This is a note to let you know that I've just added the patch titled
x86/xen: Calculate __max_logical_packages on PV domains
to the 4.15-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git%3Ba=su...
The filename of the patch is: x86-xen-calculate-__max_logical_packages-on-pv-domains.patch and it can be found in the queue-4.15 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree, please let stable@vger.kernel.org know about it.
From 63e708f826bb21470155d37b103a75d8a9e25b18 Mon Sep 17 00:00:00 2001
From: Prarit Bhargava prarit@redhat.com Date: Wed, 7 Feb 2018 18:49:23 -0500 Subject: x86/xen: Calculate __max_logical_packages on PV domains
From: Prarit Bhargava prarit@redhat.com
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@redhat.com Tested-and-reported-by: Simon Gaiser simon@invisiblethingslab.com Cc: Thomas Gleixner tglx@linutronix.de Cc: Ingo Molnar mingo@redhat.com Cc: "H. Peter Anvin" hpa@zytor.com Cc: x86@kernel.org Cc: Boris Ostrovsky boris.ostrovsky@oracle.com Cc: Juergen Gross jgross@suse.com Cc: Dou Liyang douly.fnst@cn.fujitsu.com Cc: Prarit Bhargava prarit@redhat.com Cc: Kate Stewart kstewart@linuxfoundation.org Cc: Greg Kroah-Hartman gregkh@linuxfoundation.org Cc: Andy Lutomirski luto@kernel.org Cc: Andi Kleen ak@linux.intel.com Cc: Vitaly Kuznetsov vkuznets@redhat.com Cc: xen-devel@lists.xenproject.org Reviewed-by: Boris Ostrovsky boris.ostrovsky@oracle.com Signed-off-by: Juergen Gross jgross@suse.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org
--- 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;
Patches currently in stable-queue which might be from prarit@redhat.com are
queue-4.15/x86-xen-calculate-__max_logical_packages-on-pv-domains.patch