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    Subject[PATCH v2 3/4] Drivers: hv: vmbus: Add hooks for per-CPU IRQ
    Date
    From: Michael Kelley <mikelley@microsoft.com>

    Add hooks to enable/disable a per-CPU IRQ for VMbus. These hooks
    are in the architecture independent setup and shutdown paths for
    Hyper-V, and are needed by Linux guests on Hyper-V on ARM64. The
    x86/x64 implementation is null because VMbus interrupts on x86/x64
    don't use an IRQ.

    Signed-off-by: Michael Kelley <mikelley@microsoft.com>
    Reviewed-by: James Morris <jmorris@namei.org>
    ---
    arch/x86/include/asm/mshyperv.h | 4 ++++
    drivers/hv/hv.c | 2 ++
    2 files changed, 6 insertions(+)

    diff --git a/arch/x86/include/asm/mshyperv.h b/arch/x86/include/asm/mshyperv.h
    index f377044..44ba554 100644
    --- a/arch/x86/include/asm/mshyperv.h
    +++ b/arch/x86/include/asm/mshyperv.h
    @@ -109,6 +109,10 @@ static inline void vmbus_signal_eom(struct hv_message *msg, u32 old_msg_type)
    void hv_setup_vmbus_irq(void (*handler)(void));
    void hv_remove_vmbus_irq(void);

    +/* On x86/x64, there isn't a real IRQ to be enabled/disable */
    +static inline void hv_enable_vmbus_irq(void) {}
    +static inline void hv_disable_vmbus_irq(void) {}
    +
    void hv_setup_kexec_handler(void (*handler)(void));
    void hv_remove_kexec_handler(void);
    void hv_setup_crash_handler(void (*handler)(struct pt_regs *regs));
    diff --git a/drivers/hv/hv.c b/drivers/hv/hv.c
    index 748a1c41..f8d1245 100644
    --- a/drivers/hv/hv.c
    +++ b/drivers/hv/hv.c
    @@ -300,6 +300,7 @@ int hv_synic_init(unsigned int cpu)
    hv_set_siefp(siefp.as_uint64);

    /* Setup the shared SINT. */
    + hv_enable_vmbus_irq();
    hv_get_synint_state(VMBUS_MESSAGE_SINT, shared_sint.as_uint64);

    shared_sint.vector = HYPERVISOR_CALLBACK_VECTOR;
    @@ -429,6 +430,7 @@ int hv_synic_cleanup(unsigned int cpu)
    hv_get_synic_state(sctrl.as_uint64);
    sctrl.enable = 0;
    hv_set_synic_state(sctrl.as_uint64);
    + hv_disable_vmbus_irq();

    return 0;
    }
    --
    1.8.3.1
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