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Subject[PATCH] 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.

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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