Messages in this thread Patch in this message | | | Subject | [PATCH v2] xen/apic: implement io apic read with hypercall | From | Lin Ming <> | Date | Tue, 01 May 2012 00:16:27 +0800 |
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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.
Signed-off-by: Lin Ming <mlin@ss.pku.edu.cn> ---
v2: fallback to return an emulated IO_APIC values if hypercall fails
arch/x86/xen/apic.c | 15 ++++++++++++++- 1 files changed, 14 insertions(+), 1 deletions(-)
diff --git a/arch/x86/xen/apic.c b/arch/x86/xen/apic.c index aee16ab..1913bf2 100644 --- a/arch/x86/xen/apic.c +++ b/arch/x86/xen/apic.c @@ -1,14 +1,27 @@ #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) return apic << 24; - return 0xff; + return 0xfd; } void __init xen_init_apic(void) -- 1.7.9
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