x86/xen: Add call of speculative_store_bypass_ht_init() to PV paths

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: 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>
[bwh: Backported to 3.16: adjust filename, context]
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>

diff --git a/arch/x86/xen/smp.c b/arch/x86/xen/smp.c
index 7005974c3ff308a2504def1cb035d393ed82693f..baa1d038c864783869158b85dcfedca73c1b3097 100644 (file)
--- a/arch/x86/xen/smp.c
+++ b/arch/x86/xen/smp.c
@@ -27,6 +27,7 @@
 #include <xen/interface/xen.h>
 #include <xen/interface/vcpu.h>
 
+#include <asm/spec-ctrl.h>
 #include <asm/xen/interface.h>
 #include <asm/xen/hypercall.h>
 
@@ -83,6 +84,8 @@ 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);
@@ -334,6 +337,8 @@ static void __init xen_smp_prepare_cpus(unsigned int max_cpus)
        }
        set_cpu_sibling_map(0);
 
+       speculative_store_bypass_ht_init();
+
        if (xen_smp_intr_init(0))
                BUG();