4.4-stable review patch. If anyone has any objections, please let me know.
------------------
From: Juergen Gross jgross@suse.com
commit 74899d92e66663dc7671a8017b3146dcd4735f3b upstream.
Commit:
1f50ddb4f418 ("x86/speculation: Handle HT correctly on AMD")
... added speculative_store_bypass_ht_init() to the per-CPU initialization sequence.
speculative_store_bypass_ht_init() needs to be called on each CPU for PV guests, too.
Reported-by: Brian Woods brian.woods@amd.com Tested-by: Brian Woods brian.woods@amd.com Signed-off-by: Juergen Gross jgross@suse.com Cc: stable@vger.kernel.org Cc: Linus Torvalds torvalds@linux-foundation.org Cc: Peter Zijlstra peterz@infradead.org Cc: Thomas Gleixner tglx@linutronix.de Cc: boris.ostrovsky@oracle.com Cc: xen-devel@lists.xenproject.org Fixes: 1f50ddb4f4189243c05926b842dc1a0332195f31 ("x86/speculation: Handle HT correctly on AMD") Link: https://lore.kernel.org/lkml/20180621084331.21228-1-jgross@suse.com Signed-off-by: Ingo Molnar mingo@kernel.org Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org Signed-off-by: Srivatsa S. Bhat srivatsa@csail.mit.edu Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- arch/x86/xen/smp.c | 5 +++++ 1 file changed, 5 insertions(+)
--- a/arch/x86/xen/smp.c +++ b/arch/x86/xen/smp.c @@ -28,6 +28,7 @@ #include <xen/interface/vcpu.h> #include <xen/interface/xenpmu.h>
+#include <asm/spec-ctrl.h> #include <asm/xen/interface.h> #include <asm/xen/hypercall.h>
@@ -87,6 +88,8 @@ static void cpu_bringup(void) cpu_data(cpu).x86_max_cores = 1; set_cpu_sibling_map(cpu);
+ speculative_store_bypass_ht_init(); + xen_setup_cpu_clockevents();
notify_cpu_starting(cpu); @@ -357,6 +360,8 @@ static void __init xen_smp_prepare_cpus( } set_cpu_sibling_map(0);
+ speculative_store_bypass_ht_init(); + xen_pmu_init(0);
if (xen_smp_intr_init(0))