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| author | Jan Beulich <JBeulich@suse.com> | 2017-12-08 12:17:28 +0100 |
|---|---|---|
| committer | Boris Ostrovsky <boris.ostrovsky@oracle.com> | 2017-12-12 15:39:17 +0100 |
| commit | 0f3922a9b99eca76c6578cd84191573378f2c988 (patch) | |
| tree | ee9df16f009c9866d998f42b435b29f92cfdda2c /arch | |
| parent | xen/pvcalls: Fix a check in pvcalls_front_remove() (diff) | |
| download | linux-0f3922a9b99eca76c6578cd84191573378f2c988.tar.xz linux-0f3922a9b99eca76c6578cd84191573378f2c988.zip | |
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 <jbeulich@suse.com>
Reviewed-by: Juergen Gross <jgross@suse.com>
Signed-off-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/x86/xen/apic.c | 2 |
1 files changed, 1 insertions, 1 deletions
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()); |