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    Subject[PATCH] xen/apic: implement io apic read with hypercall
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    Date
    Implements xen_io_apic_read with hypercall, so it returns proper IO-APIC
    information instead of fabricated one.

    Signed-off-by: Lin Ming <mlin@ss.pku.edu.cn>
    ---
    arch/x86/xen/apic.c | 16 +++++++++++-----
    1 files changed, 11 insertions(+), 5 deletions(-)

    diff --git a/arch/x86/xen/apic.c b/arch/x86/xen/apic.c
    index aee16ab..f1f392d 100644
    --- a/arch/x86/xen/apic.c
    +++ b/arch/x86/xen/apic.c
    @@ -1,14 +1,20 @@
    #include <linux/init.h>
    #include <asm/x86_init.h>
    +#include <asm/apic.h>
    +#include <xen/interface/physdev.h>
    +#include <asm/xen/hypercall.h>

    unsigned int xen_io_apic_read(unsigned apic, unsigned reg)
    {
    - if (reg == 0x1)
    - return 0x00170020;
    - else if (reg == 0x0)
    - return apic << 24;
    + struct physdev_apic apic_op;
    + int ret;

    - return 0xff;
    + apic_op.apic_physbase = mpc_ioapic_addr(apic);
    + apic_op.reg = reg;
    + ret = HYPERVISOR_physdev_op(PHYSDEVOP_apic_read, &apic_op);
    + if (ret)
    + return ret;
    + return apic_op.value;
    }

    void __init xen_init_apic(void)
    --
    1.7.2.5




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