[Xen-devel] [PATCH] Fix network connectivity problem in dom0 on Yonah/Napa Platform

["Kay, Allen M" <allen.m.kay@xxxxxxxxx>]

The original code only calls io_apic_get_unique_id() for P4 or earlier processors by checking for CPU family < 15.  However, this check does not apply to Yonah family of processors whose CPU family value is 6.  This caused io_apic_get_unique_id() being called in Xen but not in Dom0 since the code in Dom0 has been ifdef’ed out.  The end result is IOAPIC ID mismatch between Xen and Dom0 - which caused IOAPIC not being programmed at all.  This patch generalizes earlier code by checking for LAPIC version number < 0x14 instead of CPU family - hence covers both P4 and new P6 family processors such as Yonah.

 

Signed-Off-By: Allen M. Kay <allen.m.kay@xxxxxxxxx>

 

diff -r 0807931dfa54 xen/arch/x86/mpparse.c

--- a/xen/arch/x86/mpparse.c    Fri Feb 24 15:37:09 2006

+++ b/xen/arch/x86/mpparse.c    Thu Mar  2 17:24:12 2006

@@ -935,7 +935,9 @@

        mp_ioapics[idx].mpc_apicaddr = address;

 

        set_fixmap_nocache(FIX_IO_APIC_BASE_0 + idx, address);

-       if ((boot_cpu_data.x86_vendor == X86_VENDOR_INTEL) && (boot_cpu_data.x86 < 15))

+       if ((boot_cpu_data.x86_vendor == X86_VENDOR_INTEL) &&

+               (GET_APIC_VERSION(apic_read(APIC_LVR)) < 0x14))

+

                mp_ioapics[idx].mpc_apicid = io_apic_get_unique_id(idx, id);

        else

                mp_ioapics[idx].mpc_apicid = id;

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