cregit-Linux how code gets into the kernel

Release 4.14 arch/x86/include/asm/xen/hypercall.h

/******************************************************************************
 * 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; }

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static inline int HYPERVISOR_set_trap_table(struct trap_info *table) { return _hypercall1(int, set_trap_table, table); }

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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); }

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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); }

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static inline int HYPERVISOR_set_gdt(unsigned long *frame_list, int entries) { return _hypercall2(int, set_gdt, frame_list, entries); }

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static inline int HYPERVISOR_stack_switch(unsigned long ss, unsigned long esp) { return _hypercall2(int, stack_switch, ss, esp); }

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#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); }

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#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); }

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#endif /* CONFIG_X86_{32,64} */
static inline int HYPERVISOR_callback_op(int cmd, void *arg) { return _hypercall2(int, callback_op, cmd, arg); }

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static inline int HYPERVISOR_fpu_taskswitch(int set) { return _hypercall1(int, fpu_taskswitch, set); }

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static inline int HYPERVISOR_sched_op(int cmd, void *arg) { return _hypercall2(int, sched_op, cmd, arg); }

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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); }

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static inline int HYPERVISOR_mca(struct xen_mc *mc_op) { mc_op->interface_version = XEN_MCA_INTERFACE_VERSION; return _hypercall1(int, mca, mc_op); }

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static inline int HYPERVISOR_platform_op(struct xen_platform_op *op) { op->interface_version = XENPF_INTERFACE_VERSION; return _hypercall1(int, platform_op, op); }

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static inline int HYPERVISOR_set_debugreg(int reg, unsigned long value) { return _hypercall2(int, set_debugreg, reg, value); }

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static inline unsigned long HYPERVISOR_get_debugreg(int reg) { return _hypercall1(unsigned long, get_debugreg, reg); }

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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); }

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static inline long HYPERVISOR_memory_op(unsigned int cmd, void *arg) { return _hypercall2(long, memory_op, cmd, arg); }

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static inline int HYPERVISOR_multicall(void *call_list, uint32_t nr_calls) { return _hypercall2(int, multicall, call_list, nr_calls); }

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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); }

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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; }

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static inline int HYPERVISOR_xen_version(int cmd, void *arg) { return _hypercall2(int, xen_version, cmd, arg); }

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static inline int HYPERVISOR_console_io(int cmd, int count, char *str) { return _hypercall3(int, console_io, cmd, count, str); }

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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; }

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static inline int HYPERVISOR_grant_table_op(unsigned int cmd, void *uop, unsigned int count) { return _hypercall3(int, grant_table_op, cmd, uop, count); }

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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); }

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static inline int HYPERVISOR_vm_assist(unsigned int cmd, unsigned int type) { return _hypercall2(int, vm_assist, cmd, type); }

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static inline int HYPERVISOR_vcpu_op(int cmd, int vcpuid, void *extra_args) { return _hypercall3(int, vcpu_op, cmd, vcpuid, extra_args); }

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#ifdef CONFIG_X86_64
static inline int HYPERVISOR_set_segment_base(int reg, unsigned long value) { return _hypercall2(int, set_segment_base, reg, value); }

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#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); }

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static inline int HYPERVISOR_nmi_op(unsigned long op, unsigned long arg) { return _hypercall2(int, nmi_op, op, arg); }

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static inline unsigned long __must_check HYPERVISOR_hvm_op(int op, void *arg) { return _hypercall2(unsigned long, hvm_op, op, arg); }

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static inline int HYPERVISOR_tmem_op( struct tmem_op *op) { return _hypercall1(int, tmem_op, op); }

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static inline int HYPERVISOR_xenpmu_op(unsigned int op, void *arg) { return _hypercall2(int, xenpmu_op, op, arg); }

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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; }

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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); }

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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); }

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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); }

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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); }

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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); }

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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); }

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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); }

Contributors

PersonTokensPropCommitsCommitProp
Jeremy Fitzhardinge84100.00%2100.00%
Total84100.00%2100.00%


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); }

Contributors

PersonTokensPropCommitsCommitProp
Jeremy Fitzhardinge84100.00%2100.00%
Total84100.00%2100.00%


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); }

Contributors

PersonTokensPropCommitsCommitProp
Jeremy Fitzhardinge55100.00%2100.00%
Total55100.00%2100.00%


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); }

Contributors

PersonTokensPropCommitsCommitProp
Jeremy Fitzhardinge51100.00%2100.00%
Total51100.00%2100.00%

#endif /* _ASM_X86_XEN_HYPERCALL_H */

Overall Contributors

PersonTokensPropCommitsCommitProp
Jeremy Fitzhardinge218289.13%1442.42%
Jan Beulich502.04%39.09%
Eduardo Pereira Habkost311.27%13.03%
Liu Jinsong311.27%13.03%
Paul Durrant301.23%13.03%
Boris Ostrovsky271.10%13.03%
Marek Marczykowski-Górecki230.94%13.03%
Dan Magenheimer220.90%13.03%
Ian Campbell190.78%39.09%
Colin Ian King110.45%13.03%
Sergey Dyasli50.20%13.03%
Stefano Stabellini50.20%13.03%
Thomas Gleixner50.20%13.03%
H. Peter Anvin30.12%13.03%
Josh Poimboeuf20.08%13.03%
Juergen Gross20.08%13.03%
Total2448100.00%33100.00%
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