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Re: [Xen-devel] Workings/effectiveness of the xen-acpi-processor driver



On 05/02/2012 12:08 PM, Konrad Rzeszutek Wilk wrote:
diff --git a/arch/x86/xen/enlighten.c b/arch/x86/xen/enlighten.c
index a8f8844..d816448 100644
--- a/arch/x86/xen/enlighten.c
+++ b/arch/x86/xen/enlighten.c
@@ -811,7 +811,29 @@ static void xen_io_delay(void)
  #ifdef CONFIG_X86_LOCAL_APIC
  static u32 xen_apic_read(u32 reg)
  {
-       return 0;
+       struct xen_platform_op op = {
+               .cmd = XENPF_get_cpuinfo,
+               .interface_version = XENPF_INTERFACE_VERSION,
+               .u.pcpu_info.xen_cpuid = 0,


Is this always zero? This will probably solve the current problem but I am wondering whether in the future we might hit another bug because this routine will return the same APICID for all VCPUs.

-boris


+       };
+       int ret = 0;
+
+       /* Shouldn't need this as APIC is turned off for PV, and we only
+        * get called on the bootup processor. But just in case. */
+       if (!xen_initial_domain() || smp_processor_id())
+               return 0;
+
+       if (reg == APIC_LVR)
+               return 0x10;
+
+       if (reg != APIC_ID)
+               return 0;
+
+       ret = HYPERVISOR_dom0_op(&op);
+       if (ret)
+               return 0;
+
+       return op.u.pcpu_info.apic_id;
  }

  static void xen_apic_write(u32 reg, u32 val)




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