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| author | Boris Ostrovsky | 2016-03-17 09:03:24 -0400 |
|---|---|---|
| committer | Konrad Rzeszutek Wilk | 2016-03-25 11:42:53 -0400 |
| commit | ed6069be7204541c1da532ad8bbf892e34513552 (patch) | |
| tree | 4d302ece1e1da9ce17bc9f322cc91916cd3787da /arch/x86/kvm/lapic.c | |
| parent | e01dc539df3ada9061a1097224513236b5381349 (diff) | |
xen/apic: Provide Xen-specific version of cpu_present_to_apicid APIC op
Currently Xen uses default_cpu_present_to_apicid() which will always
report BAD_APICID for PV guests since x86_bios_cpu_apic_id is initialised
to that value and is never updated.
With commit 1f12e32f4cd5 ("x86/topology: Create logical package id"), this
op is now called by smp_init_package_map() when deciding whether to call
topology_update_package_map() which sets cpu_data(cpu).logical_proc_id.
The latter (as topology_logical_package_id(cpu)) may be used, for example,
by cpu_to_rapl_pmu() as an array index. Since uninitialized
logical_package_id is set to -1, the index will become 64K which is
obviously problematic.
While RAPL code (and any other users of logical_package_id) should be
careful in their assumptions about id's validity, Xen's
cpu_present_to_apicid op should still provide value consistent with its
own xen_apic_read(APIC_ID).
Signed-off-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Diffstat (limited to 'arch/x86/kvm/lapic.c')
0 files changed, 0 insertions, 0 deletions