| /****************************************************************************** |
| * 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 <trace/events/xen.h> |
| |
| #include <asm/page.h> |
| #include <asm/pgtable.h> |
| #include <asm/smap.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 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), ASM_CALL_CONSTRAINT |
| #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 long |
| privcmd_call(unsigned call, |
| unsigned long a1, unsigned long a2, |
| unsigned long a3, unsigned long a4, |
| unsigned long a5) |
| { |
| __HYPERCALL_DECLS; |
| __HYPERCALL_5ARG(a1, a2, a3, a4, a5); |
| |
| stac(); |
| asm volatile("call *%[call]" |
| : __HYPERCALL_5PARAM |
| : [call] "a" (&hypercall_page[call]) |
| : __HYPERCALL_CLOBBER5); |
| clac(); |
| |
| return (long)__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, 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_mca(struct xen_mc *mc_op) |
| { |
| mc_op->interface_version = XEN_MCA_INTERFACE_VERSION; |
| return _hypercall1(int, mca, mc_op); |
| } |
| |
| static inline int |
| HYPERVISOR_platform_op(struct xen_platform_op *op) |
| { |
| op->interface_version = XENPF_INTERFACE_VERSION; |
| return _hypercall1(int, platform_op, op); |
| } |
| |
| 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) |
| { |
| if (sizeof(u64) == sizeof(long)) |
| return _hypercall2(int, update_descriptor, ma, desc); |
| return _hypercall4(int, update_descriptor, ma, ma>>32, desc, desc>>32); |
| } |
| |
| static inline long |
| HYPERVISOR_memory_op(unsigned int cmd, void *arg) |
| { |
| return _hypercall2(long, memory_op, cmd, arg); |
| } |
| |
| static inline int |
| HYPERVISOR_multicall(void *call_list, uint32_t 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); |
| } |
| extern int __must_check xen_event_channel_op_compat(int, void *); |
| |
| static inline int |
| HYPERVISOR_event_channel_op(int cmd, void *arg) |
| { |
| int rc = _hypercall2(int, event_channel_op, cmd, arg); |
| if (unlikely(rc == -ENOSYS)) |
| rc = xen_event_channel_op_compat(cmd, arg); |
| 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); |
| } |
| |
| extern int __must_check xen_physdev_op_compat(int, void *); |
| |
| static inline int |
| HYPERVISOR_physdev_op(int cmd, void *arg) |
| { |
| int rc = _hypercall2(int, physdev_op, cmd, arg); |
| if (unlikely(rc == -ENOSYS)) |
| rc = xen_physdev_op_compat(cmd, arg); |
| 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 start_info_mfn) |
| { |
| struct sched_shutdown r = { .reason = SHUTDOWN_suspend }; |
| |
| /* |
| * For a PV guest the tools require that the start_info mfn be |
| * present in rdx/edx when the hypercall is made. Per the |
| * hypercall calling convention this is the third hypercall |
| * argument, which is start_info_mfn here. |
| */ |
| return _hypercall3(int, sched_op, SCHEDOP_shutdown, &r, start_info_mfn); |
| } |
| |
| static inline int |
| HYPERVISOR_nmi_op(unsigned long op, unsigned long arg) |
| { |
| return _hypercall2(int, nmi_op, op, arg); |
| } |
| |
| static inline unsigned long __must_check |
| HYPERVISOR_hvm_op(int op, void *arg) |
| { |
| return _hypercall2(unsigned long, hvm_op, op, arg); |
| } |
| |
| static inline int |
| HYPERVISOR_tmem_op( |
| struct tmem_op *op) |
| { |
| return _hypercall1(int, tmem_op, op); |
| } |
| |
| static inline int |
| HYPERVISOR_xenpmu_op(unsigned int op, void *arg) |
| { |
| return _hypercall2(int, xenpmu_op, op, arg); |
| } |
| |
| static inline int |
| HYPERVISOR_dm_op( |
| domid_t dom, unsigned int nr_bufs, struct xen_dm_op_buf *bufs) |
| { |
| int ret; |
| stac(); |
| ret = _hypercall3(int, dm_op, dom, nr_bufs, bufs); |
| clac(); |
| return ret; |
| } |
| |
| static inline void |
| MULTI_fpu_taskswitch(struct multicall_entry *mcl, int set) |
| { |
| mcl->op = __HYPERVISOR_fpu_taskswitch; |
| mcl->args[0] = set; |
| |
| trace_xen_mc_entry(mcl, 1); |
| } |
| |
| 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; |
| } |
| |
| trace_xen_mc_entry(mcl, sizeof(new_val) == sizeof(long) ? 3 : 4); |
| } |
| |
| 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; |
| |
| trace_xen_mc_entry(mcl, 3); |
| } |
| |
| 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; |
| } |
| |
| trace_xen_mc_entry(mcl, sizeof(new_val) == sizeof(long) ? 4 : 5); |
| } |
| |
| 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 { |
| u32 *p = (u32 *)&desc; |
| |
| mcl->args[0] = maddr; |
| mcl->args[1] = maddr >> 32; |
| mcl->args[2] = *p++; |
| mcl->args[3] = *p; |
| } |
| |
| trace_xen_mc_entry(mcl, sizeof(maddr) == sizeof(long) ? 2 : 4); |
| } |
| |
| 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; |
| |
| trace_xen_mc_entry(mcl, 2); |
| } |
| |
| 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; |
| |
| trace_xen_mc_entry(mcl, 4); |
| } |
| |
| 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; |
| |
| trace_xen_mc_entry(mcl, 4); |
| } |
| |
| 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; |
| |
| trace_xen_mc_entry(mcl, 2); |
| } |
| |
| 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; |
| |
| trace_xen_mc_entry(mcl, 2); |
| } |
| |
| #endif /* _ASM_X86_XEN_HYPERCALL_H */ |