From 0f3922a9b99eca76c6578cd84191573378f2c988 Mon Sep 17 00:00:00 2001 From: Jan Beulich Date: Fri, 8 Dec 2017 04:17:28 -0700 Subject: x86/Xen: don't report ancient LAPIC version 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 Reviewed-by: Juergen Gross Signed-off-by: Boris Ostrovsky --- arch/x86/xen/apic.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) (limited to 'arch') diff --git a/arch/x86/xen/apic.c b/arch/x86/xen/apic.c index b5e48da7fbff..c14048553c18 100644 --- a/arch/x86/xen/apic.c +++ b/arch/x86/xen/apic.c @@ -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()); -- cgit v1.2.3