xen/x86: Update topology map for PV VCPUs

Early during boot topology_update_package_map() computes
logical_pkg_ids for all present processors.

Later, when processors are brought up, identify_cpu() updates
these values based on phys_pkg_id which is a function of
initial_apicid. On PV guests the latter may point to a
non-existing node, causing logical_pkg_ids to be set to -1.

Intel's RAPL uses logical_pkg_id (as topology_logical_package_id())
to index its arrays and therefore in this case will point to index
65535 (since logical_pkg_id is a u16). This could lead to either a
crash or may actually access random memory location.

As a workaround, we recompute topology during CPU bringup to reset
logical_pkg_id to a valid value.

(The reason for initial_apicid being bogus is because it is
initial_apicid of the processor from which the guest is launched.
This value is CPUID(1).EBX[31:24])

Signed-off-by: Boris Ostrovsky <[email protected]>
Cc: [email protected]
Signed-off-by: David Vrabel <[email protected]>

Author: Boris Ostrovsky

arch/x86/xen/smp.c

@@ -87,6 +87,12 @@ static void cpu_bringup(void)
 	cpu_data(cpu).x86_max_cores = 1;
 	set_cpu_sibling_map(cpu);
 
+	/*
+	 * identify_cpu() may have set logical_pkg_id to -1 due
+	 * to incorrect phys_proc_id. Let's re-comupte it.
+	 */
+	topology_update_package_map(apic->cpu_present_to_apicid(cpu), cpu);
+
 	xen_setup_cpu_clockevents();
 
 	notify_cpu_starting(cpu);