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    Subject[PATCH v9 02/18] x86/acrn: Introduce acrn_{setup, remove}_intr_handler()
    Date
    From: Shuo Liu <shuo.a.liu@intel.com>

    The ACRN Hypervisor builds an I/O request when a trapped I/O access
    happens in User VM. Then, ACRN Hypervisor issues an upcall by sending
    a notification interrupt to the Service VM. HSM in the Service VM needs
    to hook the notification interrupt to handle I/O requests.

    Notification interrupts from ACRN Hypervisor are already supported and
    a, currently uninitialized, callback called.

    Export two APIs for HSM to setup/remove its callback.

    Originally-by: Yakui Zhao <yakui.zhao@intel.com>
    Signed-off-by: Shuo Liu <shuo.a.liu@intel.com>
    Reviewed-by: Zhi Wang <zhi.a.wang@intel.com>
    Reviewed-by: Reinette Chatre <reinette.chatre@intel.com>
    Acked-by: Borislav Petkov <bp@suse.de>
    Cc: Dave Hansen <dave.hansen@intel.com>
    Cc: Sean Christopherson <sean.j.christopherson@intel.com>
    Cc: Dan Williams <dan.j.williams@intel.com>
    Cc: Fengwei Yin <fengwei.yin@intel.com>
    Cc: Zhi Wang <zhi.a.wang@intel.com>
    Cc: Zhenyu Wang <zhenyuw@linux.intel.com>
    Cc: Yu Wang <yu1.wang@intel.com>
    Cc: Reinette Chatre <reinette.chatre@intel.com>
    Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
    ---
    arch/x86/include/asm/acrn.h | 8 ++++++++
    arch/x86/kernel/cpu/acrn.c | 14 ++++++++++++++
    2 files changed, 22 insertions(+)
    create mode 100644 arch/x86/include/asm/acrn.h

    diff --git a/arch/x86/include/asm/acrn.h b/arch/x86/include/asm/acrn.h
    new file mode 100644
    index 000000000000..ff259b69cde7
    --- /dev/null
    +++ b/arch/x86/include/asm/acrn.h
    @@ -0,0 +1,8 @@
    +/* SPDX-License-Identifier: GPL-2.0 */
    +#ifndef _ASM_X86_ACRN_H
    +#define _ASM_X86_ACRN_H
    +
    +void acrn_setup_intr_handler(void (*handler)(void));
    +void acrn_remove_intr_handler(void);
    +
    +#endif /* _ASM_X86_ACRN_H */
    diff --git a/arch/x86/kernel/cpu/acrn.c b/arch/x86/kernel/cpu/acrn.c
    index 0b2c03943ac6..e0c181781905 100644
    --- a/arch/x86/kernel/cpu/acrn.c
    +++ b/arch/x86/kernel/cpu/acrn.c
    @@ -10,6 +10,8 @@
    */

    #include <linux/interrupt.h>
    +
    +#include <asm/acrn.h>
    #include <asm/apic.h>
    #include <asm/cpufeatures.h>
    #include <asm/desc.h>
    @@ -55,6 +57,18 @@ DEFINE_IDTENTRY_SYSVEC(sysvec_acrn_hv_callback)
    set_irq_regs(old_regs);
    }

    +void acrn_setup_intr_handler(void (*handler)(void))
    +{
    + acrn_intr_handler = handler;
    +}
    +EXPORT_SYMBOL_GPL(acrn_setup_intr_handler);
    +
    +void acrn_remove_intr_handler(void)
    +{
    + acrn_intr_handler = NULL;
    +}
    +EXPORT_SYMBOL_GPL(acrn_remove_intr_handler);
    +
    const __initconst struct hypervisor_x86 x86_hyper_acrn = {
    .name = "ACRN",
    .detect = acrn_detect,
    --
    2.28.0
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