm_mini *xc_area,
+			      struct xen_memory_reservation *mop)
+{
+	struct xencomm_handle *desc;
+
+	desc = __xencomm_map_no_alloc(xen_guest_handle(mop->extent_start),
+			mop->nr_extents *
+			sizeof(*xen_guest_handle(mop->extent_start)),
+			xc_area);
+	if (desc == NULL)
+		return -EINVAL;
+
+	set_xen_guest_handle(mop->extent_start, (void *)desc);
+	return 0;
+}
+
+int
+xencomm_hypercall_memory_op(unsigned int cmd, void *arg)
+{
+	GUEST_HANDLE(xen_pfn_t) extent_start_va[2] = { {NULL}, {NULL} };
+	struct xen_memory_reservation *xmr = NULL;
+	int rc;
+	struct xencomm_handle *desc;
+	unsigned int argsize;
+	XENCOMM_MINI_ALIGNED(xc_area, 2);
+
+	switch (cmd) {
+	case XENMEM_increase_reservation:
+	case XENMEM_decrease_reservation:
+	case XENMEM_populate_physmap:
+		xmr = (struct xen_memory_reservation *)arg;
+		set_xen_guest_handle(extent_start_va[0],
+				     xen_guest_handle(xmr->extent_start));
+
+		argsize = sizeof(*xmr);
+		rc = xencommize_memory_reservation(xc_area, xmr);
+		if (rc)
+			return rc;
+		xc_area++;
+		break;
+
+	case XENMEM_maximum_ram_page:
+		argsize = 0;
+		break;
+
+	case XENMEM_add_to_physmap:
+		argsize = sizeof(struct xen_add_to_physmap);
+		break;
+
+	default:
+		printk(KERN_DEBUG "%s: unknown memory op %d\n", __func__, cmd);
+		return -ENOSYS;
+	}
+
+	desc = xencomm_map_no_alloc(arg, argsize);
+	if (desc == NULL)
+		return -EINVAL;
+
+	rc = xencomm_arch_hypercall_memory_op(cmd, desc);
+
+	switch (cmd) {
+	case XENMEM_increase_reservation:
+	case XENMEM_decrease_reservation:
+	case XENMEM_populate_physmap:
+		set_xen_guest_handle(xmr->extent_start,
+				     xen_guest_handle(extent_start_va[0]));
+		break;
+	}
+
+	return rc;
+}
+EXPORT_SYMBOL_GPL(xencomm_hypercall_memory_op);
+
+int
+xencomm_hypercall_suspend(unsigned long srec)
+{
+	struct sched_shutdown arg;
+
+	arg.reason = SHUTDOWN_suspend;
+
+	return xencomm_arch_hypercall_sched_op(
+		SCHEDOP_shutdown, xencomm_map_no_alloc(&arg, sizeof(arg)));
+}
+
+long
+xencomm_hypercall_vcpu_op(int cmd, int cpu, void *arg)
+{
+	unsigned int argsize;
+	switch (cmd) {
+	case VCPUOP_register_runstate_memory_area: {
+		struct vcpu_register_runstate_memory_area *area =
+			(struct vcpu_register_runstate_memory_area *)arg;
+		argsize = sizeof(*arg);
+		set_xen_guest_handle(area->addr.h,
+		     (void *)xencomm_map_no_alloc(area->addr.v,
+						  sizeof(area->addr.v)));
+		break;
+	}
+
+	default:
+		printk(KERN_DEBUG "%s: unknown vcpu op %d\n", __func__, cmd);
+		return -ENOSYS;
+	}
+
+	return xencomm_arch_hypercall_vcpu_op(cmd, cpu,
+					xencomm_map_no_alloc(arg, argsize));
+}
+
+long
+xencomm_hypercall_opt_feature(void *arg)
+{
+	return xencomm_arch_hypercall_opt_feature(
+		xencomm_map_no_alloc(arg,
+				     sizeof(struct xen_ia64_opt_feature)));
+}

arch/ia64/xen/xencomm.c

@@ -19,11 +19,22 @@
 #include <linux/mm.h>
 
 static unsigned long kernel_virtual_offset;
+static int is_xencomm_initialized;
+
+/* for xen early printk. It uses console io hypercall which uses xencomm.
+ * However early printk may use it before xencomm initialization.
+ */
+int
+xencomm_is_initialized(void)
+{
+	return is_xencomm_initialized;
+}
 
 void
 xencomm_initialize(void)
 {
 	kernel_virtual_offset = KERNEL_START - ia64_tpa(KERNEL_START);
+	is_xencomm_initialized = 1;
 }
 
 /* Translate virtual address to physical address.  */