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x86/Xen: don't report ancient LAPIC version

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Unconditionally reporting a value seen on the P4 or older invokes
functionality like io_apic_get_unique_id() on 32-bit builds, resulting
in a panic() with sufficiently many CPUs and/or IO-APICs. Doing what
that function does would be the hypervisor's responsibility anyway, so
makes no sense to be used when running on Xen. Uniformly report a more
modern version; this shouldn't matter much as both LAPIC and IO-APIC are
being managed entirely / mostly by the hypervisor.

Signed-off-by: Jan Beulich <jbeulich@suse.com>
Reviewed-by: Juergen Gross <jgross@suse.com>
Signed-off-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>
This commit is contained in:
Jan Beulich 2017-12-08 04:17:28 -07:00 committed by Boris Ostrovsky
parent 1ab134ca31
commit 0f3922a9b9
1 changed files with 1 additions and 1 deletions
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2
arch/x86/xen/apic.c
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@ -56,7 +56,7 @@ static u32 xen_apic_read(u32 reg)
return 0;
if (reg == APIC_LVR)
return 0x10;
return 0x14;
#ifdef CONFIG_X86_32
if (reg == APIC_LDR)
return SET_APIC_LOGICAL_ID(1UL << smp_processor_id());