[Xen-devel] [PATCH] x86/xen: add call of speculative_store_bypass_ht_init() to pv paths

[Juergen Gross <jgross@xxxxxxxx>]

Commit 1f50ddb4f4189243c05926b842dc1a0332195f31 ("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@xxxxxxx>
Fixes: 1f50ddb4f4189243c05926b842dc1a0332195f31 ("x86/speculation: Handle HT 
correctly on AMD")
Cc: <stable@xxxxxxxxxxxxxxx>
Signed-off-by: Juergen Gross <jgross@xxxxxxxx>
Tested-by: Brian Woods <brian.woods@xxxxxxx>
---
 arch/x86/xen/smp_pv.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/arch/x86/xen/smp_pv.c b/arch/x86/xen/smp_pv.c
index 2e20ae2fa2d6..e3b18ad49889 100644
--- a/arch/x86/xen/smp_pv.c
+++ b/arch/x86/xen/smp_pv.c
@@ -32,6 +32,7 @@
 #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>
 
@@ -70,6 +71,8 @@ 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);
@@ -250,6 +253,8 @@ static void __init xen_pv_smp_prepare_cpus(unsigned int 
max_cpus)
        }
        set_cpu_sibling_map(0);
 
+       speculative_store_bypass_ht_init();
+
        xen_pmu_init(0);
 
        if (xen_smp_intr_init(0) || xen_smp_intr_init_pv(0))
-- 
2.13.7


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