[Xen-devel] [PATCH 4.15 123/146] x86/xen: Calculate __max_logical_packages on PV domains

[Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>]

4.15-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Prarit Bhargava <prarit@xxxxxxxxxx>

commit 63e708f826bb21470155d37b103a75d8a9e25b18 upstream.

The kernel panics on PV domains because native_smp_cpus_done() is
only called for HVM domains.

Calculate __max_logical_packages for PV domains.

Fixes: b4c0a7326f5d ("x86/smpboot: Fix __max_logical_packages estimate")
Signed-off-by: Prarit Bhargava <prarit@xxxxxxxxxx>
Tested-and-reported-by: Simon Gaiser <simon@xxxxxxxxxxxxxxxxxxxxxx>
Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Cc: Ingo Molnar <mingo@xxxxxxxxxx>
Cc: "H. Peter Anvin" <hpa@xxxxxxxxx>
Cc: x86@xxxxxxxxxx
Cc: Boris Ostrovsky <boris.ostrovsky@xxxxxxxxxx>
Cc: Juergen Gross <jgross@xxxxxxxx>
Cc: Dou Liyang <douly.fnst@xxxxxxxxxxxxxx>
Cc: Prarit Bhargava <prarit@xxxxxxxxxx>
Cc: Kate Stewart <kstewart@xxxxxxxxxxxxxxxxxxx>
Cc: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
Cc: Andy Lutomirski <luto@xxxxxxxxxx>
Cc: Andi Kleen <ak@xxxxxxxxxxxxxxx>
Cc: Vitaly Kuznetsov <vkuznets@xxxxxxxxxx>
Cc: xen-devel@xxxxxxxxxxxxxxxxxxxx
Reviewed-by: Boris Ostrovsky <boris.ostrovsky@xxxxxxxxxx>
Signed-off-by: Juergen Gross <jgross@xxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>

---
 arch/x86/include/asm/smp.h |    1 +
 arch/x86/kernel/smpboot.c  |   10 ++++++++--
 arch/x86/xen/smp.c         |    2 ++
 3 files changed, 11 insertions(+), 2 deletions(-)

--- a/arch/x86/include/asm/smp.h
+++ b/arch/x86/include/asm/smp.h
@@ -129,6 +129,7 @@ static inline void arch_send_call_functi
 void cpu_disable_common(void);
 void native_smp_prepare_boot_cpu(void);
 void native_smp_prepare_cpus(unsigned int max_cpus);
+void calculate_max_logical_packages(void);
 void native_smp_cpus_done(unsigned int max_cpus);
 void common_cpu_up(unsigned int cpunum, struct task_struct *tidle);
 int native_cpu_up(unsigned int cpunum, struct task_struct *tidle);
--- a/arch/x86/kernel/smpboot.c
+++ b/arch/x86/kernel/smpboot.c
@@ -1282,11 +1282,10 @@ void __init native_smp_prepare_boot_cpu(
        cpu_set_state_online(me);
 }
 
-void __init native_smp_cpus_done(unsigned int max_cpus)
+void __init calculate_max_logical_packages(void)
 {
        int ncpus;
 
-       pr_debug("Boot done\n");
        /*
         * Today neither Intel nor AMD support heterogenous systems so
         * extrapolate the boot cpu's data to all packages.
@@ -1294,6 +1293,13 @@ void __init native_smp_cpus_done(unsigne
        ncpus = cpu_data(0).booted_cores * topology_max_smt_threads();
        __max_logical_packages = DIV_ROUND_UP(nr_cpu_ids, ncpus);
        pr_info("Max logical packages: %u\n", __max_logical_packages);
+}
+
+void __init native_smp_cpus_done(unsigned int max_cpus)
+{
+       pr_debug("Boot done\n");
+
+       calculate_max_logical_packages();
 
        if (x86_has_numa_in_package)
                set_sched_topology(x86_numa_in_package_topology);
--- a/arch/x86/xen/smp.c
+++ b/arch/x86/xen/smp.c
@@ -122,6 +122,8 @@ void __init xen_smp_cpus_done(unsigned i
 
        if (xen_hvm_domain())
                native_smp_cpus_done(max_cpus);
+       else
+               calculate_max_logical_packages();
 
        if (xen_have_vcpu_info_placement)
                return;



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