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xen/apic: implement io apic read with hypercall
Implements xen_io_apic_read with hypercall, so it returns proper IO-APIC information instead of fabricated one. Fallback to return an emulated IO_APIC values if hypercall fails. [v2: fallback to return an emulated IO_APIC values if hypercall fails] Signed-off-by: Lin Ming <mlin@ss.pku.edu.cn> Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
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#include <linux/init.h>
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#include <asm/x86_init.h>
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#include <asm/apic.h>
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#include <xen/interface/physdev.h>
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#include <asm/xen/hypercall.h>
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unsigned int xen_io_apic_read(unsigned apic, unsigned reg)
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{
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struct physdev_apic apic_op;
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int ret;
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apic_op.apic_physbase = mpc_ioapic_addr(apic);
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apic_op.reg = reg;
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ret = HYPERVISOR_physdev_op(PHYSDEVOP_apic_read, &apic_op);
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if (!ret)
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return apic_op.value;
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/* fallback to return an emulated IO_APIC values */
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if (reg == 0x1)
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return 0x00170020;
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else if (reg == 0x0)
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