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533 lines
14 KiB
533 lines
14 KiB
/****************************************************************************** |
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* hypercall.h |
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* |
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* Linux-specific hypervisor handling. |
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* |
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* Copyright (c) 2002-2004, K A Fraser |
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* |
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* This program is free software; you can redistribute it and/or |
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* modify it under the terms of the GNU General Public License version 2 |
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* as published by the Free Software Foundation; or, when distributed |
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* separately from the Linux kernel or incorporated into other |
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* software packages, subject to the following license: |
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* |
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* Permission is hereby granted, free of charge, to any person obtaining a copy |
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* of this source file (the "Software"), to deal in the Software without |
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* restriction, including without limitation the rights to use, copy, modify, |
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* merge, publish, distribute, sublicense, and/or sell copies of the Software, |
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* and to permit persons to whom the Software is furnished to do so, subject to |
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* the following conditions: |
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* |
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* The above copyright notice and this permission notice shall be included in |
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* all copies or substantial portions of the Software. |
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* |
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE |
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER |
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING |
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* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS |
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* IN THE SOFTWARE. |
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*/ |
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#ifndef _ASM_X86_XEN_HYPERCALL_H |
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#define _ASM_X86_XEN_HYPERCALL_H |
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#include <linux/kernel.h> |
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#include <linux/spinlock.h> |
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#include <linux/errno.h> |
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#include <linux/string.h> |
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#include <linux/types.h> |
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#include <linux/pgtable.h> |
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#include <trace/events/xen.h> |
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#include <asm/page.h> |
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#include <asm/smap.h> |
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#include <asm/nospec-branch.h> |
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#include <xen/interface/xen.h> |
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#include <xen/interface/sched.h> |
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#include <xen/interface/physdev.h> |
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#include <xen/interface/platform.h> |
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#include <xen/interface/xen-mca.h> |
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struct xen_dm_op_buf; |
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/* |
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* The hypercall asms have to meet several constraints: |
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* - Work on 32- and 64-bit. |
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* The two architectures put their arguments in different sets of |
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* registers. |
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* |
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* - Work around asm syntax quirks |
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* It isn't possible to specify one of the rNN registers in a |
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* constraint, so we use explicit register variables to get the |
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* args into the right place. |
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* |
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* - Mark all registers as potentially clobbered |
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* Even unused parameters can be clobbered by the hypervisor, so we |
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* need to make sure gcc knows it. |
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* |
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* - Avoid compiler bugs. |
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* This is the tricky part. Because x86_32 has such a constrained |
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* register set, gcc versions below 4.3 have trouble generating |
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* code when all the arg registers and memory are trashed by the |
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* asm. There are syntactically simpler ways of achieving the |
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* semantics below, but they cause the compiler to crash. |
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* |
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* The only combination I found which works is: |
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* - assign the __argX variables first |
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* - list all actually used parameters as "+r" (__argX) |
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* - clobber the rest |
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* |
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* The result certainly isn't pretty, and it really shows up cpp's |
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* weakness as a macro language. Sorry. (But let's just give thanks |
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* there aren't more than 5 arguments...) |
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*/ |
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extern struct { char _entry[32]; } hypercall_page[]; |
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#define __HYPERCALL "call hypercall_page+%c[offset]" |
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#define __HYPERCALL_ENTRY(x) \ |
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[offset] "i" (__HYPERVISOR_##x * sizeof(hypercall_page[0])) |
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#ifdef CONFIG_X86_32 |
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#define __HYPERCALL_RETREG "eax" |
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#define __HYPERCALL_ARG1REG "ebx" |
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#define __HYPERCALL_ARG2REG "ecx" |
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#define __HYPERCALL_ARG3REG "edx" |
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#define __HYPERCALL_ARG4REG "esi" |
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#define __HYPERCALL_ARG5REG "edi" |
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#else |
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#define __HYPERCALL_RETREG "rax" |
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#define __HYPERCALL_ARG1REG "rdi" |
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#define __HYPERCALL_ARG2REG "rsi" |
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#define __HYPERCALL_ARG3REG "rdx" |
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#define __HYPERCALL_ARG4REG "r10" |
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#define __HYPERCALL_ARG5REG "r8" |
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#endif |
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#define __HYPERCALL_DECLS \ |
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register unsigned long __res asm(__HYPERCALL_RETREG); \ |
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register unsigned long __arg1 asm(__HYPERCALL_ARG1REG) = __arg1; \ |
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register unsigned long __arg2 asm(__HYPERCALL_ARG2REG) = __arg2; \ |
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register unsigned long __arg3 asm(__HYPERCALL_ARG3REG) = __arg3; \ |
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register unsigned long __arg4 asm(__HYPERCALL_ARG4REG) = __arg4; \ |
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register unsigned long __arg5 asm(__HYPERCALL_ARG5REG) = __arg5; |
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#define __HYPERCALL_0PARAM "=r" (__res), ASM_CALL_CONSTRAINT |
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#define __HYPERCALL_1PARAM __HYPERCALL_0PARAM, "+r" (__arg1) |
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#define __HYPERCALL_2PARAM __HYPERCALL_1PARAM, "+r" (__arg2) |
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#define __HYPERCALL_3PARAM __HYPERCALL_2PARAM, "+r" (__arg3) |
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#define __HYPERCALL_4PARAM __HYPERCALL_3PARAM, "+r" (__arg4) |
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#define __HYPERCALL_5PARAM __HYPERCALL_4PARAM, "+r" (__arg5) |
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#define __HYPERCALL_0ARG() |
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#define __HYPERCALL_1ARG(a1) \ |
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__HYPERCALL_0ARG() __arg1 = (unsigned long)(a1); |
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#define __HYPERCALL_2ARG(a1,a2) \ |
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__HYPERCALL_1ARG(a1) __arg2 = (unsigned long)(a2); |
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#define __HYPERCALL_3ARG(a1,a2,a3) \ |
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__HYPERCALL_2ARG(a1,a2) __arg3 = (unsigned long)(a3); |
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#define __HYPERCALL_4ARG(a1,a2,a3,a4) \ |
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__HYPERCALL_3ARG(a1,a2,a3) __arg4 = (unsigned long)(a4); |
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#define __HYPERCALL_5ARG(a1,a2,a3,a4,a5) \ |
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__HYPERCALL_4ARG(a1,a2,a3,a4) __arg5 = (unsigned long)(a5); |
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#define __HYPERCALL_CLOBBER5 "memory" |
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#define __HYPERCALL_CLOBBER4 __HYPERCALL_CLOBBER5, __HYPERCALL_ARG5REG |
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#define __HYPERCALL_CLOBBER3 __HYPERCALL_CLOBBER4, __HYPERCALL_ARG4REG |
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#define __HYPERCALL_CLOBBER2 __HYPERCALL_CLOBBER3, __HYPERCALL_ARG3REG |
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#define __HYPERCALL_CLOBBER1 __HYPERCALL_CLOBBER2, __HYPERCALL_ARG2REG |
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#define __HYPERCALL_CLOBBER0 __HYPERCALL_CLOBBER1, __HYPERCALL_ARG1REG |
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#define _hypercall0(type, name) \ |
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({ \ |
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__HYPERCALL_DECLS; \ |
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__HYPERCALL_0ARG(); \ |
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asm volatile (__HYPERCALL \ |
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: __HYPERCALL_0PARAM \ |
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: __HYPERCALL_ENTRY(name) \ |
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: __HYPERCALL_CLOBBER0); \ |
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(type)__res; \ |
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}) |
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#define _hypercall1(type, name, a1) \ |
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({ \ |
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__HYPERCALL_DECLS; \ |
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__HYPERCALL_1ARG(a1); \ |
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asm volatile (__HYPERCALL \ |
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: __HYPERCALL_1PARAM \ |
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: __HYPERCALL_ENTRY(name) \ |
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: __HYPERCALL_CLOBBER1); \ |
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(type)__res; \ |
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}) |
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#define _hypercall2(type, name, a1, a2) \ |
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({ \ |
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__HYPERCALL_DECLS; \ |
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__HYPERCALL_2ARG(a1, a2); \ |
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asm volatile (__HYPERCALL \ |
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: __HYPERCALL_2PARAM \ |
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: __HYPERCALL_ENTRY(name) \ |
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: __HYPERCALL_CLOBBER2); \ |
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(type)__res; \ |
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}) |
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#define _hypercall3(type, name, a1, a2, a3) \ |
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({ \ |
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__HYPERCALL_DECLS; \ |
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__HYPERCALL_3ARG(a1, a2, a3); \ |
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asm volatile (__HYPERCALL \ |
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: __HYPERCALL_3PARAM \ |
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: __HYPERCALL_ENTRY(name) \ |
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: __HYPERCALL_CLOBBER3); \ |
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(type)__res; \ |
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}) |
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#define _hypercall4(type, name, a1, a2, a3, a4) \ |
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({ \ |
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__HYPERCALL_DECLS; \ |
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__HYPERCALL_4ARG(a1, a2, a3, a4); \ |
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asm volatile (__HYPERCALL \ |
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: __HYPERCALL_4PARAM \ |
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: __HYPERCALL_ENTRY(name) \ |
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: __HYPERCALL_CLOBBER4); \ |
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(type)__res; \ |
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}) |
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static inline long |
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xen_single_call(unsigned int call, |
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unsigned long a1, unsigned long a2, |
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unsigned long a3, unsigned long a4, |
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unsigned long a5) |
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{ |
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__HYPERCALL_DECLS; |
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__HYPERCALL_5ARG(a1, a2, a3, a4, a5); |
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if (call >= PAGE_SIZE / sizeof(hypercall_page[0])) |
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return -EINVAL; |
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asm volatile(CALL_NOSPEC |
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: __HYPERCALL_5PARAM |
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: [thunk_target] "a" (&hypercall_page[call]) |
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: __HYPERCALL_CLOBBER5); |
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return (long)__res; |
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} |
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static __always_inline void __xen_stac(void) |
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{ |
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/* |
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* Suppress objtool seeing the STAC/CLAC and getting confused about it |
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* calling random code with AC=1. |
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*/ |
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asm volatile(ANNOTATE_IGNORE_ALTERNATIVE |
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ASM_STAC ::: "memory", "flags"); |
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} |
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static __always_inline void __xen_clac(void) |
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{ |
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asm volatile(ANNOTATE_IGNORE_ALTERNATIVE |
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ASM_CLAC ::: "memory", "flags"); |
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} |
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static inline long |
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privcmd_call(unsigned int call, |
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unsigned long a1, unsigned long a2, |
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unsigned long a3, unsigned long a4, |
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unsigned long a5) |
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{ |
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long res; |
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__xen_stac(); |
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res = xen_single_call(call, a1, a2, a3, a4, a5); |
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__xen_clac(); |
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return res; |
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} |
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static inline int |
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HYPERVISOR_set_trap_table(struct trap_info *table) |
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{ |
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return _hypercall1(int, set_trap_table, table); |
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} |
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static inline int |
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HYPERVISOR_mmu_update(struct mmu_update *req, int count, |
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int *success_count, domid_t domid) |
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{ |
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return _hypercall4(int, mmu_update, req, count, success_count, domid); |
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} |
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static inline int |
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HYPERVISOR_mmuext_op(struct mmuext_op *op, int count, |
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int *success_count, domid_t domid) |
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{ |
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return _hypercall4(int, mmuext_op, op, count, success_count, domid); |
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} |
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static inline int |
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HYPERVISOR_set_gdt(unsigned long *frame_list, int entries) |
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{ |
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return _hypercall2(int, set_gdt, frame_list, entries); |
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} |
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static inline int |
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HYPERVISOR_callback_op(int cmd, void *arg) |
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{ |
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return _hypercall2(int, callback_op, cmd, arg); |
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} |
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static inline int |
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HYPERVISOR_sched_op(int cmd, void *arg) |
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{ |
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return _hypercall2(int, sched_op, cmd, arg); |
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} |
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static inline long |
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HYPERVISOR_set_timer_op(u64 timeout) |
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{ |
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unsigned long timeout_hi = (unsigned long)(timeout>>32); |
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unsigned long timeout_lo = (unsigned long)timeout; |
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return _hypercall2(long, set_timer_op, timeout_lo, timeout_hi); |
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} |
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static inline int |
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HYPERVISOR_mca(struct xen_mc *mc_op) |
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{ |
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mc_op->interface_version = XEN_MCA_INTERFACE_VERSION; |
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return _hypercall1(int, mca, mc_op); |
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} |
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static inline int |
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HYPERVISOR_platform_op(struct xen_platform_op *op) |
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{ |
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op->interface_version = XENPF_INTERFACE_VERSION; |
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return _hypercall1(int, platform_op, op); |
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} |
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static inline int |
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HYPERVISOR_set_debugreg(int reg, unsigned long value) |
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{ |
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return _hypercall2(int, set_debugreg, reg, value); |
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} |
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static inline unsigned long |
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HYPERVISOR_get_debugreg(int reg) |
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{ |
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return _hypercall1(unsigned long, get_debugreg, reg); |
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} |
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static inline int |
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HYPERVISOR_update_descriptor(u64 ma, u64 desc) |
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{ |
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if (sizeof(u64) == sizeof(long)) |
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return _hypercall2(int, update_descriptor, ma, desc); |
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return _hypercall4(int, update_descriptor, ma, ma>>32, desc, desc>>32); |
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} |
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static inline long |
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HYPERVISOR_memory_op(unsigned int cmd, void *arg) |
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{ |
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return _hypercall2(long, memory_op, cmd, arg); |
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} |
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static inline int |
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HYPERVISOR_multicall(void *call_list, uint32_t nr_calls) |
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{ |
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return _hypercall2(int, multicall, call_list, nr_calls); |
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} |
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static inline int |
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HYPERVISOR_update_va_mapping(unsigned long va, pte_t new_val, |
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unsigned long flags) |
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{ |
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if (sizeof(new_val) == sizeof(long)) |
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return _hypercall3(int, update_va_mapping, va, |
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new_val.pte, flags); |
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else |
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return _hypercall4(int, update_va_mapping, va, |
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new_val.pte, new_val.pte >> 32, flags); |
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} |
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static inline int |
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HYPERVISOR_event_channel_op(int cmd, void *arg) |
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{ |
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return _hypercall2(int, event_channel_op, cmd, arg); |
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} |
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static inline int |
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HYPERVISOR_xen_version(int cmd, void *arg) |
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{ |
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return _hypercall2(int, xen_version, cmd, arg); |
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} |
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static inline int |
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HYPERVISOR_console_io(int cmd, int count, char *str) |
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{ |
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return _hypercall3(int, console_io, cmd, count, str); |
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} |
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static inline int |
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HYPERVISOR_physdev_op(int cmd, void *arg) |
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{ |
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return _hypercall2(int, physdev_op, cmd, arg); |
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} |
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static inline int |
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HYPERVISOR_grant_table_op(unsigned int cmd, void *uop, unsigned int count) |
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{ |
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return _hypercall3(int, grant_table_op, cmd, uop, count); |
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} |
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static inline int |
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HYPERVISOR_vm_assist(unsigned int cmd, unsigned int type) |
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{ |
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return _hypercall2(int, vm_assist, cmd, type); |
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} |
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static inline int |
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HYPERVISOR_vcpu_op(int cmd, int vcpuid, void *extra_args) |
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{ |
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return _hypercall3(int, vcpu_op, cmd, vcpuid, extra_args); |
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} |
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#ifdef CONFIG_X86_64 |
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static inline int |
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HYPERVISOR_set_segment_base(int reg, unsigned long value) |
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{ |
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return _hypercall2(int, set_segment_base, reg, value); |
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} |
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#endif |
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static inline int |
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HYPERVISOR_suspend(unsigned long start_info_mfn) |
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{ |
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struct sched_shutdown r = { .reason = SHUTDOWN_suspend }; |
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/* |
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* For a PV guest the tools require that the start_info mfn be |
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* present in rdx/edx when the hypercall is made. Per the |
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* hypercall calling convention this is the third hypercall |
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* argument, which is start_info_mfn here. |
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*/ |
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return _hypercall3(int, sched_op, SCHEDOP_shutdown, &r, start_info_mfn); |
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} |
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static inline unsigned long __must_check |
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HYPERVISOR_hvm_op(int op, void *arg) |
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{ |
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return _hypercall2(unsigned long, hvm_op, op, arg); |
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} |
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static inline int |
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HYPERVISOR_tmem_op( |
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struct tmem_op *op) |
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{ |
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return _hypercall1(int, tmem_op, op); |
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} |
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static inline int |
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HYPERVISOR_xenpmu_op(unsigned int op, void *arg) |
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{ |
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return _hypercall2(int, xenpmu_op, op, arg); |
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} |
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static inline int |
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HYPERVISOR_dm_op( |
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domid_t dom, unsigned int nr_bufs, struct xen_dm_op_buf *bufs) |
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{ |
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int ret; |
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__xen_stac(); |
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ret = _hypercall3(int, dm_op, dom, nr_bufs, bufs); |
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__xen_clac(); |
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return ret; |
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} |
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static inline void |
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MULTI_fpu_taskswitch(struct multicall_entry *mcl, int set) |
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{ |
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mcl->op = __HYPERVISOR_fpu_taskswitch; |
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mcl->args[0] = set; |
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trace_xen_mc_entry(mcl, 1); |
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} |
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static inline void |
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MULTI_update_va_mapping(struct multicall_entry *mcl, unsigned long va, |
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pte_t new_val, unsigned long flags) |
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{ |
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mcl->op = __HYPERVISOR_update_va_mapping; |
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mcl->args[0] = va; |
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if (sizeof(new_val) == sizeof(long)) { |
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mcl->args[1] = new_val.pte; |
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mcl->args[2] = flags; |
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} else { |
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mcl->args[1] = new_val.pte; |
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mcl->args[2] = new_val.pte >> 32; |
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mcl->args[3] = flags; |
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} |
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trace_xen_mc_entry(mcl, sizeof(new_val) == sizeof(long) ? 3 : 4); |
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} |
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static inline void |
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MULTI_update_descriptor(struct multicall_entry *mcl, u64 maddr, |
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struct desc_struct desc) |
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{ |
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mcl->op = __HYPERVISOR_update_descriptor; |
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if (sizeof(maddr) == sizeof(long)) { |
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mcl->args[0] = maddr; |
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mcl->args[1] = *(unsigned long *)&desc; |
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} else { |
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u32 *p = (u32 *)&desc; |
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mcl->args[0] = maddr; |
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mcl->args[1] = maddr >> 32; |
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mcl->args[2] = *p++; |
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mcl->args[3] = *p; |
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} |
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trace_xen_mc_entry(mcl, sizeof(maddr) == sizeof(long) ? 2 : 4); |
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} |
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static inline void |
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MULTI_mmu_update(struct multicall_entry *mcl, struct mmu_update *req, |
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int count, int *success_count, domid_t domid) |
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{ |
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mcl->op = __HYPERVISOR_mmu_update; |
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mcl->args[0] = (unsigned long)req; |
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mcl->args[1] = count; |
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mcl->args[2] = (unsigned long)success_count; |
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mcl->args[3] = domid; |
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trace_xen_mc_entry(mcl, 4); |
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} |
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static inline void |
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MULTI_mmuext_op(struct multicall_entry *mcl, struct mmuext_op *op, int count, |
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int *success_count, domid_t domid) |
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{ |
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mcl->op = __HYPERVISOR_mmuext_op; |
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mcl->args[0] = (unsigned long)op; |
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mcl->args[1] = count; |
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mcl->args[2] = (unsigned long)success_count; |
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mcl->args[3] = domid; |
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trace_xen_mc_entry(mcl, 4); |
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} |
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static inline void |
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MULTI_stack_switch(struct multicall_entry *mcl, |
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unsigned long ss, unsigned long esp) |
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{ |
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mcl->op = __HYPERVISOR_stack_switch; |
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mcl->args[0] = ss; |
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mcl->args[1] = esp; |
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trace_xen_mc_entry(mcl, 2); |
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} |
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#endif /* _ASM_X86_XEN_HYPERCALL_H */
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