/****************************************************************************** * 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/kernel.h> #include <linux/spinlock.h> #include <linux/errno.h> #include <linux/string.h> #include <linux/types.h> #include <linux/pgtable.h> #include <trace/events/xen.h> #include <asm/page.h> #include <asm/smap.h> #include <asm/nospec-branch.h> #include <xen/interface/xen.h> #include <xen/interface/sched.h> #include <xen/interface/physdev.h> #include <xen/interface/platform.h> #include <xen/interface/xen-mca.h> struct xen_dm_op_buf; /* * 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 a macro language. Sorry. (But let's just give thanks * there aren't more than 5 arguments...) */ extern struct { … } hypercall_page[]; #define __HYPERCALL … #define __HYPERCALL_ENTRY(x) … #ifdef CONFIG_X86_32 #define __HYPERCALL_RETREG … #define __HYPERCALL_ARG1REG … #define __HYPERCALL_ARG2REG … #define __HYPERCALL_ARG3REG … #define __HYPERCALL_ARG4REG … #define __HYPERCALL_ARG5REG … #else #define __HYPERCALL_RETREG … #define __HYPERCALL_ARG1REG … #define __HYPERCALL_ARG2REG … #define __HYPERCALL_ARG3REG … #define __HYPERCALL_ARG4REG … #define __HYPERCALL_ARG5REG … #endif #define __HYPERCALL_DECLS … #define __HYPERCALL_0PARAM … #define __HYPERCALL_1PARAM … #define __HYPERCALL_2PARAM … #define __HYPERCALL_3PARAM … #define __HYPERCALL_4PARAM … #define __HYPERCALL_5PARAM … #define __HYPERCALL_0ARG() … #define __HYPERCALL_1ARG(a1) … #define __HYPERCALL_2ARG(a1,a2) … #define __HYPERCALL_3ARG(a1,a2,a3) … #define __HYPERCALL_4ARG(a1,a2,a3,a4) … #define __HYPERCALL_5ARG(a1,a2,a3,a4,a5) … #define __HYPERCALL_CLOBBER5 … #define __HYPERCALL_CLOBBER4 … #define __HYPERCALL_CLOBBER3 … #define __HYPERCALL_CLOBBER2 … #define __HYPERCALL_CLOBBER1 … #define __HYPERCALL_CLOBBER0 … #define _hypercall0(type, name) … #define _hypercall1(type, name, a1) … #define _hypercall2(type, name, a1, a2) … #define _hypercall3(type, name, a1, a2, a3) … #define _hypercall4(type, name, a1, a2, a3, a4) … static inline long xen_single_call(unsigned int call, unsigned long a1, unsigned long a2, unsigned long a3, unsigned long a4, unsigned long a5) { … } static __always_inline void __xen_stac(void) { … } static __always_inline void __xen_clac(void) { … } static inline long privcmd_call(unsigned int call, unsigned long a1, unsigned long a2, unsigned long a3, unsigned long a4, unsigned long a5) { … } #ifdef CONFIG_XEN_PV static inline int HYPERVISOR_set_trap_table(struct trap_info *table) { … } static inline int HYPERVISOR_mmu_update(struct mmu_update *req, int count, int *success_count, domid_t domid) { … } static inline int HYPERVISOR_mmuext_op(struct mmuext_op *op, int count, int *success_count, domid_t domid) { … } static inline int HYPERVISOR_set_gdt(unsigned long *frame_list, int entries) { … } static inline int HYPERVISOR_callback_op(int cmd, void *arg) { … } static __always_inline int HYPERVISOR_set_debugreg(int reg, unsigned long value) { … } static __always_inline unsigned long HYPERVISOR_get_debugreg(int reg) { … } static inline int HYPERVISOR_update_descriptor(u64 ma, u64 desc) { … } static inline int HYPERVISOR_update_va_mapping(unsigned long va, pte_t new_val, unsigned long flags) { … } static inline int HYPERVISOR_set_segment_base(int reg, unsigned long value) { … } static inline void MULTI_fpu_taskswitch(struct multicall_entry *mcl, int set) { … } static inline void MULTI_update_va_mapping(struct multicall_entry *mcl, unsigned long va, pte_t new_val, unsigned long flags) { … } static inline void MULTI_update_descriptor(struct multicall_entry *mcl, u64 maddr, struct desc_struct desc) { … } static inline void MULTI_mmu_update(struct multicall_entry *mcl, struct mmu_update *req, int count, int *success_count, domid_t domid) { … } static inline void MULTI_mmuext_op(struct multicall_entry *mcl, struct mmuext_op *op, int count, int *success_count, domid_t domid) { … } static inline void MULTI_stack_switch(struct multicall_entry *mcl, unsigned long ss, unsigned long esp) { … } #endif static __always_inline int HYPERVISOR_sched_op(int cmd, void *arg) { … } static inline long HYPERVISOR_set_timer_op(u64 timeout) { … } static inline int HYPERVISOR_mca(struct xen_mc *mc_op) { … } static inline int HYPERVISOR_platform_op(struct xen_platform_op *op) { … } static inline long HYPERVISOR_memory_op(unsigned int cmd, void *arg) { … } static inline int HYPERVISOR_multicall(void *call_list, uint32_t nr_calls) { … } static inline int HYPERVISOR_event_channel_op(int cmd, void *arg) { … } static __always_inline int HYPERVISOR_xen_version(int cmd, void *arg) { … } static inline int HYPERVISOR_console_io(int cmd, int count, char *str) { … } static inline int HYPERVISOR_physdev_op(int cmd, void *arg) { … } static inline int HYPERVISOR_grant_table_op(unsigned int cmd, void *uop, unsigned int count) { … } static inline int HYPERVISOR_vm_assist(unsigned int cmd, unsigned int type) { … } static inline int HYPERVISOR_vcpu_op(int cmd, int vcpuid, void *extra_args) { … } static inline int HYPERVISOR_suspend(unsigned long start_info_mfn) { … } static inline unsigned long __must_check HYPERVISOR_hvm_op(int op, void *arg) { … } static inline int HYPERVISOR_xenpmu_op(unsigned int op, void *arg) { … } static inline int HYPERVISOR_dm_op( domid_t dom, unsigned int nr_bufs, struct xen_dm_op_buf *bufs) { … } #endif /* _ASM_X86_XEN_HYPERCALL_H */
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