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    Subject[PATCH v3 2/3] x86/apic: Add helper function to get maximum physical APIC ID
    Date
    Export the max_physical_apicid via a helper function since this information
    is required by AMD SVM AVIC support.

    Signed-off-by: Suravee Suthikulpanit <suravee.suthikulpanit@amd.com>
    ---
    arch/x86/include/asm/apic.h | 1 +
    arch/x86/kernel/apic/apic.c | 6 ++++++
    2 files changed, 7 insertions(+)

    diff --git a/arch/x86/include/asm/apic.h b/arch/x86/include/asm/apic.h
    index 48067af94678..77d9cb2a7e28 100644
    --- a/arch/x86/include/asm/apic.h
    +++ b/arch/x86/include/asm/apic.h
    @@ -435,6 +435,7 @@ static inline void apic_set_eoi_write(void (*eoi_write)(u32 reg, u32 v)) {}
    #endif /* CONFIG_X86_LOCAL_APIC */

    extern void apic_ack_irq(struct irq_data *data);
    +extern u32 apic_get_max_phys_apicid(void);

    static inline void ack_APIC_irq(void)
    {
    diff --git a/arch/x86/kernel/apic/apic.c b/arch/x86/kernel/apic/apic.c
    index b70344bf6600..47653d8c05f2 100644
    --- a/arch/x86/kernel/apic/apic.c
    +++ b/arch/x86/kernel/apic/apic.c
    @@ -2361,6 +2361,12 @@ bool apic_id_is_primary_thread(unsigned int apicid)
    }
    #endif

    +u32 apic_get_max_phys_apicid(void)
    +{
    + return max_physical_apicid;
    +}
    +EXPORT_SYMBOL_GPL(apic_get_max_phys_apicid);
    +
    /*
    * Should use this API to allocate logical CPU IDs to keep nr_logical_cpuids
    * and cpuid_to_apicid[] synchronized.
    --
    2.25.1
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