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    Subject[PATCH 24 of 31] xen: add support for callbackops hypercall
    Date
    From
    Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>

    ---
    include/asm-x86/xen/hypercall.h | 6 ++
    include/asm-x86/xen/interface.h | 4 +
    include/xen/interface/callback.h | 102 ++++++++++++++++++++++++++++++++++++++
    3 files changed, 112 insertions(+)

    diff --git a/include/asm-x86/xen/hypercall.h b/include/asm-x86/xen/hypercall.h
    --- a/include/asm-x86/xen/hypercall.h
    +++ b/include/asm-x86/xen/hypercall.h
    @@ -161,6 +161,12 @@
    return _hypercall4(int, set_callbacks,
    event_selector, event_address,
    failsafe_selector, failsafe_address);
    +}
    +
    +static inline int
    +HYPERVISOR_callback_op(int cmd, void *arg)
    +{
    + return _hypercall2(int, callback_op, cmd, arg);
    }

    static inline int
    diff --git a/include/asm-x86/xen/interface.h b/include/asm-x86/xen/interface.h
    --- a/include/asm-x86/xen/interface.h
    +++ b/include/asm-x86/xen/interface.h
    @@ -171,6 +171,10 @@
    unsigned long pad[5]; /* sizeof(struct vcpu_info) == 64 */
    };

    +struct xen_callback {
    + unsigned long cs;
    + unsigned long eip;
    +};
    #endif /* !__ASSEMBLY__ */

    /*
    diff --git a/include/xen/interface/callback.h b/include/xen/interface/callback.h
    new file mode 100644
    --- /dev/null
    +++ b/include/xen/interface/callback.h
    @@ -0,0 +1,102 @@
    +/******************************************************************************
    + * callback.h
    + *
    + * Register guest OS callbacks with Xen.
    + *
    + * Permission is hereby granted, free of charge, to any person obtaining a copy
    + * of this software and associated documentation files (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.
    + *
    + * Copyright (c) 2006, Ian Campbell
    + */
    +
    +#ifndef __XEN_PUBLIC_CALLBACK_H__
    +#define __XEN_PUBLIC_CALLBACK_H__
    +
    +#include "xen.h"
    +
    +/*
    + * Prototype for this hypercall is:
    + * long callback_op(int cmd, void *extra_args)
    + * @cmd == CALLBACKOP_??? (callback operation).
    + * @extra_args == Operation-specific extra arguments (NULL if none).
    + */
    +
    +/* ia64, x86: Callback for event delivery. */
    +#define CALLBACKTYPE_event 0
    +
    +/* x86: Failsafe callback when guest state cannot be restored by Xen. */
    +#define CALLBACKTYPE_failsafe 1
    +
    +/* x86/64 hypervisor: Syscall by 64-bit guest app ('64-on-64-on-64'). */
    +#define CALLBACKTYPE_syscall 2
    +
    +/*
    + * x86/32 hypervisor: Only available on x86/32 when supervisor_mode_kernel
    + * feature is enabled. Do not use this callback type in new code.
    + */
    +#define CALLBACKTYPE_sysenter_deprecated 3
    +
    +/* x86: Callback for NMI delivery. */
    +#define CALLBACKTYPE_nmi 4
    +
    +/*
    + * x86: sysenter is only available as follows:
    + * - 32-bit hypervisor: with the supervisor_mode_kernel feature enabled
    + * - 64-bit hypervisor: 32-bit guest applications on Intel CPUs
    + * ('32-on-32-on-64', '32-on-64-on-64')
    + * [nb. also 64-bit guest applications on Intel CPUs
    + * ('64-on-64-on-64'), but syscall is preferred]
    + */
    +#define CALLBACKTYPE_sysenter 5
    +
    +/*
    + * x86/64 hypervisor: Syscall by 32-bit guest app on AMD CPUs
    + * ('32-on-32-on-64', '32-on-64-on-64')
    + */
    +#define CALLBACKTYPE_syscall32 7
    +
    +/*
    + * Disable event deliver during callback? This flag is ignored for event and
    + * NMI callbacks: event delivery is unconditionally disabled.
    + */
    +#define _CALLBACKF_mask_events 0
    +#define CALLBACKF_mask_events (1U << _CALLBACKF_mask_events)
    +
    +/*
    + * Register a callback.
    + */
    +#define CALLBACKOP_register 0
    +struct callback_register {
    + uint16_t type;
    + uint16_t flags;
    + struct xen_callback address;
    +};
    +
    +/*
    + * Unregister a callback.
    + *
    + * Not all callbacks can be unregistered. -EINVAL will be returned if
    + * you attempt to unregister such a callback.
    + */
    +#define CALLBACKOP_unregister 1
    +struct callback_unregister {
    + uint16_t type;
    + uint16_t _unused;
    +};
    +
    +#endif /* __XEN_PUBLIC_CALLBACK_H__ */



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