1 files changed, 527 insertions, 0 deletions

diff --git a/arch/x86/include/asm/xen/hypercall.h b/arch/x86/include/asm/xen/hypercall.h
new file mode 100644
index 00000000000..44f4259bee3
--- /dev/null
+++ b/arch/x86/include/asm/xen/hypercall.h
@@ -0,0 +1,527 @@
+/******************************************************************************
+ * hypercall.h
+ *
+ * Linux-specific hypervisor handling.
+ *
+ * Copyright (c) 2002-2004, K A Fraser
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License version 2
+ * as published by the Free Software Foundation; or, when distributed
+ * separately from the Linux kernel or incorporated into other
+ * software packages, subject to the following license:
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this source file (the "Software"), to deal in the Software without
+ * restriction, including without limitation the rights to use, copy, modify,
+ * merge, publish, distribute, sublicense, and/or sell copies of the Software,
+ * and to permit persons to whom the Software is furnished to do so, subject to
+ * the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
+ * IN THE SOFTWARE.
+ */
+
+#ifndef ASM_X86__XEN__HYPERCALL_H
+#define ASM_X86__XEN__HYPERCALL_H
+
+#include <linux/errno.h>
+#include <linux/string.h>
+
+#include <xen/interface/xen.h>
+#include <xen/interface/sched.h>
+#include <xen/interface/physdev.h>
+
+/*
+ * The hypercall asms have to meet several constraints:
+ * - Work on 32- and 64-bit.
+ *    The two architectures put their arguments in different sets of
+ *    registers.
+ *
+ * - Work around asm syntax quirks
+ *    It isn't possible to specify one of the rNN registers in a
+ *    constraint, so we use explicit register variables to get the
+ *    args into the right place.
+ *
+ * - Mark all registers as potentially clobbered
+ *    Even unused parameters can be clobbered by the hypervisor, so we
+ *    need to make sure gcc knows it.
+ *
+ * - Avoid compiler bugs.
+ *    This is the tricky part.  Because x86_32 has such a constrained
+ *    register set, gcc versions below 4.3 have trouble generating
+ *    code when all the arg registers and memory are trashed by the
+ *    asm.  There are syntactically simpler ways of achieving the
+ *    semantics below, but they cause the compiler to crash.
+ *
+ *    The only combination I found which works is:
+ *     - assign the __argX variables first
+ *     - list all actually used parameters as "+r" (__argX)
+ *     - clobber the rest
+ *
+ * The result certainly isn't pretty, and it really shows up cpp's
+ * weakness as as macro language.  Sorry.  (But let's just give thanks
+ * there aren't more than 5 arguments...)
+ */
+
+extern struct { char _entry[32]; } hypercall_page[];
+
+#define __HYPERCALL             "call hypercall_page+%c[offset]"
+#define __HYPERCALL_ENTRY(x)                                            \
+        [offset] "i" (__HYPERVISOR_##x * sizeof(hypercall_page[0]))
+
+#ifdef CONFIG_X86_32
+#define __HYPERCALL_RETREG      "eax"
+#define __HYPERCALL_ARG1REG     "ebx"
+#define __HYPERCALL_ARG2REG     "ecx"
+#define __HYPERCALL_ARG3REG     "edx"
+#define __HYPERCALL_ARG4REG     "esi"
+#define __HYPERCALL_ARG5REG     "edi"
+#else
+#define __HYPERCALL_RETREG      "rax"
+#define __HYPERCALL_ARG1REG     "rdi"
+#define __HYPERCALL_ARG2REG     "rsi"
+#define __HYPERCALL_ARG3REG     "rdx"
+#define __HYPERCALL_ARG4REG     "r10"
+#define __HYPERCALL_ARG5REG     "r8"
+#endif
+
+#define __HYPERCALL_DECLS                                               \
+        register unsigned long __res  asm(__HYPERCALL_RETREG);          \
+        register unsigned long __arg1 asm(__HYPERCALL_ARG1REG) = __arg1; \
+        register unsigned long __arg2 asm(__HYPERCALL_ARG2REG) = __arg2; \
+        register unsigned long __arg3 asm(__HYPERCALL_ARG3REG) = __arg3; \
+        register unsigned long __arg4 asm(__HYPERCALL_ARG4REG) = __arg4; \
+        register unsigned long __arg5 asm(__HYPERCALL_ARG5REG) = __arg5;
+
+#define __HYPERCALL_0PARAM      "=r" (__res)
+#define __HYPERCALL_1PARAM      __HYPERCALL_0PARAM, "+r" (__arg1)
+#define __HYPERCALL_2PARAM      __HYPERCALL_1PARAM, "+r" (__arg2)
+#define __HYPERCALL_3PARAM      __HYPERCALL_2PARAM, "+r" (__arg3)
+#define __HYPERCALL_4PARAM      __HYPERCALL_3PARAM, "+r" (__arg4)
+#define __HYPERCALL_5PARAM      __HYPERCALL_4PARAM, "+r" (__arg5)
+
+#define __HYPERCALL_0ARG()
+#define __HYPERCALL_1ARG(a1)                                            \
+        __HYPERCALL_0ARG()              __arg1 = (unsigned long)(a1);
+#define __HYPERCALL_2ARG(a1,a2)                                         \
+        __HYPERCALL_1ARG(a1)            __arg2 = (unsigned long)(a2);
+#define __HYPERCALL_3ARG(a1,a2,a3)                                      \
+        __HYPERCALL_2ARG(a1,a2)         __arg3 = (unsigned long)(a3);
+#define __HYPERCALL_4ARG(a1,a2,a3,a4)                                   \
+        __HYPERCALL_3ARG(a1,a2,a3)      __arg4 = (unsigned long)(a4);
+#define __HYPERCALL_5ARG(a1,a2,a3,a4,a5)                                \
+        __HYPERCALL_4ARG(a1,a2,a3,a4)   __arg5 = (unsigned long)(a5);
+
+#define __HYPERCALL_CLOBBER5    "memory"
+#define __HYPERCALL_CLOBBER4    __HYPERCALL_CLOBBER5, __HYPERCALL_ARG5REG
+#define __HYPERCALL_CLOBBER3    __HYPERCALL_CLOBBER4, __HYPERCALL_ARG4REG
+#define __HYPERCALL_CLOBBER2    __HYPERCALL_CLOBBER3, __HYPERCALL_ARG3REG
+#define __HYPERCALL_CLOBBER1    __HYPERCALL_CLOBBER2, __HYPERCALL_ARG2REG
+#define __HYPERCALL_CLOBBER0    __HYPERCALL_CLOBBER1, __HYPERCALL_ARG1REG
+
+#define _hypercall0(type, name)                                         \
+({                                                                      \
+        __HYPERCALL_DECLS;                                              \
+        __HYPERCALL_0ARG();                                             \
+        asm volatile (__HYPERCALL                                       \
+                      : __HYPERCALL_0PARAM                              \
+                      : __HYPERCALL_ENTRY(name)                         \
+                      : __HYPERCALL_CLOBBER0);                          \
+        (type)__res;                                                    \
+})
+
+#define _hypercall1(type, name, a1)                                     \
+({                                                                      \
+        __HYPERCALL_DECLS;                                              \
+        __HYPERCALL_1ARG(a1);                                           \
+        asm volatile (__HYPERCALL                                       \
+                      : __HYPERCALL_1PARAM                              \
+                      : __HYPERCALL_ENTRY(name)                         \
+                      : __HYPERCALL_CLOBBER1);                          \
+        (type)__res;                                                    \
+})
+
+#define _hypercall2(type, name, a1, a2)                                 \
+({                                                                      \
+        __HYPERCALL_DECLS;                                              \
+        __HYPERCALL_2ARG(a1, a2);                                       \
+        asm volatile (__HYPERCALL                                       \
+                      : __HYPERCALL_2PARAM                              \
+                      : __HYPERCALL_ENTRY(name)                         \
+                      : __HYPERCALL_CLOBBER2);                          \
+        (type)__res;                                                    \
+})
+
+#define _hypercall3(type, name, a1, a2, a3)                             \
+({                                                                      \
+        __HYPERCALL_DECLS;                                              \
+        __HYPERCALL_3ARG(a1, a2, a3);                                   \
+        asm volatile (__HYPERCALL                                       \
+                      : __HYPERCALL_3PARAM                              \
+                      : __HYPERCALL_ENTRY(name)                         \
+                      : __HYPERCALL_CLOBBER3);                          \
+        (type)__res;                                                    \
+})
+
+#define _hypercall4(type, name, a1, a2, a3, a4)                         \
+({                                                                      \
+        __HYPERCALL_DECLS;                                              \
+        __HYPERCALL_4ARG(a1, a2, a3, a4);                               \
+        asm volatile (__HYPERCALL                                       \
+                      : __HYPERCALL_4PARAM                              \
+                      : __HYPERCALL_ENTRY(name)                         \
+                      : __HYPERCALL_CLOBBER4);                          \
+        (type)__res;                                                    \
+})
+
+#define _hypercall5(type, name, a1, a2, a3, a4, a5)                     \
+({                                                                      \
+        __HYPERCALL_DECLS;                                              \
+        __HYPERCALL_5ARG(a1, a2, a3, a4, a5);                           \
+        asm volatile (__HYPERCALL                                       \
+                      : __HYPERCALL_5PARAM                              \
+                      : __HYPERCALL_ENTRY(name)                         \
+                      : __HYPERCALL_CLOBBER5);                          \
+        (type)__res;                                                    \
+})
+
+static inline int
+HYPERVISOR_set_trap_table(struct trap_info *table)
+{
+        return _hypercall1(int, set_trap_table, table);
+}
+
+static inline int
+HYPERVISOR_mmu_update(struct mmu_update *req, int count,
+                      int *success_count, domid_t domid)
+{
+        return _hypercall4(int, mmu_update, req, count, success_count, domid);
+}
+
+static inline int
+HYPERVISOR_mmuext_op(struct mmuext_op *op, int count,
+                     int *success_count, domid_t domid)
+{
+        return _hypercall4(int, mmuext_op, op, count, success_count, domid);
+}
+
+static inline int
+HYPERVISOR_set_gdt(unsigned long *frame_list, int entries)
+{
+        return _hypercall2(int, set_gdt, frame_list, entries);
+}
+
+static inline int
+HYPERVISOR_stack_switch(unsigned long ss, unsigned long esp)
+{
+        return _hypercall2(int, stack_switch, ss, esp);
+}
+
+#ifdef CONFIG_X86_32
+static inline int
+HYPERVISOR_set_callbacks(unsigned long event_selector,
+                         unsigned long event_address,
+                         unsigned long failsafe_selector,
+                         unsigned long failsafe_address)
+{
+        return _hypercall4(int, set_callbacks,
+                           event_selector, event_address,
+                           failsafe_selector, failsafe_address);
+}
+#else  /* CONFIG_X86_64 */
+static inline int
+HYPERVISOR_set_callbacks(unsigned long event_address,
+                        unsigned long failsafe_address,
+                        unsigned long syscall_address)
+{
+        return _hypercall3(int, set_callbacks,
+                           event_address, failsafe_address,
+                           syscall_address);
+}
+#endif  /* CONFIG_X86_{32,64} */
+
+static inline int
+HYPERVISOR_callback_op(int cmd, void *arg)
+{
+        return _hypercall2(int, callback_op, cmd, arg);
+}
+
+static inline int
+HYPERVISOR_fpu_taskswitch(int set)
+{
+        return _hypercall1(int, fpu_taskswitch, set);
+}
+
+static inline int
+HYPERVISOR_sched_op(int cmd, void *arg)
+{
+        return _hypercall2(int, sched_op_new, cmd, arg);
+}
+
+static inline long
+HYPERVISOR_set_timer_op(u64 timeout)
+{
+        unsigned long timeout_hi = (unsigned long)(timeout>>32);
+        unsigned long timeout_lo = (unsigned long)timeout;
+        return _hypercall2(long, set_timer_op, timeout_lo, timeout_hi);
+}
+
+static inline int
+HYPERVISOR_set_debugreg(int reg, unsigned long value)
+{
+        return _hypercall2(int, set_debugreg, reg, value);
+}
+
+static inline unsigned long
+HYPERVISOR_get_debugreg(int reg)
+{
+        return _hypercall1(unsigned long, get_debugreg, reg);
+}
+
+static inline int
+HYPERVISOR_update_descriptor(u64 ma, u64 desc)
+{
+        return _hypercall4(int, update_descriptor, ma, ma>>32, desc, desc>>32);
+}
+
+static inline int
+HYPERVISOR_memory_op(unsigned int cmd, void *arg)
+{
+        return _hypercall2(int, memory_op, cmd, arg);
+}
+
+static inline int
+HYPERVISOR_multicall(void *call_list, int nr_calls)
+{
+        return _hypercall2(int, multicall, call_list, nr_calls);
+}
+
+static inline int
+HYPERVISOR_update_va_mapping(unsigned long va, pte_t new_val,
+                             unsigned long flags)
+{
+        if (sizeof(new_val) == sizeof(long))
+                return _hypercall3(int, update_va_mapping, va,
+                                   new_val.pte, flags);
+        else
+                return _hypercall4(int, update_va_mapping, va,
+                                   new_val.pte, new_val.pte >> 32, flags);
+}
+
+static inline int
+HYPERVISOR_event_channel_op(int cmd, void *arg)
+{
+        int rc = _hypercall2(int, event_channel_op, cmd, arg);
+        if (unlikely(rc == -ENOSYS)) {
+                struct evtchn_op op;
+                op.cmd = cmd;
+                memcpy(&op.u, arg, sizeof(op.u));
+                rc = _hypercall1(int, event_channel_op_compat, &op);
+                memcpy(arg, &op.u, sizeof(op.u));
+        }
+        return rc;
+}
+
+static inline int
+HYPERVISOR_xen_version(int cmd, void *arg)
+{
+        return _hypercall2(int, xen_version, cmd, arg);
+}
+
+static inline int
+HYPERVISOR_console_io(int cmd, int count, char *str)
+{
+        return _hypercall3(int, console_io, cmd, count, str);
+}
+
+static inline int
+HYPERVISOR_physdev_op(int cmd, void *arg)
+{
+        int rc = _hypercall2(int, physdev_op, cmd, arg);
+        if (unlikely(rc == -ENOSYS)) {
+                struct physdev_op op;
+                op.cmd = cmd;
+                memcpy(&op.u, arg, sizeof(op.u));
+                rc = _hypercall1(int, physdev_op_compat, &op);
+                memcpy(arg, &op.u, sizeof(op.u));
+        }
+        return rc;
+}
+
+static inline int
+HYPERVISOR_grant_table_op(unsigned int cmd, void *uop, unsigned int count)
+{
+        return _hypercall3(int, grant_table_op, cmd, uop, count);
+}
+
+static inline int
+HYPERVISOR_update_va_mapping_otherdomain(unsigned long va, pte_t new_val,
+                                         unsigned long flags, domid_t domid)
+{
+        if (sizeof(new_val) == sizeof(long))
+                return _hypercall4(int, update_va_mapping_otherdomain, va,
+                                   new_val.pte, flags, domid);
+        else
+                return _hypercall5(int, update_va_mapping_otherdomain, va,
+                                   new_val.pte, new_val.pte >> 32,
+                                   flags, domid);
+}
+
+static inline int
+HYPERVISOR_vm_assist(unsigned int cmd, unsigned int type)
+{
+        return _hypercall2(int, vm_assist, cmd, type);
+}
+
+static inline int
+HYPERVISOR_vcpu_op(int cmd, int vcpuid, void *extra_args)
+{
+        return _hypercall3(int, vcpu_op, cmd, vcpuid, extra_args);
+}
+
+#ifdef CONFIG_X86_64
+static inline int
+HYPERVISOR_set_segment_base(int reg, unsigned long value)
+{
+        return _hypercall2(int, set_segment_base, reg, value);
+}
+#endif
+
+static inline int
+HYPERVISOR_suspend(unsigned long srec)
+{
+        return _hypercall3(int, sched_op, SCHEDOP_shutdown,
+                           SHUTDOWN_suspend, srec);
+}
+
+static inline int
+HYPERVISOR_nmi_op(unsigned long op, unsigned long arg)
+{
+        return _hypercall2(int, nmi_op, op, arg);
+}
+
+static inline void
+MULTI_fpu_taskswitch(struct multicall_entry *mcl, int set)
+{
+        mcl->op = __HYPERVISOR_fpu_taskswitch;
+        mcl->args[0] = set;
+}
+
+static inline void
+MULTI_update_va_mapping(struct multicall_entry *mcl, unsigned long va,
+                        pte_t new_val, unsigned long flags)
+{
+        mcl->op = __HYPERVISOR_update_va_mapping;
+        mcl->args[0] = va;
+        if (sizeof(new_val) == sizeof(long)) {
+                mcl->args[1] = new_val.pte;
+                mcl->args[2] = flags;
+        } else {
+                mcl->args[1] = new_val.pte;
+                mcl->args[2] = new_val.pte >> 32;
+                mcl->args[3] = flags;
+        }
+}
+
+static inline void
+MULTI_grant_table_op(struct multicall_entry *mcl, unsigned int cmd,
+                     void *uop, unsigned int count)
+{
+        mcl->op = __HYPERVISOR_grant_table_op;
+        mcl->args[0] = cmd;
+        mcl->args[1] = (unsigned long)uop;
+        mcl->args[2] = count;
+}
+
+static inline void
+MULTI_update_va_mapping_otherdomain(struct multicall_entry *mcl, unsigned long va,
+                                    pte_t new_val, unsigned long flags,
+                                    domid_t domid)
+{
+        mcl->op = __HYPERVISOR_update_va_mapping_otherdomain;
+        mcl->args[0] = va;
+        if (sizeof(new_val) == sizeof(long)) {
+                mcl->args[1] = new_val.pte;
+                mcl->args[2] = flags;
+                mcl->args[3] = domid;
+        } else {
+                mcl->args[1] = new_val.pte;
+                mcl->args[2] = new_val.pte >> 32;
+                mcl->args[3] = flags;
+                mcl->args[4] = domid;
+        }
+}
+
+static inline void
+MULTI_update_descriptor(struct multicall_entry *mcl, u64 maddr,
+                        struct desc_struct desc)
+{
+        mcl->op = __HYPERVISOR_update_descriptor;
+        if (sizeof(maddr) == sizeof(long)) {
+                mcl->args[0] = maddr;
+                mcl->args[1] = *(unsigned long *)&desc;
+        } else {
+                mcl->args[0] = maddr;
+                mcl->args[1] = maddr >> 32;
+                mcl->args[2] = desc.a;
+                mcl->args[3] = desc.b;
+        }
+}
+
+static inline void
+MULTI_memory_op(struct multicall_entry *mcl, unsigned int cmd, void *arg)
+{
+        mcl->op = __HYPERVISOR_memory_op;
+        mcl->args[0] = cmd;
+        mcl->args[1] = (unsigned long)arg;
+}
+
+static inline void
+MULTI_mmu_update(struct multicall_entry *mcl, struct mmu_update *req,
+                 int count, int *success_count, domid_t domid)
+{
+        mcl->op = __HYPERVISOR_mmu_update;
+        mcl->args[0] = (unsigned long)req;
+        mcl->args[1] = count;
+        mcl->args[2] = (unsigned long)success_count;
+        mcl->args[3] = domid;
+}
+
+static inline void
+MULTI_mmuext_op(struct multicall_entry *mcl, struct mmuext_op *op, int count,
+                int *success_count, domid_t domid)
+{
+        mcl->op = __HYPERVISOR_mmuext_op;
+        mcl->args[0] = (unsigned long)op;
+        mcl->args[1] = count;
+        mcl->args[2] = (unsigned long)success_count;
+        mcl->args[3] = domid;
+}
+
+static inline void
+MULTI_set_gdt(struct multicall_entry *mcl, unsigned long *frames, int entries)
+{
+        mcl->op = __HYPERVISOR_set_gdt;
+        mcl->args[0] = (unsigned long)frames;
+        mcl->args[1] = entries;
+}
+
+static inline void
+MULTI_stack_switch(struct multicall_entry *mcl,
+                   unsigned long ss, unsigned long esp)
+{
+        mcl->op = __HYPERVISOR_stack_switch;
+        mcl->args[0] = ss;
+        mcl->args[1] = esp;
+}
+
+#endif /* ASM_X86__XEN__HYPERCALL_H */