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xen/apic: implement io apic read with hypercall

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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>
This commit is contained in:
Lin Ming
2012-05-01 00:16:27 +08:00
committed by Konrad Rzeszutek Wilk
parent 27abd14bd9
commit ab6ec39a19
1 changed files with 13 additions and 0 deletions
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13
arch/x86/xen/apic.c
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@ -1,8 +1,21 @@
#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)
{
struct physdev_apic apic_op;
int ret;
apic_op.apic_physbase = mpc_ioapic_addr(apic);
apic_op.reg = reg;
ret = HYPERVISOR_physdev_op(PHYSDEVOP_apic_read, &apic_op);
if (!ret)
return apic_op.value;
/* fallback to return an emulated IO_APIC values */
if (reg == 0x1)
return 0x00170020;
else if (reg == 0x0)